(click on above thumbnails to enlarge photos)
warranty
VINTAGE
JENSEN STEREO SPEAKERS SYSTEM 300 Circa 1981-'85
Made in USA CURRENTLY HELD FROM SALE
for sale
A bit short in the looks department, but long on sound.
We have completely tested them with both recorded material,
PN 20-20k and swept them with our AF generator.
These Jensen "System 300" speakers are very
accurate and impressive sounding. Features:
- 9" woofer - 1" cloth soft dome tweeter
- Acoustic Suspension cabinet design - 8
Ω
Foam surround on 9" woofer in fine shape with years life left in it
before it will need to be replaced. Medium-dark Oak wood grain vinyl
wrap finish in decent shape with a few normal scuffs and dings. Nothing
too distracting from overall appearance (see photos). Original
brown grills in fair shape as well with normal amount of snags for 15
years old and unfortunately the small plastic Jensen badges are missing.
Grills also have minor, light colored staining on lower 1/3 of each.
Speakers test and sound great. Each measures 23" high x 13" wide x 10"
deep and weighs a 23 lbs unpacked. Includes our standard speaker
warranty ( excluding problems due to under / over powering). JENSEN SYSTEM 300 Condition 7.5
$239.
pair CURRENTLY HELD FROM SALE
(Above
text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING
5/9/19
(Click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED VINTAGE
MARANTZ
STEREO RECEIVER / CASSETTE TAPE
DECK MARANTZ 4025 'CASSEIVER' (aka MCR-425) AM/FM STEREO RECEIVER /
CASSETTE DECK
#...0181
Circa
1978-80
SOLD 7/30/19 SHIPPING TO TIM IN TENNESSEE
Our
technician has completely gone through and 'Certified' this unit.
ü We have completely gone through this unit cleaning everything
including all switches, controls and contacts. VERY time consuming to properly service this unit, especially the
8-track deck. Extensive cleaning of
unit internally.
ü Internal
fuses checked for continuity and correct values. No issues found,
fortunately. We don't like seeing incorrect fuses having been
installed in a unit as that could mean it had prior issues, or if a
fuse value was 'increased' it could have allowed too much current
through an 'ailing' circuit causing un-due / un-necessary damage.
ü
Controls were 'flooded' w/ 'De-OxId' and are quiet
ü Entire transport was disassembled down to the
chassis, and every mechanical part was cleaned of "varnished" lubes and
re-lubed as well as the always at issue, Pinch Roller plunge assembly,
re-lubed and reassembled (VERY DIFFICULT and TIME
CONSUMING on this unit)
ü
Main
drive belt has been replaced
with NEW for trouble free service (#42-1975 and
counter belt replace with #030).
ü
Capstan
flywheel removed, cleaned, burnished and re-lubed prior to re-install.
Entire transport and mechanism has been cleaned, re-lubed and
de-magnetized.
ü
Heads
have been cleaned and de-magnetized and are in great shape.
ü
Head alignment and
azimuth at 125Hz, 1kHz and 10kHz adjusted for BOTH directions for 'peak performance'
with O-Scope
and w/ STL and TEAC MTT-257H calibration / alignment
tapes.
Both channels now even output.
ü
Meters adjusted to even zero with symmetric
with Volt meter, O-Scope
and w/ STL and TEAC MTT-257H calibration / alignment
tapes.
Both channels now even output.
ü
Both
Internal playback amplifier channels adjusted
with Volt meter, O-Scope
and w/ STL and TEAC MTT-257H calibration / alignment
tapes.
Both channels now even output.
ü
Meters adjusted to even zero
with symmetric input
with Volt meter, O-Scope
and w/ STL and TEAC MTT-257H calibration / alignment
tapes.
Both channels now even output.
ü
Both
Internal Record amplifier channels adjusted
with Volt meter, O-Scope
and w/ STL and TEAC MTT-257H calibration / alignment
tapes.
Both channels now even output.
ü
Record
signal path contacts cleaned and burnished for static-free performance
ü
Linear
Record switch cleaned so no 'Motor Boating' effect
ü
Internal
playback, meter and record level pots also adjusted w/ O-scope.
ü
Following refurbishment, Speed checked with factory test tape to
100%
accuracy! (meaning in this case, that our 1000Hz test tape plays back at
1000Hz on our Freq Counter Meter)
ü
Deck
'sonically' checked for WOW and Flutter with no appreciable issues
ü
Record
Meters adjusted for 'even' readout and performance
ü
Pinch Roller replaced with new, as following initial transport
overhaul, we found that occasionally, on certain tapes the original
/ old pinch roller would 'crinkle / wrinkle' the tape
ü
Floor
noise of receiver tested @-60dBm.
Floor noise of cassette deck measured with 'blank' Fuji tape at
1.75mVAC.
ü
Tuner
string checked
for any fraying then re-tensioned to
increase traction & relieve flywheel binding and re-centered pointer
to correct dial position.
ü
We
aligned the tuner front-end for optimum AM & FM performance as older
internal tuner components have always drifted on vintage gear over
the years. VERY GOOD TUNER!
FM sounds fantastic. AM
is decent as well.
ü All
dial, indicator & meter lamps
work or were
replaced.
ü Stereo
indicator lamp working
ü We also
checked the heat sink compound which should be good for
another 30 years.
ü All
inputs tested and both side produces clean and even sine waves
into 'brick-wall'
8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent!
All functions test fine.
Total restoration time investment
16+ hours.
ü Following restoration procedures, the unit was run
continuously at medium volume, as all our amplifier / receivers are,
into a load with "Loudness" on and both Tone Controls at 10 for
72 hours into a 4 Ohm load.
ü On our test bench, each internal amplifier of this particular unit, #...0181,
produced peak power of
16 Volts
per channel for 28 Watts per channel @ 8 Ohm
and 13 Volts @ 4 Ohm for 42
Watts
per channel
@
1khz from actual discrete output transistors (2x
2SA1060 and 2x 2SC2484) (ALL the other 'compacts' we were working on
utilized STK power pack, which had some to do with why we couldn't
resurrect many of them. The DC was just too high in many cases, and
couldn't be rectified practically).
ü AC Idle current at
<.35A, & floor
noise-60dBm.
ü DC offset
checked to <30mVDC / channel (VERY good for a
'compact' unit and as good or better than many separate components).
____________________________
So, as with anything you want to look up on the 'world wide interweb',
you will find a myriad of opinions. Many of them are from folks who have
never even personally experienced what they are 'spouting off' about.
Well, of course, I have mine too, however, mine will be from someone who
does have 'personal experience' with whatever I'm 'expounding' about,
and is from 'real world' experiences, 'down in the trenches'. I often
get a 'kick' out of what folks have to say (generally negative) about a
piece of gear, with no actual, personal experience. Recently read so
many opinions of a speaker we had just finished and were about to
audition, prior to auditioning them, that I was not holding out much
hope for their final performance. Not only was I surprised by their
actual performance (in a positive way), they were completely the
antithesis of what EVERY opinion on the web stated, with NONE of them
ever actually hearing them (they all stated so in their opinions).
Anyway, I'll climb down from my 'ivory tower' for a moment just to say
that for what this is designed to be it really came out as a wonderful
unit following it's 18+ hours of service to bring it back to essentially
'new' condition.
Wonderful condition,
and for a 'compact system' REALLY GREAT SOUNDING,
late 70's, silver face
'Combo' Receiver from
Marantz.
We've had this for years, but just recently got around to restoring it.
We had a few 'compacts' from brands such as Sony, Panasonic, Fisher,
Marantz, but most did not pan out (didn't even attempt the 'cheeeeeese'
from companies like Electrophonic, GE, Lloyds, Sound Design, Symphonic and a host of
other 'bottom feeder' units.
It really is surprising in sonics, performance, feel and
quality. Great
performance for a 'small to mid-sized' 2-Channel audio system.
This is the only the second or third 'compact' to 'pass muster' in the past couple decades
(I think the last one was about 1998 or 99 and shipped to Germany and
then the Panasonic we recently posted as well). This is an INCREDIBLY ‘Musical’ sounding receiver.
Lot's of surprising 'punch' and volume.
Yes, I know, it's a 'compact' and not a 'separate
component', but it really is that nice!!! Enough power for up to
'medium-large' / 10" woofer speakers. Interestingly, this unit also has the most extensive 'spec listing'
of any unit we've ever posted, even over such units as a Pioneer
SX-1980 (not even considering that it's 2 units in one). And, the
specs are quite respectable in most aspects!
Marantz 4025 / MR425 Features:
Receiver
features: -
Weighted flywheel, analog, slide rule tuning - Separate Bass and Treble controls utilizing high quality de-tented pots -
Oversize volume control,utilizing high
quality de-tented pot - "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound. - FM Muting
(separate from 'Stereo / Mono' switch) - Stereo / Mono selector
(Separate from 'FM
Muting' switch) -
LED Stereo
Indicator - Hi filter for reducing tape hiss / electronic hiss & noise and
record static
- Phono / Turntable input with Built-In
Phono Pre-Amp -
Tape Input from built-in cassette deck (not for
signal processor insertion) -
Tape Output RCA jacks (Record Out / 'Pre-Volume',
Line Level output jacks for any Source) - Aux input (may
also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod®
/ iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® etc.)
- Microphone Input to tape
(be careful
with your speakers if using an 'open / live' mic with home-audio
speakers)
- A, B,
or A+B speaker selector -
Standard 1/4" Stereo Headphone jack
- Built-in,
internal AM ferrite antenna - Externally located
'Mains' protection fuses located on rear panel -
Un-switched convenience AC outlet
with 200 Watts capacity
Cassette Deck features: - Stereo Playback and Recording
- Super-Hard, 'Permalloy' PB / REC head
-
2-Position Tape Recording Bias selector
-
2-Position Tape EQ selector (for PB and REC)
- Dolby B
NR -
Dual Back-lit, analog,
Record Level VU level meters for Record and PB
levels - Separate L & R Input level controls
or 'Auto-Level' Limiter - Locking
Fast Forward and Re-Wind - 'Pause' function - Analog / Mechanical Tape Counter -
Standard / 1/4" microphone inputs mounted on the front
panel - Microphone Input - Rear mounted RCA I/O's
MARANTZ 4025 SPECIFICATIONS:
POWER / PRE AMP SPECIFICATIONS: THD;
0.1% @ full rated power @ 1kHz. Power
Frequency bandwidth of power amp section; 16-30,000Hz
Frequency bandwidth of
Pre-amp section; 18-24,000Hz
(measured at AUX) IMD utilizing AUX; 0.1%
@ full rated power / 20-20kHz and 8 Ohms Damping factor;
30 @ 8Ω full
bandwidth RMS rated Power: 2 x
25 Watts
@ 8 Ohms or 30 Watts @ 4 Ohms
Headphone Jack Load Impedance;
8 Ohms Hum and Noise; >80dB on AUX /
Tape Input Sensitivity AUX / Tape; 180mV
@ 20kΩ Channel Balance @ 0 to -40dB / 40-16kHz;
1.5dB ALL inputs
Inter-channel Crosstalk;
47dB (non-Phono)
Record Out Levels
/ Impedance; 500mV
/ 220 Ohms @ 1kHz Bass Control;
likely approx
±10dB @
10hz Treble Control; likely
approx
±10dB
@ 20khz High Filter; -10dB @
8kHz @ 12dB Oct!
"Loudness" Contour; likely
approx +8dB @
50hz, +3dB @
10khz (w/ volume set at -30dB)
TUNER SPECS FOR FM: Tuning Range;
87.4 - 109MHz
(a bit wider than most tuners!) Freq Response;
30-15kHz
(limited by FCC) S/N (Weighted); > 62db Stereo w/ 1mV input
Usable Sensitivity @ 40kHz Deviation & @ 98
Mhz: Mono; (1.7 uV)
Stereo; 60 uV)
Capture Ratio; 1.0dB
(approx) IF Rejection; >90dB
Alternate Channel Selectivity
@ 98mHz (±300kHz);
>65dB
Image Response Ratio: 50 dB Spurious Response
Rejection: 90 dB
AM Supression; 50dB
Pilot Signal & Subcarrier
Rejection: 19kHz =
58 dB & 38kHz = 58 dB
THD w/ 100% modulation Mono; 0.2%
THD w/ 100% modulation Stereo; 0.3%
Stereo Separation; >42dB
Channel Balance;
1.0dB
Output Voltage @ 1kHz; 600mV
Output Impedance @ 1kHz;
4.4k Ohms Ant Terminals;
Balanced 300 Ohms / Un-balanced 75 Ohms
TUNER SPECS FOR AM: Tuning Range; 525-1620kHz
(a bit wider than most tuners!)
Useable Sensitivity @ 26dB S/N, 30% Modulation
@ 1Mhz;
20 uV
with ferrite stick antenna Image Rejection
@ 1 Mhz; 41dB IF Rejection
@ 1 Mhz; 55dB Selectivity
@ 1 Mhz ± 9kHz: 20dB
Spurious Response Rejection
@ 1 Mhz:
38 dB
THD w/ 100% modulation Mono; 1.0%
Freq Response; 40-
~ 2.2kHz
S/N
@ 1 Mhz: > 43db
PHONO SECTION SPECS: Freq Response; RIAA Standard Curve +/-
2dB.
S/N; >72 dB Input Sensitivity;
2.7 mV @
47kΩ Overload
'Margin'; 31dB
Inter-channel Crosstalk;
45dB (Phono)
Cassette Deck Specifications:
Track format: 4
track / 2 channel Motors: 1x DC Servo Controlled
Tape Speed: 1
7/8 ips / 4.75 cm/sec
Heads: 2x;
RP Super-Hard Permalloy. Erase is Ferrite
Recording System: AC
Bias Erasing System: AC
Erase Meters: Standard
VU
Overall Frequency Response
(Dolby Off);
40-14kHz +/- ~3db w/
Ferric Oxide Tape @ -20dB
40-13.5kHz +/- 3db w/ CrO2 Tape @ -20dB 40-12.5kHz +/- 3db w/
'Normal' Tape @ -20dB
Harmonic Distortion / THD: 3.0%
w/
Ferric Oxide Tape @ -20dB 3.0%
w/
CrO2 Tape @ -20dB 2.2% w/ 'Normal' Tape @ -20dB Wow & Flutter (WRMS):
0.18%
wtd S/N ratio w/ CrO2 tape:
>52dB w/ Dolby
B OFF & >58dB w/ Dolby
B ON (over
5kHz and and High Bias Tapes)
Line
Input Level and Impedance ('Nominal'):
22dB @
20K Ohms Microphone
Input Level
and Impedance ('Nominal'): 72dB
@ 10K Ohms Line
Output Level and Impedance ('Nominal'):
500mV
@ 2K Ohms
Fast Wind Time:
~105 Seconds for C-60
tape
General Specifications:
AC / Mains Power Requirements;
120 VAC @ 60Hz Power consumption;
Idling Current 28Watts & 130 Watts
at rated Output both channels Semiconductor Complement:
Integrated Circuits; x7 Transistors; x61 Diodes; x43 Field Effect Transistors; x1 Weight: Stand alone; 28.6 lbs / 13.0 kgs & Originally packed; 33.0
lbs / 15.0 kgs
Again, we have done the previously stated refurbishment / restoration work
(~16+ hours) on this unit to insure its
performance, and it gets our full
'Certification'. All functions tested
for perfect operation. Overall,
it is in great cosmetic condition! Looks and sounds
great!
Measures 22.5" wide x
6.5" tall x 16.5"
deep and weighs
29 lbs unpacked. Includes our
standard 90 day
limited warranty.
Cond. 8.5
Marantz 4025 / MRC425 Stereo Receiver / "Casseiver"
SOLD 7/30/19 SHIPPING TO TIM IN TENNESSEE
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING 12/14/17
(click on above thumbnails to enlarge photos)
warranty
STEREO / QUADRAPHONIC
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE STEREO RECEIVER
SANSUI QUADRAPHONIC / 4-CHANNEL
/ 2-CHANNEL STEREO RECEIVER SANSUI QRX-7500 RECEIVER #...0232 Circa 1973-75
"WORLD
AC POWER"
™ M.I.J.
SOLD 1/4/19
SHIPPING TO ED IN FLORIDA
ü
Our technician has completely gone
through and 'Certified' this unit.
ü
We have completely gone through this unit cleaning everything
including all switches, controls and contacts. Extensive cleaning of
unit internally.
ü Internal
fuses checked for continuity and correct values. No issues found,
fortunately. We don't like seeing incorrect fuses having been
installed in a unit as that could mean it had prior issues, or if a
fuse value was 'increased' it could have allowed too much current
through an 'ailing' circuit causing un-due / un-necessary damage.
ü
Controls were 'flooded' w/ 'De-OxId' and are quiet
ü Tuner
string checked
for any fraying then re-tensioned to
increase traction & relieve flywheel binding and re-centered pointer
to correct dial position.
ü
We
aligned the tuner front-end for optimum AM & FM performance as older
internal tuner components have always drifted on vintage gear over
the years. VERY GOOD TUNER!
AM seems to be an 'afterthought' on many stereo
receivers and component tuners. The AM is above average for a
'stereo receiver' on this SANSUI QRX-7500.
ü All
dial, indicator & meter lamps
'proactively'
replaced for a TOTAL OF 26!!!
ü
We also
checked the heat sink compound which should be good for
another 30 years.
ü Amplifier
section had output bias adjusted to spec levels
of ~24.8mVDC on all four amplifiers.
ü
DC offset adjusted to VERY LOW levels on all four
amplifiers.
ü All
inputs tested and both side produces clean and even sine waves
into 'brick-wall'
8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent!
All functions test fine.
Total restoration time investment 15
hours.
ü Following restoration procedures, the unit was run
continuously at medium volume, as all our amplifier / receivers are,
into a load with "Loudness" on and both Tone Controls at 10 for
72 hours into a 4 Ohm load.
On
our test bench, this particular QRX-7500,
#...0232, 'FRONT'
amplifiers each produced 18
Volts per channel for
40 Watts per channel @ 8Ω via discrete output &
15 Volts per channel for
56 Watts per channel @ 4Ω
and
REAR' amplifiers each produced
11.5 Volts per
channel for 16+ Watts per channel @ 8Ω via
discrete output & 10 Volts per channel for
25 Watts per channel @ 4Ω
via discrete, Metal cased, TO-3 outputs.
(AC draw at idle .5A tested.
DC as follows
FR = -1.0 mVDC
FL = +1.0 mVDC
RR = +2.5 mVDC
RL = -2.5 mVDC
(Floor noise measured at >60dBm / 0.1mVAC)
___________________________
HUGE and VERY IMPRESSIVE looking, Sansui, brushed
silver, QUAD receiver, surrounded by handsome, real Walnut
wood veneer side plates. This unit has THE
highest 'KPD-Factor' of any we've had in a long time. What's a 'KPD
Factor'? 'Knobs per Dollar! You could also say it has very high 'MPD'
and 'LPD' factors as well (you should be able to figure those out
now). Features gorgeous, back-lit slide rule analog tuning scale
with matching VU meters as well. VERY elegant and IMPRESSIVE unit
when lit in a darkened room.
'Heavy' built, machined aluminum knobs and button caps, also make
this unit a pleasure to 'feel'. One of the most 'fun' receivers I've
used in a long time. Would love to abscond with this one myself.
Sansui QRX-7500 Features include:
- Quadraphonic (sometimes spelled
"quadriphonic" or "quadrophonic")
/ Stereo receiver
- Weighted flywheel analog tuning
- A, B, Off or A+B Front and Rear speaker positions
- Separate Front and Rear, Bass and Treble
controls
- Balance controls allow complete blending between Front and Rear /
Left and Right
- Built-in Hi and Sub filters (separately
switchable Front and Rear) for reducing 19kHz pilot tone in
FM broadcasts, Tape Hiss and the Sub filter for reducing turntable
rumble
- FM muting
- ''Function Control' selector for
2-Channel Stereo, & 4-Channel modes of ''QS
Synthesizer' (To convert (synthesize) conventional, 2-channel /
stereo program sources to 4-Channel stereo output), 'QS Regular
Matrix' (to decode and reproduce 4-channel program sources (records,
tapes and their respective broadcasts), ''Phase Matrix' (to
decode and reproduce 4-channel program sources, encoded with the CBS
/ SQ matrix system) or 'CD-4 /
Discrete' (when wishing to hear discrete
4-channel tapes or CD-4 (Quadradisc) records).
- Aux inputs for both Front and Rear (may also be used for Video /
CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® etc.)
- Dual tape monitors with Tape monitor A also featuring a DIN input
as well as the standard RCA I/O's for both Front and Rear
(Tape Monitors can be used with Tape decks such as Cassette Tape
Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks,
Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® /
iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as
for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special
Effects units, Time Delays, etc)
- Dual Phono / Turntable inputs with Built-In Phono Pre-Amp,
featuring 'Phono-2' compatible with 'CD-4' cartridges
- Loudness control for increasing 'rock-n-roll smile' tone curve at
lower volumes
- Front and Rear 1/4" stereo headphone jacks for
connection of either 'stereo' headphones, or 'quadraphonic /
4-channel' headphones
- Tuning
D’Arsonval
meters
for tuning and signal strength
- Quad VU meters for channel levels
-'CD-4' Level
adjustments located on front panel for Carrier Level, and L/R
Separation of Quad discs / records.
- Rear located, full barrier strip for external antenna connections
- Rear located main AC protection fuse
- Dual AC convenience outlets on rear
panel with 1 switched and 1 un-switched
for a total capacity of 250 Watts of
accessories
- True “WORLD AC POWER"™
as it will work on both 50 or 60 Hz AC and voltages from 110-240
Volts AC
Sansui QRX-7500 Original Specs:
POWER / PRE AMP SPECIFICATIONS:
THD;
0.3% @ full rated power @ 1kHz.
Freq Response of power amp section; 30-30kHz @
1W
Power bandwidth of power amp section; 10-30,000Hz
±0dB
IMD utilizing AUX;
0.3% @ full rated power / 20-20kHz
and 8 Ohms
Damping factor; 40 @ 8Ω full
bandwidth
Dynamic rated Power: 2 x 180 Watts
@ 8 Ohms or 260 Watts @ 4 Ohms
Cont rated Power:
4x 32 Watts @ 8 Ohms /
1kHz (BOTH channels driven)
4x 52 Watts @ 8 Ohms / 1kHz
(each channel driven)
4x 35 Watts @ 4
Ohms / 1kHz (each channel driven)
4x 28 Watts @ 8 Ohms / 1kHz
(ALL channels driven)
4x 25 Watts @ 4
Ohms / 1kHz (ALL channels driven)
Hum and Noise; >80dB on AUX /
Tape
Input Sensitivity AUX / Tape; 100mV
@ 50kΩ
Record Out
Levels; 100mV
Bass Control; ±12dB @
50hz (most amp tone
controls are only +/- 10dB)
Treble Control; ±12dB @ 15khz
(most amp tone controls are only +/- 10dB)
Low Filter; -10dB @
50Hz @ 6dB Oct
High Filter; -10dB @
10kHz @ 6dB Oct
"Loudness" Contour; +8dB @
50hz, +3dB @
10khz (w/ volume set at -30dB)
TUNER SPECS FOR FM:
Tuning Range; 88-108MHz
Freq Response; 30-15kHz
(limited by FCC)
S/N; > 65db Stereo w/ 1mV input
Mono Sensitivity; 1.9 μV
Capture Ratio; <2.0dB
IF Rejection; >90dB
Image Rejection;
>75dB
Spurious Noise Ratio; >80dB
Selectivity; >60dB
THD w/ 100% modulation Mono; 0.3%
THD w/ 100% modulation Stereo; 0.5%
Stereo Separation; >37dB
TUNER SPECS FOR AM:
Tuning Range; 535-1605kHz
Useable Sensitivity; 50db/m
with ferrite stick antenna
Image Rejection; >80dB
IF Rejection; >80dB
Selectivity; 25dB
PHONO SECTION SPECS:
Freq Response; 20-20kHz RIAA Standard Curve +/- 1dB.
S/N; >70 dB
Input Sensitivity; 2.5 mV @ 50kΩ
Overload limit; 150mV w/
0.5% THD @ 1kHz
CD-4 DEMODULATOR:
Input Sensitivity; 2.5mV
(adjustable 1 TO 10mV)
Input Impedance; 50kΩ
Freq Response (STD test signal);
Main Channel 30-15kHz,
Sub Channel 30-10kHz
Power consumption; 140 Watts
at rated
Again, as stated before, we have completely gone through this SANSUI
QRX-7500 Quad receiver, cleaning and testing all and it gets our
full
'Certification'. Everything is in fabulous electrical and
cosmetic condition! Looks near new and sounds great!
AMAZING looking when lit up at night or in a darkened room!
Again, this unit is a 'blast' to use. It just
simply 'feels nice'!
Comes with an 'e-copy / PDF
download of the SANSUI QRX-7500 owners / users
manual, and the service manual if the
purchaser desires. Measures 23.5"
wide x 8" tall x 14.5" deep and weighs an
impressive 55 lbs unpacked. Includes our
standard 90 day limited warranty.
SANSUI QRX-7500 STEREO RECEIVER
Cond. 8.5+++
SOLD 1/4/19
SHIPPING TO ED IN FLORIDA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|
|
|

