NEW LISTING 5/9/19
(Click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE MARANTZ STEREO RECEIVER / CASSETTE TAPE DECK
MARANTZ 4025 'CASSEIVER' (aka MCR-425)
AM/FM STEREO RECEIVER / CASSETTE DECK
#...0181
Circa 1978-80
SOLD 7/30/19
SHIPPING TO TIM IN TENNESSEE
  Our technician has completely gone through and 'Certified' this unit.

ü We have completely gone through this unit cleaning everything including all switches, controls and contacts. VERY time consuming to properly service this unit, especially the 8-track deck. Extensive cleaning of unit internally.

ü Internal fuses checked for continuity and correct values. No issues found, fortunately. We don't like seeing incorrect fuses having been installed in a unit as that could mean it had prior issues, or if a fuse value was 'increased' it could have allowed too much current through an 'ailing' circuit causing un-due / un-necessary damage.

ü Controls were 'flooded' w/ 'De-OxId' and are quiet

ü Entire transport was disassembled down to the chassis, and every mechanical part was cleaned of "varnished" lubes and re-lubed as well as the always at issue, Pinch Roller plunge assembly, re-lubed and reassembled (VERY DIFFICULT and TIME CONSUMING on this unit)

ü Main drive belt has been replaced with NEW for trouble free service (#42-1975 and counter belt replace with #030).

ü Capstan flywheel removed, cleaned, burnished and re-lubed prior to re-install. Entire transport and mechanism has been cleaned, re-lubed and de-magnetized.

ü Heads have been cleaned and de-magnetized and are in great shape.

ü Head alignment and azimuth at 125Hz, 1kHz and 10kHz adjusted for BOTH directions for 'peak performance' with O-Scope and w/ STL and TEAC MTT-257H calibration / alignment tapes. Both channels now even output.

ü Meters adjusted to even zero with symmetric with Volt meter, O-Scope and w/ STL and TEAC MTT-257H calibration / alignment tapes. Both channels now even output.

ü Both Internal playback amplifier channels adjusted with Volt meter, O-Scope and w/ STL and TEAC MTT-257H calibration / alignment tapes. Both channels now even output.

ü Meters adjusted to even zero with symmetric input with Volt meter, O-Scope and w/ STL and TEAC MTT-257H calibration / alignment tapes. Both channels now even output.

ü Both Internal Record amplifier channels adjusted with Volt meter, O-Scope and w/ STL and TEAC MTT-257H calibration / alignment tapes. Both channels now even output.

ü Record signal path contacts cleaned and burnished for static-free performance

ü Linear Record switch cleaned so no 'Motor Boating' effect

 ü Internal playback, meter and record level pots also adjusted w/ O-scope.

ü Following refurbishment, Speed checked with factory test tape to 100% accuracy! (meaning in this case, that our 1000Hz test tape plays back at 1000Hz on our Freq Counter Meter)

ü Deck 'sonically' checked for WOW and Flutter with no appreciable issues

ü Record Meters adjusted for 'even' readout and performance

ü Pinch Roller replaced with new, as following initial transport overhaul, we found that occasionally, on certain tapes the original / old pinch roller would 'crinkle / wrinkle' the tape

ü Floor noise of receiver tested @-60dBm. Floor noise of cassette deck measured with 'blank' Fuji tape at 1.75mVAC.

ü Tuner string checked for any fraying then re-tensioned to increase traction & relieve flywheel binding and re-centered pointer to correct dial position.

ü We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! FM sounds fantastic. AM is decent as well.

ü All dial, indicator & meter lamps work or were replaced.

ü Stereo indicator lamp working

ü We also checked the heat sink compound which should be good for another 30 years.

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.
Total restoration time investment 16+ hours.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.

ü On our test bench, each internal amplifier of this particular unit, #...0181, produced peak power of 16 Volts per channel for 28 Watts per channel @ 8 Ohm and 13 Volts @ 4 Ohm for 42 Watts per channel @ 1khz from actual discrete output transistors (2x 2SA1060 and 2x 2SC2484) (ALL the other 'compacts' we were working on utilized STK power pack, which had some to do with why we couldn't resurrect many of them. The DC was just too high in many cases, and couldn't be rectified practically).
ü AC Idle current at <.35A, & floor noise-60dBm.
ü DC offset checked to <30mVDC / channel (VERY good for a 'compact' unit and as good or better than many separate components).
  ____________________________
  
So, as with anything you want to look up on the 'world wide interweb', you will find a myriad of opinions. Many of them are from folks who have never even personally experienced what they are 'spouting off' about. Well, of course, I have mine too, however, mine will be from someone who does have 'personal experience' with whatever I'm 'expounding' about, and is from 'real world' experiences, 'down in the trenches'. I often get a 'kick' out of what folks have to say (generally negative) about a piece of gear, with no actual, personal experience. Recently read so many opinions of a speaker we had just finished and were about to audition, prior to auditioning them, that I was not holding out much hope for their final performance. Not only was I surprised by their actual performance (in a positive way), they were completely the antithesis of what EVERY opinion on the web stated, with NONE of them ever actually hearing them (they all stated so in their opinions). Anyway, I'll climb down from my 'ivory tower' for a moment just to say that for what this is designed to be it really came out as a wonderful unit following it's 18+ hours of service to bring it back to essentially 'new' condition. Wonderful condition, and for a 'compact system' REALLY GREAT SOUNDING, late 70's, silver face 'Combo' Receiver from Marantz. We've had this for years, but just recently got around to restoring it. We had a few 'compacts' from brands such as Sony, Panasonic, Fisher, Marantz, but most did not pan out (didn't even attempt the 'cheeeeeese' from companies like Electrophonic, GE, Lloyds, Sound Design, Symphonic and a host of other 'bottom feeder' units.

It really is surprising in sonics, performance, feel and quality. Great performance for a 'small to mid-sized' 2-Channel audio system. This is the only the second or third 'compact' to 'pass muster' in the past couple decades (I think the last one was about 1998 or 99 and shipped to Germany and then the Panasonic we recently posted as well).
This is an INCREDIBLY ‘Musical’ sounding receiver. Lot's of surprising 'punch' and volume.
Yes, I know, it's a 'compact' and not a 'separate component', but it really is that nice!!! Enough power for up to 'medium-large' / 10" woofer speakers.
Interestingly, this unit also has the most extensive 'spec listing' of any unit we've ever posted, even over such units as a Pioneer SX-1980 (not even considering that it's 2 units in one). And, the specs are quite respectable in most aspects!

Marantz 4025 / MR425 Features:
  
Receiver features:
- Weighted flywheel, analog, slide rule tuning
- Separate Bass and Treble controls utilizing high quality de-tented pots
- Oversize volume control,utilizing high quality de-tented pot
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- FM Muting (separate from 'Stereo / Mono' switch)
- Stereo / Mono selector (Separate from 'FM Muting' switch)
- LED Stereo Indicator
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Phono / Turntable input with Built-In Phono Pre-Amp
- Tape Input from built-in cassette deck (not for signal processor insertion)
- Tape Output RCA jacks (Record Out / 'Pre-Volume', Line Level output jacks for any Source)
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)
- Microphone Input to tape (be careful with your speakers if using an 'open / live' mic with home-audio speakers)
- A, B, or A+B speaker selector
- Standard 1/4" Stereo Headphone jack
- Built-in, internal AM ferrite antenna
- Externally located 'Mains' protection fuses located on rear panel
- Un-switched convenience AC outlet with 200 Watts capacity

Cassette Deck features:
- Stereo Playback and Recording 
- Super-Hard, 'Permalloy' PB / REC head
- 2-Position Tape Recording Bias selector
- 2-Position Tape EQ selector (for PB and REC)
- Dolby B NR
- Dual Back-lit, analog, Record Level VU level meters for Record and PB levels
- Separate L & R Input level controls or 'Auto-Level' Limiter
- Locking Fast Forward and Re-Wind
- 'Pause' function
- Analog / Mechanical Tape Counter
- Standard / 1/4" microphone inputs mounted on the front panel
- Microphone Input
- Rear mounted RCA I/O's

MARANTZ 4025 SPECIFICATIONS:

POWER / PRE AMP SPECIFICATIONS:
THD; 0.1% @ full rated power @ 1kHz.
Power Frequency bandwidth of power amp section; 16-30,000Hz
Frequency bandwidth of Pre-amp section; 18-24,000Hz (measured at AUX)
 IMD utilizing AUX; 0.1% @ full rated power / 20-20kHz and 8 Ohms
 Damping factor; 30 @ 8Ω full bandwidth
RMS rated Power: 2 x 25 Watts @ 8 Ohms or 30 Watts @ 4 Ohms
Headphone Jack Load Impedance; 8 Ohms
  Hum and Noise; >80dB on AUX / Tape
Input Sensitivity AUX / Tape; 180mV @ 20kΩ
Channel Balance @ 0 to -40dB / 40-16kHz; 1.5dB ALL inputs
Inter-channel Crosstalk; 47dB (non-Phono)
Record Out Levels / Impedance; 500mV / 220 Ohms @ 1kHz
Bass Control; likely approx ±10dB @ 10hz
Treble Control; likely approx ±10dB @ 20khz
High Filter; -10dB @ 8kHz @ 12dB Oct!
"Loudness" Contour;  likely approx +8dB @ 50hz, +3dB @ 10khz (w/ volume set at -30dB)

TUNER SPECS FOR FM:
Tuning Range; 87.4 - 109MHz (a bit wider than most tuners!)
Freq Response; 30-15kHz (limited by FCC)
S/N (Weighted); > 62db Stereo w/ 1mV input
Usable Sensitivity @ 40kHz Deviation & @ 98 Mhz:
Mono; (1.7 uV)
Stereo; 60 uV)
Capture Ratio; 1.0dB (approx)
IF Rejection; >90dB
Alternate Channel Selectivity @ 98mHz (±300kHz); >65dB
Image Response Ratio: 50 dB
Spurious Response Rejection: 90 dB
AM Supression; 50dB
Pilot Signal & Subcarrier Rejection: 19kHz = 58 dB & 38kHz = 58 dB
THD w/ 100% modulation Mono; 0.2%
THD w/ 100% modulation Stereo; 0.3%
Stereo Separation; >42dB
Channel Balance; 1.0dB
Output Voltage @ 1kHz; 600mV
Output Impedance @ 1kHz; 4.4k Ohms
Ant Terminals; Balanced 300 Ohms / Un-balanced 75 Ohms

