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CLASSIC 2 & 4-CHANNEL STEREO RECEIVERS . . .
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NEW LISTING 5/10/13
(Click
on above thumbnails to enlarge photos)
warranty
VINTAGE PIONEER STEREO RECEIVER
THE CLASSIC PIONEER SX-950
BIG POWER AND SIZE!
Circa
Late 1976 / Early 1977-78/79
MIJ
for
sale
ü
Our technician has completely gone through
and 'Certified' this unit.
ü
Everything was cleaned inside and out including all contacts, switches
and controls.
ü
Power switch replaced with original Pioneer OEM part
ü
Volume potentiometer replaced with original Pioneer OEM part
ü
Voltage selector switch replaced
ü
Skewed control shafts straightened
ü
Electrolytic power supply filter capacitors tested for leakage
ü
All 4 power transistors removed, tested for leakage
ü
Shorted / bad output transistors replaced with ‘new’ TO-3’s
ü
All transistors re-installed with fresh heat-sink compound (usually good
for 20-30 years)
ü
Bias current adjusted to correct levels.
ü
DC offset adjusted to correct levels.
ü
We also aligned the tuner for optimum AM & FM performance as older
internal tuner components have always drifted on vintage gear over the
years.
VERY GOOD TUNER!
AM reception
WAY
above average, FM reception incredible, PUNCHY and
IMPECCABLY CLEAN!!!
due
to the 'Pair of Dual-Gate MOS-FETS'
FM front end and the quality of the restoration.
ü
All meter, dial, function indicator and FM stereo indicator lamps
replaced for trouble-free service (dial / meter lamps ‘blue tinted’ to
original color)
ü
Entire unit cleaned / detailed cosmetically inside and out. Only
cosmetic issues with this unit are some scratches /
scuffs on the face plate and AM button.
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! All functions test fine.
ü
Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifiers / 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 time investment ~9 hours.
On our
test bench, the internal amplifiers of this receiver #...1405
produced 29 volts per channel @ 8 ohms with
1Khz input for 105 watts and
24 volts per channel @ 4 ohms with 1Khz input
for 144 watts via discrete, TO-3, metal cased
outputs. (2x 2SB557 & 2x 2SD427).
AC Idle current at 750mA,
Bias adjusted and
DC offset
output adjusted to 0 mvDC either channel
(yes, you read that right '0' as in 'ZERO' DC!!!) Floor noise
@ <1mVAC either channel.
____________________________
This was from what most people, especially 'techy'
types, consider Pioneers 'pinnacle' series of models, and this one is
the Pioneer SX-950! During this time, Pioneer
had the 'BIGGEST / BADDEST' RECEIVER offered
by anyone in it's time (yes, there were larger receivers
than what Pioneer was offering later,
but not for 1976 / early '77). Classic looking
brushed-aluminum silver face and encased in a real wood Walnut veneer
cabinet with solid Walnut wood corner caps. These are SERIOUS receivers
and this one has been 'certified'
following the refurb by Oak Tree Vintage and is in
great
condition!!!
Pioneer SX-950 Stereo Receiver Features:
Tuner features:
- Weighted flywheel analog "slide-rule" tuning
- FM Muting Selector (separate from the 'Stereo' selector)
- Dual analog 'Signal Strength' and 'Tuning' VU meters
- FM Detector / 4-channel RCA output
- Dual position FM De-emphasis selectable for 25 or 75 msec
Pre-Amp / 'Control Amplifier' features:
- A, B, C, Any combination of 2 & Off speaker selector
- Dual-Band EQ w/
selectable 'centers' (Bass controls centered at
200 or 400 Hz and
Treble @ 2.5 or 5kHz)
- Tone Defeat for purest signal path
- Super quality de-tented Tone and Volume controls
- "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 entire pre-amp section, not just FM tuner)
- Hi filter for reducing tape hiss / electronic hiss & noise and record
static
- Built-in 'Low' Filter to eliminate excess rumble from sources such as
turntables
--20dB Audio Muting for instant lowering of volume without adjusting the
volume control. Great for ringing phones and cuing a record on your
turntable
Inputs:
- Dual Phono / turntable inputs with Built-In
Phono Pre-Amps
- Dual tape monitors with Tape monitor 'B' also featuring a DIN input as
well as the standard RCA I/O's
(Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT /
MP3 / iPod® / 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 'Dubbing' capability
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Dolby 'Adaptor' Loop can be used as an additional input or as a
signal processor loop for EQ, Dynamic Range Expanders, Reverbs, Delays,
DBX units, etc.
- 1/4", stereo headphone jack
- Dual Phono inputs with phono 2 doubling as dual Microphone input
- 1/4" front mounted Microphone input
Other:
- Pre-out / Main-in loop
- 3 AC outlets (1 switched / 2 un-switched) with
a total capacity of 300 watts
Original Pioneer SX-950 Specifications:
"The SX-950 has a continuous power output of
85 watts per channel min @ 8 ohms &
110 wpc @ 4 Ohms, from 20 hertz to 20,000
hertz with no more than 0.1% THD (measured utilizing AUX input)"
POWER / PRE AMP SPECIFICATIONS:
THD:
0.1% @ 85 wpc @ 8 Ohms & 0.05% @
43 wpc @ 8 Ohms
Freq Response of power amp section:
@ full rated power 20-20kHz
Potential frequency response of power amp section @ 1w:
7 Hz to 90KHz, + 0
dB,- 1 dB
IMD utilizing AUX: 0.1% @
85 wpc
Hum / Noise Ratio: 100dB
Damping factor: 25 @ 8Ω full bandwidth
Power Amp Input Impedance: 50k Ohms
Power Amp Input Sensitivity for Full Output: 1V
Tone Control ranges:
Bass: +/-10dB @
200Hz or 400Hz
Treble:
+/-10dB @ 2.5kHz
or 5kHz
Hi Filter: 6 KHz,
6dB/octave
Lo / 'Sub' Filter: 30Hz,
6dB/octave
Loudness Contour w/ vol
@-40dB: + 6dB at 100 Hz, + 3dB at 10KHz
Pre-Amp Input Impedance:
50k Ohms
Pre-Amp Input Sensitivity at all
inputs except phono & mic: 150mV
Microphone Input Impedance: 50k Ohms
Microphone Input Sensitivity at all inputs except phono & mic: 6.5mV
Input Freq Response (except Phono & Mic): 15-40kHz
Tape Output Impedance: 80k Ohms
Tape Output: 150mV @ RCAs & 30mV @
DIN
Pre-Amp Output Impedance & Level:
1V / 1k Ohms
Pre-Amp THD @ rated output:
<0.05%
Pre-Amp S/N @ 'Tape' & 'AUX':
90dB
TUNER SPECS FOR FM:
Freq Response: 30-15kHz per FCC Regulations
S/N: > 72dB Mono @ 65dBf
S/N: > 67dB Stereo @ 65dBf
Useable Mono RF Sensitivity dBf / μV: 10.3dBf
/ 3.6μV
Useable Stereo RF Sensitivity in dBf / μV:
22.2dBf / 14.1μV
Capture Ratio: 1.0dB
Signal for 50dB quieting, Mono dBf / μV: 17.2dBf
/ 8.0μV
Signal for 50dB quieting, Stereo dBf / μV: 38.0dBf
/ 87μV
De-Emphasis: selectable 25 or 75 μ-sec
THD w/ 100% modulation @ 1kHz, Mono: 0.15%
THD w/ 100% modulation @ 1kHz, Stereo: 0.3%
IF Response Ratio: 100dB
Stereo Sub-Carrier Rejection: 62dB
AM Carrier Rejection / Suppression
ratio: 55dB
Spurious Rejection: 100 dB
Image Response Ratio: 85 dB
FM Alternate Channel Selectivity: 80dB
Muting Threshold dBf / μV: 14dBf /
5.5μV
Stereo Separation: 40dB @ 1kHz or 30dB
@ 30-15kHz
TUNER SPECS FOR AM:
RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity: 40dB
IF Response Rejection Ratio: 85dB
Image Response Rejection Ratio: 65dB
Signal to Noise Ratio: 55dB
PHONO SECTION SPECS:
Freq Response: 30-15kHz
S/N: 75 dB, ref w/ 10mV input
Input Sensitivity: 2.5 mV @ 50kΩ
Overload limit: 200 mV @ 1kHz
Most
techs, including myself, who have been inside of both the SX-xx50 series
and the SX-xx80 series, can see quite a few examples of why they believe
the xx50 series is better built than the later xx80 series. Yes you get
power meters on the xx80 series, but on the 50 series you get TO-3,
metal cased outputs, shielding around the control pots and some
sensitive circuit boards to reduce RFI noise, heavier control pots and
Molex connected pre-driver / output circuit boards to facilitate future
service. While the SX-xx80 series is far and above most audio units
manufactured in the last 20-25 years, you can just tell that Pioneer
figured out how to "save a few bucks" on the newer 80 series.
Again, we have completely gone through this
Pioneer SX-950 Stereo Receiver, as stated
above and 'certified'
it's ready to go!
Cosmetically, the real wood Walnut cabinet on this one is in
great condition. Face is
clean with only a bit of typical wear to the top edge
and a few light scratches around and on the sides of the 'AM' push
button! Unit looks great and sounds HUGE! This is truly one of
'THE ONES' when it comes to CLASSIC STEREO
RECEIVERS! Includes 'e' copies of the original Pioneer SX-950
owners / users / instruction manual, and brochure. Measures 20.75"
wide x 16.25" deep x
6.75" high and
weighs a HEAVY
43 lbs unpacked.
Includes our standard 90 day limited warranty!
PIONEER SX-950 STEREO RECEIVER
Cond.
8.5
$949.
(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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Did you know?
While
the company 'Pioneer' was officially established in 1961, the founder was
actually developing speakers as early as 1937. In 1962 Pioneer marketed the
worlds first 'separate component' stereo system for the home, and in 1975,
the worlds first 'component system' for the car. In 1984 they introduced the
first CD player for the automotive use (and I was selling it then). Pioneer
had many other 'firsts' and continue to be a major 'player' in consumer,
professional and industrial electronics.
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NEW LISTING 5/10/13
(Click
on above thumbnails to enlarge photos)
warranty
VINTAGE SANSUI STEREO RECEIVER
THE CLASSIC SANSUI G-7700X
BIG POWER AND SIZE!
Circa
1980-82
#...0827
"WORLD
AC POWER"
™
MIJ
SOLD 5/17/13
SHIPPING TO SOUTH DAKOTA
ü
Our technician has completely gone through
and 'Certified' this unit.
ü
Everything was cleaned inside and out including all contacts, switches
and controls.
ü
Skewed control shafts straightened
ü
Electrolytic power supply filter capacitors tested for leakage
ü
All 8 power transistors removed, tested for
leakage
ü
All transistors re-installed with fresh heat-sink compound (usually good
for 20-30 years)
ü
Intermittent ground painstakingly located and corrected
ü
Numerous component connections re-flowed
ü
Bias current adjusted to correct levels.
ü
DC offset adjusted to correct levels.
ü
We also aligned the tuner for optimum AM & FM performance as older
internal tuner components have always drifted on vintage gear over the
years.
VERY GOOD TUNER!
AM reception WAY above average, FM reception incredible, PUNCHY and
IMPECCABLY CLEAN!!!
due
to the super quality FM front end and the
quality of the restoration.
ü
All dial indicator lamps replaced for trouble-free service (dial / meter
lamps ‘blue tinted’ to original color)
ü
Entire unit cleaned / detailed cosmetically 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! All functions test fine.
ü
Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifiers / 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 time investment ~10
hours.
On our
test bench, the internal amplifiers of this receiver #...0827 produced
38 volts per channel @ 8 ohms with 1Khz input for 180 watts and 34 volts
per channel @ 4 ohms with 1Khz input for 289 watts via discrete outputs.
(2x 2SA1106 & 2x 2SC2581).
AC Idle current at 500mA, Bias adjusted and DC offset output adjusted
to <2 mvDC either channel. Floor noise @ <0.2mVAC either channel.
____________________________
This is one of the dozen or so, largest 'receivers'
we have had. At 4 ohms, a single channel was able to produce
289 Watts!!!
Great looking, 'Silver-face'
Sansui G-7700 Stereo Receiver. Combines a
classic 'Analog/Slide-Rule' tuner w/ digital
tuning style display. These units have super quality feeling controls,
exceptional tuners and fabulous sonics after restoration. One very smart
feature of this model is the rear-mounted and externally located, full
width heat sink module to keep the units power amps running cool. All
units should follow this lead for much longer life, cooler running and
lower distortion.
.
These are great receivers and this one has
been 'certified'
following the refurb by Oak Tree Vintage and is in
great
condition!!!
Sansui G-7700 Stereo Receiver Features:
Tuner features:
- Weighted flywheel analog "slide-rule" tuning w/
'Digital Readout' as well
- "Quartz Locked" tuning with LED indicator to reduce station drifting
- FM Muting Selector (separate from the 'Stereo' selector)
- Fluorescent 'Signal Strength' and 'Tuning'
meters
- Dual position FM De-emphasis selectable for 25 or 75 msec
Pre-Amp / 'Control Amplifier' features:
- A, B, A+B & Off speaker selector
- Dual-Band EQ
- Tone Defeat for purest signal path
- Super quality de-tented Tone and Volume controls
- "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 entire pre-amp section, not just FM tuner)
- Hi filter for reducing tape hiss / electronic hiss & noise and record
static
- Built-in 'Low' Filter to eliminate excess rumble from sources such as
turntables
--20dB Audio Muting for instant lowering of volume without adjusting the
volume control. Great for ringing phones and cuing a record on your
turntable
- Dual 7-Segment LED power meters
Inputs:
- Dual Phono / turntable inputs with Built-In
Phono Pre-Amps
- Dual tape monitors with Tape monitor 'B' also featuring a DIN input as
well as the standard RCA I/O's
(Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT /
MP3 / iPod® / 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)
- 1>2 Tape 'Dubbing' capability
- Tape/Aux input (may also be used for Video /
CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 /
XM® / SIRUS® etc.)
- Dolby 'Adaptor' Loop can be used as a signal processor loop for
EQ, Dynamic Range Expanders, Reverbs, Delays, DBX units, etc.
- 1/4", stereo headphone jack
- Dual Phono inputs with built-in phono pre-amp
- Front mounted 1/4" Microphone jack
- Microphone Level control (allows you to use
receiver as a 'Karaoke' unit...be careful with speakers if doing this)
Other:
- Dual AC outlets (1 switched / 2 un-switched)
with a total capacity of
250 watts
- True
“WORLD
AC POWER"™ as it will work on both 50 or 60 Hz AC and voltages from
110-240 volts AC
Original Sansui G-7700 Specifications:
"The G-7700 has a continuous power output of
120 watts per channel min @ 8 ohms from 20
hertz to 20,000 hertz with no more than 0.025%
THD (measured utilizing AUX input)"
POWER / PRE AMP SPECIFICATIONS:
THD:
0.025% @ 120 wpc @ 8
Ohms
Freq Response of power amp section: @ full rated power 20-20kHz
Potential frequency response of power amp section @ 1w:
7 Hz to 90KHz, + 0
dB,- 1 dB
IMD utilizing AUX: 0.025% @
120 wpc
Hum / Noise Ratio: 95dB
Slew Rate: 60
@ 8Ω full bandwidth (One of the main reasons this
thing is so punchy)
Damping factor: 50 @ 8Ω full bandwidth
(One of the other main reasons this thing is so punchy)
Tone Control ranges:
Bass: +/-10dB @
50Hz
Treble:
+/-10dB @ 10kHz
Hi Filter:
-3dB @ 3kHz
&
6dB/octave
Lo / 'Sub' Filter:
-3dB @ 16Hz &
6dB/octave
Loudness Contour w/ vol
@-30dB: + 8dB at
50Hz, + 6dB at 10KHz
Pre-Amp Input Sensitivity at all
inputs except phono & mic: 150mV
Microphone Input Impedance: 10k Ohms
Microphone Input Sensitivity: 6mV
Input Freq Response (except Phono & Mic): 15-40kHz
Tape Output Impedance: 47k Ohms
Tape Output: 150mV
Pre-Amp S/N @ 'Tape' & 'AUX':
95dB
Channel Separation Phono / All Other:
60dB / 65dB
TUNER SPECS FOR FM:
Tuning Range: 88-108MHz
Freq Response: 30-15kHz per FCC Regulations
S/N: > 76dB Mono @ 65dBf
S/N: > 71dB Stereo @ 65dBf
Useable Mono RF Sensitivity dBf / μV: 9.8dBf
/ 1.7μV
Useable Stereo RF Sensitivity in dBf / μV: 17dBf
Capture Ratio: 1.0dB
Signal for 50dB quieting, Mono dBf / μV: 14dBf
Signal for 50dB quieting, Stereo dBf / μV: 36dBf
De-Emphasis: selectable 25 or 75 μ-sec
THD w/ 100% modulation @ 1kHz, Mono: 0.1%
THD w/ 100% modulation @ 1kHz, Stereo: 0.15%
IF Response Ratio: 95dB
Spurious Response Ratio / Rejection:
90dB
IF Response Ratio:
95 dB
FM Alternate Channel Selectivity: 70dB
Stereo Separation: 42dB @ 1kHz or
25dB @ 30-15kHz
TUNER SPECS FOR AM:
Tuning Range:
530-1600kHz
RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity: 33dB
Distortion @ 30% modulation & 80dB/m:
<0.5%
Signal to Noise Ratio: 46dB
PHONO SECTION SPECS:
Freq Response: 20-20kHz
(way better than either of it's little brothers, the G-5700 or G-6700)
S/N: 78 dB, ref w/ 10mV input
Input Sensitivity: 2.5 mV @
47kΩ
Overload limit: 250 mV @ 1kHz
Again, we have completely gone through this
Sansui G-7700 Stereo Receiver, as stated above
and 'certified'
it's ready to go! This is an incredible sounding
receiver in all aspects. Due to it's huge power output, even at very low
volumes it sound's like a "Class-A" amplifier. The controls are very
"musical" sounding, especially the tone control circuit. Also, the
reception on both the AM and FM tuning bands are
excellent, and the AM is exceptional
for a stereo receiver. For the majority of folks, exceptional AM would
be inconsequential, but if it is important to you, like it is to me,
this becomes an all-around, very usable receiver and a pleasure to use.
Brushed aluminum face and all original, milled
knobs in fabulous shape. Wood grain, vinyl wrapped case in great shape
as well with only normal, minor cosmetic wear.
Entire unit looks NEW! After restoration, receiver performs and sounds
great!
Cosmetically, this unit is in
very good condition.
Brushed aluminum face and knobs all original and in great condition.
Unit looks great and sounds HUGE! Measures 20"
wide x 16.75" deep x
7.25" high and weighs a
HEAVY
40 lbs unpacked.
Includes our standard 90 day limited warranty!
SANSUI G-7700 STEREO RECEIVER
Cond.
8.5
(C) M.R.
SOLD 5/17/13
SHIPPING TO SOUTH DAKOTA
(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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NEW ADDITION
2/4/11
(Click
on above thumbnails to enlarge photos)
warranty
VINTAGE STEREO RECEIVER KENWOOD 'SUPER QUAD' QUADRAPHONIC / 4-CHANNEL
/ 2-CHANNEL STEREO RECEIVER KR-9940 / KR-9340
kr9940
#...0541
Circa 1973-76
"WORLD
AC POWER"
™
M.I.J.
for sale
Our
technician has completely gone through and 'Certified'
this unit.
-
Everything was cleaned inside and out
including all
switches, controls and contacts including
phono and tape monitor selectors.
-
Capacitor replaced
in protection circuit.
-
We also resolved a
decoder issue, the 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!
-
The all dial & meter lamps replaced with new
bulbs for trouble-free service.
-
We also
disassembled the power switch and replaced the internal neon lamp (the
power switch on this unit actually 'lights' up when the unit is off,
presumably to make it easier to find in a darkened room and is off when
the unit is on).
-
We
also, removed the entire output / heat sink section, removed all the
output transistors and applied fresh heat sink compound which should be
good for another 30 years now.
-
Amplifier section had output bias and DC offset adjusted to spec
levels.
-
All inputs 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.
-
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
into a 4 ohm load.
On
our test bench, this particular KR-9940,
#...0541, amplifiers each produced 23.75
volts per channel for 70 watts per
channel @ 8 Ω via discrete output & 19.74
volts per channel for 97 watts per channel @ 4
Ω
via discrete, Metal cased, TO-3 outputs.
(AC draw at idle 0.60A
tested)
(Floor noise measured at 2.5mVAC)
___________________________
Impressive huge Kenwood Silver-face receiver,
surrounded by handsome, real Walnut wood veneer
side plates. This unit has
about 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.
This
unit appears to have been marketed under two model numbers. The KR-9940
and the KR-9340
(likely one for North America and the other for the rest of the planet).
From original Kenwood brochures, "Kenwood
KR-9940 can function as a two or four channel
receiver, having a built in regular matrix and SQ type decoders....As
a four channel receiver the amplification channels work separately, each
driving one of four speakers....The
semi-complementary directly coupled power amplifiers have wideband and
low distortion characteristics which ensure smooth, high-fidelity
amplification....Two pairs of speaker
terminals are available to permit simultaneous listening at two
different places....A double switching
demodulator is used in the MPX section to prevent carrier leaks and
ensure the best sound quality".
Features
include:
- Quadraphonic (no it's not spelled 'quadriphonic'
!!!) / 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 for reducing 19kHz pilot tone in FM
broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
- FM muting (separate from Stereo / Mono selector)
- 'Mode' selector for Stereo / Mono,
2-Channel & 4-Channel modes of 'RM' / 'SQ Logic', or 'Discrete'.
- Aux inputs
for both Front and Rear (may also be used for
Video
/
CD / DVD /DAT / VCR
/ MP3 / iPod®
/ iPad® / iPhone® /
iTouch® / iGadget / 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® / 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)
- 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
- Dual Meter Level selector
- Front and Rear 1/4" stereo headphone jacks
- Rear mounted 1/4"
microphone jack (be careful with your
speakers if you are going to utilize this!)
- Tuning window features dual VU meters for tuning and signal strength
- Quad VU meters for
power output level
- FM Detector RCA output
-
*Kenwood's
KCD-2, CD-4 system, disc
demodulator
Adaptor
slot and includes the KCD-2 adaptor
that is often missing on these models
- Rear located, full barrier strip for external antenna connections
- Rear located main AC protection fuse
- Triple AC convenience outlets on rear panel with 1 switched and 2
un-switched for a total capacity of 160 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
Original
Specs:
"The
KR-9940 has a
'Direct-Coupled / DC' amplifiers that produce continuous power
output of
40 watts per channel min. @ 8 ohms from 20
hertz to 20,000 hertz with no more than 0.5% THD (measured utilizing AUX
input)"
Original Kenwood KR-9940 / KR-9340 Specifications:
POWER / PRE AMP SPECIFICATIONS:
THD;
0.5% @ full rated power
or 0.1% @ 50% rated power @ 1kHz.
Freq Response of power amp section;
@ full rated power 20-20kHz
Power bandwidth of power amp section;
10-50,000Hz ±0dB
IMD utilizing AUX;
0.5% @ full rated power / 20-20kHz and 8 Ohms
Damping factor; 30 @ 8Ω full bandwidth
Dynamic rated Power: 2 x
240 watts @ 8 Ohms or 340
watts @ 4 Ohms
Cont rated Power:
4x 40 watts @ 8 Ohms / 20-20kHz
4x 44 watts @ 8 Ohms
/ 1kHz
4x 55 watts @ 8 Ohms
/ 1kHz
Hum and Noise; 75dB on AUX /
Tape
Input Sensitivity AUX / Tape; 150mV @ 50kΩ
Tape 1/2 Output level, via RCA; 150mV @ 50kΩ
Bass Control; ±10dB @ 100hz
Treble Control; ±10dB @ 10khz
Low Filter; -8dB @
100Hz @ 6dB Oct
High Filter; -6dB @
5kHz @ 6dB Oct
"Loudness" Contour; +10dB @ 100hz, +5dB
@ 10khz (w/ volume set at -30dB)
PHONO SECTION SPECS:
Freq Response; 20-20kHz RIAA Standard Curve +/-
1dB.
S/N; 60 dB
Input Sensitivity; 1.5 mV @ 50kΩ
Overload limit; 100 mV
w/ 5% THD @ 1kHz
TUNER SPECS FOR FM:
Freq Response; 20-15kHz
S/N; > 63db Stereo
w/ 1mV input
AM Suppression;
60dB
Mono Sensitivity; 1.8 μV
Capture Ratio; 3.0dB
IF Rejection; 90dB
Spurious Noise Ratio; 90dB
THD w/ 100% modulation @ 400Hz, Mono;
0.7%
THD w/ 100% modulation @ 400Hz, Stereo;
0.8%
Stereo Separation; 40dB
at 1Khz & 20dB @ 10kHz
FM Alternate Channel Selectivity; 50dB
TUNER SPECS FOR
AM:
Tuning Range; 530-1600kHz
S/N; > 45db w/ 1mV
input
Useable Sensitivity; 25μV / m with
ferrite stick antenna
Image Rejection; 45dB
IF Rejection; 35dB
Selectivity; 30dB
Power consumption at max output;
550 Watts. 38 Watts w/ no signal at idle
Again, as stated before, we have completely gone through this Kenwood
KR-9940 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! Very nice looking when lit up at night
or in a darkened room! Comes with a PDF service
manual. Measures 21.5" wide x
6.5" tall x 14.5"
deep and weighs an impressive 47 lbs unpacked.
Includes our standard 90 day limited warranty.
KENWOOD KR-9940 STEREO RECEIVER
Cond. 8.5
$889.
w/ KCD-2 Quadraphonic adaptor installed
*$799.
if you don't need the adaptor
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details) |
Did you know?
What is the difference between a ‘Tuner’ and a ‘Receiver'?
A ‘Tuner’ is the component or
aspect of an audio system that receives or ‘Tunes-In’ Radio Stations.
A 2-channel, stereo ‘Receiver’ is really 3 units in one!
It’s a ‘Tuner’ for receiving radio stations. It’s a ‘Pre-Amp /
Control-Amp’ for source / input selection & tone / audio signal
modification (with likely the phono 'pre-amp / head-amp' built-in).
Lastly it’s a ‘Power Amplifier’ to energize your speakers. It's
essentially the 'heart' of most audio / stereo systems.
Some manufacturers would silk-screen 'Tuner-Amplifier' on
the front of their receivers, but that was / is simply 'marketing' to make it sound as if it's something more complicated. It's still
a 'receiver'. Just FYI.
|