NEW LISTING
11/30/11
(Click on above
thumbnails to enlarge photos)
warranty
NEW
AUDIO-TECHINCA STEREO HOME AUDIO / PRO
TURNTABLE MODEL AT-LP120USB DIRECT DRIVE
FULLY MANUAL RETURN WITH A GREAT
DIAMOND CARTRIDGE NOW INCLUDED NEW
for sale
One
of the few 'QUALITY' turntables available under a $GRAND these days! The
Audio-Technica AT-LP120 stereo turntable. Similar in design to some of the
vintage turntable models, such as the Kenwood KD-550 'concrete base', the Sony
PS-T1, and the Technics SL-1500, SL-1700MK2 or SL-D2 turntable models. This
professional stereo turntable features a high-torque, direct-drive motor for
quick start-ups yet is perfectly quiet. Classic 'S' shaped tone arm with
'universal' head-shell that allows mounting of most any 'quality', 1/2'
cartridge, either MM (moving magnet) or MC (moving coil). Tone-arm mounted in
high quality 4-point, Gimbol bearing. NEW UPDATE--- Now having the table shipped with a much better cartridge than
previously. It's now using one of our favorite 'all around' cartridge the
AT-95E, instead of the 'clunkier' AT-2N (that cartridge liked to track at an
incredibly heavy 3.5 Grams!!! Yuck...) Click
here for further info on the cartridge.
NEW UPDATE--- We're now including the Audio-Technica AT-95E, MM, Elliptically
cut diamond cartridge with tables purchased from us at Oak Tree Vintage.
Overall Table has good mass at over 20 lbs!
Features:
- Direct drive high-torque motor - Fully-Manual operation
- Selectable 33/45/78 RPM speeds (you will need to acquire a stylus / cartridge
designed for playing '78 RPM' records to utilize that feature to it's fullest)
- Professional weight cast aluminum platter with slip mat (no PLASTIC platters
here, unlike many of the NEW tables out there!) - ½-inch mount universal head shell
- Quartz Locked speed
or - Strobe monitored, adjustable platter speed - Adjustable tone-arm counter weight
- Adjustable 'Anti-Skating' control - 500,000 Silicon oil fluid hydraulic tone-arm cueing
- Internal Built-in Phono Pre-Amp of decent quality so if you MUST use this with
some sort of 'home-theater-surround-sound-5.1, 7.2, or 8.BR549 receiver' that
the manufacturer forgot to include the phono pre-amp on. If you have a 'REAL
receiver', ie, an old-school, vintage, 2-channel receiver or integrated amp or
pre-amp with a phono pre built-in, then you can flip a switch and bypass the
'built-in' phono preamp. - USB output—connects directly to your computer for plug-&-play use
- Forward or reverse play (this is a DJ feature, and if you value your vinyl or
cartridge, DON'T USE 'Reverse'! If you have a crappy cartridge and are playing
'Frisbees', then 'go for it' if you're so inclined! -
*Comes with Mac- and PC-compatible
Audacity software and cables to digitize your LPs If you appreciate the 'organic' sound of quality vinyl, then disregard the above
stuff 'USB / SOFTWARE STUFF' and just 'LISTEN' to your vinyl the way it was
meant.
SPECIFICATIONS:
Type: 3-speed, fully manual operation
Motor: High-Torque, 16 pole, DC motor Drive System: Direct drive
Speeds: 33-1/3, 45, & 78 RPM Pitch Variation: Adjustable in ranges of +/-10% or +/-20%
Turntable Platter: Die-cast aluminum Starting Torque: >1.6 kgf-cm
Braking System: Electronic brake Wow and Flutter: >0.2% WRMS (33 RPM)
Signal-to-Noise Ratio: >50 dB Output Level Pre-amp "PHONO":
2.5 mV nominal at 1 kHz, 5 cm/sec Pre-amp "LINE": 150
mV nominal at 1 kHz, 5 cm/sec
Phono Pre-Amp Gain: 36 dB nominal, RIAA equalized USB Function:
A/D, D/A- 16 bit 44.1 kHz or 48 kHz USB selectable Computer interface:
USB 1.1 Compliant Windows XP, Vista or MAC OSX Power Supply Requirements:
115/230V AC, 60/50 Hz
Includes :
Software included: Mac- and PC-compatible Audacity software
Accessories Included: 'Universal' Head shell w/ pre-mounted AT-95E 'Green' 1/2"
mount, Elliptically cut diamond tipped, MM cartridge, AC line cord, Included
cables connect to your stereo or powered speakers, ie: Dual RCA (female) to 3.5
mm (1/8") mini-plug (male) stereo adapter cable, Dual RCA (female) to 3.5 mm
(1/8") mini-plug (female) stereo adapter cable, 45 RPM adapter, USB cable &
above mentioned recording software (Adapter cables for standard analog RCA
inputs, as well as the 3.5mm TRS on computer sound cards.)
*System requirements (if you're planning on
using the table to transfer and burn your LP's / albums, records to CD
ROM or your computer hard drive or some other MP3 format): PC or Mac with an available USB port (USB1.1 or higher),
CD-R or CD-RW writer for burning CDs & installation, Includes Audacity software for PC & Mac users
(Audacity requires Mac running OS X 10.1 or later or PC running Windows (98 and
above))
Again, we are having these tables shipped with the much better sounding AT-95E
cartridge than the '3-GRAM TRACKING' AT-2N cartridge.
Comes with
the Audio-Technicas 1 Year limited
warranty handled through the AT. See Audio-Technica
AT-LP120USB turntable
owners manual or AT's web site for further details. Dimensions w 17.72" x d 13.86" x 6.1" H and weighs 23.5 lbs.
AUDIO-TECHNICA AT-LP120USB TURNTABLE Cond.- NEW
$349.99 and when purchased from Oak Tree Vintage also includes
*AT-95E CARTRIDGE!
w/ MM, Elliptically Cut Diamond stylus cartridge, Dust Cover and all above
mentioned cables and software.
*Turntable
shipped directly from AT and the Cartridge will be shipped from us at Oak Tree Enterprises,
LLC. Once products arrive, please call us for assistance with re-balancing tone
arm and setting the 'Anti-Skate' adjustment.
(OK, do I really need to say it?... No,
the laptop shown in the photos is NOT included.)
|

NEW LISTING 9/4/12
(Click on above thumbnails to enlarge photos)
warranty
NEW AUDIO-TECHINCA PROFESSIONAL / DJ / SOUND SYSTEM / CLUB STEREO TURNTABLE AT-LP1240USB DIRECT DRIVE QUARTZ LOCKED OR MANUAL SPEED CONTROL FULLY MANUAL W/ 'REVERSE' PLAY
AND WHEN PURCHASED FROM OAK TREE
VINTAGE WITH A NEW, DIAMOND CARTRIDGE
NOW INCLUDED NEW
for sale
Professional DJ / Club table. Quality tool for the 'long haul'! The
Audio-Technica AT-LP1240-USB DJ turntable. Similar in design to some of the
vintage turntable models, such as the Kenwood KD-550 'concrete base', the Sony
PS-T1, and the Technics SL-1500, SL-1700MK2 or SL-D2 turntable models. This
professional stereo turntable features a super high-torque, direct-drive motor
for quick start-ups yet is perfectly quiet. Classic 'S' shaped tone arm with
'universal' head-shell that allows mounting of most any 'quality', 1/2'
cartridge, either MM (moving magnet) or MC (moving coil). Tone-arm mounted in
high quality 4-point, Gimbol bearing.
The AT-LP1240-USB plays back 33-1/3, 45 and 78 RPM records
(78 is selected by
pressing both 'speed' select buttons simultaneously). Its built-in phono
preamp enables the turntable to be connected to a wide variety of music and home
entertainment systems, powered speakers, and to A/V receivers that do not
include a dedicated phono input (de-featable for 'old schooool' and 'REAL'
receivers and integrated amplifiers that 'DO' have a built-in phono pre-amp. The
turntable includes PC- and Mac-compatible Audacity® software that converts the
audio on a record to MP3, WAV or other format digital audio files.
NEW UPDATE--- We're now including the Audio-Technica AT-95E, MM, Elliptically
cut diamond cartridge with tables purchased from us at Oak Tree Vintage.
Table has great mass at almost 30 lbs!
Professional features for DJ use in nightclubs, touring & mobile applications:
- Direct drive high-torque motor - Quartz Locked Speed Control System or 'Manual' Strobe Speed controls
*- Adjustable Braking Rate (0.2 – 6.0 seconds)
*- Adjustable Starting Rate (0.2 – 6.0 seconds)
*- Dual Platter / Motor 'Start' / 'Stop' controls
- Fully-Manual operation - Selectable 33/45/78 RPM speeds
(you will need to acquire a stylus /
cartridge designed for playing '78 RPM' records to utilize that feature to it's
fullest) - Professional weight cast aluminum platter with slip mat (no PLASTIC platters
here, unlike many of the NEW tables out there!) - Classic 'S' style tone-arm
- High quality 4-point Gimbol bearing - ½-inch mount universal head shell
- Strobe monitored, adjustable platter speed - Fluid damped tone arm cuing
- Adjustable tone-arm counter weight - Adjustable 'Anti-Skating' control
*- Adjustable Tone-Arm bearing height *- 45 puck storage pin
- Internal Built-in Phono Pre-Amp of decent quality so if you MUST use this with
some sort of 'home-theater-surround-sound-5.1, 7.2, or 8.BR549 receiver' that
the manufacturer forgot to include the phono pre-amp on. If you have a 'REAL
receiver', ie, an old-school, vintage, 2-channel receiver or integrated amp or
pre-amp with a phono pre built-in, then you can flip a switch and bypass the
'built-in' phono preamp. - USB output—connects directly to your computer for plug-&-play use
- Forward or reverse play (this is a DJ feature, and if you value your vinyl or
cartridge, DON'T USE 'Reverse'! If you have a crappy cartridge and are playing
'Frisbees', then 'go for it' if you're so inclined! -
*Comes with Mac- and PC-compatible
Audacity software and cables to digitize your LPs If you appreciate the 'organic' sound of quality vinyl, then disregard the above
stuff 'USB / SOFTWARE STUFF' and just 'LISTEN' to your vinyl the way it was
meant.
SPECIFICATIONS:
Type: 3-speed, fully manual operation Motor: High-Torque, 16-pole, 3-phase, brushless DC motor Drive System:
Direct drive Speeds: 33-1/3, 45, & 78 RPM Pitch Variation: +/-10%
Turntable Platter: 332mm, Die-cast aluminum Starting Torque: >4.5 kgf-cm
Braking System: Electronic brake Wow and Flutter: > 0.1% WRMS (JIS WTD) with 33 RPM Tone-arm type: Static balanced, Classic 'S' shape, universal head shell Effective Arm Length: 230mm Overhang: 15mm Height of tone arm adjustment range:
0-6 mm Tracking Error: > 3 degrees Applicable cartridge weight Without head shell: 3.5- 8.5 g Anti-skating range:
0-3 g Signal-to-Noise Ratio: >55 dB DIN-B Output Level Pre-amp "PHONO":
2.5 mV nominal at 1 kHz, 5 cm/sec Pre-amp "LINE": 150
mV nominal at 1 kHz, 5 cm/sec
Phono Pre-Amp Gain: 36 dB nominal, RIAA equalized RIAA 20-20kHz, +1/-3dB (In: 1.5mV 1kHz) USB Function:
A/D, D/A- 16 bit 44.1 kHz or 48 kHz USB selectable Computer interface:
USB function A/D, D/A 16 bit 44.1
kHz or 48 kHz USB selectable Computer interface USB 1.1 Compliant Windows XP or above or MAC OSX or above Power Supply Requirements:
115V AC, 60 Hz
Includes :
Software included: Mac- and PC-compatible Audacity software
Accessories Included: 'Universal' Head shell,
Slip mat: dust cover: platter: 45 RPM adapter:
counterweight: head shell: power cord: USB cable: dual RCA (female) to 1/8" (3.5
mm) mini-plug (male) stereo adapter cable: dual RCA (female) to 1/8" (3.5 mm)
mini-plug (female) stereo adapter cable: dual RCA (male) cable with integrated
ground wire: stylus target light: Audacity software (CD)
*System requirements (if you're planning on
using the table to transfer and burn your LP's / albums, records to CD ROM
or your computer hard drive or some other MP3 format): PC or Mac with an available USB port (USB1.1 or higher), CD-R or CD-RW writer
for burning CDs & installation. Includes Audacity software for PC & Mac users
(Audacity requires Mac running OS X 10.1 or later or PC running Windows (98 and
above))
(Refer to included software guide (also
available online at www.audio-technica.com) before connecting the turntable to
your computer.)
Comes with
the Audio-Technicas' 1 Year limited
warranty handled through the AT.
See Audio-Technica
AT-LP1240USB turntable
owners manual or AT's web site for further details. Dimensions w 17.72" x d 13.9" x 6.6" H and weighs a
HEAVY
28 lbs. AUDIO-TECHNICA AT-LP1240USB TURNTABLE Cond.- NEW
$529.99 and when purchased from Oak Tree Vintage also includes
*AT-95E CARTRIDGE!
*Turntable
shipped directly from AT and the Cartridge will be shipped from us at Oak Tree Enterprises,
LLC. Once products arrive, please call us for assistance with re-balancing tone
arm and setting the 'Anti-Skate' adjustment.
*
Denotes change / addition from previous model
|


NEW ADDITION
8/27/19
(Click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE STEREO RECEIVER
SANSUI 2000X STEREO RECEIVER
140 WATT RATED DYNAMIC POWER
#...0852
Circa '73-76
"WORLD
AC POWER" ™
MIJ
SOLD 9/11/19
SHIPPING TO LYN IN CALIFORNIA
ü Our
technician has completely gone through and 'Certified' this unit.
ü Everything
was cleaned inside and out including all contacts, switches,
controls and I/O jacks.
ü Control
Pot shafts re-sprung.
ü Internal
and external fuses checked and replaced where necessary.
ü All
4 power transistors removed and tested for leakage.
ü Re-flowed
multiple solder joints
ü We
also aligned the tuner front end for
optimum AM & FM performance as older internal tuner components have
always drifted on vintage gear over the years.
ü We
re- aligned the tuner
dial indicator for improved accuracy
ü All
meter, dial, and FM stereo lamps replaced for trouble-free service
(very difficult to do on this series of receiver).
6x #40 & 4x #25-130 bulbs / lamps.
ü Tuner
string re-tensioned for improved flywheel 'grip'
ü Amplifier
section had output bias and DC offset adjusted to spec levels
ü Repaired
'open' coil on tuning meter
ü Entire
unit cleaned / detailed cosmetically inside and out, including a
fresh coat of lemon oil rubbed into the Real Walnut wood veneer
cabinet, while chassis was removed.
ü All
inputs have been tested and both side produces clean and even sine
waves into static 8 & 4 Ohm loads! No power supply hum of any kind.
It's dead silent! All functions test fine.
ü Following
our restoration procedures, the unit was run continuously at medium
volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours and into a 4
Ohm Load! You will not be disappointed. Total restoration / ‘tech
time’ investment ~13 hours.
ü On
our test bench, both this unit's amplifiers, #...1204 produced peak
power of 18 Volts per channel @ 8 Ohms for
40 Watts and 15 Volts @ 4 Ohms for 56
Watts per channel via discrete, TO-3, metal cased outputs with 1 kHz
input. (4x Toshiba 2SC793, (same as Sanken 2SC1111)).
ü Idle
current draw measured at 0.2A.
Bias adjusted to spec of 20mA. (which by
the way, once biased, brought the idle temperature of the heat-sink
down from ~220F degrees to ~68°F)
ü DC
offset adjusted to <15mVDC L & R unloaded and ZERO mV loaded (from
the 75mVDC exhibited initially).
ü Floor
noise measured at -60dBm AC w/ AUX
shunted).
____________________________
This receiver is from what many consider to be one of
Sansui's best eras. The Sansui 2000X stereo receiver. The "X" suffix
designates upgraded F-6013 driver boards that are sought after by
owners of "non-X" units as an aftermarket upgrade. We have had a few
'X000' series Sansui units and they are among some of the best
sounding, 'vintage', 'main stream' amplifiers we have heard. Lots of
headroom and punch! Similar in sound to many of the NAD amplifiers /
receivers we sold back in the 80's. This one also is installed in
the optional, REAL walnut wood veneer case that's
in beautiful condition as well.
Sansui 2000X Features include:
§
Weighted flywheel, 'slide rule' style analog tuning
§
Dual
Tuning Capacitors. One for FM and one for AM. Allows for incredibly
'quiet' tuning
§
Speaker Damping Selector
§
A, B, A+B, Off, speaker positions
§
Separate Left and Right, Bass and Treble w/ 'concentric' controls
§
Hi-Filter for reducing tape hiss / electronic hiss
& noise and record
static
§
Built-in Subsonic Filter to eliminate excess rumble from sources
such as turntables
§
Pre-Amp Out / Power-Amp In Loop (unique to the "X" version)
§
'TRUE' tape monitor featuring both RCA and DIN I/O's (Tape Monitors
can be used with Tape decks such as Cassette Tape Recorders/
Players, Reel to Reel's, 8Track Tape Cartridge Decks, Video / CD /
DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-Gadget
/ MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting
signal processors, such as EQ's, Reverbs, Spatial Enhancers /
Dynamic Processors, Noise Reduction units, Special Effects units,
Time Delays, etc)
§
Aux
inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPad® / iPhone® / iTouch® / i-Gadget / MP3 / XM® / SIRUS®
etc.)
§
Tape
B to Tape A Dubbing capability
§
Dual
Phono / Turntable inputs with Built-In Phono Pre-Amps
§
"Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
§
Stereo / Mono selector for Pre-Amp separate from the FM tuner
selector
§
Pre-Amp Stereo / Mono selector
§
Stereo Reverse selector (great for troubleshooting speakers)
§
FM Muting separate from the Stereo / Mono selector
§
FM MPX filter (removes the 19kHz pilot signal from FM broadcasts)
§
Rear located MPX Separation & Level adjustments
§
FM
Dist / Loc selector
§
Front mounted 1/4" stereo headphone jack
§
Tuning window features VU meter for tuning signal strength
§
Rear located speaker and main power protection fuses
§
Vertically finned heat sinks for very efficient cooling and long
life
§
Built-In Ferrite 'Stick' AM antenna
§
True
"WORLD
AC POWER"™
allows unit to be operated on 50 or 60 Hz AC and will select
voltages from 110v, 120v, 220v and 240 Volts AC input.
§
Dual AC convenience outlets on rear panel with 1 switched and 1
un-switched
Sansui 2000X
SPECIFICATIONS:
POWER
/ PRE AMP SPECIFICATIONS:
Music Power: 140 Watts dynamic @ 4 Ohms
100 Watts dynamic @ 8 Ohms
Cont rated RMS Power: 2 x 52 Watts @ 4 Ohms, 20-20k & <0.8%
THD
THD; 0.8% @ full rated power
IMD; 0.8% @ full rated power
Power Bandwidth (IHF); 20Hz-40kHz
Damping factor; 24 @ 8Ω & full bandwidth
Hum and Noise; 70dB on Phono w/ 2.5mV input and 80dB w/
5.0mV input
Input Sensitivity AUX / Tape; 150mV @ 100kΩ
Bass Control; ±12dB @ 50hz
Treble Control; ±12dB @ 10khz
High Filter; -10dB @ 10kHz
Low Filter; -10dB @ 50Hz
"Loudness" Contour; +8dB @ 50hz & +3dB @ 10kHz (volume
control @ -30dB)
TUNER SPECS FOR FM:
Tuning Range; 88-108mHz
Freq Response; 30-15kHz
Capture Ratio; 1.0dB
S/N; > 60db Stereo
20dB Quieting Sensitivity Mono; 1.4μV
FM Alternate Channel Selectivity; > 40dB
Spurious Radiation; <34dB
Spurious Response Rejection; >90dB
Image Rejection Ratio; >90dB
THD 65dBf @ 1kHz, Mono; <0.8%
Stereo Separation Ratio: >35dB @ 50Hz to 10kHz
TUNER SPECS FOR AM:
Tuning Range; 535-1605kHz
Image Frequency Rejection; >50dB @ 1kHz
IF Rejection; >80dB @ 1kHz
Useable Sensitivity; 100μV / m @ 1kHz with ferrite stick
antenna
Selectivity; >20dB @ 1kHz
PHONO SECTION SPECS:
Freq Response; 20-20kHz
THD; 0.8% @ 200 mV @ 1kHz
Input Sensitivity; 2.5 mV @ 50kΩ on 'Phono-1' & 2.5 mV @
100kΩ on 'Phono-2'
Max input; ~200 mV @ 50kΩ
Again, we have completely gone through this unit. This is the first
Sansui 2000X we have refurbished in a few years. Brushed aluminum
face and knobs in like NEW condition. Unit looks and sounds great!
Originally 'Optional', but now included, Real Walnut wood, veneer
case in decent condition, also in NEAR NEW
condition with only the most minor of visible wear.
Again, these are known for their exceptional
tuner quality on both AM and FM and their VERY PUNCHY sounding
amplifiers. Very 'Musical' sounding stereo receiver. Measures 18"
wide x 14" deep x 6.5" deep and weighs a whopping 34 lbs unpacked.
Comes with
standard 90 day limited warranty.
SANSUI 2000X STEREO RECEIVER
Cond. 8.5++
SOLD 9/11/19
SHIPPING TO LYN IN CALIFORNIA
(Cons. M.H.)
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|