TUNER SPECS FOR AM:
Tuning Range; 525-1620kHz (a bit wider than most tuners!)
Useable Sensitivity @ 26dB S/N, 30% Modulation @ 1Mhz; 20 uV with ferrite stick antenna
Image Rejection @ 1 Mhz; 41dB
IF Rejection @ 1 Mhz; 55dB
Selectivity @ 1 Mhz ± 9kHz: 20dB
Spurious Response Rejection @ 1 Mhz: 38 dB
THD w/ 100% modulation Mono; 1.0%
Freq Response; 40- ~ 2.2kHz
S/N @ 1 Mhz: > 43db

PHONO SECTION SPECS:
Freq Response; RIAA Standard Curve +/- 2dB.
S/N; >72 dB
Input Sensitivity; 2.7 mV @ 47kΩ
 Overload 'Margin'; 31dB
Inter-channel Crosstalk; 45dB (Phono)

Cassette Deck Specifications:
 
Track format: 4 track / 2 channel
Motors: 1x DC Servo Controlled
Tape Speed: 1 7/8 ips / 4.75 cm/sec
Heads: 2x; RP Super-Hard Permalloy. Erase is Ferrite
Recording System: AC Bias
Erasing System: AC Erase
Meters: Standard VU
Overall Frequency Response (Dolby Off);
40-14kHz +/- ~3db w/ Ferric Oxide Tape @ -20dB
40-13.5kHz +/- 3db w/ CrO2 Tape @ -20dB
40-12.5kHz +/- 3db w/ 'Normal' Tape @ -20dB
Harmonic Distortion / THD:
3.0%  w/ Ferric Oxide Tape @ -20dB
3.0% w/ CrO2 Tape @ -20dB
2.2% w/ 'Normal' Tape @ -20dB
Wow & Flutter (WRMS): 0.18% wtd
S/N ratio w/ CrO2 tape: >52dB w/ Dolby B OFF & >58dB w/ Dolby B ON (over 5kHz and and High Bias Tapes)
Line Input Level and Impedance ('Nominal'): 22dB @ 20K Ohms
Microphone Input Level and Impedance ('Nominal'): 72dB @ 10K Ohms
Line Output Level and Impedance ('Nominal'): 500mV @ 2K Ohms
Fast Wind Time: ~105 Seconds for C-60 tape

General Specifications:
AC / Mains Power Requirements; 120 VAC @ 60Hz
Power consumption; Idling Current 28Watts & 130 Watts at rated Output both channels
Semiconductor Complement:
Integrated Circuits; x7
Transistors; x61
Diodes; x43
Field Effect Transistors; x1
Weight: Stand alone; 28.6 lbs / 13.0 kgs & Originally packed; 33.0 lbs / 15.0 kgs

Again, we have done the previously stated refurbishment / restoration work (~16+ hours) on this unit to insure its performance, and it gets our full 'Certification'. All functions tested for perfect operation. Overall, it is in great cosmetic condition! Looks and sounds great! Measures 22.5" wide x 6.5" tall x 16.5" deep and weighs 29 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8.5
Marantz 4025 / MRC425 Stereo Receiver / "Casseiver"
SOLD 7/30/19
SHIPPING TO TIM IN TENNESSEE

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

 

    

 

NEW LISTING 12/14/17
(click on above thumbnails to enlarge photos)
warranty
STEREO / QUADRAPHONIC
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE STEREO RECEIVER SANSUI QUADRAPHONIC / 4-CHANNEL / 2-CHANNEL STEREO RECEIVER
SANSUI QRX-7500 RECEIVER
#...0232
Circa 1973-75
"WORLD AC POWER" ™
 M.I.J.
SOLD 1/4/19
SHIPPING TO ED IN FLORIDA

ü  Our technician has completely gone through and 'Certified' this unit.

ü  We have completely gone through this unit cleaning everything including all switches, controls and contacts. Extensive cleaning of unit internally.

ü Internal fuses checked for continuity and correct values. No issues found, fortunately. We don't like seeing incorrect fuses having been installed in a unit as that could mean it had prior issues, or if a fuse value was 'increased' it could have allowed too much current through an 'ailing' circuit causing un-due / un-necessary damage.

ü  Controls were 'flooded' w/ 'De-OxId' and are quiet

ü Tuner string checked for any fraying then re-tensioned to increase traction & relieve flywheel binding and re-centered pointer to correct dial position.

ü  We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! AM seems to be an 'afterthought' on many stereo receivers and component tuners. The AM is above average for a 'stereo receiver' on this SANSUI QRX-7500. 

ü All dial, indicator & meter lamps 'proactively' replaced for a TOTAL OF 26!!!

ü  We also checked the heat sink compound which should be good for another 30 years.

ü Amplifier section had output bias adjusted to spec levels of ~24.8mVDC on all four amplifiers.

ü  DC offset adjusted to VERY LOW levels on all four amplifiers.

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.
Total restoration time investment 15 hours.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
 
On our test bench, this particular QRX-7500, #...0232, 'FRONT' amplifiers each produced 18 Volts per channel for 40 Watts per channel @ 8Ω via discrete output & 15 Volts per channel for 56 Watts per channel @ 4Ω
and
REAR' amplifiers each produced 11.5 Volts per channel for 16+ Watts per channel @ 8Ω via discrete output & 10 Volts per channel for 25 Watts per channel @ 4Ω
via discrete, Metal cased, TO-3 outputs.
(AC draw at idle .5A tested. DC as follows
FR = -1.0 mVDC
FL = +1.0 mVDC
RR = +2.5 mVDC
RL = -2.5 mVDC
(Floor noise measured at >60dBm / 0.1mVAC)
 ___________________________
 
HUGE and VERY IMPRESSIVE looking, Sansui, brushed silver, QUAD receiver, surrounded by handsome, real Walnut wood veneer side plates. This unit has THE highest 'KPD-Factor' of any we've had in a long time. What's a 'KPD Factor'? 'Knobs per Dollar! You could also say it has very high 'MPD' and 'LPD' factors as well (you should be able to figure those out now). Features gorgeous, back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. 'Heavy' built, machined aluminum knobs and button caps, also make this unit a pleasure to 'feel'. One of the most 'fun' receivers I've used in a long time. Would love to abscond with this one myself.
Sansui QRX-7500 Features include:
  
- Quadraphonic (sometimes spelled "quadriphonic" or "quadrophonic") / Stereo receiver 
- Weighted flywheel analog tuning
- A, B, Off or A+B Front and Rear speaker positions
- Separate Front and Rear, Bass and Treble controls
- Balance controls allow complete blending between Front and Rear / Left and Right
 - Built-in Hi and Sub filters (separately switchable Front and Rear) for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
- FM muting
- ''Function Control' selector for 2-Channel Stereo, & 4-Channel modes of ''QS Synthesizer' (To convert (synthesize) conventional, 2-channel / stereo program sources to 4-Channel stereo output), 'QS Regular Matrix' (to decode and reproduce 4-channel program sources (records, tapes and their respective broadcasts),  ''Phase Matrix' (to decode and reproduce 4-channel program sources, encoded with the CBS / SQ matrix system) or 'CD-4 / Discrete' (when wishing to hear discrete 4-channel tapes or CD-4 (Quadradisc) records).
- Aux inputs for both Front and Rear (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)
- Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's for both Front and Rear
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
-  Dual Phono / Turntable inputs with Built-In Phono Pre-Amp, featuring 'Phono-2' compatible with 'CD-4' cartridges
- Loudness control for increasing 'rock-n-roll smile' tone curve at lower volumes
- Front and Rear 1/4" stereo headphone jacks for connection of either 'stereo' headphones, or 'quadraphonic / 4-channel' headphones
- Tuning D’Arsonval meters for tuning and signal strength
- Quad VU meters for channel levels
-'CD-4' Level adjustments located on front panel for Carrier Level, and L/R Separation of Quad discs / records.
- Rear located, full barrier strip for external antenna connections
- Rear located main AC protection fuse
- Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 250 Watts of accessories
  - True “WORLD AC POWER"™
   as it will work on both 50 or 60 Hz AC and voltages from 110-240 Volts AC

Sansui QRX-7500 Original Specs:

 POWER / PRE AMP SPECIFICATIONS:
THD; 0.3% @ full rated power @ 1kHz.
 Freq Response of power amp section; 30-30kHz @ 1W
 Power bandwidth of power amp section; 10-30,000Hz ±0dB
 IMD utilizing AUX;
 0.3% @ full rated power / 20-20kHz and 8 Ohms
 Damping factor; 40 @ 8Ω full bandwidth
Dynamic rated Power: 2 x 180 Watts @ 8 Ohms or 260 Watts @ 4 Ohms
Cont rated Power:
4x 32 Watts @ 8 Ohms / 1kHz (BOTH channels driven)
4x 52 Watts @ 8 Ohms / 1kHz (each channel driven)
4x 35 Watts @ 4 Ohms / 1kHz (each channel driven)
4x 28 Watts @ 8 Ohms / 1kHz (ALL channels driven)
4x 25 Watts @ 4 Ohms / 1kHz (ALL channels driven)

  Hum and Noise; >80dB on AUX / Tape
Input Sensitivity AUX / Tape; 100mV @ 50kΩ
Record Out Levels; 100mV
Bass Control;  ±12dB @ 50hz (most amp tone controls are only +/- 10dB)
Treble Control;  ±12dB @ 15khz (most amp tone controls are only +/- 10dB)
Low Filter;  -10dB @ 50Hz @ 6dB Oct
High Filter;  -10dB @ 10kHz @ 6dB Oct
"Loudness" Contour;  +8dB @ 50hz, +3dB @ 10khz (w/ volume set at -30dB)

TUNER SPECS FOR FM:
Tuning Range; 88-108MHz
Freq Response; 30-15kHz (limited by FCC)
S/N; > 65db Stereo w/ 1mV input
Mono Sensitivity; 1.9 μV
Capture Ratio; <2.0dB
IF Rejection; >90dB
Image Rejection; >75dB
Spurious Noise Ratio; >80dB
Selectivity; >60dB
THD w/ 100% modulation Mono; 0.3%
THD w/ 100% modulation Stereo; 0.5%
Stereo Separation; >37dB

TUNER SPECS FOR AM:
Tuning Range; 535-1605kHz
Useable Sensitivity; 50db/m with ferrite stick antenna
Image Rejection; >80dB
IF Rejection; >80dB
Selectivity; 25dB

PHONO SECTION SPECS:
Freq Response; 20-20kHz RIAA Standard Curve +/- 1dB.
S/N; >70 dB
Input Sensitivity; 2.5 mV @ 50kΩ
 Overload limit; 150mV w/ 0.5% THD @ 1kHz

CD-4 DEMODULATOR:
Input Sensitivity; 2.5mV (adjustable 1 TO 10mV)
Input Impedance; 50kΩ
Freq Response (STD test signal); Main Channel 30-15kHz, Sub Channel 30-10kHz

 Power consumption; 140 Watts at rated
  
Again, as stated before, we have completely gone through this SANSUI QRX-7500 Quad receiver, cleaning and testing all and it gets our full 'Certification'. Everything is in fabulous electrical and cosmetic condition! Looks near new and sounds great! AMAZING looking when lit up at night or in a darkened room! Again, this unit is a 'blast' to use. It just simply 'feels nice'!
Comes with an 'e-copy / PDF download of the SANSUI QRX-7500 owners / users manual, and the service manual if the purchaser desires.  Measures 23.5" wide x 8" tall x 14.5" deep and weighs an impressive 55 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI QRX-7500 STEREO RECEIVER
Cond. 8.5+++
SOLD 1/4/19
SHIPPING TO ED IN FLORIDA

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
 
 

    



       NEW LISTING 6/21/19
(click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE SANSUI STEREO QUADRAPHONIC / 4-CHANNEL / 2-CHANNEL STEREO RECEIVER
SANSUI QR-4500 RECEIVER
#...0983
Circa 1973-75
"WORLD AC POWER" ™
M.I.J.
SOLD 9/3/2020
SHIPPING TO MICHAEL IN IDAHO

ü Our technician has completely gone through and 'Certified' this unit.