NEW LISTING 5/14/13
(Click
on above thumbnails to enlarge photos)
warranty
VINTAGE & BEAUTIFUL PIONEER STEREO RECEIVER
THE CLASSIC PIONEER SX-838 / SX838
Circa 1974-76
"WORLD
AC POWER"
™
MIJ
for
sale
ü
Our technician has completely gone through
and 'Certified' this unit.
ü
Everything was cleaned inside and out including all contacts, switches
and controls.
ü
Multiple (ALL), 'typically-sticky' push switches removed, overhauled /
cleaned and lubed across front
ü
Dial glass removed and completely / solidly re-attached
ü
Skewed control shafts straightened
ü
Electrolytic power supply filter capacitors tested for leakage
ü
Balance of
Electrolytic capacitors inspected and replaced as
necessary
ü
All question-able and common 'stress point' solder joints re-flowed
ü
All 4 power transistors removed, tested for leakage
ü
Shorted / bad output transistors replaced with ‘new’
2SC1079 TO-3’s
ü
All output transistors re-installed with fresh heat-sink compound (usually good
for 20-30 years)
ü
Bias current adjusted to correct levels.
ü
DC offset adjusted to super low levels.
ü
We also aligned the tuner for optimum AM & FM performance as older
internal tuner components have always drifted on vintage gear over the
years.
VERY GOOD TUNER!
AM reception
WAY
above average, FM reception incredible, PUNCHY, with
GREAT SEPARATION and
IMPECCABLY CLEAN!!!
due
to the 'Pair of Dual-Gate MOS-FETS'
FM front end and the quality of the restoration.
ü
All (18 in total) meter, dial, function indicator,
'Speaker Indicator' (not an easy task) and FM stereo indicator lamps
replaced for trouble-free service (dial / meter lamps ‘blue tinted’ to
original color)
ü
Entire unit cleaned / detailed cosmetically inside and out.
Only cosmetic issue is that some 'id' info has been 'rubbed / ground'
off the top edge of the face plate at sometime in the past
(not seen from the front of the unit, only when
looking down on it)
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! All functions test fine.
ü
Following restoration procedures, the unit was run continuously at
medium volume, as all our amplifiers / 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 time investment ~8 hours.
On our
test bench, the internal amplifiers of this receiver #...777M produced
23 volts per channel @ 8 ohms with 1Khz input for 66 watts and 18 volts
per channel @ 4 ohms with 1Khz input for 81 watts via discrete, TO-3,
metal cased outputs. (2x 2SA679 & 2x 2SC1079).
AC Idle current at 400mA, Bias adjusted and DC offset output adjusted
to < 0.6 mV DC either channel Floor noise @ <0.5mV AC either channel.
____________________________
This is from the series that is commonly referred to
as Pioneer's 'Blue Face' receiver offering. Beautiful receiver. Classic looking
brushed-aluminum silver face panel, surrounding
'smoked' dial glass, with 'aqua back-lit' enumeration. All encased in a
walnut grain, vinyl wrapped,
cabinet with solid Walnut wood corner caps. These are SERIOUS receivers
and this one has been 'certified'
following the refurb by Oak Tree Vintage and is in
great
condition!!!
Pioneer SX-838 Stereo Receiver Features:
Tuner features:
- Weighted flywheel analog "slide-rule" tuning
- PLL FM Tuning and 'Dual Mos-Fet' circuitry
- Fully Shielded tuner 'Front End'
- FM Muting Selector (separate from the 'Stereo' selector)
- Dual analog 'Signal Strength' and 'Tuning' VU meters
- FM Detector / 4-channel RCA output
- Dual position FM De-emphasis selectable for 50 or 75 msec
- Built-In AM 'Stick / Bar' antenna
Pre-Amp / 'Control Amplifier' features:
- A, B, C, A+B, A+C, B+C & Off speaker selector
(max 2 pair at a time, just with most all receivers / amplifiers to
maintain a 4 Ohm minimum)
- Dual-Band EQ w/
selectable 'centers' (Bass controls centered at
200 or 400 Hz and
Treble @ 2.5 or 5kHz) (same
EQ as the SX-950)
- Tone Defeat for purest signal path
- Super quality de-tented Tone and Volume controls
- "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 entire pre-amp section, not just FM tuner)
- 'Scratch-Filter / Hi filter for reducing tape hiss / electronic hiss & noise and record
static
- Built-in 'Low' Filter to eliminate excess rumble from sources such as
turntables
- 'Record Selector' allows monitoring of another
source, while recording something else
--20dB Audio Muting for instant lowering of volume without adjusting the
volume control. Great for ringing phones and cuing a record on your
turntable
Pioneer SX-838 Inputs:
- Dual Phono / turntable inputs with Built-In
Phono Pre-Amps
- Dual tape monitors with Tape monitor 'B' also featuring a DIN input as
well as the standard RCA I/O's
(Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT /
MP3 / iPod® / 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 'Dubbing' capability
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Dolby 'Adaptor' Loop can be used as an additional input or as a
signal processor loop for EQ, Dynamic Range Expanders, Reverbs, Delays,
DBX units, etc.
- 1/4", stereo headphone jack
- Dual Phono inputs with phono 2 doubling
- 1/4" front mounted Microphone input
Other:
- Pre-out / Main-in loop (allows feed to an
additional / larger power amp, or to 'direct feed' the power-amp in the
receiver with another pre-amp or audio mixer)
- Easy 'Serviceable' internal design
- Triple AC 'Convenience'
outlets (1 switched / 2 un-switched)
with a total capacity of
300 watts
- True
“WORLD
AC POWER"™ as it will work on both 50 or 60 Hz AC and voltages from
110-240 volts AC
Original Pioneer SX-838 Specifications:
"The SX-838 has a continuous power output of
50 watts per channel min @ 8 ohms &
60 wpc @ 4 Ohms, from 20 hertz to 20,000
hertz with no more than 0.3% THD (measured utilizing AUX input)"
POWER / PRE AMP SPECIFICATIONS:
THD:
0.3% @ 50 wpc @ 8 Ohms & 0.05% @
1 wpc @ 8 Ohms
Freq Response of power amp section:
@ full rated power 20-20kHz
Potential frequency response of power amp section @ 1w:
10 Hz to 70KHz, + 0
dB,- 1 dB
IMD utilizing AUX: 0.3% @
85 wpc
& 0.05% @ 1 wpc @ 8 Ohms
Hum / Noise Ratio: 110dB
(10dB increase
over the SX-950)
Damping factor: 45 @ 8Ω full bandwidth
(almost double the SX-950)
Power Amp Input Impedance: 50k Ohms
Power Amp Input Sensitivity for Full Output: 1V
Headphone: 4-16 Ohms
Tone Control ranges:
Bass: +/-10dB @
200Hz or 400Hz
Treble:
+/-10dB @ 2.5kHz
or 5kHz
Hi-Cut / Scratch Filter:
-9dB 10KHz,
6dB/octave
Lo Cut Filter:
-8dB / 50Hz,
6dB/octave
Loudness Contour w/ vol
@-40dB: +8dB at 100 Hz, +4dB at 10KHz
Pre-Amp Input Sensitivity at all
inputs except phono & mic: 150mV
Microphone Input Impedance: 50k Ohms
Microphone Input Sensitivity at all inputs except phono & mic:
2.0mV
Input Freq Response (except Phono & Mic): 15-40kHz
Tape Output Impedance: 150k Ohms
Tape Output: 150mV @ RCAs & 30mV @
DIN
Pre-Amp Output Impedance & Level:
1V / 2k Ohms
Pre-Amp THD @ rated output:
<0.1%
Pre-Amp S/N @ 'Tape' & 'AUX':
95dB
Pre-Amp S/N @ ''Microphone':
65dB
TUNER SPECS FOR FM
(essentially similar specs on the SX-950 and SX-939):
Freq Response: 20-15kHz
S/N: > 70dB Mono @ 65dBf
Useable Sensitivity (IHF):1.8μV
Capture Ratio: 1.0dB
De-Emphasis: selectable 50 or 75 μ-sec
THD w/ 100% modulation @ 1kHz, Mono: 0.2%
THD w/ 100% modulation @ 1kHz, Stereo: 0.4%
IF Rejection: 100dB
Stereo Sub-Carrier Rejection: 65dB
AM Carrier Rejection / Suppression
ratio: 55dB
Spurious Rejection: 100 dB
Image Rejection: 85 dB
FM Alternate Channel Selectivity: 80dB
Stereo Separation: 40dB @ 1kHz
TUNER SPECS FOR AM:
RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity: 40dB
IF Response Rejection Ratio: 85dB
Image Rejection: 65dB
Signal to Noise Ratio: 50dB
PHONO SECTION SPECS:
Freq Response: 30-15kHz
S/N: >70dB, ref w/ 10mV input
Input Sensitivity 'Phono-1' or 'Phone-2':
2.5 mV @ 50kΩ
Overload limit: 200-250mV @ 1kHz
Most techs, including myself, who have been inside of the various SX
Pioneer series receivers, can see quite a few examples of why they
believe earlier series are better built than the later series,
especially once 1980-81 rolled around. Things TO-3, metal cased outputs,
shielding around the control pots and some sensitive circuit boards to
reduce RFI noise, heavier control pots and Molex connected pre-driver /
output circuit boards to facilitate future service.
Again, we have completely gone through this
Pioneer SX-838 Stereo Receiver, as stated
above and 'certified'
it's ready to go!
This is the first SX-838 (or any of that series) we've had in quite a
few years. Cosmetically, with the exception of the
previously mentioned 'id' info, the unit is in overall, great condition. Unit
looks good, works great and sounds HUGE! Includes an 'e' copy of the
original Pioneer SX-939 (essentially the same as the SX-838, just a bit
more power) owners / users / instruction manual, and brochure. Measures 20.5"
wide x 16.5" deep x
6.75" high and
weighs a HEAVY 35
lbs unpacked.
Includes our standard 90 day limited warranty!
PIONEER SX-838 STEREO RECEIVER
Cond.
8.5+
$649.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|