NEW LISTING 5/21/18
(click on above thumbnails to enlarge photos)
warranty CLASSIC STEREO
SPEAKERS JBL L100 'CENTURY'
#...1011A / 9060A Circa mid 1971-77 MADE IN USA
SOLD 5/23/19
SHIPPING TO STEPHEN IN COLORADO
One
of the top 'Classics' and one of the most sought after speaker models ever
made. The JBL L100 ‘Century’ speakers. It's hard to expand on what's already
been written out there about these speakers. Most fans of these know some
version of the JBL L100 story or link to an appreciation web site. They have
been one of my favorites for some years now, and I finally just finished a
pair for myself to keep as well. They are capable of high volume levels
while producing "pounding" & "tight" bass with great balance on the top and
mid end. Just a great 'all-around' speaker for home audio listening or
recording ‘studio monitor’ use. Just as happy with a medium-small size amp
as they are with amps of larger size (probably not efficient enough to enjoy
with a small wattage, under 25 Watts or single ended tube amp).
Our
speaker tech has completely gone through and 'certified' these. Tweeter
diffusion foam replaced. All drivers were removed and reinstalled into
cabinet with ‘added’ gasketing material under their frames to further reduce
any possibilities of vibration or acoustic anomalies. 'High' and 'Mid' Attenuators
checked for
functionality
(these attenuators have wipers that go 'a bit too far', thus go past
their coils at 100% rotation, so for 100% signal, adjust to extreme
'clockwise', then back them off 1-2mm). The tweeters have new
dispersion foam installed. Grill front frames
re-covered and look fabulous (while not shown in the above photos, the "JBL"
logo badges are intact on the frames).
Next, as always they were tested
with both recorded material, PN 20-20k and swept them with our AF generator
from 20-3kHz. Then came our standard, 'abusive' test recordings.
The
only cosmetic issue worth mentioning, is that the top of one cabinet
appears to have been re-veneered, and does not match the cosmetics
of the other cabinet (see photos above & reflected in the price).
Other than that the front corners and edges are all nice and crisp
with virtually no wear.
Cabinets were
finished off with a coat of ‘Lemon
Oil’ and then
hand-rubbed with ‘Feed-n-Wax’.
They look GREAT! Following the above work, these speakers are ready to go! We auditioned this pair well. Following the above mentioned 'barrage', our
demo cuts ran the gamut from Dire Straits, 'Brothers in Arms', TLC 'Fan
Mail', Allison Kraus and Union Station, Nickelback, and a few others,
all digitally recorded and some 'DDD'. 'Solid', punchy and 'tight' low-end, with no 'mush'. Overall, Great 'tone'
quality, but then again, they're one of the most famous and sought after
speaker models ever made. Heck, most of the above cuts may have been originally mixed on a pair of
these. From an original JBL
brochure from ’73,
“The JBL L100, is the most successful speaker ever produced by JBL. It may
well be the most successful loud speaker in its class ever produced by
anyone.”
“The JBL L100 is essentially the JBL 4310 studio monitor in a more
‘handsome cabinet’ and was the most ‘expensive bookshelf speaker’ in it’s
time.” JBL L100
Century FEATURES: - 3-Way, Bass Reflex cabinet design - 12" / 30cm, JBL 123-A, Die-Cast-aluminum framed, "Ribbed", cone woofer,
coated with ‘Lansaplas’, an ‘anti-resonance’ material to reduce radial ‘eddy
currents’ (reason for the ‘white’ color), w/ 3”, ‘Edge-wound’ copper ribbon
Voice Coil, surrounded by a powerful 6.75 lb ‘AlNiCo V’ magnet. - 5"JBL LE5 Midrange Die-Cast-aluminum framed, Non-deteriorating paper
surround, 7/8” VC and 2.75 lb, AlNiCo magnet - 1.4" JBL LE25 Tweeter, Die-Cast-aluminum framed, w/ 5/8” copper wound VC &
Non-deteriorating paper surround Cone-Tweeter - "Real" internal 3-Way cross-over - Hi and Mid attenuators on front panel for custom tailoring sound to your
tastes and listening room - 2.75" tuned port for extending bass response - Real wood Walnut Veneer Finish on well built, heavy wall cabinet - Speaker input connectors have been upgraded from the historically anemic
JBL connectors used during that era, to heavy duty, 3-Way, binding posts
JBL L100
CENTURY SPECIFICATIONS / SPECS:
Frequency
Response:
Not Specified on most JBL’s
Efficiency:
~85 dB 1W@ 1m
Nominal
Impedance:
8Ω each
Cross-over frequencies: @ 1.5k & 6kHz Continuous / Max power rating: 50 continuous to clean peaks of ten
fold
The JBL L100 ‘Centurys’ are from what most folks (including us) would argue
was JBL’s 'Pinnacle' period, and were offered in the same line-up that gave
us the such great JBL models such as the JBL L26 & L36 ‘Decade’ series
speakers, the JBL L300A ‘Summit’ speakers, the JBL L65 ‘Jubal’s’, the JBL
L166 ‘Horizon’ speakers, The monstrous JBL Paragon D44000 speakers and of
course the industry standard, JBL 4310, 4311 4311B & 4312 studio monitors.
Again, we have completely tested all drivers at individually applicable
frequencies with a sweep generator looking for any irregular anomalies in
either the drivers or cabinet structure integrity. HUGE in SONICS! These are one of the most incredible sounding speakers you
will hear. These have most everything we look for in a home audio speaker
such as 'balance', detail, power handling, accuracy, punch and 'largeness of
sound'. These are in excellent condition as well. Plenty of top end that can
be filtered / tailored to your tastes with built-in attenuators. Huge, DEEP
low-end that still stays incredibly tight (shakes the concrete floor in our
demo room). They are able to handle "power" MUCH better than your average
speaker. Not simply referring to they're wattage rating, but just the way
the perform at higher power / volume levels without "falling apart"
sonically. We 'stood' on them HARD with our test Hafler power amp. JBL
L100’s are always among the top performers of the many speakers we have
auditioned over the years. Also, again, these look great having the above mentioned work. JBL L100’s
are one of our favorite speakers and for 98% of folks out there, probably
one of the most ‘listenable’ speaker you will own for ‘all-around’ music
genres and power applications. If you are looking for a great performing pair of JBL L100’s, sonically as
well as cosmetically, then here you go! Comes with a link to an ‘e-copy’ of
the original ’73 brochure. Each measures 23.5" h x 14.25" w x 13.75" d and
weighs 52 lbs unpacked. Includes our 90 day warranty (excluding problems due
to under / over powering) JBL L100 'Century' SPEAKERS Condition 8.5
(only due to 'top veneer mismatch')
with grills
(Cons.)
M.R.
SOLD 5/23/19
SHIPPING TO STEPHEN IN COLORADO
(Above
text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING 11/2018
(click
on above thumbnails to enlarge photos)
warranty
VINTAGE KENWOOD SPEAKERS
KENWOOD KL-777X
15" WOOFER / 3-WAY / 4-DRIVER
200 WATTS
WITH TWEETER / MID PROTECTION ADDED
#...0829/0904
Circa 1979-81
Made in Japan
SOLD 12/20/19
SHIPPING TO DAN IN CALIFORNIA
Classic lattice grill, vintage & large Kenwood
KL-777X stereo speakers. 3-Way,
4-Driver, Bass Reflex cabinet design. These are VERY
efficient speakers with above average tone balance for late '70's
speakers. Plenty of top end that can be filtered / tailored to your
tastes with built-in attenuator or external EQ / tone control. Also
HUGE & tight low end, likely due to the ported and very 'tuned'
cabinet design. They also seem to be able to handle "power" better
than your average speaker. Not simply referring to they're wattage
rating, but just the way the perform at higher power / volume levels
without "falling apart" sonically.
Our speaker tech has completely gone through and 'Certified' these.
- All drivers were removed and tested
individually.
- Attenuators / L-pads cleaned for
'intermittent free' performance.
- Poly-Spun batting added to existing
damping material to 'tighten up bass response' and reduce cabinet
'ring'.
- We were originally prepping these speakers for
a commercial application (Micro-Brewery) so for more 'trouble-free'
durability, we added #1156 bulbs as 'shock absorbers' to the
tweeters and midranges (as we commonly do for 'commercial
applications' or where there's a chance a speaker may be subjected
to more stringent duty cycles).
(This particular chain of 'mid-western' micro-brews have purchased
dozens of pairs of speaker from us over the past 5 years, actually
consuming most of the 'lattice grill' units that have come in to us.
These were a in a batch that we did for their last location, that
were not needed in the end, as that install had more than enough)
- Gasket / sealant material was added to
all driver mounting flanges, prior to re-installation to reduce any
possibilities of vibration or acoustic anomalies.
Cosmetically, cabinets were cleaned & the wood grain, vinyl wrapped
cabinets are in decent shape with typical nicks and scuffs.
One of the Poly molded grills
has some 'chunks / chips' out of one corner, but
other than than, both are in good 'structural' shape
(see photos above). Felt feet were installed to the cabinet
bottom plates.
Next, as always, they were tested with both recorded material, PN
20-20k and swept them with our AF generator from 1Hz-3kHz.
Then came our standard, 'issue exposing' and on some levels,
'abusive' test recordings. These speakers are ready to go!
We auditioned this pair extensively and 'THEY DELIVERED' as
expected, but additionally adding the 'gasketing' really 'tightened'
up the cabinets and cleaned up the bass response. The 'bass' is not
only solid and tight on these speakers, but goes VERY DEEP.
Our demo cuts included the following; Dire Straits' "So
Far Away" from their album 'Brothers in Arms' album,
Donald Fagens, "I.G.Y." from the album "Night Fly"
(solid / snappy reproduction), '24K Gold Edition of Jennifer
Waren's "Famous Blue Raincoat' (the saxophone was a bit
bright, but not offensive, smooth),
TLC's "Scrub" from their album 'Fan Mail' (did 'sub-bass'
note @ 1'25" & 1'35" decently,
Allison Kraus and Union Station's "Baby, Now That I've Found You"
(upfront and natural),
Cowboy Junkies ‘Sweet Jane’ (VERY open’),
Don Williams' DDD version of 'Country Boy' (good, 3-D
soundstage),
Calvin Hampton's, "The Wedding March" from "Digital Pipes,
The Splendor of the Organ", a digital recording of a cathedral pipe
organ (open and HUGE!),
Trapt’s “Headstrong” (was ‘solid’ and the woofers exhibited no
sign of fatigue even at upper power levels)
Just about anything from "KORN" ROCKED!!!
Most of the cuts from Michael Jacksons' 'Number Ones' such as
"Bad" "Beat It", and "Billy Jean", were
‘strongly’ reproduced and VERY solid,
Van Halens' cut "Drop Dead Legs" from the CD "1984"
ROCKED!
Nickel Creeks’ “When in Rome” from their CD "Why Must the
Fire Die?" (was a BIG, open and up-front),
and a few others, all digitally recorded and some 'DDD'.
Incredible power handling characteristics for a speaker this size.
They are able to handle "power" better MUCH than your average
speaker. Not simply referring to their wattage rating, but just the
way they perform at higher power / volume levels without "falling
apart" sonically. We 'stood' on them HARD with our test Hafler 500
Watt power amplifier. 'Solid', punchy and
'tight' low-end, with no 'mush'.
We auditioned this pair extensively and 'THEY DELIVERED' as
expected, but additionally adding the 'gasketing' really 'tightened'
up the cabinets and cleaned up the bass response.
Great sounding speaker for that classic 70's stereo receiver or
amplifier!
We have completely tested them with both recorded material, PN and
swept them with our AF generator.
Kenwood KL-777X Features:
- 15"
Non-deteriorating Cloth surround Woofer
- 6.25" x 2" Exponential-Horn / Upper
Midrange
- 2x 2.5" Tweeters
- "Real" internal cross-over, not just a
couple of "caps" on the mids and tweets
- 3-position Hi frequency attenuators, using resistors, not failure
prone Ni-Chrome wire, for custom tailoring sound to your tastes and
listening room
- Dual 2" Tuned ports for extended low end
Kenwood KL-777X Specifications:
Enclosure Type:
Bass Reflex / Tuned-Ported
Frequency Response: ~20-21,000Hz
+- 3dB
Efficiency: ~96dB 1w @ 1m
Nominal Impedance: 8Ω
Cross-over frequencies: 2kHz
and 8kHz
Recommended Nominal Power Amplifier range: 10-250
Watts
Recommended Power Rating: 100
Watts
Recommended MAX Power rating: 200
Watts
Very nice looking wood grain, vinyl wrap cabinets with only a few,
minor 'battle scars'. Again, as stated above, both Poly molded
grills in fair shape as
one has the 'chips / chunk' from the top corner (see photos
above).
All drivers are in perfect condition, work and sound fine! Tested
for all frequencies with a sweep generator.
Speakers look fine (except for the above mentioned grill issue) and
sound GREAT! Huge, accurate and loud sound, but also very efficient
at lower powers due to their 96dB rating!
If you're looking for a great performing speaker at medium to higher
volume
applications, you will not be disappointed with these speakers. Each
measures
25.75" H X 23" W X 10.5" D
and weighs 37 lbs unpacked. Includes our
standard 90 day limited speaker warranty (&
excluding problems due to under / over powering)
KENWOOD KL 777X
Cond. 8 (due to scuffs / grill chip)
with grills
SOLD 12/20/19
SHIPPING TO DAN IN CALIFORNIA
(Cons.)
C.B.S.
(Above
text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See
'Copyright Information' page for details)
|
NEW LISTING 11/2018
(click on above thumbnails to enlarge photos)
warranty
VINTAGE
RECTILINEAR III "TALL BOYS"
STEREO SPEAKERS
#...7942 / 7982
Circa 1968-73
MADE IN THE USA!
SOLD 5/5/19
SHIPPING TO FRANK IN CONNECTICUT
Our speaker tech has completely gone through and 'Certified' these.
We have completely tested all drivers. Original mids'
were 'questionable' on the 'audio sweep' so the Midrange's were replaced
with a pair of 'originals' we had 'rat-holed' here at Oak Tree Vintage.
All drivers were removed and reinstalled into cabinet with ‘added’
gasketing material under their frames to further reduce any
possibilities of vibration or acoustic anomalies. Both Mid and Top End
attenuators had their contacts burnished and were cleaned internally.
Next, as always they were tested with both recorded material, PN 20-20k
and swept them with our AF generator from 20-10kHz. Then came our
standard, 'abusive' test recordings. We also
converted the grills from a 'nailed on' attachment to Velcro and added
'pull-tabs' to facilitate removal (commonly
if someone has tried to remove the grills from Rectilinear 'Hi-Boys',
the masonite frames will be broken / cracked from being pulled away from
the baffle board nails. These were expertly removed, thus are completely
intact and un-broken). These speakers are ready to go!
Rectilinear 'III Tall Boys' features include:
- 4-way, 6-Driver, Bass Reflex speaker design
-12" Low Frequency Driver (woofer) (Jensen)
- 5" 'Philips" Midrange w/ 'whizzer cone' & w/ AlNiCo magnets
- 2x 2.5" 'Danish made Peerless' Tweeters w/ AlNiCo magnets
- 2x 2" 'Danish made Peerless' Tweeters w/ AlNiCo magnets
- 2" Tuned port for extended bass response
- Dual Attenuators
Rectilinear 'III Tall Boys' Original
Specifications:
Frequency Response: 22-18,500Hz +- 3dB
Nominal Impedance: 8Ω
Cross-over frequencies: @ 500Hz, 3kHz & 11kHz
Recommended Power amplifier rating: 20-100 watts
From a 1967 Stereo Review Julian Hirsh had this to say about the
Rectilinear III, "Over
a period of several months, we have had the opportunity to compare it
with a number of other speakers that can 'outpoint' the Rectilinear III
on any "individual" characteristic-frequency range, smoothness,
distortion, efficiency, dispersion or transient response. However, none
of the speakers combine ALL of these properties in such desirable
proportions as the Rectilinear III",
and in a 1972 Stereo Review, he had this to say about the Rectilinear
III,
"...the two samples we have tested are among the best-sounding and most
'natural' speakers we have heard"
This pair actually has 'Jensen' built 12" woofers from the factory
(my personal Rectilinear III-High-Boys do not. Just FYI.) These are
great sounding 12" 4-way speakers. All drivers feature a
non-deteriorating cloth surrounds. The driver compliment consists of one
heavy duty 12" woofer, one 4" midrange with hi-mid whizzer cone, two
2.5" cone tweeters and 2 1/5" cone super tweeters. Bass is enhanced via
a 3" tuned port.
System input is via binding-post / banana jacks. The input plate also
features midrange and hi-freq attenuators, and the "MADE IN THE USA"
plate. The entire enclosure is damped with batting. The cabinets are a
beautiful American Walnut with very nice grain featured throughout and
are in near new condition. These have great efficiency, but are still
able to handle bigger power. Huge bass and crystal clear highs with just
enough mids.
These
things ROCK! I know. These are the pair from
my personal 'speaker stash / collection'.
They measure 35" tall x 18" wide x 12" deep and each weighs 70 lbs
unpacked. Comes with an 'e-copy' /pdf download of the Rectilinear Owners
manual, as well as a few 'e-copies' of original brochures. Includes our
90 day warranty (excluding problems due to under / over powering)!
RECTILINEAR III
Cond. 8+
with grills
SOLD 5/5/19
SHIPPING TO FRANK IN CONNECTICUT
(Due to the
dimensions and / or weight of
these speakers, Packing / SHIPPED will be
somewhat more 'involved' than typical. Custom,
double-wall boxes will be manufactured specifically for them.
While we order custom built boxes often, this can
sometimes delay SHIPPED by 5-10 days)
(Above
text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW
LISTING 11/9/18
(click on above thumbnails to enlarge
photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED VINTAGE
TECHNICS
SPEAKERS
MCS / TECHNICS
8320
#...A506 / A545 Circa
Late 1970's early 1980's MIJ
SOLD
11/12/18
SHIPPING TO WILLIAM IN MARYLAND These are from an upper-end line of speakers that
Technics produced for
MCS. The
"Linear Motion" line used a Tri-Planer baffle board design to more
correctly "time align" the 'top end'
drivers with the woofer. The Midrange is on a 'spacer' to position it
(time-wise) between the tweeter and woofer. This design was based on the
Flagship (and very expensive) Technics SB-7070 speakers.
Our speaker
tech has completely gone through and 'Certified' these.
We have
completely tested them with both recorded material,
PN 20-20k and swept them with our AF generator.
MCS 8320
Features include:
- 3-Way, Bass Reflex
cabinet - 'Time-Aligned' / Bi-planar baffle board
- 2"
Pulp-cone tweeter
- 4" Pulp-cone Midrange
- 12" Ribbed, Pulp-Woofer with
non-deteriorating
Cloth surround
-
2.25" tuned port for extending low end
- External,
resettable protection relays for all drivers - 'Spring Clip' Speaker
terminals
MCS 8320
Specifications /
Specs:
Frequency Response:
32-22,000Hz +- 3dB
Efficiency:
~92dB 1W@ 1m Nominal Impedance:
8Ω
nominal
Recommended Minimum Power amplifier rating:
15 Watts minimum
Again, all
drivers tested, work and sound fine! Tested for all frequencies with a
sweep generator. Speakers cleaned inside and out.
They
have black cloth grills
and the cabinets are a mixture of black
and
walnut grain vinyl wrapped. Cabinets and
grills are in great shape. Grills still have all locating pins intact and
frames are free of breaks / cracks etc. Each cabinet measures 24" tall x
13.5" wide x 12.25"
deep and weighs 26 lbs unpacked. Includes
our standard 90 day limited warranty ( & excluding problems due to
under / over powering) Technics MCS 8320
Stereo Speakers Condition 8.5++
with grills
(Cons.)
R.R.
SOLD
11/12/18
SHIPPING TO WILLIAM IN MARYLAND
(Above
text, in it's entirety, property of
www.oaktreevintage.com /
Oak Tree Enterprises, LLC. See 'Copyright Information' page for
details)
|