ü We have completely gone through this unit cleaning everything including all switches, controls and contacts. Extensive cleaning of unit internally.

ü Internal fuses checked for continuity and correct values. No issues found, fortunately. We don't like seeing incorrect fuses having been installed in a unit as that could mean it had prior issues, or if a fuse value was 'increased' it could have allowed too much current through an 'ailing' circuit causing un-due / un-necessary damage.

ü Controls were 'flooded' w/ 'De-OxId' and are quiet

ü Tuner string checked for any fraying then re-tensioned to increase traction & relieve flywheel binding and re-centered pointer to correct dial position.

ü We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! AM seems to be an 'afterthought' on many stereo receivers and component tuners. The AM is above average for a 'stereo receiver' on this SANSUI QR-4500. 

ü All dial, indicator & meter lamps checked. Dial and meter lamps replaced w/ original spec 6.3V / 250mA.

ü We also checked the heat sink compound which should be good for another 30 years.

ü Driver boards removed and had their 'edge connectors' burnished.

ü Amplifier section had output bias adjusted to service manual spec levels of on all four amplifiers.

ü NOW all 4 amplifiers have 'even' clipping on 'plus' and 'minus' rails.

ü DC offset adjusted to VERY LOW levels on all four amplifiers.

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.
Total restoration time investment 12+ hours.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
 
ü On our test bench, this particular QR-4500, #...0983, 'FRONT and REAR' amplifiers each produced 15.5 Volts per channel for 30 Watts (160 WPC peak) per channel @ 8Ω via discrete output & 13Volts per channel for 42 Watts (240 WPC peak) per channel @ 4Ω via discrete, Metal cased, TO-3 outputs.
ü AC draw at idle .3A tested. DC 10-15mV any single channel.
ü Floor noise measured at >-60dBm / 0.1mVAC
 ___________________________
 
HUGE and VERY IMPRESSIVE looking, Sansui, brushed silver, QUAD receiver, surrounded by handsome, real Walnut wood veneer side plates. This unit has about THE highest 'KPD-Factor' of any we've had in a long time. What's a 'KPD Factor'? You'll find out when you call to order it.
Features gorgeous, back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. 'Heavy' built, machined aluminum knobs and button caps, also make this unit a pleasure to 'feel'. One of the most 'fun' receivers I've used in a long time.
Regarding some of the 'Quad' aspects, from the original Sansui QR-4500 brochure, "It's exclusive, built-in, 2-4 Synthesizer Encoder helps the QS regular matrix system convert all of your 2-channel / stereo records, tapes and FM stereo broadcasts into more exciting 4-channel sound than ever.  It has 'Phase Matrix' circuitry that takes advantage of Sansui's exclusive front-rear logic to decode all SQ system records too, with superb front-rear separation...And for even greater versatility, the unit comes complete with an extra set of discrete 4-channel inputs, permitting you to connect a 'demodulator' to play "discrete" records".

Sansui QR-4500 Features include:
  
- Quadraphonic (sometimes spelled "quadriphonic" or "quadrophonic") / Stereo receiver 
- Weighted flywheel analog tuning
- A, B, Off or A+B Front and Rear speaker positions (separately)
- Separate Bass and Treble controls (front speakers)
- Balance controls allow complete blending between Front and Rear / Left and Right
 - Built-in Hi and Sub filters (separately switchable Front and Rear) for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
- FM muting to reduce 'hiss' in between stations (most handy for trouble-shooting speakers / drivers and system overall)
- ''Function Control' selector for 2-Channel Stereo, & 4-Channel modes of ''QS Synthesizer' (To convert (synthesize) conventional, 2-channel / stereo program sources to 4-Channel stereo output), 'QS Regular Matrix' (to decode and reproduce 4-channel program sources (records, tapes and their respective broadcasts),  ''Phase Matrix' (to decode and reproduce 4-channel program sources, encoded with the CBS / SQ matrix system) or 'CD-4 / Discrete' (when wishing to hear discrete 4-channel tapes or CD-4 (Quadradisc) records).
- Dual Aux inputs for both Front and Rear (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)
- Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's for both Front and Rear
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
-  Dual Phono / Turntable inputs with Built-In Phono Pre-Amp, featuring 'Phono-2' compatible with 'CD-4' cartridges
- Loudness control for increasing 'rock-n-roll smile' tone curve at lower volumes
- Pre-Out / Power-Amp In loops on rear panel for all amps
- Front and Rear 1/4" stereo headphone jacks for connection of either 'stereo' headphones, or 'quadraphonic / 4-channel' headphones
- Tuning D’Arsonval meters for signal strength
 - Front mounted Dual 1/4" stereo headphone jacks
 - 4 Externally mounted speaker protection fuses on rear panel
 - 4 Separate sets of speaker output connectors on rear panel
 - AM Local / Distant selector on rear panel
- Rear located, full barrier strip for external antenna connections
 - Built-in AM Ferrite Stick antenna
- 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 350 Watts of accessories
  - True “WORLD AC POWER"™
   as it will work on both 50 or 60 Hz AC and voltages from 110-240 Volts AC

Sansui QR-4500 Original Specs:

 POWER / PRE AMP SPECIFICATIONS:
THD; 0.5% @ full rated power
Freq Response of power amp section; 30-30kHz @ 1W
Power bandwidth of power amp section; 20-30,000Hz ±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 160 Watts @ 8 Ohms or 240 Watts @ 4 Ohms
Cont rated Power:
4x 38 Watts @ 8 Ohms / 1kHz (each channel driven)
4x 38 Watts @ 4 Ohms / 1kHz (each channel driven)
4x 23 WPC @ 8 Ohms / 1kHz (ALL channels driven)

Hum and Noise; >70dB on AUX / Tape
Channel Separation; >45dB @ 1kHz @ rated output
Input Sensitivity AUX / Tape; 150mV @ 50kΩ
Record Out Levels; 150mV
Bass Control;  ±15dB @ 50hz (most amp tone controls are only +/- 10dB)
Treble Control;  ±15dB @ 20khz (most amp tone controls are only +/- 10dB)
Low Filter;  -10dB @ 50Hz @ 6dB Oct
High Filter;  -10dB @ 10kHz @ 6dB Oct
"Loudness" Contour;  +8dB @ 50hz, +3dB @ 10khz (w/ volume set at -30dB)
Synthesizer / Decoder; Sansui 'New QS' circuit / Vario-Matrix

TUNER SPECS FOR FM:
Tuning Range; 88-108MHz
Freq Response; 30-15kHz (limited by FCC)
S/N; > 65db Stereo w/ 1mV input
Mono Sensitivity; 2.0 μV
Capture Ratio; 1.5dB
IF Rejection; >80dB
Image Rejection; >80dB
Spurious Noise Ratio; >90dB
Selectivity; >50dB
THD w/ 100% modulation Mono; 0.5%
THD w/ 100% modulation Stereo; 0.8%
Stereo Separation; >35dB

TUNER SPECS FOR AM:
Tuning Range; 535-1605kHz
Useable Sensitivity; 50db/m with ferrite stick antenna
Image Rejection; >100dB
IF Rejection; >100dB
Selectivity; >30dB

PHONO SECTION SPECS:
Freq Response; 30-15kHz RIAA Standard Curve +/- 1.5dB.
S/N; >60 dB
Input Sensitivity; 2.5 mV @ 50kΩ
 Overload limit; 150mV w/ 0.5% THD @ 1kHz
  
Again, as stated before, we have completely gone through this Sansui QR-4500 Quad receiver, cleaning and testing all and it gets our full 'Certification'. Built using super quality, full size, ALPS brand pots. Everything is in fabulous electrical and cosmetic condition! Looks near new and sounds great! AMAZING looking when lit up at night or in a darkened room! Again, this unit is a 'blast' to use. It just simply 'feels nice'!
INCLUDES ORIGINAL BOX & PACKING!!!
Comes with an 'e-copy / PDF download of the Sansui QR-4500 owners / users manual, and the service manual if the purchaser desires. Measures 20.75" wide x 6.75" tall x 12.5" deep and weighs an impressive 41 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI QR-4500 STEREO RECEIVER
Cond. 9+++
SOLD 9/3/2020
SHIPPING TO MICHAEL IN IDAHO
(Cons. R.R.)

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
 
 

    

    

NEW LISTING 10/30/20
(click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE MARANTZ STEREO RECEIVER
MARANTZ 2250
 #...1178
 Circa 1976-77
 Classic 'Blue Face'
 MIJ
SOLD 10/31/20
SHIPPING TO BOB IN TENNESSEE

ü Our technician has completely gone through and 'Certified' this unit.

ü We have completely gone through this unit cleaning everything including all switches, controls and contacts. Extensive cleaning of unit internally.

ü Internal fuses checked for continuity and correct values. No issues found, fortunately. We don't like seeing incorrect fuses having been installed in a unit as that could mean it had prior issues, or if a fuse value was 'increased' it could have allowed too much current through an 'ailing' circuit causing un-due / un-necessary damage.

ü Power switch replaced with #26-855 as well as 'clamping' capacitor

ü Broken 'Dolby' switch repaired and replacement knob sources

ü Controls were 'flooded' w/ 'De-OxId' and are quiet

ü Internal Power supply circuit adjusted to correct 35V output and checked for 'ripple' w/ O-Scope

ü DC Offset adjusted on both R&L to 0mV+/-0.4mV!

ü Bias adjusted to correct 8mVDC

ü We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years.