NEW
LISTING
10/13/12
(Click on above
thumbnails to enlarge photos)
warranty
VINTAGE ROTEL STEREO RECEIVER
ROTEL RX-803 / RX803
#...7457
Circa 1976-'81
MIJ
for sale
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.
Internal and external fuses checked and
replaced where necessary.
ü
Bad driver board capacitors and transistors replaced.
ü
Slightly leaky TO-3 output transistor replaced with
an exact and
original transistor we had in our 'private stash'.
ü
We also extensively aligned the tuner front-end,
as well as the 'MPX'
circuit for optimum AM & FM performance
as older internal tuner
components have always drifted
on vintage gear over the years. Generally
AM reception
in a stereo receiver is treated as an 'after thought',
but
the AM reception on this Rotel RX-803, #...7457 is pretty decent.
Great
sounding FM tuner on this receiver. Very clean, punchy and musical
following alignment.
ü
All dial and meter bulbs replaced.
ü
DC offset and driver board / output bias current set to correct values.
ü
All inputs and functions tested, and both amplifiers produce
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
Unit has been thoroughly detailed inside and out.
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
and into a 4 Ohm Load!
Only cosmetic issues are a bit of minor wear to the face,
including a
small blem to the silver plating (see above photos).
On
our test bench, each internal amplifier of this Rotel RX-803,
#...7457 produced peak power of 25 volts per channel for 78 watts per
channel @ 8 ohms and 21.6 volts @ 4 ohms for 116 watts per channel via
discrete, TO-3, metal cased output devices (4x Sanken 2SC1116). Idle
current measured at 260mA. Bias current & DC offset / output adjusted to
levels within spec. Floor noise measured at 0.3mVAC.
____________________________
VERY PUNCHY and 'Musical' sounding, Rotel RX-803 Stereo Receiver. I
have a 'soft spot' for Rotel receivers of this time period. I sold them
when new, and always liked most of their mid to upper-end models (one of
my main personal receivers is a Rotel from this same period). This is a
very punchy and full sounding receiver. Very 'musical' sounding. Doesn't
fall apart with larger speakers utilizing 15 inch drivers. Well designed
amplifiers feature, EXTERNALLY located, vertical heat sinks that keep
the heat producing transistors outside of the receiver housing where it
belongs. All units should utilize this design.
Rotel RX-803 Features include:
§
Weighted flywheel analog, 'slide rule' dial tuning
§
A, B and A+B speaker selector
§
Separate L & R Bass & Treble with high quality detented controls
§
'Tone Defeat' for purest signal path
§
Pre-Out / Main-In loops
§
Dual tape deck monitors w / 'Tape2' featuring both RCA and DIN
(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® / 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)
§
Dual Phono / Turntable inputs with built-in ‘phono pre-amp’ and
with
'Phono1' featuring both RCA and DIN
§
AUX Input (may also be used for Video / CD / DVD / VCR / DAT / MP3 / XM
/ SIRUS etc.)
§
"Loudness" function to boost Bass and Treble 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
§
Hi filter for reducing tape hiss / electronic hiss & noise and record
static
§
Stereo / Mono selector for entire pre amp section
§
FM Muting Selector (separate from the 'Stereo' selector)
§
Separate Analog meters for Signal Strength and 'Tuning'
§
Dual position FM Deemphasis selectable for 25 or 75 msec
§
-15dB Audio Muting for instant lowering of volume without adjusting
the volume control. Great for ringing phones and cuing a record on your
turntable
§
Dual AC convenience outlets located on the rear panel
(1 switched @ 100 watts and 1 un-switched @ 100 watts for a total
capacity of 200 watts)
Rotel
RX-803
Original Specs:
"The
Rotel RX-803 Stereo Receiver has a continuous / RMS power output of 70
watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no
more than 0.2% THD (measured utilizing AUX input)"
POWER / PRE AMP SPECIFICATIONS:
Output of power amp section;
@ 70 watts / 8Ω 20-20kHz
Damping factor; 50 @ 8Ω / 20-20kHz +/-10%
Hum and Noise; 90dB on AUX / Tape w/ 150mV input
THD utilizing AUX;
<0.2% @ 70 watts 20-20kHz (0.08% @ 1 Watt)
Freq Response / Bandwidth of power amp section; 5-60kHz @ 1
watt / 8Ω
Input Sensitivity; 150mV @ 50kΩ on AUX / Tape
w/ overload at 5 Volts
Output levels / impedance (w/ 5mV Phono Input); Tape RCA 330mV /
2.2k Ohms
Pre-Out levels / impedance (w/ 5mV Phono Input); 0.775V / 2.2k
Ohms
Bass Control; ±10dB @ 100hz
Treble Control; ±10dB @ 10khz
Low Filter; ~ -10dB @ 40Hz @ 12dB Oct
High Filter; ~ -10dB @ 12kHz @ 12dB Oct
"Loudness" Contour; +7dB @ 50hz, +3dB @ 10khz (w/ volume set at
-30dB)
TUNER SPECS FOR FM;
Freq Response; 30-15kHz ±0.5 dB
S/N; >65db Stereo
S/N; >70db Mono
50 dB Quieting Sensitivity:
Mono 3.2μV (15.2dBf)
Useable Mono Sensitivity; 10.4dBf /
1.8μV
Mono
Capture Ratio; 1.5dB
FM Alternate Channel Selectivity; 75dB
Spurious Response Ratio; 90dB
Image Response Ratio; 85dB
IF Rejection / Response Ratio; 95dB
AM Suppression Ratio; 60dB
Stereo Separation; 43dB @ 1k & 30dB @ 30-15kHz
THD 100% modulation @ 1kHz mono / stereo; 0.1% / 0.3%
TUNER SPECS FOR AM;
Tuning Range; AM Band ~450 kHz-1700 kHz
Useable Sensitivity (IHF Bar Antenna); 250 μV/m
Useable Sensitivity (External Antenna); 12.5 μV/m
PHONO SECTION SPECS;
Freq Response; 30-15kHz
S/N; 75dB with MM cart.
Input Sensitivity for rated output of 70 wpc RMS; 2.5 mV
@ 50kΩ
Overload limit; 200 mV
Again, as
stated before, we have completely gone through this
Rotel, RX-803, Stereo Receiver cleaning and
testing all and it gets our full
'Certification'
. All functions test fine. This is one of the
best 'thumping' amplifiers we've had on our 'burn-in' bench in a while.
We have a 3000 sq foot warehouse, and it fills it to an 'uncomfortably
high' volume level. This receiver, works and sounds great!
Includes a pdf 'e' copy of the Rotel RX-803 owners manual. Unit measures 19.5"
wide x 6" tall x 17" deep and weighs
32 lbs unpacked. Includes our standard 90 day limited warranty.
ROTEL RX-803 STEREO RECEIVER
Cond. 8.5
$589.00
(C) R.R.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
Did you know?
A SUPER LOW DISTORTION RATING COULD LIKELY BE A BAD
THING!...
THD
(Total Harmonic Distortion) – THD is a measure of the how much a given audio
device may distort a signal through the inevitable introduction of added
harmonics or overtones. These figures are usually given as percentages. THD
figures below approximately 1% are inaudible to most people (although market
promotion efficiencies have 'brain-washed' much of the 'audio-public' into
weighting low THD with almost 'holy grail' importance. I remember some
manufacturers touting numbers as low as <0.003% in the early Eighties). Low
THD is not always an indication of a high quality amplifier. In fact, it is
/ was more commonly just the opposite. Some of the 'highest end' (read
REALLY expensive) and certainly best sounding units will have distortions
somewhere between .1% & 1%.
Low THD is only a simple 'bi-product' of 2 aspects. The first was an
inordinate and increasing amount of 'global / negative feedback' built into
amplifiers primarily to suppress distortion. This practice started to occur
in the late 1970's and certainly was in 'full force' past the early 1980's
for most 'main stream' consumer-grade audio amplifiers. Unfortunately this
also 'suppressed' tone and 'punch' (musicality) but it made the numbers look
good to the 'spoon fed' consumer (kind of like overly high speaker wattage
numbers, and sorry if you're in that group and, most folks were so you're
not alone). Secondly manufacturers were moving away from
'discrete-transistor' output designs to more 'monolithic' 'power-pack'
output designs. While these designs reduced power supply requirements, thus
reducing parts costs and weight (also translates to lower prices due to
savings on freight from Asia) they generally sounded anywhere from somewhat
'anemic' compared with the designs from a few years previous, to completely
'gutless' and 'un-musical'. But, hey,… they had very low distortion
figures….Can anyone say 'threw the baby out with the bath water'?
Excerpts of the above text from one of
the best Car Audio sites and stores in the world, 'Car-Fi'
www.car-fi.com .
|