NEW LISTING
11/2018
(click
on above thumbnails to enlarge photos)
warranty
PRE-APPRECIATED
YAMAHA STEREO SPEAKERS / MONITORS
YAMAHA NS-A738 / NSA738 BIRCH FINISH
#...4631
/
4632
(consecutive numbers)
Circa 1999-2000
Made in the USA (yes, really)
SOLD
12/26/18
SHIPPING TO JIM IN LOUISIANA
Great looking, performing and sounding Yamaha NS-A738 3-way
speakers have a room filling, "tight" sound that ensures sonic
accuracy. Great for home use or project studio monitors. If you
can't afford the famous Yamaha NS-10's (now, currently north of
$1000.00), then these may be an affordable alternative for your
project recording studio (I used to be a dealer for NS-10's and
have heard and sold many).
Our
speaker tech has completely gone through and 'Certified' these.
We have completely tested them with both recorded material, PN
20-20k and swept them with our AF generator. Prior to testing
with the sweep generator, we added gasket material under all the
driver flanges in each cabinet to eliminate resonate vibrations.
This is really a 'finishing touch' on this model of Yamaha's
that should have been done at the factory, but is rarely done by
most companies / manufacturers. We also added
'poly-spun' batting to the cabinet space to further tighten up
the low-end, eliminate hollowness / cabinet ringing. Again,
should have been done at the factory, instead of relying an
'empty cab' to allow 'boomy bass' which on the original sales
floor, made the box appear sonically 'larger' than it is by
making the box seem to be producing more bass. The 'bass' that
an un-damped cabinet produces is 'hollow and flappy', and not
what you'll want to listen to over the long haul. That would be
come very fatiguing soon.
Handles power decently and reproduced the low-end in our most
difficult test CD! If you've read some of our
other 'audition notes', you'll know what is meant when I say
that these speakers, "reproduced the "TLC 'Sub-Bass' note'
VERY well" when situated on the floor.
Yamaha NS-A738
Features include:
- 3-Way, Acoustic Suspension design for studio monitoring
"tight bass"
- 8” High-Compliance, Cloth Surround,
Polypropylene Coated, Long-Throw woofer,
woofer w/ non-deteriorating cloth surround
- 4” mid non-deteriorating paper surround
- .75” Ferro-Fluid Cooled, Mylar,
Dome tweeter
- Infinite baffle for exceptionally tight bass
Yamaha NS-A738 Specifications:
Frequency Response:
90-20,000Hz ± 3.5dB
Efficiency:
91dB 1W @ 1m
Nominal Impedance:
8Ω each
Cross-over frequencies: at 4.2kHz & 13.5kHz
(6dB / Octave)
Recommended Minimum Amp Size: 10
Watts
Maximum input power rating: 140
Watts
All drivers work and sound fine! Tested for all frequencies with
a sweep generator and test CD's. Each finished in black, matte,
vinyl wrap. Speakers look and sound GREAT! One of the best "all
around" speakers we've heard in a long time at any size or
price. Each measures 16" tall x 11" wide x 13" deep and weighs
14 lbs unpacked. Includes our standard 90 day limited warranty (
& excluding problems due to under / over powering)
YAMAHA NS-A738 STEREO SPEAKERS
Cond. 8.5+
SOLD
12/26/18
SHIPPING TO JIM IN LOUISIANA
(Above
text property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See
'Copyright Information' page for details)
|

NEW LISTING
11/2018
(click
on above thumbnails to enlarge photos)
warranty
PRE-APPRECIATED
YAMAHA STEREO SPEAKERS / MONITORS
YAMAHA NS-A738 / NSA738 BIRCH FINISH
#...2166
/ 2167
(consecutive numbers)
Circa 1999-2000
Made in the USA (yes, really)
SOLD 2/20/19
SHIPPING TO TED IN ARKANSAS
Great looking, performing and sounding Yamaha NS-A738 3-way
speakers have a room filling, "tight" sound that ensures sonic
accuracy. Great for home use or project studio monitors. If you
can't afford the famous Yamaha NS-10's (now, currently north of
$1000.00), then these may be an affordable alternative for your
project recording studio (I used to be a dealer for NS-10's and
have heard and sold many).
Our
speaker tech has completely gone through and 'Certified' these.
We have completely tested them with both recorded material, PN
20-20k and swept them with our AF generator. Prior to testing
with the sweep generator, we added gasket material under all the
driver flanges in each cabinet to eliminate resonate vibrations.
This is really a 'finishing touch' on this model of Yamaha's
that should have been done at the factory, but is rarely done by
most companies / manufacturers. We also added
'poly-spun' batting to the cabinet space to further tighten up
the low-end, eliminate hollowness / cabinet ringing. Again,
should have been done at the factory, instead of relying an
'empty cab' to allow 'boomy bass' which on the original sales
floor, made the box appear sonically 'larger' than it is by
making the box seem to be producing more bass. The 'bass' that
an un-damped cabinet produces is 'hollow and flappy', and not
what you'll want to listen to over the long haul. That would be
come very fatiguing soon.
Handles power decently and reproduced the low-end in our most
difficult test CD! If you've read some of our
other 'audition notes', you'll know what is meant when I say
that these speakers, "reproduced the "TLC 'Sub-Bass' note'
VERY well" when situated on the floor.
Yamaha NS-A738
Features include:
- 3-Way, Acoustic Suspension design for studio monitoring
"tight bass"
- 8” High-Compliance, Cloth Surround,
Polypropylene Coated, Long-Throw woofer,
woofer w/ non-deteriorating cloth surround
- 4” mid non-deteriorating paper surround
- .75” Ferro-Fluid Cooled, Mylar,
Dome tweeter
- Infinite baffle for exceptionally tight bass
Yamaha NS-A738 Specifications:
Frequency Response:
90-20,000Hz ± 3.5dB
Efficiency:
91dB 1W @ 1m
Nominal Impedance:
8Ω each
Cross-over frequencies: at 4.2kHz & 13.5kHz
(6dB / Octave)
Recommended Minimum Amp Size: 10
Watts
Maximum input power rating: 140
Watts
All drivers work and sound fine! Tested for all frequencies with
a sweep generator and test CD's. Each finished in black, matte,
vinyl wrap. Speakers look and sound GREAT! One of the best "all
around" speakers we've heard in a long time at any size or
price. Each measures 16" tall x 11" wide x 13" deep and weighs
14 lbs unpacked. Includes our standard 90 day limited warranty (
& excluding problems due to under / over powering)
YAMAHA NS-A738 STEREO SPEAKERS
Cond. 8.5+
SOLD 2/20/19
SHIPPING TO TED IN ARKANSAS
(Above
text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|


NEW
LISTING
11/2018
(Click on above thumbnails to enlarge photos)
warranty
SERVICED / REFURBISHED* KENWOOD STEREO PRE- AMP KENWOOD CONTROL AMPLIFIER "Basic C2"
#...0478
Circa
1984-90
SOLD 11/25/19
SHIPPED TO ELLIOT IN WASHINGTON
ü
Our
technician has completely gone through this unit*.
ü
We have completely
gone through this unit, cleaning inside and out including all
contacts, switches and controls.

ü Unit
originally presented with one channel down. As we've had a number of
these, we knew that it was likely the "Balance" control potentiometer.
It was the issue, so the pot was 'jumpered'*.
Fairly 'excusable' work around as most folks are typically leaving their
'balance' control turned to the center 100% of the time anyway.
While this is a fairly versatile pre-amp, that we 'still
like', it does have a few 'difficult to service' issues
and a couple of 'semi-permanent' defects. Firstly
there's a fairly common issue with the 'balance' control
pot. It's anemic / fragile in the first place, which
makes it prone to 'breaking' in such a way that it will
drop channels. We have not found a replacement. There
are a couple of websites that have photo essays on doing
'micro-surgery' on them, but it's very difficult, time
consuming with sketchy results. Probably the most
practical way to address the issue with the balance pot
is to 'jumper' across it. It can either be left in place
or removed once jumpered.

The same 'fix' can be utilized
on the 'Headphone' level pot, then simply use the main volume
of the pre-amp to control the headphone level (like
EVERY other unit does).
(headphone level control still works on this unit)
ü Unit
All RCA I/O jack terminal solder joints re-flowed internally


ü
All inputs tested
and both side produces clean and even sine waves!
ü
No power supply hum
of any kind. It's dead silent!
ü
All inputs tested and both side
produces clean and even sine waves! Checked with O-Scope.
ü
No power supply hum of any kind. It's
dead silent!
____________________________
Versatile Kenwood
"Basic C2" Pre-amp / control center. Would match up well with any power
amp and is very "utilitarian". Loaded with "real world" features.
Again, with the exception of the 'bypassed balance
control', the unit works well and sounds great!
Cosmetically the only issue really worth mentioning
is that the top, metal cover has scratches from someone sitting a unit
with no feet on it and moving it around.
Kenwood C2
Features include:
-
Separate Bass and Treble with selectable turnover frequency - Turnover freqs set at 200 or 400 on the bottom end and 3k or 6kHz on
the top end. - Selector for MM or MC cartridges - 5 position phono cartridge EQ selector (this feature, combined with
the MM/MC selector / head-amp alone can be worth a few hundred dollars,
if you're contemplating moving up to a Moving Coil turntable cartridge.
MC carts require an extra head-amp and this amplifier has one built in) - Built-in Low and Subsonic Filters to eliminate excess rumble from
sources such as turntables. These are selectable for either 58Hz, 40Hz
or 18Hz @ 18dB / Oct.
- Hi
"Scratch" filter set at 8Khz with a slope of 12dB / Oct. Useful for
reducing the 19kHz pilot tone in FM and tape hiss / electronic hiss
& noise
and
record static - Output defeat - Mono / Stereo input selector
- Phono / Turntable input with Built-In Phono Pre-Amp - Dual Tape Monitors with bi-directional dubbing
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.
as well as for CDR) - Dual (1 & 2) Aux inputs
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - CD Input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound. - Headphone output with separate level control - Indicator LED's for input selector - 3 AC convenience outlets ( 2 switched 1 un-switched)
Kenwood C2
Original Specs:
Design type:
2 Channels, Analog operation
Frequency Response:
1-350kHz +0 / -3dB
Maximum Output
Level:
1V
THD: 0.001% at full rated power
Phono MM
Sensitivity:
2.5mV for 5.0V output @ 1kHz
Phono MM Maximum
Input Level:
200mV
Phono MC
Input Impedance:
Selectable
S/N on Phono MM w/
5mv signal:
94dB
Phono Capacitance:
Selectable
High Level
Sensitivity (tuner, Aux, Tape):
150mV
The Kenwood C2 has always been one of
our favorite pre-amps under $600-$800.
It's simply hard to beat for specs, features and performance. That is
also evidenced by the fact that it was current in Kenwood's lineup, as
their upper end pre, for almost half a decade. Again, we have completely
gone through the unit cleaning all contacts, pots, switches and
controls. All functions (again, with the exception of
the 'Balance' control') test as original. Unit looks and sounds
great! Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs
unpacked. Comes with original owners manual and includes our 90 day
limited warranty.
KENWOOD
BASIC C2
Condition
7.5 (due to balance control issue)
SOLD 11/25/19
SHIPPED TO ELLIOT IN WASHINGTON
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|


NEW
LISTING
11/2018
(Click on above thumbnails to enlarge photos)
warranty
SERVICED / REFURBISHED* KENWOOD STEREO PRE- AMP KENWOOD CONTROL AMPLIFIER "Basic C2"
#...0258
Circa
1984-90
SOLD 1/30/20 SHIPPING TO STEVE IN OHIO
ü
Our
technician has completely gone through this unit*.
ü We have completely
gone through this unit, cleaning inside and out including all
contacts, switches and controls.

ü *Unit
originally presented with one channel down. As we've had a number of
these, we knew that it was likely the "Balance" control potentiometer.
It was the issue, so the pot was 'jumpered'*.
Fairly 'excusable' work around as most folks are typically leaving their
'balance' control turned to the center 100% of the time anyway.
While this is a fairly versatile pre-amp, that we 'still
like', it does have a few 'difficult to service' issues
and a couple of 'semi-permanent' defects. Firstly
there's a fairly common issue with the 'balance' control
pot. It's anemic / fragile in the first place, which
makes it prone to 'breaking' in such a way that it will
drop channels. We have not found a replacement. There
are a couple of websites that have photo essays on doing
'micro-surgery' on them, but it's very difficult, time
consuming with sketchy results. Probably the most
practical way to address the issue with the balance pot
is to 'jumper' across it. It can either be left in place
or removed once jumpered.
 The same 'fix' can be utilized
on the 'Headphone' level pot, then simply use the main volume
of the pre-amp to control the headphone level (like
EVERY other unit does).
ü Unit
All RCA I/O jack terminal solder joints re-flowed internally


ü *Unit
also has an issue with the
*'Hi-Filter'
switch. While it has been cleaned and lubed, it will not 'lock in' so
consider there's no 'Hi-Filter' on this one
(yes,
the circuitry still functions, but was not practical for use to source a
replacement switch on this unit with the other two issues. "Hi-Filter"
is also a fairly 'fringe' feature and seldom used by most folks, so we
decided it was 'excusable')
ü *Unit
also has the issue, common with the "Balance" control potentiometer
affecting the headphone amplifier, with additional issue with the
'headphone' section, thus we have bypassed the entire headphone
functions on this one.
ü
All inputs tested
and both side produces clean and even sine waves!
Checked
with O-Scope.
ü
No power supply hum
of any kind. It's dead silent! ____________________________
Versatile Kenwood
"Basic C2" Pre-amp / control center. Would match up well with any power
amp and is very "utilitarian". Loaded with "real world" features.
Again, with the exception of the 'bypassed balance
control', the unit works well and sounds great!
Cosmetically the only issue really worth mentioning
is that the top, metal cover has scratches from someone sitting a unit
with no feet on it and moving it around. Also, as the 'Balance' and
'Headphone Level' are 'non-functional', we inserted hole plugs where the
knobs would be (the pots are still there if anyone wants to attempt a
repair in the future.)
Kenwood C2
Features include:
-
Separate Bass and Treble with selectable turnover frequency - Turnover freqs set at 200 or 400 on the bottom end and 3k or 6kHz on
the top end. - Selector for MM or MC cartridges - 5 position phono cartridge EQ selector (this feature, combined with
the MM/MC selector / head-amp alone can be worth a few hundred dollars,
if you're contemplating moving up to a Moving Coil turntable cartridge.
MC carts require an extra head-amp and this amplifier has one built in) - Built-in Low and Subsonic Filters to eliminate excess rumble from
sources such as turntables. These are selectable for either 58Hz, 40Hz
or 18Hz @ 18dB / Oct.
- Hi
"Scratch" filter set at 8Khz with a slope of 12dB / Oct. Useful for
reducing the 19kHz pilot tone in FM and tape hiss / electronic hiss
& noise
and
record static (again, NON-functional on this
particular unit, #...0258) - Output defeat - Mono / Stereo input selector
- Phono / Turntable input with Built-In Phono Pre-Amp - Dual Tape Monitors with bi-directional dubbing
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.
as well as for CDR) - Dual (1 & 2) Aux inputs
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - CD Input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound. - Headphone output with separate level control
(again, NON-functional on this particular unit, #...0258) - Indicator LED's for input selector - 3 AC convenience outlets ( 2 switched 1 un-switched)
Kenwood C2
Original Specs:
Design type:
2 Channels, Analog operation
Frequency Response:
1-350kHz +0 / -3dB
Maximum Output
Level:
1V
THD: 0.001% at full rated power
Phono MM
Sensitivity:
2.5mV for 5.0V output @ 1kHz
Phono MM Maximum
Input Level:
200mV
Phono MC
Input Impedance:
Selectable
S/N on Phono MM w/
5mv signal:
94dB
Phono Capacitance:
Selectable
High Level
Sensitivity (tuner, Aux, Tape):
150mV
The Kenwood C2 has always been one of
our favorite pre-amps under $600-$800.
It's simply hard to beat for specs, features and performance. That is
also evidenced by the fact that it was current in Kenwood's lineup, as
their upper end pre, for almost half a decade. Again, we have completely
gone through the unit cleaning all contacts, pots, switches and
controls. All functions (again, with the exception of
the 'Balance' control') test as original. Unit looks and sounds
great! Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs
unpacked. Comes with original owners manual and includes our 90 day
limited warranty.
KENWOOD
BASIC C2
Condition
7 (due to balance control, headphone amp and
Hi-Filter issues)
SOLD 1/30/20 SHIPPING TO STEVE IN OHIO
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW ADDITION
1/22/19
(Click
on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED
& WARRANTED
PRE-APPRECIATED KENWOOD POWER AMPLIFIER KENWOOD
KM-106 / KM106 POWER AMP (same as KM-105 with different graphics)
'Military Market' / PX UNIT
500 WATT MONSTER!!! #...1149 Circa 1985-86 MIJ
SOLD 1/30/20
SHIPPING TO STEVE IN OHIO
ü
Our technician has completely gone through and 'Certified' this
unit.
ü
Unit
bench checked / tested.
ü
Amp
has been cleaned inside and out.
ü
Face
removed, meter illumination lens removed, cleaned and reattached.
ü
All
new panel illumination lamps replaced with new.
ü
All
functions have been tested and pass with flying colors!
Amp designed using Huge Power Supply Transformer and oversized,
vertical finned heat sink for very efficient and silent, passive
cooling of output devices. All inputs tested and both side produces
clean and even sine waves! No power supply hum of any kind. It's
dead silent! Following restoration procedures, we burned it in, in
the shop at continuous volume for 48 hours
straight and it functioned flawlessly. While this amp is originally rated at 125 Watts with both channels
driven (250W + 250W "Peak Music Power"), on our test bench, this
particular unit's (#...1149) amplifiers
produced 38 Volts at 8 Ohms per channel for
180 Watts /
channel and 33 Volts at 4
Ohms per channel for
272 Watts / channel via discrete output transistors
(2x Sanken 2SA1215
& 2x 2SC2921. (Idle AC current draw @ .4A.
Floor noise measured at L= 00.0mVAC and R=00.0mVAC
/ -60dBm) Great, later model power amp by Kenwood. Model KM-106.
HUGE power output! Excellent for 2-channel (stereo) audio listening
or for use in an A/V system. Lots of punch and headroom.
Kenwood KM-106 Features:
- Old Skoool Class A/B amplifier design (NO
Digital here!)
- 2- Channel stereo operation - A or B speaker selector via high current relay
- Dual, Vertical, 7-Segment LED Power
Output Meters with Dual Position Level Selector - Built-in Protection circuit - LED Status indicators - Front-mounted 1/4" stereo headphone jack - RCA input jacks - Dual, vertical finned internal heat sink - Oversize power supply transformer - 3 Rear-mounted AC convenience outlets (2 switched and 1
un-switched for a total capacity of 200 Watts)
Kenwood KM-106 Original Specs:
"125 Watts per channel minimum RMS, both channels driven @
8ohms, 20-20k, with no more than 0.03% THD" Design type:
2 Channels, AB operation Damping Factor: >35 @
50Hz / 8 ohms Signal / Noise: 120dB A weighted
Rated RMS Output: 125
Watts per channel, min. RMS, @ 8Ω, both
channels driven, from 20Hz to 20kHz. Music Power
250 Watts + 250 Watts THD:
0.03% at 'Full Rated Output'
/ 8Ω w/
20-20kHz 0.015% @ half rated power / 8Ω w/ 20-20kHz 0.002% @ half rated power / 8Ω w/ 1kHz
IMD: 0.002% @ rated power / 8Ω Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
Potential Frequency Response: 5Hz-200kHz Again, as stated before, our technician has completely refurb'd
this Kenwood KM-106, stereo Power-Amp, cleaning
and testing all and it gets our full 'Certification'.
Great 'all around' power amp for about any audio system. We have
sold MANY of this series of Kenwood power amps
over the past 2+ decades, with never a complaint. Includes an
'e-copy' pdf download of the Kenwood KM-106 owners / users /
instruction manual. Unit looks, works and sounds
great! Unit measures 16.5" wide x 10.5" deep x 4.75" high and weighs
18 lbs unpacked. Includes our standard 90 day limited warranty. KENWOOD KM-106 Cond. 8.5++
SOLD 1/30/20
SHIPPING TO STEVE IN OHIO
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|



NEW
LISTING
1/8/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED
& WARRANTED
VINTAGE MITSUBISHI POWER AMPLIFIER
MITSUBISHI DA-A10DC STEREO POWER AMP
WITH ORIGINALLY OPTIONAL MITSUBISHI DA-M10
METER BRIDGE
TRUE DUAL POWER SUPPLIES
ONE
OWNER!
MIJ
SOLD 12/20/19
SHIPPED
TO RICK IN INDIANA
DC-C20, DA-M10 & DA-A10DC
(see listing to the left for details on the 'Pre-amp / Tuner')
ü Our
technician has completely gone through and 'Certified' this unit.
ü Much
of amplifier disassembled, the everything cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.

ü Internal fuses checked for correct value / function and replaced where
necessary.

ü Solder
joints reflowed on all possible high heat and stress points
ü Amplifier section had output bias and DC offset adjusted to spec
levels after 10 min warm-up.

ü Meter
Lamps replaced with correct bulbs (8V / 200mA)

ü Analog,
VU / D'Arsonval Meters adjusted 'mechanically' for 'Zero' position, and
electronically to match amp output.
ü All functions tested for perfect operation.
ü Following above procedures, unit was cosmetically detailed inside and
out.
ü All inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü Following
service / refurb procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
Total
restoration time investment
10.5+
hours. You will not be disappointed.
On our test bench, each internal amplifier of this particular unit, #...0128,
produced peak power
of
31.5 Volts per channel at 8 ohms for
124 Watts per channel and
27Volts at 4 ohms for
182
Watts per channel via discrete output
transistors (2X Sanken
2SA908 & 2SC1585). AC Idle current at
450mA. Floor noise
> -60dBm.
____________________________
Performs and sounds fantastic! All inputs tested and both side produces
clean and even sine waves! No power supply hum of any kind. It's dead
silent! Following restoration procedures, we burned it in, in the shop
for 48 hours and it functioned flawlessly (we actually took it into our
'demo' system and 'rocked-it' HARD on our Altec VOTT's. HUGE sound and
thump).
This is a Huge and Beautiful looking, performing and sounding power
amplifier. Great 'High-Tech' look (in 'vintage terms
anyway). Cosmetically, it looks great with
only a few minor 'dings / scratches', mostly not visible from the front.
The minor scratches on the front are faint and fairly 'un-noticeable'
(see photos above).
While it could be used with any other pre / control amp, as they came in
as a pair from the original owner, we only want them to stay together to
their 'new' owner.
Mitsubishi DA-A10DC
/ DA-M10 Features:
- True DUAL power supplies (has a lot to do
with how much this amp 'punches'. (See photos above of power supply)
- Huge, Externally located, 'vertically finned'
heat-sinks
- DC protection for 'Turn-On Surge' and 'Output'
- A and / or B speaker selector
- Front mounted 'Gain / Level' controls via
the Meter option on the front. Power amp has input levels on the rear
panel as well (slotted heads for screw-driver)
- Huge, Beautiful, Lit VU Power Output meters
- Meter Range selector for either normal or 'x 0.1'
- 'Thermal Indicators' located on heat-sinks (think
"mood ring" technology)
- Signal inputs via standard RCA jacks
- Three-pin jack for 'Mitsubishi' connector cord to
Mitsubishi Pre-amp speaker switch controller
Mitsubishi DA-A10DC Specifications:
Rated RMS Output:
100 Continuous Watts
per channel, min. RMS, @ 8Ω, both channels driven, from 15Hz to
30kHz.
Power Bandwidth: 10Hz
to 100kHz @ 8Ω, both channels driven
Signal to Noise Ratio: 107dB
un-weighted (closed input), 122dB (20Hz to
20kHz) at full RMS output (closed input)
Total Harmonic Distortion (THD): <0.01%
@ rated output, <0.005%
@ half output
IMD: 0.008% @ rated
power / 8Ω
Slew Rate:
30V/μsec
@ 8 Ohms / 50V P-P
Damping Factor: 100 @ 8 Ohms / 20Hz to
20kH
Load Impedance: Rated for 16, 8 or 4
Ohm
use
Input Impedance: 50k Ω nominal
Input Sensitivity: 1V for rated power into 8Ω
Channel Separation: 100
dB @ 1kHz and 80dB @ 20kHz
Input Connector: Standard RCA jacks
Again, as stated before, we have completely gone through this
Mitsubishi DA-A10DC,
Power Amplifier cleaning and testing all and it gets our full 'Certification'.
This is an amazing performing and sounding
amp. We have 'stood on it' hard, with a number of our speaker loads (the
most fun being when connected to our Altec 'Voice of the Theaters'. It's
a huge sounding and punchy amp, with lots of 'head room'. Handles 'REAL'
high power levels perfectly well. If you are looking for serious,
vintage power, it ain't gonna get much better than this.
Also includes the
original 3-pin, umbilical speaker control cable for connecting the power
amp to the speaker selection section of the pre-amp.