ü Tuner string checked for any fraying then re-tensioned on Gyro-Wheel to increase traction & relieve flywheel binding and re-centered pointer to correct dial position (after proper tuner, front-end alignment).

ü All dial, indicator & meter lamps 'proactively' replaced (5x Dial & 2x Meter 8V/200mA, 1x Pointer lamp #25-160)

ü We also checked the heat sink compound which should be good for decades.

ü Missing original buttons / knobs replaced from proper donor units as necessary (6 in total)

ü Missing original feet replaced from proper donor units as necessary (all four)

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.

ü Full Cosmetic detail inside and out

Cosmetically the unit is in overall nice shape. There's just a couple of minor scuffs / smudges above the dial window and a 'hairline' scratch on the dial window (see photos above). The balance of the face, knobs and case look good!

On our test bench, this particular Marantz 2250, #...1178 amplifiers each produced 22 Volts per channel for 60 Watts per channel @ 8 Ω via discrete output & 20 Volts per channel for 100 Watts per channel @ 8Ω via discrete, "MARANTZ" branded (originals) TO3 Metal Cased outputs (4x 2SC1343)
AC Idle current at 350mA, DC offset output adjusted to <1mVDC either channel. Bias correctly adjusted to 8mVDC across emitters. Floor noise measured at >-60dBm w/ AUX shorted.)
   ___________________________
   
Classic 'Blue Face' Marantz, 2250 stereo receiver. Elegant looking Face is milled from a solid plank of Aluminum with matching milled aluminum controls. This unit looks great!

Marantz 2250 Features include:
  
- Marantz exclusive "Gyro-Touch" weighted flywheel analog 'Slide Rule' tuning w/ ''PLL' (Phase Locked Loop) circuitry
- A-B, A+B or Off speaker selector
- Separate 'LEFT AND RIGHT' Bass, Mid and Treble utilizing high quality 'Alps' brand pots
- Tone Defeat for purest signal path (if desired)
- Tone centers selectable for either 100 Hz to 250Hz and 1kHz to 4kHz
- 'Pre-Out' / 'Main-In' loop
 - Built-in Hi filter for reducing 19kHz pilot tone and 38kHz Harmonic in FM broadcasts & Tape hiss.
  - Built-in 'Low' Filter to eliminate excess rumble from sources such as turntables
  - FM muting, separate from FM stereo selector and has adjustable level (on rear panel)
 - Stereo / Mono mode selector for Pre-Amp section or FM tuner (depending on function selected)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound
 - Phono / turntable  input
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
- Real 'Tape Monitor Loop' and second 'Tape Input'
  (Tape Monitors can be used with 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)
- Analog VU 'Tuning' & 'Signal Strength' meter
- Dolby FM selector (Broadcasts aren't in Dolby anymore, but if desired, it still does 'Brighten' up your FM sound. I tend to use it when it's an option on tuners)
- Fully shielded tuning capacitor
- Built-In AM 'Stick' antenna
- Antenna attenuator
- 'Quadradial' RCA tuner output (not of much use today)
- 1/4" Stereo Headphone Jack
 - Externally located protection line fuse and additional internal protection fuse bank
- Separated L & R output heat sink sections featuring large, vertically finned heat sinks
 - Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 300 Watts of accessories
  
 Marantz 2250 Stereo Receiver Original Specs:
   "The Marantz 2245 has a continuous power output of 50 Watts per channel @ 8 from 20 hertz to 20,000 hertz with no more than 0.3% THD (measured utilizing AUX input)"
Comparable 'Music' power = 135 Watts
  
POWER / PRE AMP SPECIFICATIONS:
THD: <0.3% @ 8Ω @ full rated power
Freq Response of power amp section;
 @ full rated power 20-20kHz
Dynamic Range; 96dB
IMD utilizing AUX; 0.25% @ 8Ω
Damping factor: >55 @ 8Ω full bandwidth (FYI; twice the damping factor of it's 'little brother' the 2220)
 Input Sensitivity: 180mV for output of 50 Watts @ 8 Ohms
Main Power-Amp in: 1.5V for output of 50 Watts @ 8 Ohms
Input Impedance AUX or Tape: 100k Ohms
S/N AUX: 85dB
Record Out Levels; 180mV
Bass Control;  ±10dB @ 100hz
Mid Control;  ±7.5dB @ 700hz
Treble Control;  ±10dB @ 10khz
Low Filter; 100Hz @ 6dB Oct
High Filter;  7kHz @ 6dB Oct
"Loudness" Contour;  +9dB @ 50hz, +8dB @ 10khz (w/ volume set at -30dB)
 
TUNER SPECS FOR FM:
Freq Response: 30-15kHz
Useable Mono RF Sensitivity: 2.5 μV
Capture Ratio: 1.5dB
THD w/ 100% modulation @ 400Hz, Mono:  0.2%
Spurrious Rejection: 95dB
Image Rejection: 70dB
IF Rejection: 90dB
Selectivity: 60dB
AM Supression: 55dB
 
 PHONO SECTION SPECS:
Input Sensitivity: 1.8 mV @ 47kΩ
Dynamic Range: 98dB!!!
S/N Phono: 75dB!!! (typical would be about 68dB)
Overload: 100mV
  
 Again, as stated before, we have completely gone through this Marantz 2250 Stereo Receiver cleaning and testing all and it gets our full certification. Brushed aluminum face and all original, milled knobs in fabulous shape. After restoration, receiver looks, performs and sounds great! This is a VERY 'Musical' sounding tuner/pre/power-amp. Very 'full, warm and phat'. Great 'low-end' depth at any volume. Tone controls have a lot of influence. Overall a pleasing unit to listen to in all aspects. Measures 17.5" wide x 14" deep x 5.5" high and weighs 35 lbs unpacked. Includes our standard 90 day limited warranty!
MARANTZ 2250 STEREO RECEIVER
Cond. 8.5

SOLD 10/31/20
SHIPPING TO BOB IN TENNESSEE
(CONS. R.R.)

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

   

     

 

 

(OK, do I really need to say it?... No, the laptop shown in the photos is NOT included.)
 

         NEW LISTING 9/4/12
(Click on above thumbnails to enlarge photos)
  warranty
NEW
AUDIO-TECHINCA
PROFESSIONAL / DJ / SOUND SYSTEM / CLUB STEREO TURNTABLE
AT-LP1240USB
DIRECT DRIVE
QUARTZ LOCKED OR MANUAL SPEED CONTROL
FULLY MANUAL
W/ 'REVERSE' PLAY
AND WHEN PURCHASED FROM OAK TREE VINTAGE WITH A NEW, DIAMOND CARTRIDGE NOW INCLUDED
NEW
for sale
Professional DJ / Club table. Quality tool for the 'long haul'! The Audio-Technica AT-LP1240-USB DJ turntable. Similar in design to some of the vintage turntable models, such as the Kenwood KD-550 'concrete base', the Sony PS-T1, and the Technics SL-1500, SL-1700MK2 or SL-D2 turntable models. This professional stereo turntable features a super high-torque, direct-drive motor for quick start-ups yet is perfectly quiet. Classic 'S' shaped tone arm with 'universal' head-shell that allows mounting of most any 'quality', 1/2' cartridge, either MM (moving magnet) or MC (moving coil). Tone-arm mounted in high quality 4-point, Gimbol bearing.

The AT-LP1240-USB plays back 33-1/3, 45 and 78 RPM records (78 is selected by pressing both 'speed' select buttons simultaneously). Its built-in phono preamp enables the turntable to be connected to a wide variety of music and home entertainment systems, powered speakers, and to A/V receivers that do not include a dedicated phono input (de-featable for 'old schooool' and 'REAL' receivers and integrated amplifiers that 'DO' have a built-in phono pre-amp. The turntable includes PC- and Mac-compatible Audacity® software that converts the audio on a record to MP3, WAV or other format digital audio files.

NEW UPDATE--- We're now including the Audio-Technica AT-95E, MM, Elliptically cut diamond cartridge with tables purchased from us at Oak Tree Vintage.

Table has great mass at almost 30 lbs!

Professional features for DJ use in nightclubs, touring & mobile applications:

- Direct drive high-torque motor
- Quartz Locked Speed Control System or 'Manual' Strobe Speed controls
*- Adjustable Braking Rate (0.2 – 6.0 seconds)
*- Adjustable Starting Rate (0.2 – 6.0 seconds)
*- Dual Platter / Motor 'Start' / 'Stop' controls
- Fully-Manual operation
- Selectable 33/45/78 RPM speeds (you will need to acquire a stylus / cartridge designed for playing '78 RPM' records to utilize that feature to it's fullest)
- Professional weight cast aluminum platter with slip mat (no PLASTIC platters here, unlike many of the NEW tables out there!)
- Classic 'S' style tone-arm
- High quality 4-point Gimbol bearing
- ½-inch mount universal head shell
- Strobe monitored, adjustable platter speed
- Fluid damped tone arm cuing
- Adjustable tone-arm counter weight
- Adjustable 'Anti-Skating' control
*- Adjustable Tone-Arm bearing height
*- 45 puck storage pin
- Internal Built-in Phono Pre-Amp of decent quality so if you MUST use this with some sort of 'home-theater-surround-sound-5.1, 7.2, or 8.BR549 receiver' that the manufacturer forgot to include the phono pre-amp on. If you have a 'REAL receiver', ie, an old-school, vintage, 2-channel receiver or integrated amp or pre-amp with a phono pre built-in, then you can flip a switch and bypass the 'built-in' phono preamp.
- USB output—connects directly to your computer for plug-&-play use
- Forward or reverse play (this is a DJ feature, and if you value your vinyl or cartridge, DON'T USE 'Reverse'! If you have a crappy cartridge and are playing 'Frisbees', then 'go for it' if you're so inclined!
- *Comes with Mac- and PC-compatible Audacity software and cables to digitize your LPs
If you appreciate the 'organic' sound of quality vinyl, then disregard the above stuff 'USB / SOFTWARE STUFF' and just 'LISTEN' to your vinyl the way it was meant.