NEW LISTING
10/10/12
(Click on above thumbnails to enlarge
photos)
warranty
PRE-OWNED VECTOR
RESEARCH STEREO RECEIVER
VECTOR RESEARCH VRX-9000 / VRX9000
Circa 1978-'83
MIJ
for sale
Our
technician has completely gone through
and 'Certified' this unit.
-
Everything was
cleaned inside and out including all contacts, switches, controls and
I/O jacks.
-
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. Tuner digital readout is within 0.1Mhz of
spec, meaning example '98.1' reads '98.2'.
-
Battery backup compartment
clean and corrosion free.
-
Generally AM reception in a stereo receiver is
treated as an 'after thought', but the AM reception on this Vector
Research VRX-9000, #...4176 is WAY above average (frankly it's amazing).
VERY GOOD TUNER! FM reception as well great
and IMPECCABLY CLEAN!!!
-
Power indicator meter lamps replaced.
-
DC offset
and driver board / output bias current set to correct values.
-
Entire display / readout works perfectly.
-
All
inputs and functions tested, and both amplifiers 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.
-
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
and into a 4 Ohm Load!
On
our test bench, each internal amplifier of this
Vector Research VRX-9000, #...4178 produced
peak
power of
30 volts per channel
for 112 watts per channel @ 8 ohms and 25.5
volts @ 4 ohms for 162
watts per channel via
discrete output devices. Idle current measured
at 250mA. Bias current & DC offset /
output adjusted to levels within spec. Floor noise
measured at 3.3mVAC.
____________________________
VERY PUNCHY Vector Research VRX-900 Stereo Receiver designed in the
tradition of the classic analog models, but with the convenience of a
digital tuner. This is a very punchy and full sounding receiver (witness
the 3dB 'headroom' spec). Very 'musical' sounding. Doesn't fall apart
with larger speakers utilizing 15 inch drivers. This was their
'Top of the Line' model for that period with
performance and specs to prove it.
I actually sold this model when new, while working
for a Vector Research dealer.
Features include:
-
Quartz Locked, Digital Synthesized tuning (but still internally
adjustable for technicians)
- 6 AM & 6 FM tuner presets
- A, B and A+B speaker selector
- Separate Bass, Mid & Treble with high quality de-tented controls
- Dual Analog 'VU' Power Meters with Dual Range Selector
- 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® / 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 Dubbing
- Phono / Turntable input
- AUX Input (may also be used for Video / CD / DVD / VCR / DAT / MP3 /
XM / SIRUS etc.)
- Variable "Loudness" control normally found on Yamaha units
- Built-in Subsonic Filter to eliminate excess rumble from sources such
as turntables
- Hi filter for reducing tape hiss / electronic hiss & noise and record
static
- Stereo / Mono selector for FM tuner
- FM muting function
- Dual position FM De-emphasis selectable for 25 or 75 msec
- 5-Segment LED indicators for tuning signal strength
- Dual AC convenience outlets located on the rear panel (1 switched @
100 watts and 2 un-switched @ 200 watts for a total capacity of 300
watts)
Vector Research
VRX-9000 Original Specs:
"The Vector Research VRX-9000 Stereo Receiver
has a continuous / RMS power output of 80
watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no
more than 0.05% THD (measured utilizing AUX input)"
POWER / PRE AMP SPECIFICATIONS:
Freq Response / Bandwidth of power amp section;
@ 80 watts / 8Ω
20-20kHz
THD utilizing AUX;
0.05% @ 80 watts 20-20kHz
Dynamic Headroom; 3dB @ 8Ω
TUNER SPECS FOR FM;
Freq Response; 30-15kHz ±0.5 dB
S/N; >70db Stereo
S/N; >75db Mono
50 dB Quieting Sensitivity:
Mono 1.8 μV (15 dBf)
Stereo 25 μV (35 dBf)
Useable Mono Sensitivity (98 MHz, 30 dB Quieting); 9.8
dBf
Capture Ratio; 1.0dB
FM Selectivity; 65 dB
THD 100% modulation @ 1kHz mono / stereo;
0.06% / 0.07%
PHONO SECTION SPECS;
Freq Response; 20-20kHz
S/N; 88 dB with MM cart.
Overload limit; 180 mV
Again, as stated before, we have completely gone through this
Vector Research VRX-9000, Stereo Receiver cleaning and testing
all and it gets our full
'Certification'
with only the 0.1Mhz readout issue.
All functions test fine. This receiver looks
near NEW, works and sounds great! Unit measures 17.25"
wide x 5.5" tall x 15" deep and weighs
32 lbs unpacked. Includes our standard 90 day
limited warranty.
VECTOR RESEARCH VRX-9000 STEREO RECEVIER
Cond. 8.5+
$489.00
(C) R.R.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|

NEW ADDITION
5/10/13
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE STEREO RECEIVER
SANSUI 2000X STEREO RECEIVER
#...1204
Circa
'73-76
"WORLD AC POWER"
™
MIJ
for sale
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
Repaired power supply and power supply board
ü
Replaced ‘leaky’ transistors on driver board
(which
by the way, once biased, brought the idle temperature of the heat-sink down
from ~220 degrees to ~72°)
ü
All 4 power transistors removed and tested for leakage, the re-installed
with fresh heat-sink compound applied.
ü
Repaired AM circuit board
ü
Re-flowed multiple solder joints
ü
We also aligned the tuner for optimum AM & FM performance as older internal
tuner components have always drifted on vintage gear over the years.
ü
All meter, dial, and FM stereo lamps replaced for trouble-free service (very
difficult to do on this series of receiver).
ü
Tuner string re-tensioned for improved flywheel 'grip'
ü
Amplifier section had
output bias and DC offset adjusted to spec levels
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 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 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 ~14 hours.
While this unit was originally rated at 55 wpc, on our test bench,
both this unit's amplifiers, #...1204 produced
peak power of 17 volts per channel @ 8 ohms for 36 watts and 14.5
volts @ 4 ohms for 52 watts per channel via
discrete, TO-3, metal cased outputs with 1 kHz input. (4x
Toshiba
2SC793,
(same as Sanken 2SC1111)). Idle current draw within spec. Floor noise
measured at 2mV AC w/
AUX shunted).
____________________________
This 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. Lot's 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 does
have a couple dings / 'battle scars', but nothing too distracting and certainly
doesn't distract from it's performance.
Features include:
§
Weighted flywheel, 'slide rule' style analog tuning
§
Dual Tuning Capacitors. One for FM and one for AM. Allows for incredibly
'quiet' tuning performance
§
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
§
Builtin Subsonic Filter to eliminate excess rumble from sources such as
turntables
§
PreAmp Out / PowerAmp 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® / 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)
§
Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® /
iPad® / iPhone® / iTouch® / iGadget / 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, with the previously mentioned 'dings' /
'battle-scars'. 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 our standard 90
day limited
warranty.
SANSUI 2000X STEREO RECEIVER
Cond.
8.5
$489.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|

NEW LISTING
12/11/12
(Click on above thumbnails to enlarge photos)
warranty
CLASSIC
KENWOOD STEREO RECEIVER
KENWOOD KR-4200
#...0845
Circa 1973
MIJ
for sale
Our
technician has completely gone through and 'Certified'
this unit.
-
Everything was cleaned
inside and out including cleaning inside and out including all contacts,
switches and controls.
-
Output transistors removed and fresh heat sink
compound applied.
-
As always, Bias current and DC offset checked for
tolerable limits and adjusted when necessary and possible.
-
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.
-
All meter and
dial lamps replaced for trouble-free service.
-
All inputs 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.
-
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
and into a 4 Ohm Load!
On our test bench, both this unit's
(#...0845) amplifiers produced peak power of 12.25
volts per channel @ 8 ohms for 18+ watts channel
via discrete, TO-3, metal cased outputs with 1 kHz
input. (2x NEC 2SA626
& 2x 2SD180). AC Idle current at .260A.
Floor noise at 2.0mVAC either channel.
____________________________
This Kenwood KR-4200 stereo receiver would be great in a smaller office,
bedroom, cabin system! Classic Brushed Silver, Smoke and Wood grain look.
Green, backlit dial screen. Brushed face with matching, milled aluminum
knobs.
Kenwood KR-4200 Features include:
- Weighted Flywheel, 'Slide Rule', analog tuning
- A, B, or A+B speaker selector
- Separate Bass and Treble controls featuring quality, 'de-tented' control
pots
- Stereo / Mono selector for entire 'pre-amp' section, not just the tuner
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- Phono / Turntable input
- Dual, TRUE' tape monitors featuring both standard RCA and DIN 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® / 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 AUX Inputs (may also be used for Video / CD / DVD / VCR / DAT / MP3 /
XM / SIRUS etc.)
- Front mounted 1/4" stereo headphone jack
- Analog VU Signal Strength meter for AM & FM tuning
- Built-in ferrite AM stick antenna
- Dual AC convenience outlets on rear panel, 1 'switched' for 60 Watts
capacity, and 1 'un-switched' for 300 Watts
Kenwood KR-4200 Receiver specifications:
POWER / PRE AMP SECTION:
Freq Response / Bandwidth of power amp section;
@ 19 watts / 8Ω
20-20,000 Hz
w/ max dynamic power of 82 watts at 4 Ohms.
THD utilizing AUX;
< 1.0% @ rated output
Input Sensitivity AUX / Tape; 150mV w/ 100k ohms impedance @ 1kHz
Bass Control Characteristics; ±10dB @ 50hz
Treble Control Characteristics; ±10dB @ 10khz
TUNER SPECS FOR FM;
Quieting Sensitivity:
Mono 2.3 μV
FM Selectivity; >50 dB
IHF
FM separation; >35dB @ 400Hz
Again,
as stated before, we have completely gone through this Kenwood KR-4200,
stereo receiver, cleaning and testing all and it gets our full
'Certification'.
Brushed aluminum face and knobs in like NEW condition. Unit looks and sounds
great. Real Walnut Wood veneer case in great condition. Measures 17.25" wide
x 13.75" deep x 5.25" tall and weighs 21 lbs unpacked. Comes with our
standard 90 day limited warranty.
CLASSIC KENWOOD KR-4200 RECEIVER
Cond. 8.5+
$359.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
So, why do the older / 'vintage'
receivers and amplifiers sound so much better (for music) than the much
more modern and fancier, 'surround sound - 5.1', '7.1', or '8.BR549' A/V
receivers?
Mostly due to Amplifier design and 'Amplification Classes' - All sound is
a sinusoidal waveform. It has alternating peaks and valleys. The center
point of each wave is the zero, or switching point that separates the
positive (top) from the negative (bottom) portion of each wave. When a
amplifier operates in Class A , the output tubes or transistors amplify
the entire waveform without splitting it into positive and negative
halves. In Class AB, used in the majority of classic receiver /
amplifier designs, the signal is split into two halves, positive and
negative, and each half is sent to a tube or transistor circuit for
amplification. Both sides work in tandem, and the two halves are
recombined at the output section to reconstruct the whole signal. This
technique increases the amount of power that can be applied, but
increases distortion.
In many 'modern' A/V and subwoofer amps, 'Class-D' is the dominant
design method. Class D operation is essentially a rapidly switching
power amplifier. Here the output devices are rapidly switched on and off
at least twice for each cycle. Theoretically, since the output devices
are either completely on or completely off they do not dissipate any
power, greatly increasing efficiency and lowering manufacturing cost
thru lesser parts and lighter freight weight. Not musically the best
sounding design for listening to standard, 2-channel music (Radio,
Vinyl, CD'S, DAT, Tape (not 'crappy' compressed, MP3 formatted files),
but popular for 'A/V-Surround-Sound' systems for reproducing 'movie
sound tracks' (not too difficult to do from a 'sonic quality
standpoint') where slightly elevated levels of distortion are tolerated
and for subwoofer use where maximum power is necessary, and slightly
elevated levels of distortion are also easily tolerated.
Excerpts of the above text from one of
the best Car Audio sites and stores in the world, 'Car-Fi'
www.car-fi.com .
|