Comes with an e-copy, pdf download, of the
Mitsubishi DA-A10DC
Owners Manual and Service Manual.
Measures standard 17" wide x 15" depth x 6.75"
tall and weighs 46 lbs unpacked.
Total weight of all three components is 65 lbs. Includes our
standard 90 day limited warranty.
Mitsubishi DA-A10DC
Power Amplifier /
DA-M10
Meter / Control panel.
Cond. 8.5+
all three components
SOLD 12/20/19
SHIPPED
TO RICK IN INDIANA
DC-C20, DA-M10 & DA-A10DC
(see listing to the left for details on the 'Pre-amp / Tuner')
(Above text,
in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|



NEW
LISTING
1/8/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED
& WARRANTED VINTAGE
MITSUBISHI STEREO PRE-AMPLIFIER / AM/FM TUNER MITSUBISHI DA-C20
DUAL MONO CONSTRUCTION #...0324
Circa
1978-'80
MIJ SOLD 12/20/19
SHIPPED
TO RICK IN INDIANA
DC-C20, DA-M10 & DA-A10DC (see listing to the right for details on the 'Power Amp / Meter
bridge')
ü
Our technician has completely gone
through and 'Certified' this unit.
ü Following ext / int visual inspection entire unit was cleaned inside
and out including all contacts, switches and controls
(VERY difficult to access. Requires complete tear down to clean controls
properly).

ü Meters calibrated per service manual.
ü Switches and controls now clean sounding and performing solidly.
ü All functions tested for perfect operation.
ü All inputs tested and both side produces clean and even sine waves!
ü No
power supply hum of any kind. It's dead silent!
ü Following electronic refurb, entire unit was cosmetically detailed
(as it 'practically' allowed).
ü We also aligned the tuner front-end on both AM & FM bands for optimum
performance as older tuner components will have 'drifted' over the
years.
ü AM 'Stick'
ferrite core adjusted for optimum reception and minimal noise
ü AM 'Stick'
antenna 'ball and socket' inspected and is holding well.
ü
Tuner string checked for
any fraying then re-tensioned to increase traction & relieve
flywheel binding and re-centered pointer to correct dial position.
ü VERY GOOD TUNER! Generally AM reception in a stereo receiver
is treated as an 'after thought', but the AM reception on this one is
WAY above average. Pulls in stations like an old 'Tube' radio! FM
reception also incredible and IMPECCABLY CLEAN!!!
ü Following
service / refurb
procedures, the unit was ran continuously at medium volume, as all
our amplifier / receivers are, into a 4 Ohm load with "Loudness" on and
both Tone Controls at 10 for 48 hours. Total restoration time investment
11+
hours. You will not be disappointed.
Very
classy 'Pewter / Silver' face
Mitsubishi Pre-Amp / Tuner.
VERY impressive in stature and cosmetics. Looks great with matching
Meter Bridge attached to Mitsubishi power amp. Cosmetically it's in
BEAUTIFUL condition with only items worth mentioning would be some light
finish scuffing on one end from being set on it's side (not visible from
front of unit) and the word "Power" missing all but the "P" from the
silk screening above power switch (see photos above).
Mitsubishi DC-C20 AM/FM Tuner / Pre-Amp
Features
and 'Creature Comforts' include:
-True Dual Channels w/ separate L & R Tone /
Output levels - Delay power On / Power Off sequencing when connected to
power amplifier - Speaker selector for A or B, A+B or Off (when
connected to amplifier via proper umbilical cord) - Subsonic filter with 18Hz cut-off built-in for cutting turntable
rumble - Super quality de-tented Attenuator (volume)
control - Separate L & R Tone Defeat for purest tone path if so desired - Separate
L & R Bass and Treble with high quality de-tented controls - Pre-amp section 'Stereo / Mono'
/ Reverse Stereo selector - Dual tape deck monitors (Tape Monitors can be used with Video /
CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® /
iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for
inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special
Effects units, Time Delays, etc) - Bi-Directional Tape Duplication -
Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amp
for MM or MC - Tuner input (may also be used for Video / CD / DVD / LD / VCR /
DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget /
eReader / MP3 / XM® / SIRUS® etc.) - AUX input (may also be used for Video / CD / DVD / LD / VCR / DAT
/ MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3
/ XM® / SIRUS®, audio mixers, computer sound-cards etc.) -
Analog / D'arsonval Signal Strength meter
-
Analog / D'arsonval Center Tune meter -
Wide / Narrow Band selector for Tuner -
Tuner 'Lock' for drift-free reception -
FM Mute / Stereo / Mono selector -
Vertical and Horizontal Multi-path RCA outputs - Front mounted 1/4" stereo headphone jack
- Side panel features full RCA patch bay for all inputs
(each 'fastened separately' to the rear panel, and 'point to point'
wired internally, instead of being soldered directly to the circuit
board, which is always a 'failure point').
- 3-Pin connector for amplifier umbilical speaker connectors for A&B
speakers - 2 Switched and
1
un-switched AC outlets for a maximum load of 900
Watts of external
gear.
Mitsubishi DC-C20 AM/FM Tuner / Pre-Amp Original Specifications:
TUNER SPECS: Tuning Capacitor:
5-gang Tuning Range:
88-108MHz Freq Response: 30-15kHz
(FCC Limits) Useable Sensitivity: Mono 11.2 dBf / 2.0
μV Stereo 22.7 dBf / 7.5 μV
50dB Quieting Sensitivity:
Mono 19.2 dBf / 5.0 μV
Stereo 39.2 dBf / 50 μV S/N @ 65dBf: >80db Mono or 75dB Stereo
Capture Ratio @ 65dBf (Wide / Narrow):
0.8 dB
/ 1.5 dB THD Mono @ 1kHz: 0.05%
(Wide) THD Stereo @ 1kHz: 0.08%
(Wide) FM Alternate Channel Selectivity (Wide /
Narrow): 45dB / 75dB Spurious
Noise Ratio: 90dB IF Response Ratio:
80dB AM Suppression:
(Wide /
Narrow): 55dB / 50dB Stereo Separation (Wide / Narrow):
45dB @ 1k & 35dB
@ 10kHz
/ 40dB @ 1k & 30dB @ 10kHz
Subcarrier Product
Product Ratio: 70dB
Image Response Ratio:
80dB Antenna Impedance:
75 or
300 Ohms
TUNER SPECS FOR AM (IHF):
Tuning Range: AM Band 525 kHz-1605 kHz S/N: >50db
Useable Sensitivity (IHF Bar Antenna): 45
dB Selectivity: 30dB @ 1kHz
Hum & Noise: 50dB
THD: 0.8% IF
Response Ratio: 70dB
Image Response Ratio:
40dB
PRE-AMP SPECS:
S/N
(IHF):
110dB for 'non-phono' inputs
THD: 0.003%
across 20-20kHz
@ rated attenuator output of -20dB
Freq
Response (non-phono inputs):
10Hz-100kHz at full rated power
Input
Sensitivities 'non-phono' inputs for full rated
output:
150mV / 50kΩ via RCA's
Output at
Main Output:
1V for 'rated
output' @ 600 Ohms
Output at Tape Monitors:
150mV / 600 Ohms
via RCA's
Bass Control: ±10dB @ 100Hz
Treble Control: ±10dB @ 10kHz
Subsonic Filter: -6dB / oct @ 18Hz
Output at
Headphones:
600mV
(at output
of 1V) / 15 Ohms. 650mV max.
Phono
Section:
Freq
Response:
20Hz-20kHz RIAA EQ
S/N:
MM= 84dB
(Shorted)
MC= 77dB
(terminated w/ 47 Ohms)
Phono
THD: MM=
0.003% @
20-20kHz
MC=
0.005% @
20-20kHz
Phono
MM Sensitivity:
2.5mV / 50k Ohms / 10pF
Phono
MC Sensitivity:
0.1mV /
10 Ohms
Phono Maximum Input Level:
MM=
290mV
RMS while still maintaining 0.1% THD @ 1kHz
MC=
12mV
RMS while still maintaining 0.1% THD @ 1kHz Again, as stated before, our technician has completely refurb'd this
Mitsubishi DC-C20 AM/FM Tuner / Pre-Amp, cleaning and
testing all and it gets our full 'Certification'.
Entire unit, including the original brushed aluminum, Face and knobs
are in beautiful condition. Unit looks beautiful and sounds great.
This is the first 'complete combo' of these
components we've had.
Comes
with an 'e' copy / pdf download of the original
Mitsubishi DC-C20 AM/FM Tuner / Pre-Amp users manual and
service manual if purchaser so desires.
Also includes the original 3-pin, umbilical
speaker control cable for connecting the power amp to the speaker
selection section of the pre-amp.

Measures 16.75" wide x 11.5" deep x 6.75"
tall and weighs 19 lbs
unpacked.
Total weight of all three components is 65 lbs.
Includes our 90 day
limited
warranty!
Mitsubishi DC-C20 AM/FM Tuner / Pre-Amp
Cond.
8.5+++
all three
components
SOLD 12/20/19
SHIPPED
TO RICK IN INDIANA
DC-C20, DA-M10 & DA-A10DC
(see listing to the right for details on the 'Power Amp / Meter
bridge')
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|

NEW
LISTING
1/11/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE PIONEER STEREO INTEGRATED AMPLIFIER
PIONEER SA-7500 / SA7500
MIJ
Circa
1976-78
SOLD 3/17/19
SHIPPED
TO STEVE IN CONNECTICUT
ü
Our
technician has completely gone through and 'Certified' this unit.
ü
Everything was cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.
ü Internal fuses checked for correct value / function and replaced where
necessary.
ü
Solder
joints reflowed on all possible high heat and stress points
ü
Amplifier section had output bias and DC offset adjusted to spec
levels after 10 min warm-up.
ü
All functions tested for perfect operation.
ü
Following above procedures, unit was cosmetically detailed inside and
out.
ü
Surface corrosion
painstakingly removed from all RCA I/O jacks and binding post
flanges
ü
All inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü
Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
(Technicians note, "this is a very 'tech friendly & serviceable'
amplifier design")
Total tech time 7 hours.
On our test bench, each internal amplifier of this particular unit, #...328M,
produced peak power
of
21
Volts per channel at 8 ohms for
55 Watts per channel and
17 Volts at 4 ohms for
76
Watts per channel via
TO3, metal cased, discrete output
transistors (2x 2SB541 & 2SD388).
DC offset set to 0 mVDC
both channels w/ 5.1k Ohms shorting plugs. Bias set to correct
30mVDC AC Idle current at
200mA. Floor
noise >-60dBm.
____________________________
Great performing, sounding
and Versatile, Pioneer SA-7500 integrated
amplifier. Great amp for 2-channel stereo
systems up to medium-large and "recording
studio" use. "Real" output transistors and
substantial power supply!
Just a great 'all-around utility' amplifier for probably more than
80% of the audio systems out there.
Pioneer SA-7500 Features:
- Speaker selector for A or B, A+B or Off
- Super quality volume attenuator
- Separate Bass and Treble with high quality
de-tented potentiometers
- Tone-Defeat feature. Bypasses tone control circuitry for
purest signal path
- Bass Tone control center selectable for either 200Hz or 400Hz
- Treble Tone control center selectable for either
2.5kHz or 5kHz-
Built-in Low / Sub-Sonic filter for cutting turntable rumble
/ feedback
- Built-in High filter for reducing 19 kHz FM pilot tones and tape
hiss and AM noise
- Instant -20dB Audio-Muting
/ Volume attenuation
- Dual tape deck monitors with 'Tape-2'
having a DIN as well as RCA I/O's. (Tape Monitors can be used with Tape decks
such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape
Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® /
iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® CDR (CD recorders as
well as for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special Effects
units, Time Delays, etc) - Tape Dubbing Capability - Dual Phono / Turntable inputs w/ built-in Phono Pre-Amp - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3
/ iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs)
- Stereo Mode switch for Stereo / Mono-Mix / Stereo-Reverse, L or R
selector (very handy for trouble-shooting system
and speakers
- Front mounted 1/4" stereo headphone jack
- Rear mounted, 1/4" microphone input
- Pre-Amp out / Power-Amp In RCA loop to connect
the pre-amp to a larger power or an 'additional' power amp, or to
use the 'power-amp' with another system
such as in a small PA system.
- Triple AC convenience outlets with 2 switched and 1 un-switched
for a total capacity of 200 Watts of accessories
Pioneer SA-7500 Specifications:
Output: Continuous 40 Watts per
channel, min. RMS, at 8 Ohms & 45 Watts
per channel, min. RMS, at 4 Ohms, both channels driven,
from 20Hz to 20kHz.
Design type:
2 Channels, Integrated Pre /
Class A/B operation Power Amplifier
Damping Factor:
>25@ 20-20kHz into
8Ω
THD: 0.3%
at full rated power into 8Ω
w/ 20-20kHz & 0.05% @ half power (20 WPC)
Freq Response
of power amp:
10Hz-80kHz
Freq Response
of Pre-amp:
10Hz-50kHz
S/N:
90dB for Tuner, Tape
and AUX inputs
Bass Control: ±7dB
/ ±11dB
@ 100Hz
Turnover selectable 200Hz / 400Hz
Treble Control: ±7dB
/ ±11dB
@ 10kHz
Turnover selectable 5kHz / 2.5kHz
Subsonic Filter: -6dB / oct @ 30Hz
High Filter: -6dB / oct
@ 8kHz Loudness Control: +8dB @
100Hz & +4dB @ 10kHz
(-40dB Vol Level)
Input Sensitivities:
Non-Phono
inputs = 150mV
/ 50kΩ
Input Sensitivity Power Amp:
1V
/ 50kΩ
Tape outputs:
150mV
Pre-Amp
outputs:
1V
Microphone
Sensitivity Power Amp:
7.5mV
/ 85kΩ
PHONO SECTION SPECS: Freq
Response:
30Hz-15kHz w/ RIAA
Equalization of ±0.3dB
S/N: >70dB
Input Sensitivity: 2.5mV @ 50kΩ Phono Overload:
200mV
Again, we have complete gone through and tested all functions of
this unit. It sounds incredible. Unit looks great with only slight, minor cosmetic
issues to the face (see lower right photos above).
All functions test
perfectly and it sounds great! Again, great amp
for medium to med-large audio systems, and where someone needs a
'solid' amount of features without 'fluff'.
Comes with an 'e-copy', PDF download of the
Pioneer SA-7500 owners / users / instruction manual and the service
manual if the purchaser desires. Measures 16.5" wide x 13.5"
deep x 5.75"
tall and weighs 27 lbs unpacked.
PIONEER SA-7500
Cond. 8.5
(Cons. M.H.)
SOLD 3/17/19
SHIPPED
TO STEVE IN CONNECTICUT
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING
12/18/18
(Click
on above thumbnails to enlarge photos)
warranty
VINTAGE & FULLY SERVICED WITH WARRANTY
KENWOOD PRE-AMP / CONTROL AMPLIFIER
KENWOOD BASIC C-1
#...0534
Circa
'84
Made in
Japan
SOLD 2/28/19
SHIPPED TO MARK IN CALIFORNIA
ü Our
technician has completely gone through this unit.
ü We have completely
gone through this unit, cleaning inside and out including all
contacts, switches and controls.
ü Unit
All RCA I/O jack terminal solder joints re-flowed internally