SPECIFICATIONS:

Type: 3-speed, fully manual operation
Motor: High-Torque, 16-pole, 3-phase, brushless DC motor
Drive System: Direct drive
Speeds: 33-1/3, 45, & 78 RPM
Pitch Variation: +/-10%
Turntable Platter: 332mm, Die-cast aluminum
Starting Torque: >4.5 kgf-cm
Braking System: Electronic brake
Wow and Flutter: > 0.1% WRMS (JIS WTD) with 33 RPM
Tone-arm type: Static balanced, Classic 'S' shape, universal head shell
Effective Arm Length: 230mm
Overhang: 15mm
Height of tone arm adjustment range: 0-6 mm
Tracking Error: > 3 degrees
Applicable cartridge weight Without head shell: 3.5- 8.5 g
Anti-skating range: 0-3 g
Signal-to-Noise Ratio: >55 dB DIN-B
Output Level Pre-amp "PHONO": 2.5 mV nominal at 1 kHz, 5 cm/sec
Pre-amp "LINE": 150 mV nominal at 1 kHz, 5 cm/sec
Phono Pre-Amp Gain: 36 dB nominal, RIAA equalized
RIAA 20-20kHz, +1/-3dB (In: 1.5mV 1kHz)
 USB Function: A/D, D/A- 16 bit 44.1 kHz or 48 kHz USB selectable
Computer interface: USB function
A/D, D/A 16 bit 44.1 kHz or 48 kHz USB selectable
Computer interface USB 1.1 Compliant Windows XP or
above or MAC OSX or above
Power Supply Requirements: 115V AC, 60 Hz

Includes :

Software included: Mac- and PC-compatible Audacity software
Accessories Included: 'Universal' Head shell, Slip mat: dust cover: platter: 45 RPM adapter: counterweight: head shell: power cord: USB cable: dual RCA (female) to 1/8" (3.5 mm) mini-plug (male) stereo adapter cable: dual RCA (female) to 1/8" (3.5 mm) mini-plug (female) stereo adapter cable: dual RCA (male) cable with integrated ground wire: stylus target light: Audacity software (CD)
*System requirements (if you're planning on using the table to transfer and burn your LP's / albums, records to CD ROM or your computer hard drive or some other MP3 format):
PC or Mac with an available USB port (USB1.1 or higher), CD-R or CD-RW writer for burning CDs & installation.
Includes Audacity software for PC & Mac users
(Audacity requires Mac running OS X 10.1 or later or PC running Windows (98 and above))
(Refer to included software guide (also available online at www.audio-technica.com) before connecting the turntable to your computer.)
Comes with the Audio-Technicas' 1 Year limited warranty handled through the AT. See Audio-Technica AT-LP1240USB turntable owners manual or AT's web site for further details.
Dimensions w 17.72" x d 13.9" x 6.6" H and weighs a HEAVY 28 lbs.
AUDIO-TECHNICA AT-LP1240USB TURNTABLE
Cond.- NEW

$529.99
and when purchased from Oak Tree Vintage also includes *AT-95E CARTRIDGE!

*Turntable shipped directly from AT and the Cartridge will be shipped from us at Oak Tree Enterprises, LLC. Once products arrive, please call us for assistance with re-balancing tone arm and setting the 'Anti-Skate' adjustment.

* Denotes change / addition from previous model
 

    


   

     

NEW ADDITION 8/27/19
(Click on above thumbnails to enlarge photos)
warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE STEREO RECEIVER
SANSUI 2000X STEREO RECEIVER
140 WATT RATED DYNAMIC POWER
 #...0852
Circa '73-76
"WORLD AC POWER" ™
MIJ
SOLD 9/11/19
SHIPPING TO LYN IN CALIFORNIA

ü Our technician has completely gone through and 'Certified' this unit.

ü Everything was cleaned inside and out including all contacts, switches, controls and I/O jacks.

ü Control Pot shafts re-sprung.

ü Internal and external fuses checked and replaced where necessary.

ü All 4 power transistors removed and tested for leakage.

ü Re-flowed multiple solder joints

ü We also aligned the tuner front end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years.

ü We re- aligned the tuner dial indicator for improved accuracy

ü All meter, dial, and FM stereo lamps replaced for trouble-free service (very difficult to do on this series of receiver). 6x #40 & 4x #25-130 bulbs / lamps.

ü Tuner string re-tensioned for improved flywheel 'grip'

ü Amplifier section had output bias and DC offset adjusted to spec levels

ü Repaired 'open' coil on tuning meter

ü Entire unit cleaned / detailed cosmetically inside and out, including a fresh coat of lemon oil rubbed into the Real Walnut wood veneer cabinet, while chassis was removed.

ü All inputs have been tested and both side produces clean and even sine waves into static 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.

ü Following our restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours and into a 4 Ohm Load! You will not be disappointed. Total restoration / ‘tech time’ investment ~13 hours.

ü On our test bench, both this unit's amplifiers, #...1204 produced peak power of 18 Volts per channel @ 8 Ohms for 40 Watts and 15 Volts @ 4 Ohms for 56 Watts per channel via discrete, TO-3, metal cased outputs with 1 kHz input. (4x Toshiba 2SC793, (same as Sanken 2SC1111)).
ü Idle current draw measured at 0.2A. Bias adjusted to spec of 20mA. (which by the way, once biased, brought the idle temperature of the heat-sink down from ~220F degrees to ~68°F)
ü DC offset adjusted to <15mVDC L & R unloaded and ZERO mV loaded (from the 75mVDC exhibited initially).
ü Floor noise measured at -60dBm AC w/ AUX shunted).
  ____________________________
  
This receiver is from what many consider to be one of Sansui's best eras. The Sansui 2000X stereo receiver. The "X" suffix designates upgraded F-6013 driver boards that are sought after by owners of "non-X" units as an aftermarket upgrade. We have had a few 'X000' series Sansui units and they are among some of the best sounding, 'vintage', 'main stream' amplifiers we have heard. Lots of headroom and punch! Similar in sound to many of the NAD amplifiers / receivers we sold back in the 80's. This one also is installed in the optional, REAL walnut wood veneer case that's in beautiful condition as well.

Sansui 2000X Features include:

§  Weighted flywheel, 'slide rule' style analog tuning
§  Dual Tuning Capacitors. One for FM and one for AM. Allows for incredibly 'quiet' tuning
§  Speaker Damping Selector
§  A, B, A+B, Off, speaker positions
§  Separate Left and Right, Bass and Treble w/ 'concentric' controls
§  Hi-Filter for reducing tape hiss / electronic hiss & noise and record static
§  Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables
§  Pre-Amp Out / Power-Amp In Loop (unique to the "X" version)
§  'TRUE' tape monitor featuring both RCA and DIN I/O's (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-Gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
§  Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-Gadget / MP3 / XM® / SIRUS®  etc.)
§  Tape B to Tape A Dubbing capability
§  Dual Phono / Turntable inputs with Built-In Phono Pre-Amps
§  "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
§  Stereo / Mono selector for Pre-Amp separate from the FM tuner selector
§  Pre-Amp Stereo / Mono selector
§  Stereo Reverse selector (great for troubleshooting speakers)
§  FM Muting separate from the Stereo / Mono selector
§  FM MPX filter (removes the 19kHz pilot signal from FM broadcasts)
§  Rear located MPX Separation & Level adjustments
§  FM Dist / Loc selector
§  Front mounted 1/4" stereo headphone jack
§  Tuning window features VU meter for tuning signal strength
§  Rear located speaker and main power protection fuses
§  Vertically finned heat sinks for very efficient cooling and long life
§  Built-In Ferrite 'Stick' AM antenna
§  True "WORLD AC POWER"™ allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input.
§  Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched

Sansui 2000X SPECIFICATIONS:

POWER / PRE AMP SPECIFICATIONS:
Music Power: 140 Watts dynamic @ 4 Ohms
100 Watts dynamic @ 8 Ohms
Cont rated RMS Power: 2 x 52 Watts @ 4 Ohms, 20-20k & <0.8% THD
THD; 0.8% @ full rated power
IMD; 0.8% @ full rated power
Power Bandwidth (IHF); 20Hz-40kHz
Damping factor; 24 @ 8Ω & full bandwidth
Hum and Noise;  70dB on Phono w/ 2.5mV input and 80dB w/ 5.0mV input
Input Sensitivity AUX / Tape; 150mV @ 100kΩ
Bass Control;  ±12dB @ 50hz
Treble Control;  ±12dB @ 10khz
High Filter;  -10dB @ 10kHz
Low Filter;  -10dB @ 50Hz
"Loudness" Contour;  +8dB @ 50hz & +3dB @ 10kHz (volume control @ -30dB)

TUNER SPECS FOR FM:
Tuning Range; 88-108mHz
Freq Response; 30-15kHz
Capture Ratio; 1.0dB
S/N; > 60db Stereo
20dB Quieting Sensitivity Mono; 1.4μV
FM Alternate Channel Selectivity; > 40dB
Spurious Radiation; <34dB
Spurious Response Rejection; >90dB
Image Rejection Ratio; >90dB
THD 65dBf @ 1kHz, Mono;  <0.8%
Stereo Separation Ratio: >35dB @ 50Hz to 10kHz

TUNER SPECS FOR AM:
Tuning Range; 535-1605kHz
Image Frequency Rejection; >50dB @ 1kHz
IF Rejection; >80dB @ 1kHz
Useable Sensitivity; 100μV / m @ 1kHz with ferrite stick antenna
Selectivity; >20dB @ 1kHz

PHONO SECTION SPECS:
Freq Response; 20-20kHz
THD; 0.8% @ 200 mV @ 1kHz
Input Sensitivity; 2.5 mV @ 50kΩ on 'Phono-1' & 2.5 mV @ 100kΩ on 'Phono-2'
Max input; ~200 mV @ 50kΩ

Again, we have completely gone through this unit. This is the first Sansui 2000X we have refurbished in a few years. Brushed aluminum face and knobs in like NEW condition. Unit looks and sounds great! Originally 'Optional', but now included, Real Walnut wood, veneer case in decent condition, also in NEAR NEW condition with only the most minor of visible wear.
Again, these are known for their exceptional tuner quality on both AM and FM and their VERY PUNCHY sounding amplifiers. Very 'Musical' sounding stereo receiver. Measures 18" wide x 14" deep x 6.5" deep and weighs a whopping 34 lbs unpacked. Comes with standard 90 day limited warranty.
SANSUI 2000X STEREO RECEIVER
Cond. 8.5++
SOLD 9/11/19
SHIPPING TO LYN IN CALIFORNIA
(Cons. M.H.)