NEW ADDITION 4/1/13
(Click on
above thumbnails to enlarge photos)
warranty
TECHNICS
STEREO RECEIVER
TECHNICS SA-303 / SA303
Circa 1982-'84
M.I.J.
for sale
Our technician has completely gone through and
'Certified' this unit.
-
Everything was cleaned inside and out
including all switches, contacts, and controls cleaned for static free
performance, complete cleaning inside and out.
-
He replaced all dial lamps
for trouble-free service. Balance of all other indicators are ‘trouble-free’
LED’s.
-
Following bench service, unit had a full cosmetic detail inside and
out.
-
With the exception of some minor scuffs on the tuning knob and around
the headphone jack, the unit looks GREAT! All inputs 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!
-
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
and into a 4 Ohm Load!
On our test
bench, the internal amplifiers of this particular unit, #...F486, produced
22 volts per channel at 8 ohms for 60 watts per channel and 18 volts at 4
ohms for 83 watts per channel via dual STK1039 power packs.
____________________________
Very
nice, compact size Silver face receiver. Great for smaller systems and
anywhere depth space is at a premium, but you still desire the Classic
Silver face / wood appearance.
Features include:
- Weighted flywheel analog "slide-rule" tuning
- A or B or ‘OFF’ & A+B speaker selector
- Dual 5-segment LED power meters with range selector
- Separate Bass and Treble utilizing super quality "de-tented" controls
- "Loudness" function to boost Bass relationship to Mid frequencies at lower
volume levels for a much fuller sound.
- FM Muting / Mono selector
- Hi filter for reducing tape hiss / electronic hiss & noise and
record static
- Phono / Turntable input with Built-In Phono Pre-Amp
- Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3
/ iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- 'Dual, TRUE' tape monitors 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, 8-Track Tape Cartridge Decks,
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)
- 5-segment LED tuning Signal strength meter
- Externally located speaker protection fuses
- Rear mounted, un-switched AC convenience outlet.
Again, as stated before, we have completely gone through this Technics
SA-303, stereo receiver, cleaning and testing all and it gets our full
'Certification'. These are great
all around receiver for small to medium sized systems. Receiver functions
and sounds Great. Unit measures 18 1/8" wide x 10.75" deep x 6" high and
weighs 13 lbs unpacked. Includes our standard 90 day limited warranty.
TECHNICS SA-303 STEREO RECEIVER
Cond. 8.5
$329.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|
|
|
What is a 'Receiver' and how is it
different than a 'Tuner' or an 'Amp'?
The term 'Receiver' refers to a combined unit consisting of at least 3
aspects incorporated into one. The 3 basic units are the AM/FM 'Tuner'
or radio, a 'Pre-Amplifier' / 'Control-Amp' and a 'Power-Amplifier' all
combined in one 'box'. Originally the general consensus was that
'receivers' did not perform as well as 'separates' and were sonically
inferior. While this may have been the case early on, as in the late
1950's to early '60's, technology improved quickly and by the mid-late
60's the arguments for separates over receivers for most 'mid-level'
consumer Hi-Fi applications were generally without merit. For 95% of
home-audio listeners, a receiver will be more than ample.
|

|
Click
here for our Restoration Procedures

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|
- |
- |
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CLICK ON A DEPARTMENT BELOW >
Wondering where
the "tone" you remember went?....

.... Surround yourself with Silver and find it again!
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- |
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SOLD ITEMS BELOW |
CLICK HERE TO SEE OUR ARCHIVE OF
SOLD RECEIVERS.
WE WILL LIKELY GET MORE OF THEM AGAIN!!!
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NEW ADDITION 4/16/13
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE
SCOTT 320R STEREO RECEIVER
SCOTT 320R 320
#...0011
Circa 1978-80
MIJ
SOLD 5/1/13
SHIPPING TO CALIFORNIA
Our technician has completely gone through
and 'Certified' this unit.
- Everything was cleaned inside and out
including all switches, controls and contacts. Extensive cleaning of
unit internally.
- Internal and external fuses checked for
correct value / function and replaced where necessary.
- All output transistors removed and
individually tested.
- Left channel output transistors replaced
with fresh heat sink compound applied to all output devices of course.
- 'Stuck' Power switch was repaired for proper
operation.
- Amplifier section had output bias and DC
offset adjusted to spec levels.
- All dial, meter, and indicator lamps were
replaced.
- 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. (Receiver
requires external FM and AM antenna connections.)
- Peeling vinyl veneer replaced. Only cosmetic
issues with this unit are some black marks on the right side / end of
the unit and some minor wear on the top bonnet and minor scuffs to
aluminum face / knobs.
- Following above procedures, all functions
tested for perfect operation and unit was cosmetically detailed inside
and out.
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! All functions tested for perfect operation.
Following restoration procedures, the unit was ran 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!
On
our test bench, each internal amplifier of this particular unit,
#...0011, produced peak power of 14.2 volts @ 8Ω per channel for 25
watts / channel and 12 volts @ 4Ω per channel for 36 watts / channel via
Discrete output devices at 1khz. Bias voltage adjusted to 40 mV per
channel factory specification. AC Idle current at 60mA, & floor noise
<0.3.
Nice
Scott 320R Silver face receiver is great looking with the two-tone dial,
large volume/balance knobs and a nice array of switch controls. The DC
Coupled power amplifier provided uncolored sound directly to the
speakers. The 320R would make a great addition for a small-medium system
or for an office or Bedroom.
Scott 320R Features Include:
- Weighted flywheel analog "slide-rule"
tuning
- PLL tuning circuit
- Double Pair Separate Speaker Switches
providing; A, B , A+B or both Off speaker operation (two pair at a time)
- Separate Bass and Treble featuring Hi-Quality, De-tented pots
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- Oversize volume control featuring Hi-Quality, De-tented pot
- Hi filter for reducing tape hiss / electronic hiss & noise and record
static
- Phono / Turntable input with Built-In Phono
Pre-Amp
- True Tape Monitor with both RCA's and DIN 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® / 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)
- Rear located, Dual speaker output protection fuses
- Rear located, full barrier strip for external antenna connections
- Un-Switched AC convenience outlet on rear panel
Again, we have done the previously
stated refurbishment / restoration work (~8+ hours) on this unit to
insure it's performance, and it gets our full
'Certification' followed up with a 48 hour burn in. All
functions tested for perfect operation.
Only minor cosmetic issues are the
one’s mentioned earlier. This particular unit, after restoration, has a
VERY GOOD TUNER! FM reception STRONG AND
CLEAN!!!
Unit measures 18.5" wide x 12.5" deep x 5.5" high and weighs 12 lbs
unpacked. Comes with our 90 day limited warranty.
SCOTT 320R STEREO RECEIVER
Cond.
8
SOLD 5/1/13
SHIPPING TO CALIFORNIA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
|