ü Unit
cosmetically detailed, but does have a few scratches on the metal
case /cover
ü All
functions tested for perfect operation.
ü All
inputs tested fine following I/O re-flow
operation
ü Both
sides produce clean and even sine waves!
ü No
power supply hum of any kind. It's dead silent!
____________________________
Great
'utilitarian' pre-amp (in fact, while waiting 4 years for two
missing knobs to show up, we've been using it here on a number of
systems so I'm VERY familiar with it).
GREAT sounding as well. Check out the 108dB S/N!!!
Kenwood C-1 Pre-amp / control center.
Kenwood
C-1
Features include:
- Separate Bass
and Treble Controls
- Variable Loudness (Not just a push switch for On / Off)
- Dual tape monitors with A>B dubbing
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.)
- AUX / CD
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.)
- Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.)
- Phono / Turntable input with Built-In Phono Pre-Amp
- Selector for MM or MC cartridges as it has a
built-in Moving Coil Head Amp (that's worth the 'price of admission'
if you need it)
- Subsonic filter for reducing turntable rumble / feedback
- Loudness
- Indicator LED's for input selector
- 3 AC outlets ( 2 switched 1 un-switched) for a total capacity of
300 watts
Kenwood C1 Original Specs:
Design type:
2 Channels, Analog operation
Frequency Response
(non-phono input):
1-250kHz +0 / -3dB
Maximum Output
Level:
5V
THD Tuner, AUX and Tape, 20-20,000Hz: 0.004%
@ 1V output
Signal / Noise Ratio: 108dB!!! @ Tuner,
Aux, Tape A/B inputs Input Sensitivity AUX / Tape @ RCA's: 150mV @
47k Ω @ 1kHz for
rated output
Output AUX / Tape @ RCA's:
150mV @ 47k Ω
Subsonic Filter: >-3dB @
30Hz, 6 dB/Oct Loudness Control: 0-+9dB
continuously variable
(-30dB Vol Level)
PHONO SECTION SPECS:
Freq Response:
RIAA Standard curve
30Hz-20kHz w/ RIAA deviation of ±0.3dB
S/N:
>87dB MM, >70dB
MC
THD Phono MM or MC, 20-20,000Hz: 0.005%
@ 1V output
Input Sensitivity (nominal) MM: 2.5mV @
47kΩ
Input Sensitivity (nominal) MC:
.25mV @ 100Ω Phono Overload
for MM:
200mV yields THD 0.005%
@ 1kHz
Phono Overload for MC:
15mV yields THD 0.005%
@ 1kHz
This
is a great control pre-amplifier for if you just
need a good 'utilitarian' pre-amp (but with a built-in MC Head Amp).
Perfect for basic control of system. Unit looks and sounds great!
Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs
unpacked. Includes our standard 90 day limited warranty.
KENWOOD
BASIC C-1
Cond. 8.5
SOLD 2/28/19
SHIPPED TO MARK IN CALIFORNIA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING 5/1/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED /
FULLY
SERVICED & WARRANTED OLD-SCHOOL, 2-CHANNEL STEREO VINTAGE PIONEER STEREO INTEGRATED AMPLIFIER PIONEER SA-9100 / SA9100 #...540M Circa 1973-75
"WORLD
AC POWER"
™ MIJ
SOLD 9/25/19
SHIPPED
TO JEREMY IN CALIFORNIA
ü
Our
technician has completely gone through and 'Certified' this unit.
ü
Everything was cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.
ü
Internal fuses checked for correct value / function and replaced where
necessary.
ü
Original issues were 'early clipping' on Right
channel 'Positive' peak (visible on Oscilloscope), Quite high DC at
speaker outputs, the AWR-032 power supply board that had completely
wrong Voltage values on one side and a 'popping' 'Tone Defeat' and
'Filter' Switch circuit boards (AWK-021 & AWS-040) (most rectified
following below service).
ü Replaced
20+ electrolytic capacitors as well as some transistors and resistors
ü
Solder joints
reflowed on probable high heat and
high stress points
ü New
8V lamps installed (#25-140)
ü Following 10-min warm-up Amplifier section had output bias
and DC offset adjusted to spec levels
ü All functions tested for perfect operation.
ü Following above procedures, unit was cosmetically detailed inside and
out.
ü All
inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
(Technicians note, "this is a very 'tech friendly & serviceable'
amplifier design") Total tech time
25+ hours.
While this unit was originally rated at 60 WPC @ 8Ohms, on our test
bench, the internal amplifiers of this particular Pioneer SA-9100,
Integrated Amplifier, #...1869, produced 24+
Volts per channel for 75+ Watts per channel at
8 Ω and 20+ Volts at 4 Ω for 100
Watts per channel via discrete, metal cased, TO-3 style outputs @
1khz. (2x Toshiba 2SA679 & 2x Toshiba 2SC1079 devices) (Idle
Mains AC current draw @
420 mA. Bias set to spec / 25mVDC DC offset brought from 80 & 105 mVDC to
<2mVDC following
power supply circuit board rebuild and driver board refurb Floor noise measured at L= 3mVAC and R=3mVAC) ____________________________ Powerful and Versatile, Pioneer 'Flagship' for 1973, the SA-9100
integrated amplifier. This is one of the most 'meticulous' built amps
out of Japan we have seen. Incredibly well designed and built. Great amp
for serious 2-channel, home-audio and "recording studio" use. "Real"
TO-3 outputs and HUGE
power supply!
Pioneer SA-9100 Features include: - Very well built output section and serious power supply - Speaker selector for A or B or C, A+B, A+C or Off - Incredible 'Single-Ended / Push-Pull' EQ circuit that is physically
'fully shielded' - Separate Bass and Treble with high quality, de-tented controls
utilizing "fixed resistors and capacitors" at 2dB intervals, as
opposed to typical carbon trace. This is a VERY expensive style of
potentiometer to design into a unit. They are not prone to the
"scratchiness" / dirt that most variable resistors are. - Dual Bass controls centered at 50Hz and 100Hz - Dual Treble controls centered at 10kHz and 20kHz -
Tone-Defeat feature. Bypasses tone control circuitry for
purest signal path - Built-in Low / Sub-Sonic filter for cutting turntable rumble. Center
selectable for either 'Subsonic' 8Hz or Low-Cut 30Hz - Built-in High filter for reducing 19 kHz FM pilot tones and tape
hiss. Center selectable for either 8kHz or 12kHz - Triple-Range Attenuation selector for volume pot to allow 'finer'
adjustment -Rear located controls for adjusting the levels between 'AUX-2',
'Phono-2' & 'Speaker-2' for 'comparative' listening tests - Instant Audio-Muting for either-15dB or-30dB attenuation - Dual tape monitors
(Tape Monitors can be used with Tape decks
such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape
Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® /
iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® CDR (CD recorders as
well as for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special Effects
units, Time Delays, etc) - Tape 'Duplicate' / dubbing capability - Dual AUX Inputs
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 /
iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 /
iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Dual Phono / Turntable inputs with Built-In Phono Pre-Amp - Phono impedance selectable for either 25, 50, or 100kΩ - Stereo Mode switch for Stereo / Mono-Mix / Stereo-Reverse, L or R
selector - Speaker output protection circuit (not just a fuse as is typical in
'Vintage' gear) - Front mounted 1/4" stereo headphone jack - Pre-Amp out / Power-Amp In RCA loop
with built-in Connect / Separation switch. - Triple AC outlets ( 1 switched, 2 un-switched) for a total capacity of
200 Watts
-
True "WORLD AC POWER"™
allows unit to be operated on 50 or 60 Hz AC and will select voltages
from 110v, 120v, 220v and 240 Volts AC input.
Pioneer SA-9100 Original Specs:
Design type: 2 Channels, Integrated Pre / Class AB operation Power Amplifier. "2-Stage Differential Amplifier, Direct Coupled, Pure Complementary OCL"
Rated Power output:
60 WPC min RMS @ 8 Ohms &
75 WPC min RMS @ 4 Ohms and < 0.1% THD
across 20-20kHz (75Wpc and 100Wpc at 8 & 4 Ohms w/ 1kHz)
Damping
Factor:
>70
@ 20-20kHz into
8Ω THD & IMD; 0.1% at full rated power into 8Ω
w/ 20-20kHz @ 0.04% @ 1W
Freq
Response:
7Hz-80kHz at full
rated power /
Power Bandwidth = 5-40kHz
S/N:
>95dB
for 'Power Amp' inputs
Input Sensitivity Power Amp:
500mV @ 50k Ohms
PRE-AMP SECTION SPECS:
Pre-Amp Output (full
output): 2V
@ 8 Ohms
S/N:
93dB for Tuner, Tape
and AUX inputs
Input Sensitivities 'Tuner, AUX 1 and Tape'
inputs:
150mV / 100KΩ
Input Sensitivities AUX 2:
150mV
to 1.5V /
50kΩ
or 100kΩ
Microphone:
2.0mV
@ 50k Ohms
Mic input
Freq
Response: 10Hz-10kHz
Bass Control (main); ±10dB @ 100Hz
Bass Control (sub);
±6dB @ 50Hz
Treble Control
(main);
±10dB @ 10kHz
Treble Control (sub); ±6dB
@ 20kHz
Subsonic Filter: 8Hz,
12 dB/Oct Low Filter:
30Hz, 12 dB/Oct
High Filter:
8kHz or 12kHz,
12 dB/Oct
Loudness Control: +10dB @
100Hz (-40dB Vol Level)
Phono
Section: Freq
Response: 30Hz-15kHz w/
RIAA Equalization of ±0.3dB
S/N: >80dB w/
5mV signal input
Phono
1 / MM Sensitivity:
2.5mV / 50Ω
Phono
2 Sensitivity:
2.5mV-10mV /
25Ω,
50kΩ
or 100kΩ
Phono MM
Maximum Input Level: 250mV
RMS / 700mV P-P
Again, we have complete gone through and tested all functions of this
unit. The only thing we weren't able to completely
address, was the 'popping' on the 'Tone Defeat' and 'Filter Switches'.
We improved it to a tolerable level on the 'Filter Switches'. The 'Tone
Defeat' switch still pops, but as it's a switch that is typically 'set
and left', we did not want to invest the additional resources to
rectify, thus having to reflect it in higher final price. We felt that
was the best decision. Overall, the unit sounds incredible. This is
only the second of this model we have
had in 20+ years of being on the web! This is
an incredible amp and way better built and more versatile than most
we've seen marketed since it's 1973 introductory date. Internally
designed and built with very expensive, 5% & 1% tolerance resistors and
+/- 2% tolerance capacitors throughout! That was fairly 'unheard of' at
the time for most audio gear being generally reserved
for TOTL models. Our 'tech' first noticed that while doing it's
'workup' and made note on the worksheet, then we read about it in the
owners manual. Unit looks fabulous after detailing.
Original brushed aluminum face
and all original 'milled' aluminum knobs look near new.
Only 'barely mentionable' cosmetic issue are some small, 'moisture'
stains on the wood case top (see photos above). Real
Walnut Wood veneer case just had a fresh coat of Howards Feed-n-Wax and
looks great! Again, all functions test
perfectly after our service work and it sounds great!
Comes with an 'e-copy', PDF download of the
Pioneer SA-9100 owners / users / instruction manual and the service
manual if the purchaser desires. Measures
17" wide x 13.5" deep x 5.5" tall and weighs 34 lbs unpacked.
Comes with our 90 day limited warranty. PIONEER SA-9100 INTEGRATED STEREO AMPLIFIER
Cosmetic
Cond. 8.5+
SOLD 9/25/19
SHIPPED
TO JEREMY IN CALIFORNIA
(Cons. M.H.)
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details) |

NEW
LISTING
11/2018
(Click on above thumbnails to enlarge photos)
warranty
FULLY SERVICED / BENCH TESTED
HAFLER STEREO POWER AMPLIFIER HAFLER 9180
#...1277
Circa 1991-94
SOLD 3/2/19
SHIPPED TO BRIAN IN TEXAS
ü
Our technician has completely gone through and 'Certified' this unit
cleaning contacts, controls and pots.
ü
Amp has been cleaned inside
and out.
ü
We replaced the AC power
input jack.
ü
Internal fuses checked for correct values and
function
ü
Bias and DC offset set correctly.
ü
All functions have been tested and
pass with flying colors!
Amp designed using Huge Power Supply
Transformer and super quality (expensive) filter caps. Externally
located, vertically finned heat sink for very efficient and silent,
passive cooling of output devices (all amps /
receivers should be designed this way). This amplifier is in both great
electronic and physical shape. Looks LIKE NEW and sounds fantastic!
All inputs tested and both side produces clean and even sine waves!
No power supply hum of any kind. It's dead silent! Following
restoration procedures, we burned it in, in the shop at continuous
high volume for 8 hours straight and it functioned flawlessly.
Technician's note:
"this amp was final evolution of the DH-220's.
VERY good build quality"
On our test bench, this unit's (#...1277) amplifiers produced 32+
Volts at 8
Ohms per channel for 128
Watts / channel and 28+ Volts at 4
Ohms per
channel for 210 Watts / channel via
discrete output transistors (DC out adjusted to less than 9mV
per channel. Floor noise < 0.1mVAC. Idle AC current draw @ .86A) Great "general purpose" power amp for a variety of consumer and
Pro-Audio applications. Super quiet operation and build quality. We
run it's little brother in our main demo system and have for years.
Love it!!! Great for full range stereo speakers, Studio Monitors,
stage monitors, wedge monitors or running drivers in a Bi-Amp /
Tri-Amp system. For you 'tech-savvy' types, here's an excerpt from the
original manual regarding amp architecture and 'Mono-mode',
"The
input stage of the 9180 Amplifier utilizes four low-noise, High-g, JFET’s (high
trans-conductance junction field-effect transistors), in a fully complimentary,
symmetric configuration. This circuit configuration results in excellent
front-end headroom and a simple, straightforward connection to the remainder of
the circuitry. The ultra low noise characteristics of the JFET’s virtually
eliminates noise “mixing” (inter-modulation) with the
music signal, reducing discordant product frequencies known as “noise grain”, or
“noise fuzz”.
The input stage is cascade connected to convert the
low voltage input system to the high voltage output system, and
“speeds up” the front end for superior bandwidth. The cascade stage
is connected to an emitter-follower and current mirror configuration
that amplifies the current level about ten times, necessary to drive
the biasing string and final output stage driver emitter followers.
The final output stage uses multiple lateral MOSFET’s (Metal
Oxide Semiconductor Field Effect Transistors): four devices per
channel in the 9180. These devices, unlike conventional bipolar
transistors, have a negative temperature coefficient, which means
that they do not exhibit “thermal runaway”. Thermal runaway is a
phenomenon whereby a transistor heats up as it conducts more
current, which causes it to get hotter, and conduct more current,
and so on, until the device self-destructs. Since MOSFET’s are
inherently self-protecting, no sonically degrading, complex
circuitry is required to monitor and protect the output devices.
Furthermore,
these lateral MOSFET’s exhibit a very linear input to output
transfer function. Their connection in circuits and operating
characteristics are very similar to vacuum tubes, which is perhaps
responsible for their widely recognized sonic trait of being very
“musical” and non-fatiguing.
Conversion to
Mono Mode is accomplished by driving the negative input (feedback
point) of the right channel with the output of the left channel.
This causes the right channel to mirror exactly the output of the
left channel, but 180 degrees out of phase. This creates twice the
voltage swing to be available across the two red output binding
posts. This simple method of bridging the amplifier (involving only
one resistor) eliminates the costly and sonically degrading
invertors circuitry used in other amplifiers."
HAFLER 9180 FEATURES: - Stable down to 2 Ohms!* - Two Channel
or 'Bridged Mono' Operation -
Very Large Area dedicated to heat dissipation
via, Vertically mounted, external heat sinks
that cover 66% of the rear panel and almost 100% of each side. -
'Soft Turn-On / Turn-Off' protection against "turn-on / turn-off" transients - Thermal protection
for
amplifier
- Variable Input level controls on front panel
- RCA input signal I/O's, Gold Plated - Speaker outputs via
5-Way binding / banana posts -
Discrete output transistors
- Huge power transformer and filter capacitors
75V / 15,000μF Unit looks
near new, performs and sounds great!
HAFLER 9180 ORIGINAL SPECIFICATIONS
/ SPECS:
-Stable down to 2 Ohms!
(*in
certain circumstances
ie: limited times / frequency range /
power
output.
We
wouldn't recommend constant 2 ohm load
personally for very many amps)
Sensitivity (for 105 watts @ 8
Ohms): 1.4 VRMS
THD: 0.005% @ 1kHz, 0.025%
@
8 ohms, 20Hz - 20kHz Power Bandwidth:
0.3Hz to 116Hz
S/N: >100dB @ 105 Watts @ 8Ω un-weighted
Slew Rate: 50V / μsec
Damping Factor: >300
to 1k / 8Ω
& >200
to 10k / 8Ω
Input Impedance: 47k ohms unbalanced
Connectors (each channel): Input: RCA. Output:
5-way binding posts Cooling: Convection
(Vertically
mounted, external heat sinks, wrapping nearly 70%
of the way around the amp.)
Amplifier Protection: Full thermal
Speaker Protection:
'Soft Turn-On / Turn-Off'
Power Consumption:
100W @ 'quiescent' and 1200 Watts max
Rated Output Power (per channel):
Continuous Average Output Power Both Channels Driven: 8 ohms, 20Hz - 20kHz, 0.025% THD: 105
Watts
Again, we have completely gone through the
unit cleaning and testing all.
On our test bench, both amplifiers produce perfectly clean and
symmetrical sine waves at both 8 & 4 ohm loads.
Includes an 'e-copy' pdf download of the Hafler
9180 owners / users / instruction /
service manual.
Measures 17" wide x 12.5 deep x
4" tall and weighs
33 lbs
unpacked. Includes our standard 90 day limited warranty. HAFLER
9180 Cond. 9
SOLD 3/2/19
SHIPPED TO BRIAN IN TEXAS (Cons.) R.R. (Above
text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW
LISTING
1/11/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE SANSUI STEREO INTEGRATED AMPLIFIER
SANSUI AU-317 / AU317
#...0583
MIJ
"WORLD
AC POWER"
™
Circa
1978-80
SOLD 2/28/19
SHIPPED TO MARK IN CALIFORNIA
ü
Our
technician has completely gone through and 'Certified' this unit.
ü Everything was cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.
ü Internal fuses checked for correct value / function and replaced where
necessary.
ü Solder
joints reflowed on all possible high heat and stress points
ü Amplifier section had output bias and DC offset adjusted to spec
levels after 10 min warm-up.
ü All functions tested for perfect operation.
ü Following above procedures, unit was cosmetically detailed inside and
out.
ü
All inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
(Technicians note, "this is a very 'tech friendly & serviceable'
amplifier design")
Total tech time 5+ hours.
On our test bench, each internal amplifier of this particular unit,
#...0583, produced peak power
of 22
Volts per channel at 8
Ohms for 60
Watts per channel and 19
Volts at 4 Ohms
for 90 Watts per
channel via discrete, TO-3 / Metal
Cased output transistors (Sanken 2x 2SA745
& 2x 2SC1403).
AC Idle current at 200mA.
Bias set to correct 10.0mVDC. DC offset
adjusted to a SUPER LOW 0 mVDC L&R & floor
noise > -60dBm.
____________________________
Very
classy matte-black, Sansui AU-317 integrated amp. Huge, internal
power supply and 'REAL' output
transistors for lots of warmth and tone! Great, all-around
amp for home or project recording studio.
Sansui AU-317 Features include:
- True
Discrete Output, Class A/B amplifier
-
Speaker selector for A or B, A+B or Off
- Super quality de-tented volume control
- Separate Bass and Treble with high quality de-tented controls
- "Tone By-pass" for the purest signal path
- Loudness control. "Loudness" functions to boost Bass in
relationship to Mid frequencies at lower volume levels for a much
fuller sound
- Dual tape deck monitors with 'Tape-2'
having a DIN as well as RCA I/O's. (Tape Monitors can be used with Tape decks
such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape
Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® /
iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® CDR (CD recorders as
well as for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special Effects
units, Time Delays, etc)
- Phono input with un-filtered input
- Phono input with subsonic filter built-in to reduce turn-table
rumble
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3
/ iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs)
- Built-in High filter for reducing 19 kHz FM pilot tones and tape
hiss and AM noise
- AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.)
- Front mounted 1/4" stereo headphone jack
- 1/4" front mounted mic input with Mic Mixing control to combine
microphone signal with other input signals. Can you say "Instant
Karaoke"?. (be careful with your 'home audio'
speakers using an 'open / live' mic or any other 'un-compressed'
signals)
- Pre-Amp Out / Power-Amp in loop
- Back panel features full RCA patch bay for all inputs
- Also features "spring-clip" speaker connectors for A&B
- Triple AC convenience outlets with 2
Switched and 1 un-switched AC outlets for a maximum load of 400
watts of external gear.
-
True "WORLD
AC POWER"™
allows unit to be operated on 50 or 60 Hz AC and will select voltages
from 110v, 120v, 220v and 240 Volts AC input.
Sansui AU-317 Specifications:
Output: Continuous 50 Watts per
channel, min. RMS, at 8 Ohms both channels driven,
from 20Hz to 20kHz.
Design type:
2 Channels, Integrated Pre /
Class A/B operation Power Amplifier
Damping Factor:
>70@ 20-20kHz into
8Ω
THD: 0.03%
at full rated power into 8Ω
w/ 20-20kHz
Power
Bandwidth:
20Hz-20kHz
Frequency
Response at 1 Watt:
DC-200,000Hz
S/N:
110dB for Tuner, Tape
and AUX inputs
Bass Control: ±11dB
@ 50Hz
Treble Control: ±10dB
@ 15kHz
Subsonic Filter: -3dB @
13Hz & 6dB / Oct
High Filter: -3dB
@ 6dB / oct
@ 7kHz Loudness Control: +9dB @
50Hz & +7dB @ 10kHz
(-30dB Vol Level)
Input Sensitivities:
Non-Phono
inputs = 150mV
/ 47kΩ
Input Sensitivity Power Amp:
1V
/ 47kΩ
Tape outputs:
150mV
Pre-Amp
outputs:
1V
Microphone
Sensitivity Power Amp:
8mV
/ 47kΩ
PHONO SECTION SPECS: Freq
Response:
20Hz-20kHz w/ RIAA
Equalization of ±0.2dB
S/N:
>77dB
Input Sensitivity: 2.5mV @ 47kΩ
Phono Overload:
200mV but still
maintaining 0.008% THD
Again, as stated above, unit has been
completely gone through and certified. All
functions have been tested and pass with flying colors! No scuffs,
scratches, dings or dents. Face
and knobs are in beautiful condition. Unit looks NEW and sounds
great! Measures 17" wide x 13.25" deep x 4.5" tall and weighs 23 lbs
unpacked. Includes our standard 90 day
limited
warranty!
SANSUI AU-317
Cond.
8.5+
SOLD 2/28/19
SHIPPED TO MARK IN CALIFORNIA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
NEW
LISTING
11/2018
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED VINTAGE SAE
INTEGRATED STEREO AMPLIFIER
SAE TWO A7 #...3533 DUAL PHONOS, DUAL TAPE MONITORS AND EXTERNAL PROCESSOR LOOP Circa 1976-83 M.I.J.
SOLD 3/6/19
SHIPPED TO BENJAMIN IN NEW MEXICO
ü
Our
technician has completely gone through and 'Certified' this unit.
ü
Everything was cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.
ü
Internal fuses checked for correct value / function and replaced where
necessary.
ü
‘Multi-Voltage’ switch replaced and correctly set for North American
current.
ü
Solder
joints reflowed on all possible high heat and stress points
ü
Defective
'meter IC' replaced
ü
Amplifier section had output bias and DC offset adjusted to spec
levels after 10 min warm-up.
ü
All functions tested for perfect operation.
ü
Following above procedures, unit was cosmetically detailed inside and
out.
ü
All inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü
Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
On our test bench, each internal amplifier of this particular unit, #...3533,
produced peak power
of 26
Volts per channel at 8 ohms for
84 Watts per channel and
24 Volts at 4 ohms for
144
Watts per channel via discrete output
transistors. AC Idle current at
460mA. Floor noise 0.3mVAC.
____________________________
We don't get many SAE components in (other than my
'personal' units). This is a great amp for mid
sized audio systems at 70+ Watts per channel. Great for up to 12" woofer
systems. Loaded with 'usable' features as well. Looks and sounds great!
SAE TWO A7
Features Include:
- Discrete Output Transistors - A-B-A+B-& off speaker selector -
3-Band EQ w/ Separate Bass,
Mid and Treble - Tone Defeat selector for 'purest' signal path if desired - Super quality de-tented Volume control pot - Dual tape deck monitors (Tape Monitors can be used with Tape decks
such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape
Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® /
iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® CDR (CD recorders as
well as for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special Effects
units, Time Delays, etc) - Bi-Directional Tape Dubbing Capability with Source Monitoring - Dual Phono / Turntable inputs w/ built-in Phono Pre-Amp - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3
/ iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs) - Loudness control. "Loudness" functions to boost Bass in relationship
to Mid frequencies at lower volume levels for a much fuller sound - Built-in Subsonic Filter to eliminate excess rumble from sources such
as turntables - Instant -20db audio level muting - Pre-Amp out / Power Amp input loop allows you to
either inject an additional / external processor between the Pre and
Power, or to connect Pre-amp to another power amp, or to connect another
pre-amp to the power amp. - Front mounted 1/4" stereo headphone jack
- One of my favorite aspects, "Easy to use"
Speaker Connectors - Quad AC convenience outlets on rear panel
with 2 switched (550 Watts
combined) and 2 un-switched (100
Watts) for a total capacity of
650 Watts of
accessories.
Original
SAE TWO A7
Specifications:
POWER SPECIFICATIONS:
Power output: 70 WPC min RMS @ 8 Ohms &
no more than 0.05% THD @ 20-20kHz THD: no more than 0.05% THD @ 20-20kHz at full rated power
Speaker Impedance: 4 Ohms minimum
PRE-AMP
SECTION:
Signal / Noise Ratio: 95dB @ Tuner,
Aux, Tape A/B inputs Input Sensitivity AUX / Tape @ RCA's: 150mV @ 47kΩ @ 1kHz for
rated output Main Input @
AUX or TAPE:
>4V Output AUX / Tape @ RCA's:
150mV @ 47kΩ Bass Control: ±10dB @
100Hz Treble Control: ±10dB @ 10kHz
Subsonic Filter: >3dB @
30Hz, 6 dB/Oct Loudness Control: +8dB @
100Hz & 6dB @ 10kHz
(-30dB Vol Level)
PHONO SECTION SPECS: Freq Response:
RIAA
Standard Curve & ±0.3dB Signal / Noise Ratio: 74dB
Input Sensitivity: 2.5mV @ 47kΩ @ 1kHz for rated output
Max Input / Overload limit:
>150mV
Again, we have done the previously stated refurbishment / restoration
work on this unit to insure its performance, and it gets our full
'Certification'. All functions tested
for perfect operation. This unit is in essentially
great cosmetic condition! Performs and
sounds great! This is a very ‘musical’ sounding amp with lot’s of punch!
Includes
a pdf, 'e' copy, download of the SAE TWO A7 / A7e
service manual if the
purchaser desires. Measures
18.4" wide x 5.5"
tall x 13.75"
deep and weighs an impressive
24
lbs
unpacked. Includes our
standard 90 day limited warranty. Cond.
8.5 SAE TWO A7 Integrated Amplifier
SOLD 3/6/19
SHIPPED TO BENJAMIN IN NEW MEXICO
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW ADDITION
11/16/17
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED
VINTAGE ONKYO STEREO INTEGRATED AMPLIFIER
ONKYO A-7040
STEREO INTEGRATED AMP
#...0899
Circa 1979-81
MIJ
SOLD 12/15/18
SHIPPED TO TIM IN INDIANA
ü
Our technician has completely gone
through and 'Certified' this unit.
ü
Following both internal and external visual inspection, the entire
unit was cleaned out including all contacts, switches and controls.
Switches now clean sounding and performing fine.
ü Silicone
heat sink compound inspected for ‘suppleness’
ü Output
section bias / DC offset adjusted to factory spec.
ü All
functions tested for perfect operation.
ü All
inputs and functions tested.
ü Both
amplifier sides produce clean and even sine waves! No power supply
hum of any kind. It's dead silent!
ü Following
electronic refurbishing, the entire unit was cosmetically detailed
ü Following
restoration procedures, the unit was ran continuously at medium
volume, as all our amplifier / receivers are, into a 4 Ohm load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
While this amp was originally rated at 50 WPC
on our test bench the internal amplifiers of this particular unit,
#...0899,
produced 25 Volts
per channel at 8 Ohms for 78
Watts per channel and
21 Volts at 4 Ohms for
110 Watts
per channel via discrete, outputs (2x Toshiba 2SA1105
& 2x 2SC2580)
Idle current draw .75A
DC out measured following bench service at
only 1.2mV!!!
on either side
Very quiet with Floor noise measured at 0.0
mVAC.
____________________________
Great performing and 'classic' looking Onkyo
A-7040 Integrated Amplifier. Great unit to provide the heart
of a medium to mid-large sized Hi-Fi system. Unit looks, works and
sounds great!
Onkyo A-7040 Features include:
- Discrete Output, Class A-B Amplifier design
- Speaker A, B, A+B, Off selector
- Separate Bass and Treble controls featuring high-quality,
de-tented controls
-
I/O jacks and Speaker output posts feature 'Point
to Point' wiring, so connections are 'stress free' on the circuit
boards (all gear should be designed like this, but its 'too
expensive' for most of the general public now
- Dual tape deck monitors (Tape Monitors can be used with Video / CD
/ DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® /
iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for
inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special
Effects units, Time Delays, etc)
- Tape Dubbing Capability
- Dual Phono / Turntable inputs
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT /
MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.
inputs)
-
Hi filter for reducing tape hiss / electronic hiss &
noise-
and record static
- Loudness control. "Loudness" functions to boost Bass and Treble in
relationship to Mid frequencies at lower volume levels for a much
fuller sound
- 1/4" stereo headphone jack
- External Speaker protection fuses
- Dual AC Convenience outlets (1
switched and 1 un-switched) with a total capacity of
200 Watts
Original Onkyo A-7040 Specifications:
Design type: 2 Channel, discrete output, Class A-B
POWER AMP SECTION:
Freq Response of power amp section:
15Hz-50kHz
Damping factor: 45 @ 8Ω full
bandwidth
(means VERY TIGHT bass response)
Signal / Noise: 90dB
Cont rated Power: 2x 50 Watts @ 8 Ohms / 1kHz
THD: 0.026% @ 50Watts
& 8 Ohms from 20-20kHz
PRE-AMP SECTION:
Signal / Noise: 90dB @ Tuner / Tape 'shorted'
Input Sensitivity Tuner / Tape @ RCA's: 150mV @ 50kΩ
THD: 0.026% at rated ouput
Bass Control: ±10dB @ 100hz
Treble Control: ±10dB @ 10khz
Hi-Filter: 6kHz
& 6dB/Oct
Loudness Control: +5dB @ 100Hz & +5dB @ 10kHz(-40dB VOL)
PHONO
SECTION SPECS:
Freq Response:
20-20kHz ±0.5dB
S/N: >80dB!!!, IHF-A
Input Sensitivity: 2mV @ 50kΩ
Overload limit: 170mV @ 1k w/ 0.026%
THD
Again, as stated before, our technician has completely refurb'd this
Onkyo A-7040 Stereo Integrated amplifier,
cleaning and testing all and it gets our full 'Certification'.
All functions test perfectly. Great
integrated for just about any stereo
system from med to medium large speakers.
This is a fabulous amp. Sonically superb following our techs work.
Very musical. Lots of solid power / punch. Unit looks
good and sounds great! Can include a pdf
'e' copy of the Onkyo
A-7040 Service Manual if the new owner so desires. Measures 16.5"
wide x 15.7" deep x 5"
tall and weighs 21 lbs unpacked. Includes
our 90 day limited warranty.
Onkyo A-7040 Stereo Integrated amplifier
Condition 8.5
SOLD 12/15/18
SHIPPED TO TIM IN INDIANA
(Cons.) R.R.