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

 

    

   

      NEW LISTING 5/21/18
(click on above thumbnails to enlarge photos) 
warranty
 CLASSIC STEREO SPEAKERS
 JBL L100 'CENTURY'
#...1011A / 9060A
  Circa mid 1971-77
 MADE IN USA
SOLD 5/23/19
SHIPPING TO STEPHEN IN COLORADO

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


  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

    

        NEW LISTING 11/2018
 (click on above thumbnails to enlarge photos) 
warranty
VINTAGE KENWOOD SPEAKERS
KENWOOD KL-777X
15" WOOFER / 3-WAY / 4-DRIVER
200 WATTS
WITH TWEETER / MID PROTECTION ADDED
#...0829/0904
Circa 1979-81
Made in Japan
SOLD 12/20/19
SHIPPING TO DAN IN CALIFORNIA
Classic lattice grill, vintage & large Kenwood KL-777X stereo speakers. 3-Way, 4-Driver, Bass Reflex cabinet design. These are VERY efficient speakers with above average tone balance for late '70's speakers. Plenty of top end that can be filtered / tailored to your tastes with built-in attenuator or external EQ / tone control. Also HUGE & tight low end, likely due to the ported and very 'tuned' cabinet design. They also seem to be able to handle "power" better than your average speaker. Not simply referring to they're wattage rating, but just the way the perform at higher power / volume levels without "falling apart" sonically.

Our speaker tech has completely gone through and 'Certified' these.

- All drivers were removed and tested individually.

- Attenuators / L-pads cleaned for 'intermittent free' performance.

- Poly-Spun batting added to existing damping material to 'tighten up bass response' and reduce cabinet 'ring'.

- We were originally prepping these speakers for a commercial application (Micro-Brewery) so for more 'trouble-free' durability, we added #1156 bulbs as 'shock absorbers' to the tweeters and midranges (as we commonly do for 'commercial applications' or where there's a chance a speaker may be subjected to more stringent duty cycles). (This particular chain of 'mid-western' micro-brews have purchased dozens of pairs of speaker from us over the past 5 years, actually consuming most of the 'lattice grill' units that have come in to us. These were a in a batch that we did for their last location, that were not needed in the end, as that install had more than enough)

- Gasket / sealant material was added to all driver mounting flanges, prior to re-installation to reduce any possibilities of vibration or acoustic anomalies.

Cosmetically, cabinets were cleaned & the wood grain, vinyl wrapped cabinets are in decent shape with typical nicks and scuffs. One of the Poly molded grills has some 'chunks / chips' out of one corner, but other than than, both are in good 'structural' shape (see photos above). Felt feet were installed to the cabinet bottom plates.
Next, as always, they were tested with both recorded material, PN 20-20k and swept them with our AF generator from 1Hz-3kHz.
Then came our standard, 'issue exposing' and on some levels, 'abusive' test recordings. These speakers are ready to go!

We auditioned this pair extensively and 'THEY DELIVERED' as expected, but additionally adding the 'gasketing' really 'tightened' up the cabinets and cleaned up the bass response. The 'bass' is not only solid and tight on these speakers, but goes VERY DEEP.

Our demo cuts included the following; Dire Straits' "So Far Away" from their album 'Brothers in Arms' album,
Donald Fagens, "I.G.Y." from the album "Night Fly" (solid / snappy reproduction), '24K Gold Edition of Jennifer Waren's "Famous Blue Raincoat' (the saxophone was a bit bright, but not offensive, smooth),
TLC's "Scrub" from their album 'Fan Mail' (did 'sub-bass' note @ 1'25" & 1'35" decently,
Allison Kraus and Union Station's "Baby, Now That I've Found You" (upfront and natural),
Cowboy Junkies ‘Sweet Jane’ (VERY open’),
Don Williams' DDD version of 'Country Boy' (good, 3-D soundstage),
Calvin Hampton's, "The Wedding March" from "Digital Pipes, The Splendor of the Organ", a digital recording of a cathedral pipe organ (open and HUGE!),
Trapt’s “Headstrong” (was ‘solid’ and the woofers exhibited no sign of fatigue even at upper power levels)
Just about anything from "KORN" ROCKED!!!
Most of the cuts from Michael Jacksons' 'Number Ones' such as "Bad" "Beat It", and "Billy Jean", were ‘strongly’ reproduced and VERY solid,
Van Halens' cut "Drop Dead Legs" from the CD "1984" ROCKED!

Nickel Creeks’ “When in Rome” from their CD "Why Must the Fire Die?" (was a BIG, open and up-front),
and a few others, all digitally recorded and some 'DDD'.
 Incredible power handling characteristics for a speaker this size. They are able to handle "power" better MUCH than your average speaker. Not simply referring to their wattage rating, but just the way they perform at higher power / volume levels without "falling apart" sonically. We 'stood' on them HARD with our test Hafler 500 Watt power amplifier. 'Solid', punchy and 'tight' low-end, with no 'mush'.

We auditioned this pair extensively and 'THEY DELIVERED' as expected, but additionally adding the 'gasketing' really 'tightened' up the cabinets and cleaned up the bass response.

Great sounding speaker for that classic 70's stereo receiver or amplifier!
 We have completely tested them with both recorded material, PN and swept them with our AF generator.

Kenwood KL-777X Features: 

- 15" Non-deteriorating Cloth surround Woofer
- 6.25" x 2" Exponential-Horn / Upper Midrange
- 2x 2.5" Tweeters
- "Real" internal cross-over, not just a couple of "caps" on the mids and tweets
- 3-position Hi frequency attenuators, using resistors, not failure prone Ni-Chrome wire, for custom tailoring sound to your tastes and listening room
- Dual 2" Tuned ports for extended low end

Kenwood KL-777X Specifications:

Enclosure Type: Bass Reflex / Tuned-Ported
Frequency Response: ~20-21,000Hz +- 3dB
Efficiency: ~96dB 1w @ 1m
Nominal Impedance: 8Ω
Cross-over frequencies: 2kHz and 8kHz
Recommended Nominal Power Amplifier range: 10-250 Watts
Recommended Power Rating: 100 Watts
Recommended MAX Power rating: 200 Watts

Very nice looking wood grain, vinyl wrap cabinets with only a few, minor 'battle scars'. Again, as stated above, both Poly molded grills in fair shape as one has the 'chips / chunk' from the top corner (see photos above).
All drivers are in perfect condition, work and sound fine! Tested for all frequencies with a sweep generator.
Speakers look fine (except for the above mentioned grill issue) and sound GREAT! Huge, accurate and loud sound, but also very efficient at lower powers due to their 96dB rating! If you're looking for a great performing speaker at medium to higher volume applications, you will not be disappointed with these speakers. Each measures 25.75" H X 23" W X 10.5" D and weighs 37 lbs unpacked. Includes our standard 90 day limited speaker warranty (& excluding problems due to under / over powering)
KENWOOD KL 777X
Cond. 8 (due to scuffs / grill chip)
with grills
SOLD 12/20/19
SHIPPING TO DAN IN CALIFORNIA
(Cons.) C.B.S.

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

      

      NEW LISTING 11/2018
(click on above thumbnails to enlarge photos) 
  warranty
VINTAGE
RECTILINEAR III "TALL BOYS"
STEREO SPEAKERS
#...7942 / 7982
Circa 1968-73
MADE IN THE USA!
SOLD 5/5/19
SHIPPING TO FRANK IN CONNECTICUT
Our speaker tech has completely gone through and 'Certified' these.  We have completely tested all drivers. Original mids' were 'questionable' on the 'audio sweep' so the Midrange's were replaced with a pair of 'originals' we had 'rat-holed' here at Oak Tree Vintage. All drivers were removed and reinstalled into cabinet with ‘added’ gasketing material under their frames to further reduce any possibilities of vibration or acoustic anomalies. Both Mid and Top End attenuators had their contacts burnished and were cleaned internally. Next, as always they were tested with both recorded material, PN 20-20k and swept them with our AF generator from 20-10kHz. Then came our standard, 'abusive' test recordings. We also converted the grills from a 'nailed on' attachment to Velcro and added 'pull-tabs' to facilitate removal (commonly if someone has tried to remove the grills from Rectilinear 'Hi-Boys', the masonite frames will be broken / cracked from being pulled away from the baffle board nails. These were expertly removed, thus are completely intact and un-broken). These speakers are ready to go!

Rectilinear 'III Tall Boys' features include:

- 4-way, 6-Driver, Bass Reflex speaker design
-12" Low Frequency Driver (woofer) (Jensen)
- 5" 'Philips" Midrange w/ 'whizzer cone' & w/ AlNiCo magnets
- 2x 2.5" 'Danish made Peerless' Tweeters w/ AlNiCo magnets
- 2x 2" 'Danish made Peerless' Tweeters w/ AlNiCo magnets
- 2" Tuned port for extended bass response
- Dual Attenuators

Rectilinear 'III Tall Boys' Original Specifications:

Frequency Response: 22-18,500Hz +- 3dB
Nominal Impedance: 8Ω
Cross-over frequencies: @ 500Hz, 3kHz & 11kHz
Recommended Power amplifier rating: 20-100 watts

From a 1967 Stereo Review Julian Hirsh had this to say about the Rectilinear III, "Over a period of several months, we have had the opportunity to compare it with a number of other speakers that can 'outpoint' the Rectilinear III on any "individual" characteristic-frequency range, smoothness, distortion, efficiency, dispersion or transient response. However, none of the speakers combine ALL of these properties in such desirable proportions as the Rectilinear III", and  in a 1972 Stereo Review, he had this to say about the Rectilinear III, "...the two samples we have tested are among the best-sounding and most 'natural' speakers we have heard"
This pair actually has 'Jensen' built 12" woofers from the factory (my personal Rectilinear III-High-Boys do not. Just FYI.) These are great sounding 12" 4-way speakers. All drivers feature a non-deteriorating cloth surrounds. The driver compliment consists of one heavy duty 12" woofer, one 4" midrange with hi-mid whizzer cone, two 2.5" cone tweeters and 2 1/5" cone super tweeters. Bass is enhanced via a 3" tuned port.
System input is via binding-post / banana jacks. The input plate also features midrange and hi-freq attenuators, and the "MADE IN THE USA" plate. The entire enclosure is damped with batting. The cabinets are a beautiful American Walnut with very nice grain featured throughout and are in near new condition. These have great efficiency, but are still able to handle bigger power. Huge bass and crystal clear highs with just enough mids.

These things ROCK! I know. These are the pair from my personal 'speaker stash / collection'.