NEW LISTING 4/19/13
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE SANSUI STEREO RECEIVER
SANSUI 5000X IN WOOD CABINET
#...3882
CIRCA 1973-76
MIJ
SOLD 4/23/13
SHIPPING TO INDIANA
ü
Our technician has completely gone through
and 'Certified' this unit.
ü
Everything was cleaned inside and out including all contacts, switches
and controls.
ü
We also
aligned the tuner for optimum AM & FM performance as older internal
tuner components have always drifted on vintage gear over the years.
VERY GOOD TUNER!
AM reception WAY above average, FM reception incredible, PUNCHY and
IMPECCABLY CLEAN!!!
due
to the triple FET FM front end and the quality of the restoration.
ü
All
meter, dial, function indicator and FM stereo indicator lamps replaced
for trouble-free service (very difficult to do on this series of
receiver and there's a total of 12).
ü
All 4
power transistors removed, tested for leakage and reinstalled with fresh
heat-sink compound.
ü
DC offset
checked
(although as it’s a ‘cap couple’ amp, there better not be any DC) and bias current adjusted to correct levels.
ü
Two stuck
dual section controls were replaced and shafts lubed.
ü
Damaged
illuminated dial indicator was replaced.
ü
Entire
unit cleaned / detailed cosmetically inside and out. Only cosmetic
issues with this unit are some scuffing of the wood cabinet and very
minor wear on the face.
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! All functions test fine.
ü
Following
restoration procedures, the unit was run continuously at medium volume,
as all our amplifiers / receivers are, into a load with "Loudness" on
and both Tone Controls at 10 for 48 hours
and into a 4 Ohm Load!
On our test bench, each internal amplifier of this
particular unit, #...3882, produced peak power of 22 volts @ 8Ω per
channel for 60 watts / channel and 19 volts @ 4Ω per channel for 93
watts / channel via Discrete output devices at 1khz. (4X Toshiba metal
case TO-3 2SC1079). AC Idle current at .220A, & floor noise <1.4
mVAC.
____________________________
This is from what many consider to be one of Sansui's best eras. The
Sansui 5000X 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 quite a few
'X000' series Sansui units and they are among some of the best sounding,
'vintage', 'main stream' amplifiers we have heard. Lot's 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.
Sansui 5000X Features include:
- Weighted flywheel, 'slide rule' style analog tuning
- Dual Tuning Capacitors. One for FM and one for AM. Allows for
incredibly 'quiet' tuning performance
-
A, B, C, Off, A+B or A+C speaker positions
- Hi filter for reducing
tape hiss / electronic hiss & noise and record static
- Low filter to eliminate excess rumble from sources such as turntables
- Pre-Amp Out / Power-Amp In Loop (unique to the "X" version)
- Aux (may also be used for
Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® /
iGadget / MP3 / XM® / SIRUS® etc.)
input
- Dual tape monitors with Tape 1 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, 8-Track Tape Cartridge Decks, 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) -
Dual Phono / Turntable inputs
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
-
FM Stereo / Mono selector separate from the FM Muting selector
- Stereo / Mono selector for Pre-Amp separate from the FM tuner
selector
- Stereo Reverse selector (great for trouble-shooting speakers)
-
FM Muting separate from the Stereo / Mono selector (this is commonly
‘combined’ on many units)
-
Rear located MPX Separation & Level adjustments
- Front mounted 1/4" stereo headphone jack
- Front mounted 1/4" Microphone Input jack and 1/4" Playback Jack (Tape
2)
- Tuning window features dual VU meters for tuning and signal strength
- Rear located speaker and main power protection fuses
- Externally located, vertical heat sinks for very efficient cooling
and long life - Dual AC convenience outlets on rear panel with 1 switched
and 1 un-switched
- Triple Pair Speaker Selector: A, B, or C or A+B or A+ C or Off
speaker selector (two pair at a time)
- Tuning window features dual meters for 'Tuning' & station 'Signal
Strength'
- Rear located speaker and main power protection fuses
- EXTERNALLY located, Vertically finned heat sinks for very
efficient cooling and long life. External heat sinks keep the heat
producing transistors outside of the receiver housing where they belong.
All units should utilize this design.
- Built-In Ferrite 'Stick' AM antenna
- Dual AC convenience outlets on rear panel with 1 switched and 1
un-switched
-
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 Sansui 5000X Specifications:
POWER / PRE AMP SPECIFICATIONS:
Music Power: 200watts dynamic @ 4 Ohms
160 watts dynamic @ 8 Ohms
Cont rated RMS Power: 2 x 60 watts @ 8 Ohms, 20-20k & <0.5% THD
THD: <0.5% @ full rated power
IMD: <0.8% @ full rated power
Power Bandwidth (IHF): 15Hz-30kHz
Damping factor: 50 @ 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: ±13dB @ 50hz
Treble Control: ±13dB @ 10khz
High Filter: -13dB @ 10kHz
Low Filter: -13dB @ 50Hz
"Loudness" Contour: +8dB @ 50hz & +3dB @ 10kHz (volume control
@ -30dB)
TUNER SPECS FOR FM:
Tuning Range: 88-108mHz
Capture Ratio: 1.5dB
S/N: > 65db Stereo
Select6ivity: >45 dB
Image Frequency Rejection: >93 dB at 98 MHz
IF Rejection: > 90dB at 98 MHz
Spurious Response Rejection: >95dB
THD 65dBf @ 1kHz, Mono: <0.8%
Stereo Separation Ratio: >35dB @ 50Hz to 10kHz
TUNER SPECS FOR AM:
Tuning Range: 535-1605kHz
IF (Image Frequency) Rejection: >90dB @ 1kHz
Selectivity: >30dB @ 1kHz
Useable Sensitivity (External Antenna / Bar Antenna): 15 μV/m /
250 μV/m
PHONO SECTION SPECS:
Freq Response: 20-20kHz
Channel Separation: > 40dB
Input Sensitivity: 2.5 mV @ 50kΩ
Max input: ~200 mV @ 50kΩ
Again, as
stated before, we have completely gone through this Sansui 5000X, Stereo
Receiver cleaning and testing all and it gets our full
'Certification'. This is probably the 'cleanest'
Sansui Receiver in the optional wood case from this era we've ever had.
This Sansui 5000X is also in the originally optional Walnut Wood
Veneer Case that is in great condition and really sets its look. Very
‘Handsome’ unit. Receiver looks, performs and sounds great! 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. Includes a pdf 'e' copy of a '5000-Series' owners manual.
Measures 17.25" wide x 14.5" deep x 5.5" deep and weighs a whopping
34 lbs
unpacked. Comes with our standard 90 day
limited
warranty.
SANSUI 5000X STEREO RECEIVER W/ WOOD CABINET
Cond.
8.5+++
SOLD 4/23/13
SHIPPING TO INDIANA
(C) M.R.
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW ADDITION 4/16/13
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE PIONEER STEREO RECEIVER
PIONEER SX-750 SX750
CLASSIC SILVER FACE RECEIVER
#...119S
Circa 1976-78
MIJ
for sale
SOLD 4/22/13
MICHAEL B. IN HAWAII
Our technician has completely gone through
and 'Certified' this unit.
- This receiver has had complete service
including all switches, contacts, and controls cleaned for static free
performance.
- Entire unit completely cleaned inside and
out.
- All dial, meter, indicator, 'Power', 'FM'
and 'Stereo' lamps replaced with new unit for trouble-free service.
-
Dial lamps “aqua” tinted
for factory new appearance. All other indicator lamps replaced.
- Power cord replaced with polarized plug for
quiet operation.
- Power transformer secondary's checked for correct
output voltage
- Power Supply, Rectifier and Protection
circuits all “reflowed” for improved reliability.
('original' capacitors on the power supply / rectifier board are common
issue on the SX-750 for some reason. We don't see it so much on other
models. No issues once corrected with fresh caps)
- Power Supply filter electrolytic capacitors
replaced with new, ‘audio grade’ caps, as well as protection and
regulator capacitors.
- We also aligned the tuner front-end for
optimum performance as older tuner components have drifted over the
years.
VERY GOOD TUNER! FM reception incredible
and IMPECCABLY CLEAN!!!
-
All
inputs and outputs tested and both sides produce clean and even sine
waves into static 8 & 4 ohm loads at full power! No power supply hum of
any kind. It's dead silent!
All functions test fine.
Wood grained vinyl case also in decent shape with a few 'battle scars',
but nothing too distracting (see photos).
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
and into a 4 Ohm Load! All functions
test perfectly.
The Pioneer SX-750
was originally rated for 50 watts, but both internal power amplifiers on
this unit, #...119S produced 22 volts at 8 ohms per channel for 64
watts / channel and 18 volts at 4 ohms per channel for 84 watts /
channel via discrete, metal cased, TO-3 output devices (2SB541 x
2, 2SD388 x 2) at 1khz. Bias set to 30 mV for each channel after
15 min warm-up.
AC idle draw 0.2A @ 117VAC. Floor noise measured @ <0.3mVAC.
____________________________
The famous and well-built Pioneer SX-750. Many classic Pioneer receiver
fans feel that the SX-xx50 series are better designed internally and are
better built units than the SX-xx80 series for many reasons such as
‘beefier’ output transistors, more ‘serviceable’ circuit boards and
internal shielding on ‘noise critical’ sections.
Features include:
- Heavy, Weighted analog flywheel tuning with fully lit
"Slide Rule" dial
- A, B, A+B & speaker Off speaker selector
- Separate Bass and Treble tone controls featuring high quality
de-tented pots
- Tone Bypass for purest signal path
- Hi filter centered at 6kHz
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- 2-position De-emphasis at 25 & 75 m-sec
-
FM muting, separate from FM stereo selector
- Stereo / Mono mode selector for Pre-Amp section (separate from ‘FM Stereo’ selector)
- Dual analog meters for Signal Strength and FM Center Tuning
- Dual 'TRUE' tape monitors with Tape 2 having 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, 8-Track Tape Cartridge Decks,
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)
- Phono / Turntable input with built-in phono preamp
- AUX Input (may also be used for Video / CD / DVD / VCR / DAT / MP3 /
iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Front mounted 1/4" Microphone input
- 2 AC outlets (1 switched @ 100 watts / 1 un-switched @ 300 watts
capacity)
Original Pioneer SX-750 Specifications:
POWER / PRE AMP SPECIFICATIONS:
Cont rated Power: 2x 50 watts @ 8 Ohms / 20-20kHz / 60 watts @ 4 Ohms
THD;
0.1% @ 25w to full rated power / 0.05 THD @ 1 watt
Intermodulation Distortion (50 Hz-7 KHz=4:1 @
Aux In):
0.1% at full power / 0.05% 1W to 25W
Potential Freq Response; measured @ 1w; 10-50,000Hz ±0.0dB
IMD utilizing AUX; 0.1% @ full rated power / 20-20kHz
Damping factor:
30 @ 8Ω / 20-20kHz
Signal / Noise Ratio:
100dB
Input Impedance:
50k Ohms
Input Sensitivity for Full Output:
1V
Input Sensitivity AUX / Tape: 150mv @ 50kΩ
Input Sensitivity Phono:
2.5mV @ 50kΩ
Input Sensitivity Mic:
5mV @ 50kΩ
Tape Output level: 150mv
Bass Control: +8 dB / -7dB @ 100hz
Treble Control: +7 dB / -6dB @ 10khz
Low Filter: -6dB /Oct @ 15hz
"Loudness" Contour: +6dB @ 100hz, +3dB @ 10khz (w/ volume set at -40dB)
TUNER SPECS FOR FM:
Freq Response:
30-15kHz
S/N
Stereo: > 67db
S/N
Mono: > 72db
Useable Mono Sensitivity:
10.7 dBf
Mono RF Sensitivity:
1.9 μV
Stereo usable Sensitivity: 9.8 μV
Capture Ratio:
1.0dB
Signal for 50dB quieting, Mono:
4.0 μV
Signal for 50dB quieting, Stereo:
50.0 μV
Signal for 50dB quieting, Mono:
17.2 dBf
Signal for 50dB quieting, Stereo:
39.2 dBf
De-Emphasis:
selectable 25/75 μ-sec
THD w/ 100% modulation @ 1kHz, Mono: 0.15%
THD w/ 100% modulation @ 1kHz, Stereo:
0.30%
IF image Rejection: 85dB
IF Rejection: 100dB
Stereo Sub-Carrier Rejection: 62dB
AM Carrier Rejection:
55 dB
Spurious Rejection:
62 dB
Alternate Channel Selectivity: 80dB
wide or narrow
Stereo Separation @ 1kHz: 40dB
TUNER SPECS FOR AM:
RF Sensitivity:
300 uV/meter or 15 uV @ binding posts
Alternate Channel Selectivity:
35 dB
IF Rejection:
65 dB
Image Rejection:
40 dB
Signal to Noise Ratio:
50 dB
PHONO SECTION SPECS:
Freq Response:
20-20kHz
S/N:
70 dB, ref w/ 10mV input
Input Sensitivity:
2.5 mV
@ 50kΩ
Overload limit:
200 mV
Again, we have done the previously stated refurbishment / restoration
work (17+ hours!) on
this unit to insure it's performance, and it gets our full
'Certification'.
All functions tested for perfect operation.
This unit is in good condition however, there are a few minor veneer
peels, and minor dings to the front panel edges,
but nothing too distracting. The
face is clean with only minor “dings” on the top. The unit includes the
original milled aluminum knobs! Again VERY GOOD
TUNER! FM reception incredible and
IMPECCABLY CLEAN!!! Performs and sounds wonderful!!! If you're
looking for one of these series you won't be disappointed in this one.
Measures 19" wide x 15" deep x 6" high and weighs 41 lbs unpacked.
Includes our standard 90 day limited warranty!
PIONEER SX-750
COND. 8+
$489.
SOLD 4/22/13
MICHAEL B. IN HAWAII
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|

NEW LISTING 4/15/13
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE KENWOOD STEREO RECEIVER
KENWOOD KR-4070 KR4070
AM/FM STEREO RECEIVER
#...0774
Circa '77-'81
MIJ
SOLD 5/1/13
SHIPPING TO CALIFORNIA
Our
technician has completely gone through and 'Certified' this unit.
Everything was cleaned inside and out including all switches, controls
and contacts.
- Internal fuses checked for correct value / function and
replaced where necessary.
- Controls tightened to chassis.
-
Main
circuit board repaired and damaged resistors replaced.
-
Tuner MPX IC
replaced.
- All output transistors removed and
individually tested. Fresh heat sink compound used of course.
-
Amplifier section had output bias and DC offset adjusted to spec levels.
-
All dial, meter and stereo indicator lamps were replaced.
- We also aligned the tuner front-end, FM MPX and dial alignment
on both AM & FM bands for optimum performance as older tuner components
will have 'drifted' over the years.
INCREDIBLE TUNER! AM reception
WAY above average, FM reception incredible,
PUNCHY
and MUSICAL
and
IMPECCABLY CLEAN!!!
-
Only cosmetic issues with this unit are minor scuffing on the
bonnet and minor scratches on the face near the tuning knob) and a
slight ‘off-center’ to the tuning knob when ‘spun’
(see photos above).
-
Following above
procedures, all functions tested for perfect operation and unit was
cosmetically detailed inside and out.
-
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! All functions tested for
perfect operation.
-
Following restoration procedures, the unit was ran 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!
On our test bench, each internal amplifier of this particular unit,
#...0774, produced peak power of
20 volts per
channel for 50 watts per channel @ 8 ohm and 17.5 volts @ 4 ohm for 76
watts per channel via discrete output devices
at 1khz. (2X
2SD588 & 2X 2SB618). AC Idle current at .3A, & floor noise <0.1 mVAC and
DC offset adjusted to a SUPER LOW <5mV L&R.
____________________________
Wonderful condition, late 70's silver face receiver from Kenwood.
Great performance for a 'mid-sized' 2-Channel audio system. This is an
INCREDIBLEY ‘Musical’ sounding receiver. The tone / pre-amp section very
transparent and ‘glassy’ sounding, even with only the FM tuner as a
source! Nice looking classic brushed aluminum face and knobs with only
minor scuffs.
Kenwood KR-4070 Features:
-
Weighted flywheel analog slide rule tuning
- A, B, A&B speaker selector
- Separate Bass and Treble controls utilizing high quality de-tented
pots
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- FM auto/muting and mono selection
- Dual Analog back lit meters for center tuning and signal strength
- Phono / Turntable input with Built-In Phono
Pre-Amp
- 'True' Tape Monitor with a DIN input as well as the standard 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® / 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 input (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Built-in AM ferrite antenna
- Dual 200 watt convenience AC outlets with one being switched for a
total of 400 watts capacity
Original Kenwood KR-4070 Specifications:
POWER / PRE AMP SPECIFICATIONS:
Power output: 40wpc min RMS @ 8 Ohms & no more than 0.1% THD @
20-20kHz
40wpc min RMS @ 8 Ohms & no more than 0.1% THD @ 1kHz
50wpc min RMS @ 4 Ohms & no more than 0.1% THD @ 1kHz
THD: <0.05% @ 1 watt / 1kHz & <0.1% @ full rated power into 8 ohms
IHF IMD: 0.1% @ full rated power, 0.05% at 1 watt @ 8 Ohms
Freq Response of power amp section: 10-40,000kHz
Damping factor: 40 @ 8Ω / 1kHz
Power Bandwidth: 10-40,000Hz
TUNER SPECS FOR FM:
Usable Sensitivity: 10.8 dBf (1.9 uV)
Tuning Range: 87.4- 109.7MHz
Freq Response: 20
– 15 KHz +-.5dB, -2 dB
S/N @ 65dBf: >72db Mono or 67dB Stereo
Capture Ratio: 1.0 Db
Image Response Ratio: 45 dB
Spurious Response Ratio: 75 dB
TUNER SPECS FOR AM:
Useable Sensitivity: 6 uV
Signal to Noise Ratio: 50 dB
Image Rejection: 50 dB
Selectivity: 34 dB
PHONO SECTION SPECS:
Freq Response: RIAA Standard curve +_0.3 dB, -0.3 dB
Input Sensitivity: 2.5mV @ 47K ohms/73 dB
Maximum Phono Input Level: 190 mV, THD 0.% at 1 KHz
Again, we have done the previously stated refurbishment /
restoration work (~9+ hours) on this unit to insure its performance, and
it gets our full
'Certification'. All functions tested
for perfect operation. This receiver has an awesome tuner. Other
than the previously mentioned wear, this unit is in great
cosmetic condition! Looks and sounds great! Measures 18.5"
wide x 6" tall x 16.5" deep and weighs an impressive 21
lbs unpacked. Includes our standard 90 day limited
warranty.
Cond. 8.5
KENWOOD KR-4070 STEREO RECEIVER
SOLD 5/1/13
SHIPPING TO CALIFORNIA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|