We currently have
the 'matching' AM/FM Tuner on our 'Stereo Tuners' page
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|


(above left photo of amp with
'matching' tuner.
Sold separately)
NEW
LISTING
11/2018
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED
VINTAGE FISHER INTEGRATED STEREO AMPLIFIER
FISHER "STUDIO STANDARD" CA-7000 SERIES
FROM FISHER 'SYSTEM 7000' RACK #...5790
WITH 'MIC MIXING' Circa
1978-79 M.I.J.
SOLD 12/19/18
SHIPPED TO KYLE IN TEXAS
ü
Our
technician has completely gone through and 'Certified' this unit.
ü Everything was cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.
ü Internal
and external fuses checked for correct value / function and replaced where
necessary.
ü Solder
joints reflowed on all possible high heat and stress points
ü Amplifier section had output bias and DC offset adjusted to spec
levels after 10 min warm-up.
ü All functions tested for perfect operation.
ü Following above procedures, unit was cosmetically detailed inside and
out.
ü
All inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü
Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
On our test bench, each internal amplifier of this particular unit, #...5790,
produced peak power
of 21
Volts per channel at 8 ohms for
55 Watts per channel and
17 Volts at 4 ohms for
72
Watts per channel. AC Idle current at
230mA. Floor
noise < -60dBm.
____________________________
Great looking, Rack Mount, Silver-face,
Fisher Studio-Standard
CA-7000 integrated amplifier.
This is a great amp for mid
sized audio systems at 70+ Watts per channel. Great for up to 12" woofer
systems. Loaded with 'usable' features as well. Looks and sounds great!
Fisher
Studio-Standard CA-7000
Features Include:
- Dual VU power level meters showing both
dB's and Watts
- Externally located, Vertically oriented heat sinks (keeps output
'heat' outside of the amp housing, where it belongs)
-
Separate Bass,
Mid and Treble featuring high-quality,
De-tented pots - Super quality de-tented Volume control pot -
Separate Tape Monitor (Tape Monitors can be used with Tape decks
such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape
Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® /
iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® CDR (CD recorders as
well as for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special Effects
units, Time Delays, etc) - Phono / Turntable input w/ built-in Phono Pre-Amp - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3
/ iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs) - Loudness control. "Loudness" functions to boost Bass in relationship
to Mid frequencies at lower volume levels for a much fuller sound
-
Microphone input with 'Mixing Level' control (be
careful with your speakers using an 'open' microphone thru them) -
Range selector for Power Meters
- Externally located amplifier protection fuses - Front mounted 1/4" stereo headphone jack
- Rack-Mountable Fisher Studio Standard amp for Fisher racks (17.5" wide. This is not
'standard' rack width, which is 19") -
Triple AC convenience outlets on rear panel
with 2 switched (100 Watts
combined) and 1 un-switched (100
Watts) for a total capacity of
200 Watts of
accessories.
Fisher Studio-Standard CA-7000
Specifications:
POWER SPECIFICATIONS:
Power Bandwidth:
15Hz-40kHz
Power output: 42 WPC min RMS @ 8 Ohms &
no more than 0.3% THD @ 15-40kHz THD: no more than 0.3% THD @ 20-20kHz at full rated power
and 0.03% THD @
10 Watts output
Damping:
40 @ 8 Ohms Speaker Impedance: 8
Ohms minimum
PRE-AMP
SECTION:
Frequency
Response:
120Hz-20kHz
Signal / Noise Ratio: 85dB @ Tuner,
Aux, Tape A/B inputs Input Sensitivity AUX / Tape @ RCA's: 150mV @
35k Ω @ 1kHz for
rated output Output AUX / Tape @ RCA's:
150mV @ 47k Ω Bass Control: ±10dB @
50Hz Treble Control: ±10dB
@ 20kHz Loudness Control: +8dB @
100Hz & 4dB @ 10kHz
(-30dB Vol Level)
Microphone Input w/ 600 Ohm mic:
2.5mV/ 6k
Ohms
PHONO SECTION SPECS:
Freq Response:
RIAA
Standard Curve & ±0.3dB Signal / Noise Ratio: 75dB
Input Sensitivity: 2.5mV @ 50k
Ω @ 1kHz for rated output
RIAA Deviation:
RIAA
Standard Curve ±0.5dB
Again, we have done the previously stated refurbishment / restoration
work on this unit to insure its performance, and it gets our full
'Certification'. All functions tested
for perfect operation. This unit is in essentially
great cosmetic condition!
The only issue worth mentioning is there's some
light 'pitting' on the rack handles that is mostly noticeable when
you are caring or lifting the unit by the handles. Performs and
sounds great! This is a very ‘musical’ sounding amp with lot’s of punch!
Includes
a pdf, 'e' copy, download of the
Fisher Studio-Standard CA-7000
service manual
if the
purchaser desires.
Measures
17.75" wide x 5.5"
tall x 11.5"
(including rack handles) deep and weighs an impressive
24
lbs
unpacked. Includes our
standard 90 day limited warranty. Cond.
8.5
Fisher Studio-Standard CA-7000 Integrated Amplifier
(Cons.) R.R.
SOLD 12/19/18
SHIPPED TO KYLE IN TEXAS
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW
ADDITION
3/19/18
(Click
on above thumbnails to enlarge photos)
warranty
REFURBISHED / SERVICED
PRE-APPRECIATED KENWOOD POWER AMPLIFIER KENWOOD KM-206 / KM206 POWER AMP
'Military Market' / PX UNIT 600+ WATT MONSTER!!! #...0052 Circa 1985-86 MIJ
SOLD 7/26/18 SHIPPED TO MIKE IN WASHINGTON
ü
Our technician has completely gone through and 'Certified' this
unit.
ü
Unit
bench checked / tested.
ü
Amp
has been cleaned inside and out.
ü
Face
removed, meter illumination lens removed, cleaned and reattached.
ü
All
new panel illumination lamps replaced with new.
ü
All
functions have been tested and pass with flying colors!
Amp designed using Huge Power Supply Transformer and oversized,
vertical finned heat sink for very efficient and silent, passive
cooling of output devices. All inputs tested and both side produces
clean and even sine waves! No power supply hum of any kind. It's
dead silent! Following restoration procedures, we burned it in, in
the shop at continuous volume for 48 hours
straight and it functioned flawlessly. While this amp is originally rated at 150 Watts with both channels
driven (310W + 310W "Peak Music Power"), on our test bench, this
particular unit's (#...0052) amplifiers
produced 38 Volts at 8 Ohms per channel for
180 Watts /
channel and 26 Volts at 4
Ohms per channel for
169 Watts / channel via discrete output transistors (2x
Sanken 2SA1216 & 2x 2SC2922
/ 2274. (Idle AC current draw @ .4A. Floor noise measured at L= 00.0mVAC and R=00.0mVAC
/ -60dBm) Great, later model power amp by Kenwood. Model KM-206.
HUGE power output! Excellent for 2-channel (stereo) audio listening
or for use in an A/V system. Lots of punch and headroom. Kenwood KM-206 Features: - 2- Channel stereo operation - A or B speaker selector via high current relay
- Dual, Vertical, 7-Segment LED Power
Output Meters with Dual Position Level Selector - Built-in Protection circuit - LED Status indicators - Front-mounted 1/4" stereo headphone jack - RCA input jacks - Dual, vertical finned internal heat sink - Oversize power supply transformer - 3 Rear-mounted AC convenience outlets (2 switched and 1
un-switched for a total capacity of 200 Watts) Kenwood KM-206 Original Specs:
"150 Watts per channel minimum RMS, both channels driven @
8ohms, 20-20k, with no more than 0.03% THD" Design type:
2 Channels, AB operation Damping Factor: >35 @50Hz / 8 ohms
Signal / Noise: 120dB A weighted Rated RMS Output: 155
Watts per channel, min. RMS, @ 8Ω, both
channels driven, from 20Hz to 20kHz. Music Power 310 Watts + 310 Watts
THD: 0.03% at 'Full Rated Output'
/ 8Ω w/
20-20kHz 0.015% @ half rated power / 8Ω w/ 20-20kHz 0.001% @ half rated power / 8Ω w/ 1kHz
IMD: 0.002% @ rated power / 8Ω Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
Potential Frequency Response: 5Hz-200kHz Again, as stated before, our technician has completely refurb'd this
Kenwood KM-206, stereo Power-Amp, cleaning
and testing all and it gets our full 'Certification'.
Great 'all around' power amp for about any audio system. We have
sold MANY of this series of Kenwood power amps, with never a
complaint. Includes an 'e-copy' pdf download of the Kenwood KM-206
owners / users / instruction manual Unit looks, works and sounds
great! Unit measures 16.5" wide x 10.5" deep x 4.75" high and weighs
20 lbs unpacked. Includes our standard 90 day limited warranty. KENWOOD KM-206 Cond. 8.5++
SOLD 7/26/18 SHIPPED TO MIKE IN WASHINGTON
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW
LISTING
11/2018
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE
TECHNICS INTEGRATED STEREO AMPLIFIER
TECHNICS SU-V6X #...5A161
BIG POWER &
TONS OF INPUTS FOR A 'VINTAGE' UNIT Circa 1984-86
"WORLD
AC POWER"
™
M.I.J.
SOLD 12/24/18
SHIPPED TO STEVE IN CONNECTICUT
ü Our
technician has completely gone through and 'Certified' this unit.
ü Everything was cleaned inside and out including all switches, controls
and contacts. Cleaned and re-lubed all control shafts.
ü Internal fuses checked for correct value / function and replaced where
necessary.
ü ‘Multi-Voltage’ switch replaced and correctly set for North American
current.
ü Solder
joints reflowed on all possible high heat and stress points
ü Amplifier section had output bias and DC offset adjusted to spec
levels after 10 min warm-up.
ü All functions tested for perfect operation.
ü Following above procedures, unit was cosmetically detailed inside and
out.
ü All inputs tested and both sides produce clean and even sine waves into
static 8 & 4 ohm loads! No power supply hum of any kind. It's dead
silent!
ü Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifier / receivers are, into a load with
"Loudness" on and both Tone Controls at 10 for 48 hours.
On our test bench, each internal amplifier of this particular unit, #...A161,
produced peak power
of
34 Volts per channel at 8 ohms for
144 Watts per channel and
24 Volts at 4 ohms for
144
Watts per channel via discrete output
transistors (2X 2SA1301 & 2X 2SC3280). AC Idle current at
450mA. Floor noise
> -60dB.
____________________________
I used to sell Technics integrated amps (and most of
their other gear) when this unit was current. This one appears to be
designed for the Euro/Asia/Military market as the version I sold here in
North America didn't have as many inputs nor the 'impedance switch' if I
recall correctly. This is a great amp for mid
to larger
sized audio systems at 144+ Watts per channel. Great for larger woofer
systems as well. Loaded with 'usable' features as well. Works and sounds great!
TECHNICS SU-V6X
Features Include:
- Speaker Load Impedance selector on rear panel.
This is probably the most important feature of this amp (I wish all amps
had this). Allows 100% of the power to be utilized on speakers of only
8-16 Ohms, instead of 50-75% of power, which would be typical of most
amps / receivers. - Technics 'New Class A' amp architecture (reduces 'switching distortion
due to output transistors staying on throughout sine-wave) - Discrete
Output Transistors
-
Dual 71V
/ 15,000 uf power supply filter caps - A
(Main) -B (Remote) -A+B-& off speaker selector -
Separate Bass and Treble - Tone Defeat
(Straight DC) selector for 'purest' signal path if desired - Dual tape deck monitors (Tape Monitors can be used with Tape decks
such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape
Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® /
iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® CDR (CD recorders as
well as for inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special Effects
units, Time Delays, etc) - Phono / Turntable input w/ built-in Phono Pre-Amp - AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3
/ iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs) -
CD Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - TV / Video 1 Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) - TV / Video 2 Input (may also be used for Video / CD / DVD / LD / VCR / DAT /
MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader /
MP3 / XM® / SIRIUS® etc.) -
Graphic EQ loop allows you to
either inject an additional / external processor without 'chewing up'
one of the inputs - Record Out selector with bi-directional tape dubbing controls.
(Separate "Record Out" allows recording from one source while you listen
to another) (‘Record Out’ also allows the use of external signal
processors, such as EQ’s, to be used with ‘Tape-2’) - Loudness control. "Loudness" functions to boost Bass in relationship
to Mid frequencies at lower volume levels for a much fuller sound - Built-in Subsonic Filter to eliminate excess rumble from sources such
as turntables - Instant -20dB audio level muting - Front mounted 1/4" stereo headphone jack -
Triple AC convenience outlets on rear panel
with 1 switched 100
Watts and 2 un-switched (100
Watts ea) for a total capacity of
300 Watts of
accessories. -
True "WORLD
AC POWER"™
allows unit to be operated on 50 or 60 Hz AC and will select voltages
from 110v, 120v, 220v and 240 Volts AC input.
Original
TECHNICS SU-V6X
Specifications:
POWER SPECIFICATIONS:
Rated Power output:
100 WPC min RMS @ 8 Ohms &
no more than 0.003% THD and
0.007% @ 4 Ohms and across 20-20kHz THD: no more than 0.001% THD @ 20-20kHz at full rated power
SMPTE IMD: no more than 0.007% THD @
8 Ohms / 20-20kHz at full rated power
Damping Factor:
80 @ 8 Ohms and 40 @ 4 Ohms (TWICE what
many amps are rated at!!! Speaker Impedance: 4
Ohms minimum
PRE-AMP
SECTION:
Signal / Noise Ratio: 104dB @
"Line Level' inputs
(IHF '66 standard)
Input Sensitivity @ any 'Line Level' @ RCA's:
150mV @ 18kΩ for
rated output Output Tape Record @ RCA's:
150mV or EQ loop @ 18kΩ
Freq Response:
0.7Hz-140kHz
-3dB or 20Hz-20kHz -0.2dB
Bass Control: ±10dB @
50Hz Treble Control: ±10dB
@ 20kHz
Subsonic Filter: >3dB @
30Hz, 6 dB/Oct Loudness Control: +9dB @
50Hz & ~6dB @
~10kHz
(-30dB Vol Level)
PHONO SECTION SPECS: Freq Response:
RIAA
Standard Curve & ±0.5dB Signal / Noise Ratio:
88dB w/ 2.5mV input (IHF
'66 standard) Signal / Noise Ratio:
72dB
w/ 250μV
input (IHF '66 standard)
Input Sensitivity MM: 2.5mV @ 47kΩ for
rated output
(IHF '66 standard)
Input Sensitivity MC:
0.17mV @ 220kΩ
for rated output
(IHF '66 standard)
Max Input / Overload limit
MM: >170-210mV
(Frequency dependant) Max Input / Overload limit
MC: >12-15mV
(Frequency dependant)
Again, we have done the previously stated refurbishment / restoration
work on this unit to insure its performance, and it gets our full
'Certification'. All functions tested
for perfect operation. This unit is in
essentially
good cosmetic condition.
The 'worth mentioning' cosmetic issues would be that the silk screened
labels on the 'Input' buttons have partially worn off, so it's a bit
difficult to tell at first what buttons do which inputs. Obviously once
you got acquainted with their function you would be able to 'work
around' that. Performs and
sounds great! This is a very ‘musical’ sounding amp with lot’s of punch!
Includes
a pdf, 'e' copy, download of the
TECHNICS SU-V6X
service manual if the
purchaser desires. Measures
16.9" wide x 5.5"
tall x 14.9"
deep and
weighs an impressive
25
lbs
unpacked. Includes our
standard 90 day limited warranty. Cond.
8.5
TECHNICS SU-V6X Integrated Amplifier
SOLD 12/24/18
SHIPPED TO STEVE IN CONNECTICUT
(Cons.) R.R.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING
3/21/18
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE
PIONEER STEREO INTEGRATED AMPLIFIER
PIONEER SA-7800 / SA7800
'BATTLE WORN' COSMETICALLY, BUT
TECHNICALLY, A
NON-SWITCHING, 'CLASS-A LIKE' POWER HOUSE
#...3645S
Circa
1978-'80
MIJ
SOLD 6/12/18
SHIPPED TO MIKE IN MARYLAND
ü
Our technician has completely gone
through and 'Certified' this unit.
ü Following ext / int visual inspection entire unit was cleaned inside
and out including all contacts, switches and controls.
ü Bias adjusted to correct spec.
ü Meters calibrated per service manual.
ü Switches and controls now clean sounding and performing solidly.
ü All functions tested for perfect operation.
ü All inputs tested and both side produces clean and even sine waves!
ü No power supply hum of any kind. It's dead silent!
ü Following electronic refurb, entire unit was cosmetically detailed
(as it 'practically' allowed).
Classic brushed aluminum face plate
with the original aluminum
knobs (volume knob may be a replacement).
This unit does have a few 'battle scars'. Besides the fairly typical
'finish peel', there's some 'clouding' thru the finish on the meter
bezel, and some 'light spots' across the face plate that nothing
seemed to effect (It's not a 'beauty contest winner' but not
'offensive', see photo collage above).
Following 12+ hours of restoration
procedures, the unit was ran continuously at medium volume, as all
our amplifier / receivers are, into a 4 Ohm load with "Loudness" on and
both Tone Controls at 10 for 48 hours.
On our test bench the internal amplifiers of this particular
unit, #...3645S,
produced 26 Volts per channel at 8 ohms for
84 Watts per
channel and 23 Volts
at 4 ohms for 132 Watts per channel
via discrete outputs (2x 2SA1075 & 2x 2SC2525)
Idle current draw .3A.
DC out measured at <25mV on either side.
Very quiet with Floor noise measured at <00.1mVAC.
____________________________
Very
classy silver face / Blue Florescent power meter integrated amp.
Will match great with Pioneer Cassette Decks and Reel to Reel decks
utilizing their famous "Blue" meters.
Barring it's cosmetic blems
it's a Great amp for home or project
recording studio use.
Pioneer SA-7800 Integrated Amplifier
TECHNICAL Features include:
- 'Non-Switching'
amp utilizes 'super linear output transistors' with
'high range switching to reduce switching noise
distortion associated with many 'Class A-B' amp designs.
This essentially gives you Class-A sonics, but
without all the heat of a true Class-A amp design. It however
eliminates the 'switching noise' present in many "A-B" designs
(spelled out in detail in the original Pioneer SA-7800 sales
brochure, compliments of
www.hifi-manuals.com )
- 'DC 'Flat' Amp'
eliminates capacitors in the signal chain, thus
reducing 'lag' in the signal prior to hitting the power amp
- Gold plated Relay contacts in speaker protection circuit designed
to last a lifetime (and I can tell you that 'relay contacts' are an
'issue point' on many amps / receivers we service. If they were all
'gold plated' it would certainly save some 'headaches').
- Super thin cut heat-sink fins for more efficient cooling.
- Pure copper leads on many of the board mounted components (these
are not easy to source from a manufacturing standpoint typically)
- Tone Controls with a 'true bypass' when in
their '12:00 Noon' position (although there's also a 'Tone Defeat'
switch).
- Separately fastened RCA I/O jacks with 'point to point' internal
connections
Pioneer SA-7800 Integrated Amplifier Features
and 'Creature Comforts' include:
- Produces full power into only '8 Ohms' (most amps can only produce
their full power potential into 4 Ohms)
- DC surge and Short Circuit protection built-in
- Classic Pioneer, Dual Blue Florescent power meters
- Speaker selector for A or B, A+B or Off
- Subsonic filter with 15Hz cut-off built-in for cutting turntable
rumble
- Super quality de-tented volume control
- Tone Defeat for purest tone path if so desired
- Separate Bass and Treble with high quality de-tented controls
- Loudness function (boosts EQ on Bass and
Treble, while cutting mids for a fuller sound at lower volume
levels)
- 'Stereo / Mono' / Reverse Stereo selector
- Dual tape deck monitors (Tape Monitors can be used with Video /
CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® /
iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for
inserting signal processors, such as EQ's, Reverbs, Spatial
Enhancers / Dynamic Processors, Noise Reduction units, Special
Effects units, Time Delays, etc)
- Bi-Directional Tape Duplication
- Phono / Turntable input w/ 'Built-in' phono pre-amp
- 'Phono Interference Filter' reduces RFI from external sources
- Tuner input (may also be used for Video / CD / DVD / LD / VCR /
DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget /
eReader / MP3 / XM® / SIRUS® etc.)
- AUX input (may also be used for Video / CD / DVD / LD / VCR / DAT
/ MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3
/ XM® / SIRUS®, audio mixers, computer sound-cards etc.)
- Front mounted 1/4" stereo headphone jack
- -20dB Audio Muting
- Back panel features full RCA patch bay for all inputs
(each 'fastened separately' to the rear panel, and 'point to point'
wired internally, instead of being soldered directly to the circuit
board, which is always a 'failure point').
- "spring-clip" speaker connectors for A&B
speakers
- 2 Switched and 2
un-switched AC outlets for a maximum load of 400
Watts of external
gear.
Pioneer SA-7800 Original Specifications:
"Continuous
Power output of 65 Watts per channel, min. @ 8 Ohms from 20Hz to
20kHz @ <0.009%THD or
65 Watts per channel, min. @ 4 Ohms from 20Hz
to 20kHz @ <0.009%THD."
(15W more than the SA-708 @ 4 Ohms)
Design
type: 2 Channels, Integrated Pre /
Class AB operation Power Amplifier
Power Output: Continuous power output,
10Hz-50,000Hz:
65W/Ch THD 0.02% @ 8 Ohms
85W/Ch THD 0.03% @ 8 Ohms
Damping
Factor:
>55 @ 20-20kHz into 8Ω (15 more than the SA-708)
S/N:
110dB for 'non-phono' inputs
(10dB
more!!!
than the SA-708)
IMD: 0.003% at
half rated power into 8Ω
w/ 20-20kHz
Freq
Response:
10Hz-50kHz at full rated power
Input
Sensitivities 'non-phono' inputs for full rated
output:
150mV / 50KΩ via RCA's
Output at Tape Monitors:
150mV via RCA's
Bass Control: ±10dB @ 100Hz
(SA-708 is only 7.5dB cut / boost)
Treble Control: ±10dB @ 10kHz
(SA-708 is only 7.5dB cut / boost)
Subsonic Filter: -6dB / oct @ 15Hz
Loudness: +6dB @ 100Hz & +3dB @ 10kHz w/ vol set at -40dB
Input Freq Response range (non phono inputs):
5-100,000Hz
Phono
Section:
Freq
Response:
20Hz-20kHz RIAA EQ
S/N:
87dB
Phono
THD:
0.003% @ 1kHz
Phono
MM Sensitivity:
2.5mV / 50kHz
Phono
MM Maximum Input Level: 200mV
RMS while still maintaining 0.003% THD @ 1kHz
Again, as stated before, our technician has completely refurb'd this
Pioneer SA-7800 Integrated Stereo Amplifier, cleaning and
testing all and it gets our full 'Certification'.
Entire unit, including the original brushed aluminum, Face and knobs
are in beautiful condition. Unit looks beautiful and sounds great
with what the restoration tech called "Gutsy" power & punch! Just
FYI, this Pioneer SA-7800 has considerably better specs than it's little
brother, the SA-608 / SA-6800 and certainly it's
'alter ego' SA-708,
(check S/N, tone controls and damping factor particularly).
Comes
with an 'e' copy / pdf download of the original Pioneer SA-7800
owners / users manual and brochure if purchaser so desires.
Measures 16.5" wide x 14.75" deep x 6" tall and weighs 27.5 lbs
unpacked. Includes our 90 day limited
warranty!
Pioneer SA-7800 INTEGRATED AMP
Cond.
7.5-8 (due to cosmetic blems)
SOLD 6/12/18
SHIPPED TO MIKE IN MARYLAND
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING 12/12/19
(Click
on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE
AKAI REEL TO REEL TAPE DECK
AKAI X-1800SD (TYPE-C)
COMBO REEL / 8-TRACK CARTRIDGE 4-TRACK / 2-CHANNEL
STEREO or 4-TRACK /
1-CHANNEL MONO
AKAI's
"CROSS-FIELD™"
BIAS HEAD
3-SPEEDS 1/4" REEL TO REEL
BUILT-IN AMP AND SPEAKERS #...3198 "WORLD
AC POWER" ™
Circa 1970-72 for sale
|