They measure 35" tall x 18" wide x 12" deep and each weighs 70 lbs unpacked. Comes with an 'e-copy' /pdf download of the Rectilinear Owners manual, as well as a few 'e-copies' of original brochures. Includes our 90 day warranty (excluding problems due to under / over powering)!
RECTILINEAR III
Cond. 8+
with grills
SOLD 5/5/19
SHIPPING TO FRANK IN CONNECTICUT

(Due to the dimensions and / or weight of these speakers, Packing / SHIPPED will be somewhat more 'involved' than typical. Custom, double-wall boxes will be manufactured specifically for them. While we order custom built boxes often, this can sometimes delay SHIPPED by 5-10 days)

 (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

  

 

    

NEW LISTING 11/9/18
(click on above thumbnails to enlarge photos) 
warranty
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE TECHNICS SPEAKERS
MCS / TECHNICS 8320
#...A506 / A545
Circa Late 1970's early 1980's
MIJ
SOLD 11/12/18
SHIPPING TO WILLIAM IN MARYLAND
These are from an upper-end line of speakers that Technics produced for MCS. The "Linear Motion" line used a Tri-Planer baffle board design to more correctly "time align" the 'top end' drivers with the woofer. The Midrange is on a 'spacer' to position it (time-wise) between the tweeter and woofer. This design was based on the Flagship (and very expensive) Technics SB-7070 speakers.
Our speaker tech has completely gone through and 'Certified' these. We have completely tested them with both recorded material, PN 20-20k and swept them with our AF generator.  
MCS 8320 Features include:

- 3-Way, Bass Reflex cabinet
- 'Time-Aligned' / Bi-planar baffle board
- 2" Pulp-cone tweeter
- 4" Pulp-cone Midrange
- 12" Ribbed, Pulp-Woofer with non-deteriorating Cloth surround
- 2.25" tuned port for extending low end
- External, resettable protection relays for all drivers
- 'Spring Clip' Speaker terminals

MCS 8320 Specifications / Specs:

Frequency Response: 32-22,000Hz +- 3dB
Efficiency: ~92dB 1W@ 1m
Nominal Impedance: 8Ω nominal
Recommended Minimum Power amplifier rating: 15 Watts minimum

Again, all drivers tested, work and sound fine! Tested for all frequencies with a sweep generator. Speakers cleaned inside and out. They have black cloth grills and the cabinets are a mixture of black and walnut grain vinyl wrapped. Cabinets and grills are in great shape. Grills still have all locating pins intact and frames are free of breaks / cracks etc. Each cabinet measures 24" tall x 13.5" wide x 12.25" deep and weighs 26 lbs unpacked. Includes our standard 90 day limited warranty ( & excluding problems due to under / over powering)
Technics
MCS 8320 Stereo Speakers
Condition 8.5++
with grills
(Cons.) R.R.
SOLD 11/12/18
SHIPPING TO WILLIAM IN MARYLAND

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)


 

    

NEW LISTING 11/2018
 (click on above thumbnails to enlarge photos) 
warranty
 PRE-APPRECIATED
YAMAHA STEREO SPEAKERS / MONITORS
YAMAHA NS-A738 / NSA738 BIRCH FINISH
 #...4631 / 4632 (consecutive numbers)
Circa 1999-2000
Made in the USA (yes, really)
SOLD 12/26/18
SHIPPING TO JIM IN LOUISIANA
Great looking, performing and sounding Yamaha NS-A738 3-way speakers have a room filling, "tight" sound that ensures sonic accuracy. Great for home use or project studio monitors. If you can't afford the famous Yamaha NS-10's (now, currently north of $1000.00), then these may be an affordable alternative for your project recording studio (I used to be a dealer for NS-10's and have heard and sold many).


Our speaker tech has completely gone through and 'Certified' these.
We have completely tested them with both recorded material, PN 20-20k and swept them with our AF generator. Prior to testing with the sweep generator, we added gasket material under all the driver flanges in each cabinet to eliminate resonate vibrations. This is really a 'finishing touch' on this model of Yamaha's that should have been done at the factory, but is rarely done by most companies / manufacturers. We also added 'poly-spun' batting to the cabinet space to further tighten up the low-end, eliminate hollowness / cabinet ringing. Again, should have been done at the factory, instead of relying an 'empty cab' to allow 'boomy bass' which on the original sales floor, made the box appear sonically 'larger' than it is by making the box seem to be producing more bass. The 'bass' that an un-damped cabinet produces is 'hollow and flappy', and not what you'll want to listen to over the long haul. That would be come very fatiguing soon.
Handles power decently and reproduced the low-end in our most difficult test CD! If you've read some of our other 'audition notes', you'll know what is meant when I say that these speakers, "reproduced the "TLC 'Sub-Bass' note' VERY well" when situated on the floor.

 Yamaha NS-A738 Features include:
   
- 3-Way, Acoustic Suspension design for studio monitoring "tight bass"
- 8” High-Compliance, Cloth Surround, Polypropylene Coated, Long-Throw woofer, woofer w/ non-deteriorating cloth surround
- 4” mid non-deteriorating paper surround
- .75” Ferro-Fluid Cooled, Mylar, Dome tweeter
- Infinite baffle for exceptionally tight bass
  
Yamaha NS-A738 Specifications:
  
Frequency Response: 90-20,000Hz ± 3.5dB  
Efficiency: 91dB 1W @ 1m
Nominal Impedance: 8Ω each
Cross-over frequencies: at 4.2kHz & 13.5kHz (6dB / Octave)
Recommended Minimum Amp Size: 10 Watts
Maximum input power rating: 140 Watts
  
All drivers work and sound fine! Tested for all frequencies with a sweep generator and test CD's. Each finished in black, matte, vinyl wrap. Speakers look and sound GREAT! One of the best "all around" speakers we've heard in a long time at any size or price. Each measures 16" tall x 11" wide x 13" deep and weighs 14 lbs unpacked. Includes our standard 90 day limited warranty ( & excluding problems due to under / over powering)
YAMAHA NS-A738 STEREO SPEAKERS
Cond. 8.5+
SOLD 12/26/18
SHIPPING TO JIM IN LOUISIANA

   (Above text property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)
 

    

         NEW LISTING 11/2018
 (click on above thumbnails to enlarge photos) 
warranty
 PRE-APPRECIATED
YAMAHA STEREO SPEAKERS / MONITORS
YAMAHA NS-A738 / NSA738 BIRCH FINISH
#...2166 / 2167 (consecutive numbers)
Circa 1999-2000
Made in the USA (yes, really)
SOLD 2/20/19
SHIPPING TO TED IN ARKANSAS
Great looking, performing and sounding Yamaha NS-A738 3-way speakers have a room filling, "tight" sound that ensures sonic accuracy. Great for home use or project studio monitors. If you can't afford the famous Yamaha NS-10's (now, currently north of $1000.00), then these may be an affordable alternative for your project recording studio (I used to be a dealer for NS-10's and have heard and sold many).


Our speaker tech has completely gone through and 'Certified' these.
We have completely tested them with both recorded material, PN 20-20k and swept them with our AF generator. Prior to testing with the sweep generator, we added gasket material under all the driver flanges in each cabinet to eliminate resonate vibrations. This is really a 'finishing touch' on this model of Yamaha's that should have been done at the factory, but is rarely done by most companies / manufacturers. We also added 'poly-spun' batting to the cabinet space to further tighten up the low-end, eliminate hollowness / cabinet ringing. Again, should have been done at the factory, instead of relying an 'empty cab' to allow 'boomy bass' which on the original sales floor, made the box appear sonically 'larger' than it is by making the box seem to be producing more bass. The 'bass' that an un-damped cabinet produces is 'hollow and flappy', and not what you'll want to listen to over the long haul. That would be come very fatiguing soon.
Handles power decently and reproduced the low-end in our most difficult test CD! If you've read some of our other 'audition notes', you'll know what is meant when I say that these speakers, "reproduced the "TLC 'Sub-Bass' note' VERY well" when situated on the floor.

 Yamaha NS-A738 Features include:
   
- 3-Way, Acoustic Suspension design for studio monitoring "tight bass"
- 8” High-Compliance, Cloth Surround, Polypropylene Coated, Long-Throw woofer, woofer w/ non-deteriorating cloth surround
- 4” mid non-deteriorating paper surround
- .75” Ferro-Fluid Cooled, Mylar, Dome tweeter
- Infinite baffle for exceptionally tight bass
  
Yamaha NS-A738 Specifications:
  
Frequency Response: 90-20,000Hz ± 3.5dB  
Efficiency: 91dB 1W @ 1m
Nominal Impedance: 8Ω each
Cross-over frequencies: at 4.2kHz & 13.5kHz (6dB / Octave)
Recommended Minimum Amp Size: 10 Watts
Maximum input power rating: 140 Watts
  
All drivers work and sound fine! Tested for all frequencies with a sweep generator and test CD's. Each finished in black, matte, vinyl wrap. Speakers look and sound GREAT! One of the best "all around" speakers we've heard in a long time at any size or price. Each measures 16" tall x 11" wide x 13" deep and weighs 14 lbs unpacked. Includes our standard 90 day limited warranty ( & excluding problems due to under / over powering)
YAMAHA NS-A738 STEREO SPEAKERS
Cond. 8.5+
SOLD 2/20/19
SHIPPING TO TED IN ARKANSAS

  (Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

    

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

ü We have completely gone through this unit, cleaning inside and out including all contacts, switches and controls.



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

The same 'fix' can be utilized on the 'Headphone' level pot, then simply use the main volume of the pre-amp to control the headphone level (like EVERY other unit does).

ü Unit All RCA I/O jack terminal solder joints re-flowed internally





ü *Unit also has an issue with the *'Hi-Filter' switch. While it has been cleaned and lubed, it will not 'lock in' so consider there's no 'Hi-Filter' on this one (yes, the circuitry still functions, but was not practical for use to source a replacement switch on this unit with the other two issues. "Hi-Filter" is also a fairly 'fringe' feature and seldom used by most folks, so we decided it was 'excusable')

ü *Unit also has the issue, common with the "Balance" control potentiometer affecting the headphone amplifier, with additional issue with the 'headphone' section, thus we have bypassed the entire headphone functions on this one.

ü All inputs tested and both side produces clean and even sine waves! Checked with O-Scope.

ü  No power supply hum of any kind. It's dead silent! 
  ____________________________
  
Versatile Kenwood "Basic C2" Pre-amp / control center. Would match up well with any power amp and is very "utilitarian". Loaded with "real world" features. Again, with the exception of the 'bypassed balance control', the unit works well and sounds great! Cosmetically the only issue really worth mentioning is that the top, metal cover has scratches from someone sitting a unit with no feet on it and moving it around. Also, as the 'Balance' and 'Headphone Level' are 'non-functional', we inserted hole plugs where the knobs would be (the pots are still there if anyone wants to attempt a repair in the future.)