NEW
ADDITION 12/7/12
(Click on
above thumbnails to enlarge photos)
warranty
VINTAGE STEREO
RECEIVER
SANSUI 2000X
#...1261
Circa '73-76
"WORLD AC POWER"
™
MIJ
SOLD 1/14/13
SHIPPING TO NORTH CAROLINA
Our
technician has completely gone through
and 'Certified' this unit. Everything was
cleaned inside and out including all contacts, switches, controls and
I/O jacks. Control Pot shafts re-sprung. Internal and external fuses
checked and replaced where necessary.
We also aligned the tuner for optimum AM & FM performance as older
internal tuner components have always drifted on vintage gear over the
years. All meter, dial, and FM stereo lamps replaced for trouble-free
service (very difficult to do on this series of receiver). All 4 power
transistors removed and fresh heat-sink compound applied. Tuner string
re-tensioned and flywheel string 'grip' improved.
Amplifier section had output bias and DC offset adjusted to spec
levels.
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. All inputs 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. 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
and into a 4 Ohm Load!
While this unit was originally rated at 55 wpc, on our test
bench, both this unit's amplifiers, #...1843 produced peak power of 17
volts per channel @ 8 ohms for 36 watts and 14.7 volts @ 4 ohms for 54
watts per channel via discrete, TO-3, metal cased outputs with 1 kHz
input. (4x Sanken 2SC1111, (same as Toshiba 2SC793)).
DC offset adjusted to and measured at 2.6mVDC L&R. Idle current draw
within spec. Floor noise measured at 6mVAC w/ AUX shunted.
____________________________
This 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. Lot's 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.
Features include:
-
Weighted flywheel, 'slide rule' style analog tuning
- Dual Tuning Capacitors. One for FM and one for AM. Allows for
incredibly 'quiet' tuning performance
- 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, 8-Track Tape Cartridge Decks,
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)
- Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPad® / iPhone® / iTouch® / iGadget / 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 trouble-shooting speakers)
- FM Muting
separate from the Stereo / Mono selector
- FM MPX
filter
- 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
SPECS:
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 beautiful condition as well. 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 our standard 90 day limited
warranty.
SANSUI 2000X STEREO RECEIVER
Cond. 8.5+
SOLD 1/14/13
SHIPPING TO NORTH CAROLINA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|
Did you know?
Sansui was founded in 1947, just after WWII as a company manufacturing
transformers (one of the most important components of any audio system).
During the Sixties they morphed into what would become one of the most well
respected companies in quality audio gear. I have owned and sold some
incredible Sansui stereo gear from the Seventies and early Eighties. I
worked at a Sansui dealer in the early part of the Eighties. Sansui remained
a major force in stereo gear until about the mid Eighties, when the vast
majority of audio gear started suffering from the 'how cheaply can we get
it' syndrome by consumers, thus manufacturers followed suit, by building
cheaper and cheaper gear.
|


NEW
LISTING
10/13/12
(Click on above
thumbnails to enlarge photos)
warranty
VINTAGE STEREO
RECEIVER
SANSUI 5000A
#...0112
Circa
~1970- ~'72
MIJ
SOLD 2/23/13
SHIPPING TO GEORGIA
Our
technician has completely gone through and 'Certified'
this unit. Everything was cleaned
inside and out including all contacts, switches and controls. We also
aligned the tuner for optimum AM & FM performance as older internal
tuner components have always drifted on vintage gear over the years. All
meter, dial, function indicator and FM stereo
indicator lamps replaced for trouble-free service (very
difficult to do on this series of receiver and
there's a total of 12). All 4 power transistors removed
and tested for leakage. DC
offset and bias current adjusted to correct levels. Entire unit
cleaned / detailed cosmetically inside and out. All inputs 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. 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
and into a 4 Ohm Load!
While this unit was originally rated at 55 wpc, on our test
bench, both this unit's amplifiers, #...0112
produced peak power of ~20.45
volts per channel @ 8 ohms for 52 watts and 16.5 volts @ 4 ohms for
68
watts per channel via discrete, TO-3, metal cased outputs with 1 kHz
input. (2x Toshiba 2SC1079 & 2x 2SD118).
Idle current measured at 260mA. Bias current & DC offset / output
adjusted to levels within spec. Floor noise measured at
<4mVAC.
____________________________
This is from what many consider to be one of Sansui's best eras. The
Sansui 5000A stereo receiver. The "A" suffix designates upgraded
driver boards over the original '5000'. 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. Lot's
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.
Sansui 5000A Features include:
-
Weighted flywheel, 'slide rule' style analog tuning
- Dual Tuning Capacitors. One for FM and one for AM. Allows for
incredibly 'quiet' tuning performance
- Speaker Damping Selector
- A, B,
C, A+B,
A+C, 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
- 'Dual, TRUE' tape monitors
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, 8-Track Tape Cartridge Decks,
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 Head' direct input. Allows older 'transport
only' Reel to Reel decks to operated as well as inputs from 'modified'
Reel to Reel tape decks that have 'direct outputs' from the tape
playback head to bypass the tape decks built-in electronics.
- Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Tape B to Tape A Dubbing capability
- Phono / Turntable input with Built-In Phono Pre-Amp
- "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
('FM Auto')
- Pre-Amp
Stereo / Mono selector
- Stereo
Reverse selector (great for trouble-shooting speakers)
- FM Muting
separate from the Stereo / Mono selector
- FM MPX
filter
- Rear
located MPX Separation
- Rear Located 'Level' (output power limiter). Limits
the amount of output someone can send to speakers as this unit is
capable of fairly high power output.
- FM Dist / Loc selector
-
Rear located 'Speaker Damping Hi-Lo' Selector
- Front
mounted 1/4" stereo headphone jack
- Tuning
window features VU meter for 'Tuning' & station
'Signal Strength'
- Rear
located speaker and main power protection fuses
- EXTERNALLY located, Vertically finned heat sinks for very efficient
cooling and long life. External heat sinks keep the heat producing
transistors outside of the receiver housing where they belong. All units
should utilize this design.
- Built-In
Ferrite 'Stick' AM antenna
-
Dual AC convenience outlets on rear panel with 1 switched and 1
un-switched
Sansui 5000A Original Specifications:
POWER / PRE AMP SPECIFICATIONS:
Music Power: 90watts dynamic @ 4 Ohms
70 watts dynamic @ 8 Ohms
Cont rated RMS Power: 2 x 55 watts @
8 Ohms, 20-20k & <0.1% THD
THD; <0.8% @ full rated power
IMD; <0.5% @ full rated power
Power Bandwidth (IHF); 10Hz-50kHz
Damping factor; 50 @ 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
Input Sensitivity 'Tape Head';
2mV
Bass Control; ±12dB @ 50hz
Treble Control; ±12dB @ 10khz
High Filter;
-13dB @ 10kHz
Low Filter; -13dB @ 50Hz
"Loudness" Contour; +8dB @ 50hz & +4dB @ 10kHz (volume control
@ -30dB)
TUNER SPECS FOR FM:
Tuning Range; 88-108mHz
Freq Response; 30-15kHz
Capture Ratio; 1.5dB
S/N; > 60db Stereo
20dB Quieting Sensitivity Mono; 1.4μV
FM Alternate Channel Selectivity; >50dB
Spurious Radiation; <34dB
Spurious Response Rejection; >90dB
Image Rejection Ratio; >90dB
THD 65dBf @ 1kHz, Mono; <0.2%
Stereo Separation Ratio: >35dB @ 50Hz to 10kHz
TUNER SPECS FOR AM:
Tuning Range; 535-1605kHz
IF (Image Frequency)
Rejection; >90dB @ 1kHz
Selectivity; >30dB @ 1kHz
Useable Sensitivity (External Antenna
/ Bar Antenna);
15 μV/m / 250 μV/m
PHONO SECTION SPECS:
Freq Response; 20-20kHz
THD; 0.8% @ 200 mV @ 1kHz
Input Sensitivity; 2.5 mV @ 50kΩ
Max input; ~200 mV @ 50kΩ
Again, as
stated before, we have completely gone through this
Sansui 5000A, Stereo Receiver cleaning and
testing all and it gets our full
'Certification'
. This is the first
Sansui 5000A we have refurbished in a few years.
Other than some scuffs / scratches around the
headphone jack, the aluminum face
and knobs in like great condition. Unit looks and sounds great! 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.
Includes a pdf 'e' copy of
a '5000-Series' owners manual.
Measures 17.25"
wide x 14.5" deep x 5.5" deep and weighs a whopping
30 lbs unpacked. Comes with our standard
90 day limited
warranty.
SANSUI 5000A STEREO RECEIVER
Cond. 8.5
SOLD 2/23/13
SHIPPING TO GEORGIA
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details)
|


NEW
LISTING
7/13/12
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE SANSUI STEREO RECEIVER
SANSUI 8080 RECEIVER
#...1680
CIRCA 1977-79
MIJ
SOLD 1/7/13
SHIPPING TO MICHIGAN
Our
technician has completely gone through and 'Certified'
this unit.
Everything was cleaned inside and out including all switches (actually accessed (requires 'splitting'
the unit horizontally) and fully flooded), controls and contacts for quiet,
positive operation.
Extra attention is ALWAYS necessary on Sansui 8080 / 9090 units
to the 'Input Selector'
and
'Dolby / Tape-Monitor' switches, and they were completely disassembled,
thoroughly cleaned, burnished, had contacts 're-sprung' and tested (only
about half the 990's, 8080's and 9090's have input selector switches that
will respond to cleaning only). On this unit, he actually bypassed the wafer
portion that routes the dial light current, and direct wired the lights to
be lit constantly
(the
issue with the dial lights on Sansui 880 / 8080-DB / 990 / 9090-DB series
receivers is that the contacts were, by design, too anemic to handle the 1
Amp+ current they require). He also re-flowed all dial lamp
solder joints, especially at the 'extremes' of the board. Now dial lamps
light solidly and inputs sonically intact.
DC measurements taken
'post-preamp', 'post driver board' and 'post power amp'. 'Sansui
2624-Driver-Board 'removed, inspected / tested component by component &
contacts burnished. Once reseated, DC measurements re-taken. Once driver
board was tested, then the tech moved to address the output transistors.
All output transistors removed and individually tested.
Fresh heat sink compound used of course. Green
'LED' Power indicator's 'current limiting' circuit components replaced as
necessary.
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.
VERY GOOD TUNER! Generally AM reception in a stereo receiver is treated
as an 'after thought', but the AM reception on this 8080,
#...1680 is WAY above average.
VERY GOOD TUNER!
FM reception as well great and IMPECCABLY CLEAN!!!
All dial, all meter
(including the very difficult to replace power meter lamps
),
all function indicator and stereo indicator lamps replaced with new units
for trouble-free service. Dial light solder contacts
re-flowed. Also we 'painstakingly' replaced the 'dial pointer' lamp.
The dial string was cleaned and re-tensioned. Once unit's electronics were
addressed, the unit was cosmetically detailed inside and out.
The extruded aluminum
face
great shape after detailing. The knobs are intact,
but do have numerous 'flea bits' and minor scuffs on them. Internal
and external dial screen and window in perfect shape. We
removed the dial window and re-finished the black mask behind it. The lower
wood strip that would normally be on the bottom of the face plate is
missing. All inputs tested, including phono input,
and both amplifiers 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. The Walnut wood grain, vinyl wrapped in good condition with minor
wear. Following restoration procedures, the unit was operated 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
and into a 4 Ohm Load!
On
our test bench, this particular Sansui 8080, #...1680,
amplifiers each produced
27.8 volts per channel for 96
watts per channel @ 8 Ω via discrete output &
23
volts per channel for 132 watts per channel @
4 Ω via discrete, Metal cased, original TO-3 outputs (Sanken
4x 2SC1116 output transistors).
(AC draw at idle 280mA tested,
DC offset adjusted to <0.5mV each side.)
___________________________
Here's the second Sansui
8080 we've had, that's made it all the way through
our restoration with no 'terminal' issues, since 2003!
These receivers are known for great AM/FM tuners, and amplifiers that you
can "darn near weld with".
The
tuner quality on both AM & FM is exceptional due to aspects such as a fully
shielded tuning capacitor
. The amps are incredibly
warm sounding with HUGE punch and headroom.
Very "Musical" sounding with real output transistors and huge power
supplies. A testament to the strength of the power supply is that the
results we achieved on the test bench.
The difference in tone of an 8080, with a 'clean bill of health', and
most other receivers is astronomical. Sort of like the difference between
driving a 130hp car and a 400hp car or a 350cc bike and and 1100cc Harley.
It's a difference that must be experienced to be appreciated.
Features include:
-Weighted flywheel analog, 'slide rule' dial tuning
- HUGE internal Power Supply
- Real Metal Cased, TO-3 output transistors for lot's of punch and
tone!!!!
-Huge, EXTERNALLY LOCATED, 'Vertical' heat sinks for the most efficient
passive cooling (all units should follow this example. Keeps the heat
outside the unit, where it belongs)
- 4-Way Protection (Fuses 'on everything', Thermal Protection, DC surge
Protection, and a 'Current Limiter')
- A, B, A+B & Off speaker selector
- Classic and handsome''SLIVER
FACE'
- Gorgeous "Aqua" back-lit slide rule face and tuning meters (amber
back-lit power meters)
- 6-Gang tuning capacitor
- PLL tuning circuit
- Analog 'Tuning' and 'Signal' strength VU meters
- Dual Analog 'Power' / 'Dolby' Calibration VU meters
- Separate Bass, Midrange and Treble controls utilizing high quality
de-tented pots
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- FM Muting Selector (separate from the 'Stereo' selector)
- Stereo / Mono selector for all inputs
- Hi filter for reducing tape hiss / electronic hiss & noise and
record static
- Built-in 'Low' Filter to eliminate excess rumble from sources such
as turntables
- -20dB Audio Muting for instant lowering of volume without adjusting
the volume control. Great for ringing phones and cuing a record on your
turntable
- Phono / turntable inputs with Built-In
Phono Pre-Amp
- Dual tape monitors with Tape monitor 'B' also featuring a DIN input
as well as the standard 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® / 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 'Dubbing' capability
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 /
iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Dolby Loop can be used as an additional input or as a signal processor
loop for EQ, Dynamic Range Expanders, Reverbs, Delays, DBX units, etc.
- Microphone input with Level Control (turns the unit into the
ultimate Karaoke Machine (be very careful with your speakers when inserting
a mic into a stereo receiver)
- 1/4", stereo headphone jack
-Bi-Color 'Power-Protection' indicator
- Pre-Amp / Power-Amp I/O loop
- External AC main line protection fuse
- 2x AC convenience outlets 1 switched and 1 un-switched with a total
output capacity of 250 watts
Original Sansui 8080 Specifications:
POWER / PRE AMP SPECIFICATIONS:
RMS Power, Continuous
Rated: 2 x
80 watts @ 8 Ohms & <0.2%
THD
@
20Hz-20,000Hz
&
2 x
90 watts @ 8 Ohms & <0.2%
THD
@ 1kHz
Rated
Freq Response of
power amp section;
measured @ 1w; 10-30,000Hz
+/-1dB
THD;
measured @
80w
RMS = <0.2%
IMD;
measured @
80w
RMS = <0.2%
Hum and Noise; 80dB on AUX / Tape
w/ 150mV input
Damping factor;
30 @ 8Ω / 1kHz
Input Sensitivity; 150mV
@ 50kΩ
on AUX
/ Tape
Pre-Amp Output
Level 1 or 2;
775mV
Main Power Amp Input
Sensitivity;
775mV @ 100kΩ
Bass Control; ±10dB @
50hz
Mid Control; ±10dB
@
1.5khz
Treble Control; ±10dB @ 10khz
"Loudness" Contour; +8dB @
50hz, +6dB @ 10khz
(w/ volume set at -30dB)
Low Filter; -10dB @
50Hz @ 6dB Oct
High Filter; -10dB @
10kHz @ 6dB Oct
DOLBY NR Effect; -10dB
@ 'Tape' and 'Dolby FM' (which doesn't exist anymore for 'FM', but works
for Dolby Tapes)
MAX Power Consumption;
650 watts
TUNER SPECS FOR
FM:
Tuning Range;
88-108mHz
Freq Response; 30-15kHz
Capture Ratio; <1.5dB
S/N: > 70db Mono
/ >65db Stereo
FM
Alternate Channel Selectivity;
>85dB
AM Suppression Ratio;
>55dB
Image Response Ration;
>70dB
@98Mhz
IF
Response Ration;
>95dB @98Mhz
Spurious
Noise Ratio;
>85dB
@98Mhz
Stereo Separation;
>35dB
@ 100Hz
>40dB @ 1kHz
>28dB @ 10kHz
Useable 50dB Mono Sensitivity (IHF);
3.0 μV / 14.7 dBf
Useable 50dB Stereo Sensitivity (IHF);
36 μV / 36.3 dBf
Useable Mono Sensitivity; 9.8dBf
/ 1.7μV
THD 65dBf @ 1kHz, Mono; <0.2%
@ 1V
THD 65dBf @ 1kHz, Stereo; <0.3%
@ 1V
TUNER SPECS FOR
AM:
Tuning Range;
535-1605kHz
Useable Sensitivity; 50dB / m with
ferrite stick antenna
Selectivity;
>50dB @ 1kHz
Image Response Ration;
>30dB @ 1kHz
IF
Response Ration;
>30dB @ 1kHz
PHONO SECTION
SPECS:
S/N;
>70dB
Input Sensitivity for rated output of 125 wpc
RMS; 2.5 mV @ 50kΩ
Max input;
180mV RMS @
1kΩ
w/ <0.2% dist
This
Sansui 8080 classic stereo receiver is great
looking and fabulous sounding! Again, we have done EXTENSIVE refurbishment /
restoration work (~16+ hours) on this unit to
insure it's performance, and it gets our full
'Certification'.
With the exception of a few very
minor 'tic' marks on knobs, the face plate &
window
are in great cosmetic condition (see photos
above). The 'typically broken' Sansui 8080 AM
antenna socket
still intact and 'un-broken'.
The Walnut grain, vinyl wrapped case is
in great shape
with only minor wear! Looks VERY impressive and
sounds great! This thing is incredible when lit up at night or in a dark
room!! Includes an 'e-copy' of the Sansui 9090 owners
manual
(will be applicable to the 8080) & Service manual. Measures 21.5"
wide x 7.25" tall x 15.75" deep
and weighs
and heavy 46
lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI 8080 STEREO RECEIVER
Cond. 8.5
(C)
M.R.
SOLD 1/7/13
SHIPPING TO MICHIGAN
(Above text, in it's entirety, property of
www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright
Information' page for details) |