NEW
ADDITION 11/9/17
(Click on above
thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY
SERVICED
VINTAGE PANASONIC 8-TRACK CARTRIDGE TAPE DECK
8-TRACK PLAY / RECORD DECK
PANASONIC RS-803US
WITH *FAST FORWARD! and
"AUTO STOP"
#...3669
MIJ
SOLD 4/1/18
SHIPPING TO CARLOS IN NEW MEXICO
ü
Our technician has completely gone through and 'Certified' this
unit.
ü We have
completely and extensively gone through the
mechanicals and electronics of this unit.
ü
Entire transport was disassembled down to the chassis, and every
mechanical part was cleaned of "varnished" lubes and re-lubed as
well as the always at issue, Pinch Roller plunge assembly, re-lubed
and reassembled.
ü
Main
drive belt has been replaced with NEW for trouble free service.
ü
Replaced bad track indicator lamps, and checked the
balance for function
ü
Capstan
flywheel
removed, cleaned, burnished and re-lubed prior to re-install. Entire
transport and mechanism has been cleaned, re-lubed and de-magnetized.
ü
Program
change mechanism and indicator contacts cleaned
/ burnished and re-lubed for trouble-free program changes.
All original program
indicator
lamps
now work fine.
ü
Heads
have been cleaned and de-magnetized and are in great shape.
ü Head
azimuth adjusted with alignment / test tape and
O-Scope for best High Frequency and channel to channel Signal Phase.
ü
Track alignment adjusted to
eliminate 'cross-talk' between tracks and to
ensure the best high-frequency response (not normally expected
from 8-track cartridge performance). Deck now
has clear sounding highs even when using pre-recorded tapes.
ü
Record
signal path contacts cleaned and burnished for
static-free performance.
ü
Linear
Record switch cleaned so no 'Motor Boating' effect
ü
Internal playback, meter and
record level pots also adjusted w/ O-scope.
ü
Speed initially measured at 97.75% accuracy. Following
refurbishment, Speed
checked with factory test tape to 99.8%
accuracy! (meaning in this case, that our 1000Hz test
tape plays back at 1002Hz on our Freq Counter Meter)
ü
Deck 'sonically' checked for WOW and Flutter with
no appreciable issues
ü
Record
Meters adjusted for 'even' readout and performance
ü
Floor noise tested to -60dB
Since we also burnished the program track light contacts, they all light
and are responsive. Unit works and sounds GREAT!
_____________________________
Records VERY well w/ 1kHz test tone on NEW Normal
Bias and / or Chrome Tape. This
machine would be perfect for burning your 8-track collection to CD.
Tape speed tested to 98.8% accuracy! Meters even w/ factory test tone
tape. Cosmetically there's a few minor dings / scuffs
around the face edge (mostly on bottom edge) and some brown 'paint' dripped on
the left side panel (we didn't try and remove as it's not offensive and didn't
risk damage to finish. See above photos). Deck looks good with only
minor scuffs, striations and works
GREAT!
_____________________________
Great quality 8-track cartridge play / record
deck. This is a great deck for transferring a large amount of tapes to
another media as it has two very important features. Momentary Fast
Forward and Auto Stop. These features are used to find the beginning of
track one without going past the beginning of the next track. Trying to
do a lot of transfers, as a business without those two features will
cost a lot of time / money!
Panasonic
RS-803US Features
include:
- Stereo Playback and Recording
- Back-lit, analog VU level meters
- Separate L & R Input level controls
- *Momentary
(non-locking) Fast Forward
- Auto-Stop
- 1/8" microphone input mounted on the front panel
- 1/4" Stereo Headphone jack
- Rear mounted RCA I/O's
Again,
have completely gone through it making ready for playback for listening
to or burning your collection. Great for burning your tape collection to
another media or for recording new 8-tracks from CD or iPod for your
classic Muscle Car. Looks good and works GREAT! Includes our standard 90
day limited warranty. Measures 16.75" wide x 9.5" deep x 4.5" high and
weighs 11 lbs unpacked.
PANASONIC
RS-803US
Cond. 8.5
SOLD 4/1/18
SHIPPING TO CARLOS IN NEW MEXICO
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING
10/23/18
(Click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY
SERVICED VINTAGE
REALISTIC 8-TRACK REALISTIC MODEL TR-802
/ CAT # 14-928 8-TRACK DECK WITH DOLBY #...2588
Circa 1978-82
SOLD 3/21/19 SHIPPING TO BILL IN ILLINOIS
ü
Our technician has completely gone through and 'Certified' this unit
cleaning inside and out, cleaning out ‘gelled’ lubes (a ‘MUST DO’ on all
pre-owned / vintage tape decks) and re-lubricating mechanism, investing
over 5.5 hours of tech time

ü
Nylon
head clamp has been repaired (most decks utilize a 'nylon' head mount,
and we haven't seen one in a LONG time that hasn't been cracked,
allowing the head to 'droop'. This MUST be addressed, or the head would
never align to the tape).

ü
Heads
have been cleaned and entire transport has been de-magnetized.
ü
Main
drive belt has been reconditioned for trouble
free service.
ü
Internal,
linear record switch flooded with cleaner to eliminate 'motor boating'
and other common issues.
ü
Track
indicator contacts burnished.
ü
All track
indicators function.
ü
Head
elevator cleaned and re-lubed.
ü
Capstan
bushing cleaned and re-lubed.
ü
Defective 'Left VU Meter'
replaced w/ another OEM unit
ü
Head
azimuth & track cross-talk adjusted for optimum performance and the best
high-frequency response (not normally expected from 8-track cartridge
performance) utilizing RCA #356 and 8TSC-101, Aspen
'Deck Tester' and Audio-Tex 30-312 Test / Alignment tapes, a dual trace Oscilloscope
and frequency counter.
ü
Internal
PB, REC and METER PC Pots cleaned and adjusted for 0dB with
Oscilloscope.
ü
Floor
noise measured to 0.3mVAC.
ü
Speed
checked at 98.4% accuracy! (1k = 1016Hz)
ü
Checked
for 'WOW' and 'Flutter' by recording test tones and dynamic piano cuts.
Piano even sounds fairly decent and that's a
difficult thing to do with an 8-track 'cartridge' tape deck.
ü
Deck has
clear sounding highs even when using pre-recorded tapes. This machine
would be perfect for burning your 8-track collection to CD
or making tape for your 'Antique Muscle Car'.
One issue
with every TR-802 / 803 we've had (and we've had quite a few) is they
always have non-functioning, non-repairable tape counters. They have an
inherent issue with a small nylon gear around a steel shaft that after
30 years, cracks, thus locking it up every revolution. The same thing
happens to many Pioneer and Craig 8-tracks, as well as a few others
(since the tape counters were primarily made by one company for most
electronics mfg's to use). There are two types of Realistic TR-802/803
8-track tape counters; those that have
already have cracked gears and those that are just about ready to have
cracked gears. The "work-around" for this is to remove the linkage belt,
and cover the tape counter opening.
ü
Looks
good and other than the above mentioned tape
counter, ALL works GREAT!
_____________________________
Great quality 8-track cartridge play / record deck. We recorded from a
CD onto a new 8-track cartridge and it sounded as good as a cassette and
many Reel to Reels! Quality tape transport. Great for making "new" 8-track tapes for listening in your vintage or
muscle car. All functions work great.
REALISTIC MODEL TR-802
FEATURES:
- User adjustable
Crosstalk / 'track alignment' on bottom panel
for tape cartridges that don't line up correctly (instead of inserting a
book of matches under the tape like we used to always do) - User adjustable Azimuth on bottom panel
for tweaking the 'top end / treble' on different tape cartridges that don't line up correctly
- Locking Fast Forward (2.5x speed)
- Auto-Stop after each tape or at end of each track or Continuous play.
Invaluable, Time / Money Saving
feature when archiving large 8-track libraries. This
feature coupled with a "Locking" Fast Forward are must haves for that
use. Auto-Stop works on 'record' as well.
- Repeat & Pause Lock
- Dolby Noise Reduction for Recording and Playback (if desired)
- Front-mounted, separate Left and Right level controls the input
recording signal - Power-assist Eject feature
- Output playback level control on the rear panel to match audio level
precisely to your playback equipment inputs - Dual "Glide-Path"®
Tape Record Level Controls
- Dual,
analog VU level meters
- Dual ¼" microphone inputs mounted on the front panel
REALISTIC MODEL TR-802 SPECS:
Track
system: 8-track, 2-channel stereo tape deck Motor: 1 Synchronous
Transport Control Type: Mechanical: Fast Forward, Play
S/N W/
Dolby: 55dB
Input
Sens on Mic: 0.3-30mV
Input
Sens on AUX: 100-300mV
Output
Level: 0.775V
Tape
speed: 9.5 cm/s (3-3/4 ips)
Wow &
Flutter: >0.2% @ 3-3/4ips Frequency response:
50Hz to 12,000Hz (± 3dB @ 3-3/4ips)
Again, unit looks and works great and is ready to use!
(Tape
cartridge shown in photos not included with deck).
Cosmetically about the only thing worth mentioning is
a light, 'wiggly' scratch on part of the face plate (see photos above).
Includes
our standard 90 day limited warranty. Measures 16.5" wide x 10.5" deep x
5.25" high and weighs 9 lbs unpacked. REALISTIC TR-802 / 14-928 Cond. 8
SOLD 3/21/19 SHIPPING TO BILL IN ILLINOIS
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
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BEST DEAL! 10 TAPES!
NEW LISTING 2/4/17 10-Pack ONCE OR TWICE
RECORDED REEL TO REEL TAPE REALISTIC / RADIO SHACK 'CONCERTape' 1800 ft / 548.6m 1.0 MIL 'POLYESTER' TAPE IN THE 'WHITE' BOX 7" x 1/4" Tape Cat # 44-1018A 'Low Noise' / Normal Bias
for sale
Pre-Recorded,
1/4" X 7" (18cm),
Realistic / Radio Shack, 'CONCERTape', 1800 ft
reel to reel tape. Great tape for
general purpose recording.
These are 1800' / 548.6 meters and 1.0 MIL thick, and include
individual, boxes with a plastic reel. More than enough length for most
LP's at 7.5ips (fast, consumer speed) for 90 minutes combined sides (180
minutes at 3.75ips). According to an original catalog, "1-Mil
base of heavy-duty Polyester resists breaking and stretching while
giving you extra-wide response."" Will
work on any 'head format', meaning 'quarter track', 'half-track',
'full-track', '4-track / '8-track' / 'multi-track', stereo or mono tape
recorders / decks.
Reels are 'light gray' plastic. Leaderless tape. We have actually found that 'Normal' bias tape works best on the older
decks such as the pre 1980 Akai's, Concertone's, Craigs, Crowns, Grundigs, Kenwoods, Pioneers, Realistics, Sansui's, Sony TC's, TandBergs,
Teacs, Telefunkens, etc. We have gotten
some fine recordings using this tape, and due to the extreme 'retention'
of high bias tape some times it is difficult to erase. These always seem
to erase fine. Most are at least 1800 feet and some with leaders intact
and may or may not include individual box
(often do). Most have been used and will have recordings on
them. Boxes and / or reels may have extraneous labels and /
or marking on them. Reels may have blemishes / nicotine staining / dust
etc. You will need to come up with your own labels as even if they are
in the box, they likely aren't "sticky" anymore. Due to
unpredictability of stocks we cannot "cherry pick" brands so
they are always assorted. Plastic reels may be clear or black.
Will work on any 'head format', meaning 'quarter track', 'half-track',
'full-track', '4-track / '8-track' / 'multi-track', stereo or mono tape
recorders / decks. Use
a bulk eraser or will simply erase when new recordings are made on your
deck (assuming your 'erase' is functioning). Used and likely recorded 10-pack- $99.99 shipped*
NOW Includes
A FREE Empty 'Take-Up' Reel
OR We can also do a "Bulk erase" on your tapes for an additional
$2.00 ea. Used and Erased 10-Pack $119.99 shipped*
NOW Includes
A FREE Empty 'Take-Up' Reel
VERY LIMITED SUPPLY
CURRENTLY IN STOCK
*Shipping within the United States is
included in price. For other shipping destinations, please call or email for shipping cost.
800-806-4231 ext 2 for
sales, 10:00AM to 5:30PM MTN (Colorado, USA) time.
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OUR MOST POPULAR PACKAGE
(photo of random reel to reel tape,
and not necessarily representative of any brands / models included in 13
pack)
"BAKERS DOZEN"
13 + TAKE-UP Reel-To-Reel Tape Normal Bias 7" x 1/4" Tape
IN BOXES / STORAGE CASES
for sale
Pre-Recorded
1/4" X
7", Normal Bias /
Regular Bias Reel-to-Reel tape. "Grab-bag"
assortment of brands may, but not necessarily include Ampex,
BASF, Irish, Kodak, Realistic, Scotch / 3M,
Sony, Soundcraft, and
others. We have actually found that 'Normal' bias tape works best on the older
decks such as the pre 1980 Akai's, Concertone's, Craigs, Crowns, Grundigs, Kenwoods, Pioneers, Realistics, Sansui's, Sony TC's, TandBergs,
Teacs, Telefunkens, etc. We have gotten
some fine recordings using this tape (also, due to the extreme 'retention'
of high bias tape some times it is difficult to erase). Normal
Bias tapes always seem
to erase well. Most will be at least 1800 feet and some with leaders intact
and will come in either a box or storage case. Most have been used and possibly
have recordings on
them. Boxes and / or reels may have extraneous labels and /
or marking on them. Reels may have blemishes / nicotine staining / dust
etc. You will need to come up with your own labels as even if they are
in the box, they likely aren't "sticky" anymore.
Leaders may or may not be intact, and even if they are, their splices
may give way and need to be re-spliced.
Due to
unpredictability of stocks we cannot "cherry pick" brands so
they are always assorted. Plastic reels may be clear or black.
Will work on any 'head format', meaning 'quarter track', 'half-track',
'full-track', '4-track / '8-track' / 'multi-track', stereo or mono tape
recorders / decks. Use
a bulk eraser or will simply erase when new recordings are made on your
deck (assuming your 'erase' is functioning). We also will
ensure that the reels you receive are 'crack / split free'.
Used and likely recorded 13-pack $119.99 shipped*
NOW Includes
A FREE Empty 'Take-Up' Reel
OR We can also do a "Bulk erase" on your tapes for an additional
$2.00 ea. Used and Erased 13-Pack $145.99 shipped*
NOW Includes
A FREE Empty 'Take-Up' Reel
*Shipping within the United States is
included in price. For other shipping destinations, please call or email for shipping cost.
800-806-4231 ext 2 for
sales, 10:00AM to 5:30PM MTN (Colorado, USA) time.
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ENOUGH FOR A FEW '10-PACKS'
JUST BACK IN STOCK
(photo of random 'high bias' tape,
and not necessarily representative of any brands / models included in 10
pack) High Bias (Chrome) 7" Reel-to-Reel 1/4" Tape 10-Pack Used 7",
HIGH Bias / CHROME Reel-to-Reel tape. "Grab-bag"
assortment of brands may include Ampex,
BASF, Irish, Maxell, Realistic, Scotch / 3M,
Sony, Soundcraft, TDK and
others. Most are at least 1800
feet and some with leaders intact
and may or may not include individual box
(often do). Most have been used and will have recordings on
them. Boxes and / or reels may have extraneous labels and /
or marking on them. Reels may have blemishes / nicotine staining / dust
etc. You will need to come up with your own labels as even if they are
in the box, they likely aren't "sticky" anymore. Due to
unpredictability of stocks we cannot "cherry pick" brands so
they are always assorted. Plastic reels may be clear or black.
Will work on any 'head format', meaning 'quarter track', 'half-track',
'full-track', '4-track / '8-track' / 'multi-track', stereo or mono tape
recorders / decks. Use
a bulk eraser or will simply erase when new recordings are made on your
deck (assuming your 'erase' is functioning).
Plastic reels may be clear or black.
Used and likely recorded 10-pack $99.50 shipped*
NOW Includes
A FREE Empty 'Take-Up' Reel
OR We can also do a "Bulk erase" on your tapes for an additional
$2.00 ea. Used and Erased 10-Pack $119.50 shipped*
NOW Includes
A FREE Empty 'Take-Up' Reel
VERY LIMITED SUPPLY
CURRENTLY IN STOCK
*Shipping within the United States is
included in price. For other shipping destinations, please call or email for shipping cost.
800-806-4231 ext 2 for
sales, 10:00AM to 5:30PM MTN (Colorado, USA) time.
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HEY, WHY ALL THE 'X'd' OUT /
OMITTED SPECS AND TEXT?
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Yes, we know, EVERYTHING (at least all the receivers)
are OUT
currently.
We will be posting more in the future.
We are currently focusing resources on expanding our receiver 'Parts
Department' AND 'refurbished' stereo receivers sell faster than we can get them
refurbished, and it's a slow process getting them ready.
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