Kenwood C2 Features include:
  
- Separate Bass and Treble with selectable turnover frequency
- Turnover freqs set at 200 or 400 on the bottom end and 3k or 6kHz on the top end.
- Selector for MM or MC cartridges
- 5 position phono cartridge EQ selector (this feature, combined with the MM/MC selector / head-amp alone can be worth a few hundred dollars, if you're contemplating moving up to a Moving Coil turntable cartridge. MC carts require an extra head-amp and this amplifier has one built in)
- Built-in Low and Subsonic Filters to eliminate excess rumble from sources such as turntables. These are selectable for either 58Hz, 40Hz or 18Hz @ 18dB / Oct.
- Hi "Scratch" filter set at 8Khz with a slope of 12dB / Oct. Useful for reducing the 19kHz pilot tone in FM and tape hiss / electronic hiss & noise and record static (again, NON-functional on this particular unit, #...0258)
- Output defeat
- Mono / Stereo input selector
- Phono / Turntable input with Built-In Phono Pre-Amp
- Dual Tape Monitors with bi-directional dubbing (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc. as well as for CDR)
- Dual (1 & 2) Aux inputs (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- CD Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Headphone output with separate level control (again, NON-functional on this particular unit, #...0258)
- Indicator LED's for input selector
- 3 AC convenience outlets ( 2 switched 1 un-switched)
  
Kenwood C2 Original Specs:
   
Design type: 2 Channels, Analog operation
Frequency Response: 1-350kHz +0 / -3dB
Maximum Output Level: 1V
THD: 0.001% at full rated power
Phono MM Sensitivity: 2.5mV for 5.0V output @ 1kHz
Phono MM Maximum Input Level: 200mV
Phono MC Input Impedance: Selectable
S/N on Phono MM w/ 5mv signal: 94dB
Phono Capacitance: Selectable
High Level Sensitivity (tuner, Aux, Tape): 150mV
  
The Kenwood C2 has always been one of our favorite pre-amps under $600-$800. It's simply hard to beat for specs, features and performance. That is also evidenced by the fact that it was current in Kenwood's lineup, as their upper end pre, for almost half a decade. Again, we have completely gone through the unit cleaning all contacts, pots, switches and controls. All functions (again, with the exception of the 'Balance' control') test as original. Unit looks and sounds great! Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs unpacked. Comes with original owners manual and includes our 90 day limited warranty.
KENWOOD BASIC C2
Condition 7 (due to balance control, headphone amp and Hi-Filter issues)
SOLD 1/30/20
SHIPPING TO STEVE IN OHIO

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

 

    

          NEW ADDITION 1/22/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
PRE-APPRECIATED KENWOOD POWER AMPLIFIER
KENWOOD KM-106 / KM106 POWER AMP (same as KM-105 with different graphics)
'Military Market' / PX UNIT
500 WATT MONSTER!!!
#...1149
Circa 1985-86
MIJ
SOLD 1/30/20
SHIPPING TO STEVE IN OHIO

ü  Our technician has completely gone through and 'Certified' this unit.

ü  Unit bench checked / tested.

ü  Amp has been cleaned inside and out.

ü  Face removed, meter illumination lens removed, cleaned and reattached.

ü  All new panel illumination lamps replaced with new.

ü  All functions have been tested and pass with flying colors!

Amp designed using Huge Power Supply Transformer and oversized, vertical finned heat sink for very efficient and silent, passive cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 48 hours straight and it functioned flawlessly.
   
While this amp is originally rated at 125 Watts with both channels driven (250W + 250W "Peak Music Power"), on our test bench, this particular unit's (#...1149) amplifiers produced 38 Volts at 8 Ohms per channel for 180 Watts / channel and 33 Volts at 4 Ohms per channel for 272 Watts / channel via discrete output transistors (2x Sanken 2SA1215 & 2x 2SC2921. (Idle AC current draw @ .4A.
Floor noise measured at L= 00.0mVAC and R=00.0mVAC / -60dBm) 
   
Great, later model power amp by Kenwood. Model KM-106. HUGE power output! Excellent for 2-channel (stereo) audio listening or for use in an A/V system. Lots of punch and headroom.

Kenwood KM-106 Features:
   
- Old Skoool Class A/B amplifier design (NO Digital here!)
- 2- Channel stereo operation
- A or B speaker selector via high current relay
- Dual, Vertical, 7-Segment LED Power Output Meters with Dual Position Level Selector
- Built-in Protection circuit
- LED Status indicators
- Front-mounted 1/4" stereo headphone jack
- RCA input jacks
- Dual, vertical finned internal heat sink
- Oversize power supply transformer
- 3 Rear-mounted AC convenience outlets (2 switched and 1 un-switched for a total capacity of 200 Watts)
   
Kenwood KM-106 Original Specs:

 "125 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.03% THD"
Design type: 2 Channels, AB operation
Damping Factor: >35 @ 50Hz / 8 ohms
Signal / Noise: 120dB A weighted
Rated RMS Output: 125 Watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz.
Music Power 250 Watts + 250 Watts
THD:
0.03% at 'Full Rated Output'  / 8Ω w/ 20-20kHz
0.015% @ half rated power / 8Ω w/ 20-20kHz
0.002% @ half rated power / 8Ω w/ 1kHz
IMD: 0.002% @ rated power / 8Ω
Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
Potential Frequency Response: 5Hz-200kHz
 
Again, as stated before, our technician has completely refurb'd this Kenwood KM-106, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps over the past 2+ decades, with never a complaint. Includes an 'e-copy' pdf download of the Kenwood KM-106 owners / users / instruction manual. Unit looks, works and sounds great! Unit measures 16.5" wide x 10.5" deep x 4.75" high and weighs 18 lbs unpacked. Includes our standard 90 day limited warranty.
KENWOOD KM-106
Cond. 8.5++
SOLD 1/30/20
SHIPPING TO STEVE IN OHIO

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)

 

         



          NEW LISTING 1/8/19
(Click on above thumbnails to enlarge photos)
warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
VINTAGE MITSUBISHI POWER AMPLIFIER
MITSUBISHI DA-A10DC STEREO POWER AMP
WITH ORIGINALLY OPTIONAL MITSUBISHI DA-M10 METER BRIDGE
TRUE DUAL POWER SUPPLIES
 ONE OWNER!
MIJ
SOLD 12/20/19
SHIPPED TO RICK IN INDIANA

DC-C20, DA-M10 & DA-A10DC
(see listing to the left for details on the 'Pre-amp / Tuner')

ü Our technician has completely gone through and 'Certified' this unit.

ü Much of amplifier disassembled, the everything cleaned inside and out including all switches, controls and contacts. Cleaned and re-lubed all control shafts.



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



ü Solder joints reflowed on all possible high heat and stress points

ü Amplifier section had output bias and DC offset adjusted to spec levels after 10 min warm-up.



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



ü Analog, VU / D'Arsonval Meters adjusted 'mechanically' for 'Zero' position, and electronically to match amp output.

ü All functions tested for perfect operation.

ü Following above procedures, unit was cosmetically detailed inside and out.

ü All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent!

ü Following service / refurb procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours.
Total restoration time investment 10.5+ hours. You will not be disappointed.

On our test bench, each internal amplifier of this particular unit, #...0128, produced peak power of 31.5 Volts per channel at 8 ohms for 124 Watts per channel and 27Volts at 4 ohms for 182 Watts per channel via discrete output transistors (2X Sanken 2SA908 & 2SC1585).
AC Idle current at 450mA. Floor noise > -60dBm.
 ____________________________


Performs and sounds fantastic! All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop for 48 hours and it functioned flawlessly (we actually took it into our 'demo' system and 'rocked-it' HARD on our Altec VOTT's. HUGE sound and thump).

This is a Huge and Beautiful looking, performing and sounding power amplifier. Great 'High-Tech' look (in 'vintage terms anyway). Cosmetically, it looks great with only a few minor 'dings / scratches', mostly not visible from the front. The minor scratches on the front are faint and fairly 'un-noticeable' (see photos above).
While it could be used with any other pre / control amp, as they came in as a pair from the original owner, we only want them to stay together to their 'new' owner.

Mitsubishi DA-A10DC / DA-M10 Features:

- True DUAL power supplies (has a lot to do with how much this amp 'punches'. (See photos above of power supply)
- Huge, Externally located, 'vertically finned' heat-sinks
- DC protection for 'Turn-On Surge' and 'Output'
- A and / or B speaker selector
- Front mounted 'Gain / Level' controls via the Meter option on the front. Power amp has input levels on the rear panel as well (slotted heads for screw-driver)
- Huge, Beautiful, Lit VU Power Output meters
- Meter Range selector for either normal or 'x 0.1'
- 'Thermal Indicators' located on heat-sinks (think "mood ring" technology)
- Signal inputs via standard RCA jacks
- Three-pin jack for 'Mitsubishi' connector cord to Mitsubishi Pre-amp speaker switch controller

Mitsubishi DA-A10DC Specifications:

Rated RMS Output: 100 Continuous Watts per channel, min. RMS, @ 8Ω, both channels driven, from 15Hz to 30kHz.
Power Bandwidth: 10Hz to 100kHz @ 8Ω, both channels driven
Signal to Noise Ratio: 107dB un-weighted (closed input), 122dB (20Hz to 20kHz) at full RMS output (closed input)
Total Harmonic Distortion (THD): <0.01% @ rated output, <0.005% @ half output
IMD: 0.008% @ rated power / 8Ω
Slew Rate: 30V/μsec @ 8 Ohms / 50V P-P
Damping Factor: 100 @ 8 Ohms / 20Hz to 20kH
Load Impedance: Rated for 16, 8 or 4 Ohm use
Input Impedance: 50k Ω nominal
Input Sensitivity: 1V for rated power into 8Ω
Channel Separation: 100 dB @ 1kHz and 80dB @ 20kHz
Input Connector: Standard RCA jacks

Again, as stated before, we have completely gone through this Mitsubishi DA-A10DC, Power Amplifier cleaning and testing all and it gets our full 'Certification'. This is an amazing performing and sounding amp. We have 'stood on it' hard, with a number of our speaker loads (the most fun being when connected to our Altec 'Voice of the Theaters'. It's a huge sounding and punchy amp, with lots of 'head room'. Handles 'REAL' high power levels perfectly well. If you are looking for serious, vintage power, it ain't gonna get much better than this.
Also includes the original 3-pin, umbilical speaker control cable for connecting the power amp to the speaker selection section of the pre-amp.

 Comes with an e-copy, pdf download, of the Mitsubishi DA-A10DC Owners Manual and Service Manual.
Measures standard 17" wide x 15" depth x 6.75" tall and weighs 46 lbs unpacked. Total weight of all three components is 65 lbs. Includes our standard 90 day limited warranty.
Mitsubishi DA-A10DC Power Amplifier / DA-M10 Meter / Control panel.
 Cond. 8.5+
all three components
SOLD 12/20/19
SHIPPED TO RICK IN INDIANA

DC-C20, DA-M10 & DA-A10DC
(see listing to the left for details on the 'Pre-amp / Tuner')

(Above text, in it's entirety, property of www.oaktreevintage.com / Oak Tree Enterprises, LLC. See 'Copyright Information' page for details)