NEW LISTING
7/28/128
(Click on above thumbnails to enlarge photos)
warranty
CLASSIC
SANSUI STEREO RECEIVER
SANSUI 350A
#...0707
Circa '73-75
"WORLD
AC POWER" ™
MIJ
SOLD 2/27/13
SHIPPING TO MARYLAND
Our
technician has completely gone through and 'Certified'
this unit.
Everything was cleaned inside and out
including cleaning inside and out including all contacts, switches and
controls. Speaker switch replaced with another, original
Sansui 350A speaker switch. 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.
All meter and dial lamps replaced for
trouble-free service.
Amplifier section had output bias and DC offset adjusted to spec
levels.
All inputs 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. 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
and into a 4 Ohm Load!
On our test bench, both this unit's amplifiers produced peak power of
12.5 volts per channel @ 8 ohms for 19 watts and
10.4 volts @ 4 ohms for 27
watts per channel via discrete, TO-3, metal cased outputs with 1 kHz input.
(4x Hitachi 2SC1030). AC
Idle current at .1A, DC offset output <4mvDC
either channel. Floor noise at 2.5mVAC either
channel.
____________________________
This Sansui 350A stereo receiver
would be great in a smaller office, bedroom, cabin system! Classic Silver,
Smoke and Wood grain look. Green, backlit dial screen. Brushed face with
black knobs.
Features include:
- Weighted
flywheel analog tuning
- A or B speaker selector
- Separate Bass and Treble controls
- Stereo / Mono selector
- MPX Filter for removing the 19kHz pilot tone from FM broadcasts
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- Phono / Turntable input
-
TRUE' 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® / 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 Input (may also be used for Video / CD / DVD / VCR / DAT / MP3 / XM
/ SIRUS etc.)
- Front mounted 1/4" stereo headphone jack
- Analog VU Signal Strength meter for AM & FM tuning
- Built-in ferrite AM stick antenna
- DX / Local tuner sensitivity switch on rear panel
- Switched AC convenience outlet on rear panel
- True “WORLD AC POWER
as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts
AC
Sansui 350A Receiver specifications:
POWER / PRE AMP SECTION:
Freq Response / Bandwidth of power amp section;
@ 20 watts / 8Ω
30-30,000 Hz
THD utilizing AUX;
< 1.0% @ rated output
Damping factor; 45 @ 8Ω full bandwidth
Signal / Noise ratio; 70dB @ AUX / Tape
65dB @ Phono MM
Input Sensitivity AUX / Tape; 150mV w/ 100k ohms impedance @ 1kHz
Channel Separation with AUX or Phono @ 1kHz;
> 50 dB
Bass Control Characteristics; ±10dB @ 50hz
Treble Control Characteristics; ±10dB @ 10khz
"Loudness" Contour; +8dB @ 50Hz & +3 @ 10kHz
TUNER SPECS FOR FM;
S/N; > 60db Stereo
20 dB Quieting Sensitivity:
Mono 2.5 μV
Capture Ratio; 3dB
FM Selectivity; >32 dB
Spurious Response Ratio; >70 dB
AM Suppression Ratio; 65 dB
FM separation; >30dB @ 400Hz
TUNER SPECS FOR AM;
Useable Sensitivity; 350μV / m with loop antenna @ 1kHz
Selectivity; >20dB
Spurious Response Ratio; >55dB
PHONO SECTION SPECS;
Input Sensitivity; 2.2 mV w/ MM w/ 5k ohms impedance @ 1kHz
Again,
as stated before, we have completely gone through this
Sansui 350A, stereo receiver, cleaning and
testing all and it gets our full
'Certification'. Brushed aluminum face and knobs in like NEW condition.
Unit looks and sounds great. Wood grained, vinyl case in
great condition. Includes an 'e' copy of the
original Sansui 350A brochure. Measures 16.5" wide x 13" deep x 6"
tall and weighs 24 lbs unpacked. Comes with our standard 90 day
limited warranty.
CLASSIC SANSUI 350A RECEIVER
Cond. 8.5
SOLD 2/27/13
SHIPPING TO MARYLAND
(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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NEW ADDITION 5/9/12
(Click
on above thumbnails to enlarge photos)
warranty
VINTAGE TECHNICS
STEREO RECEIVER
SA-222
#...E488
Circa 1982-86
MIJ
SOLD 2/23/13
SHIPPING TO ARIZONA
Our
technician has completely gone through and 'Certified'
this unit.
Everything was cleaned inside and out
including all switches, contacts, and controls cleaned
for static free performance, complete cleaning inside and out, analog dial
scale lamp replaced and all functions tested. We inspected and cleaned the
tuner back-up battery compartment.
Amplifier section had output bias and DC offset adjusted to spec
levels.
Following bench service, unit had a full
cosmetic detail inside and out. All inputs 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! 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
and into a 4 Ohm Load!
On
our test bench, each internal amplifier of this particular unit,
Technics SA-222, #E488 produced 19
volts @ 8 Ω per channel for 45 watts /
channel and 15 volts @ 4 Ω per channel for
56 watts / channel via
STK-2028 Power Pack.
(DC offset output adjusted to: <5mV on each side. AC draw at idle
<0.3A
tested.)
____________________________
Nice
Technics, SA-222 stereo receiver. Classic silver faced construction and a
nice sleek style. This unit is ideal for a small office or dorm room.
Features include:
- Digital, Quartz Lock AM / FM tuning
- Auto or Manual station scanning
- 14 Random AM and FM station presets with battery back-up
- Fluorescent Digital station readout
- 5-Segment LED signal strength meter
- Auto selector for tuning scanner
- Very Unique Analog style tuning scale that automatically moves an analog
pointer to a position relative to the digital frequency readout
- De-tented, separate Bass & Treble
- "Loudness" function to boost Bass relationship to Mid frequencies at
lower volume levels for a much fuller sound.
- FM muting / Stereo / Mono selector
- Phono / Turntable input
- Dual
'TRUE' 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® / 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® / iGadget / MP3 / XM® / SIRUS® etc.)
- Front mounted
¼"
stereo headphone jack
- Main & Remote speaker positions
- An AC convenience un-switched outlet on rear panel with for 150 watts
capacity
Again,
as stated before, we have completely gone through this
Technics SA-222, stereo receiver, cleaning
and testing all and it gets our full
'Certification'.
These are great all around
receiver for small to medium sized systems. We have used a
Technics SA-222 in one of our offices for years!
Unit looks and sounds great! Measures 17" wide x
12.5" deep x 5" tall and weighs an impressive 12 lbs unpacked. Includes our
standard 90 day limited warranty.
Technics
SA-222
Cond. 8.5
SOLD 2/23/13
SHIPPING TO ARIZONA
(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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NEW ADDITION
4/27/12
(Click on above
thumbnails to enlarge photos)
warranty
VINTAGE
PIONEER STEREO RECEIVER
SX-720
(Same model as Pioneer SX-3600)
#...1190S
CIRCA 1980-82
MIJ
SOLD
1/8/13
SHIPPING TO OHIO
Our
technician has completely gone through and 'Certified'
this unit.
Everything was cleaned inside and out
including all
contacts, switches and controls. AM & FM tuner re-aligned and front-end
adjusted for optimum performance. All dial and tuning
meter lamps were replaced as well as the power
back light bulb.
Amplifier section had output bias and DC offset adjusted to spec
levels.
All inputs 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. 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
and into a 4 Ohm Load!
On
our test bench, the internal amplifiers of this particular unit Pioneer
SX-720 stereo receiver, #...1190S, produced
a strong 19.2 volts per channel @ 8 ohms for
46 watts and 15.8 volts
@ 4 ohms for 62 watts per channel via discrete
outputs with 1 kHz input. (2x NEC D883A & 2X
NEC B773A output transistors.)
(DC offset output adjusted to: <13mV on each side. AC draw at idle 0.25A)
____________________________
Nice looking
and performing, 'Silver-Faced' Pioneer SX-720 stereo receiver. Essentially
the replacement for the famously, 'most sold of any stereo receiver ever
made' model Pioneer SX-780 stereo receiver.
Features include:
- Weighted
analog flywheel tuning with BLACK 'Slide Rule' scale.
- Separate Bass and Treble utilizing super quality de-tented tone controls
- A, B, & A+B or Off speaker selector
- Rear mounted AM Stereo output via single RCA jack
- Mono / Stereo / FM Muting selector
- Dual 'TRUE' 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® / 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 input (AUX 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)
- Phono / Turntable input with Built-In Phono Pre-Amp
- "Loudness" function to boost Bass and Treble in relationship to Mid
frequencies at lower volume levels for a much fuller sound.
- Dual 12 segment Blue Fluorescent power meters
- Front mounted 1/4" stereo headphone jack
- Dual AC convenience outlets on rear panel (1 switched 1 un-switched)
with a total capacity of 150 watts.
- Built-in AM ferrite "stick" antenna.
Again,
as stated before, we have completely gone through this
Pioneer SX-720,
cleaning and testing
all and it gets our full
'Certification'.
Brushed aluminum
face and all original, milled knobs in fabulous shape. Wood grain, vinyl
wrapped case in great shape as well. Unit looks, performs and sounds
great! Measures 17.75" wide x 12" deep x 5.5" high and weighs 19 lbs
unpacked. Includes our standard 90 day limited warranty!
PIONEER SX-720 / SX-3600 STEREO RECEIVER
Condition 8.5+
SOLD
1/8/13
SHIPPING TO OHIO
(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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We've moved the
"SOLD
/ ARCHIVED"
items to their own page.
Click ........HERE.
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** "(actual as measured)" refers to original test results done by
Hirsch-Houck Laboratories upon test release of product when new. Current
"aged" specifications / performance may of course vary from that.
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