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Purveyors of Electronic, Musical and Vintage goods from then, now and in between. 
Since 1982.

VINTAGE STEREO RECEIVERS
RESTORED CLASSICS 


Vintage Stereo Receivers & Used Stereo Receivers that have been Refurbished. Brands / models of Classic / Vintage Stereo Receivers, 'Old-School' / 2-Channel stereo receivers, and Quadraphonic / Quad AM/FM receivers such as Kenwood KR, MCS, Pioneer SX, Sansui G, Sony STR, Yamaha CR and Stereo / home audio receivers from the 1960's, 1970's & 1980's

.


 


 


CLASSIC 2-CHANNEL STEREO RECEIVERS . . .
 
    

    

NEW LISTING 6/16/16
  (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE PIONEER STEREO RECEIVER
PIONEER SX-1080 RECEIVER
HUGE POWER AND SIZE!
#...0872S

Circa 1978-79
MIJ

SOLD 6/21/16
SHIPPED TO UTAH

ü  Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all switches, controls and contacts. Extensive cleaning of unit internally.

ü  Controls were 'flooded' w/ 'De-OxId' and are quiet (very difficult to do as 'tone' section must be painstakingly removed).

ü  Switches such as the 'Function' selector and the 'Tone Bypass' switch were also flooded with cleaner.

ü  Sheared 'Bass Turnover' selector replaced with original Pioneer part.

ü  Bent shaft '-20dB Audio Mute' switch replaced with another original.

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

ü  World AC Power correctly set for North American current.

ü  We also aligned the tuner front-end on both AM & FM bands for optimum performance as older tuner components will have 'drifted' over the years.

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

ü  We replaced light bulbs, including ALL dial, meter & indicator lamps, the dial pointer lamp, 'Stereo' indicator, input / function indicators.

ü  Both power supply filter capacitors independently tested.

ü  All inputs tested and both sides produce clean and even sine waves into 'brick-wall' 8 & 4 ohm loads!

VERY GOOD FM TUNER!
FM reception as well great and IMPECCABLY CLEAN!!! All inputs tested and both sides produce 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. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours into a 4 Ohm load. Cosmetically, there are a few, light / shallow striations on the top surface of the face plate edge, a few 'tics' around the case, and a small scratch on one of the tone knobs, but nothing at all distracting (see photos above). Again, overall this is a fabulous receiver. You won't be disappointed. Total restoration time investment ~15.5 hours.  

On our test bench, the internal amplifiers of this receiver #...872S produced 35 volts per channel @ 8 ohms with 1Khz input for 153 watts and 32 volts per channel @ 4 ohms with 1Khz input for 256 watts via discrete outputs with 1 kHz input. (4x 2SB701a & 2SD737a).
 AC Idle current at 1.3mA, DC offset output adjusted to <4.3mVDC either channel (that is amazing). Floor noise measured .2mVAC / >60dB either channel.
   ____________________________


The Pioneer SX-1080 Stereo Receiver. Classic looking brushed-aluminum silver face and encased in a real wood Walnut veneer cabinet with solid Walnut wood corner caps. These are SERIOUS receivers and as listed above, this one has been 'certified' following the refurb by Oak Tree Vintage and is in incredible condition!!! 

Pioneer SX-1080 Features:
 

Tuner features:
- Weighted flywheel analog "slide-rule" tuning
- FM Muting Selector (separate from the 'Stereo' selector)
- Dual analog 'Signal Strength' and 'Tuning' VU meters
- FM Multi-Path Detector (handy when installing antenna for best positioning)
- Dual position FM De-emphasis selectable for 25 or 75 msec 

Pre-Amp / 'Control Amplifier' / Power Amp features:
- Direct Coupled (DC) Power Amp architecture
- A or B or A+B or Off speaker selector
 - Defeat-able 4-control / 2-band EQ. (Bass controls centered at 200 or 400 Hz and Treble @ 2.5 or 5kHz)
- Super quality de-tented Tone and Volume controls
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Stereo / Mono selector (for entire pre-amp section, not just FM tuner)
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Built-in 'Low' Filter to eliminate excess rumble from sources such as turntables
- Pre-Amp Out / Power-Amp Input / Loop

- Dual analog 'Power' VU meters

- -20dB Audio Muting for instant lowering of volume without adjusting the volume control. Great for ringing phones and cuing a record on your turntable

Inputs:
- Dual Phono / turntable inputs with Built-In Phono Pre-Amp
- Dual tape monitors with standard RCA I/O's (Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
 - Bi-Directional Tape 'Dubbing' capability
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
- Microphone input (be very careful with your 'home audio' speakers when inserting a mic into any stereo receiver)
- 1/4", stereo headphone jack
- Dual Phono inputs with phono 2 doubling as the Microphone input
- 1/4" front mounted Microphone input
- -20db Audio Muting

Other:
 - Pre-out / Main-in loop
 - 3 AC outlets (1 switched / 2 un-switched) for a total capacity of 300 watts


Original Pioneer SX-1080 Specifications:

  "The Pioneer SX-1080 has a continuous power output of 120 Watts per channel min @ 8 ohms & 150 Wpc @ 4 Ohms, from 20 hertz to 20,000 hertz with no more than 0.05% THD (measured utilizing AUX input)"
 
POWER / PRE AMP:

THD:
0.05% @ 120 WPC @ 8 Ohms & 0.02% @ 60 WPC down to 1 WPC @ 8 Ohms
Freq Response of power amp section:
@ full rated power 20-20kHz
 Potential frequency response of power amp section @ 1w:
5 Hz to 100 KHz, +0 dB, -3 dB
IMD utilizing AUX: 0.050% @
120 WPC 20-20kHz
Hum / Noise Ratio: 100dB
Damping factor:
30 @ 8Ω full bandwidth
Power Amp Input Impedance:
50k Ohms
Power Amp Input Sensitivity for Full Output:
1V
Tone Control ranges:

Bass: +/-7-10dB @ 100Hz
Treble:
+/-7-10dB @ 10kHz
Hi Filter: 6
KHz, 12dB/octave
Lo / 'Sub' Filter: 15Hz, 6dB/octave
Loudness Contour: + 6dB at 100 Hz, + 3dB at 10KHz at -40dB on volume control
Pre-Amp Input Impedance: 50k Ohms
Pre-Amp Input Sensitivity at all inputs except phono & mic: 150mV
Microphone Input Impedance: 50k Ohms
Input Freq Response (except Phono & Mic): 5-80kHz
Tape Output Impedance: 50k
Ω
Tape Output:
150mV

Pre-Amp Output Impedance & Level: 1V / 1k Ohms
Pre-Amp THD @ rated output: <0.05%
Pre-Amp S/N @ 'Tape' & 'AUX': 90dB

TUNER SPECS FOR FM:
Freq Response:
30-15kHz per FCC Regulations
S/N:
 > 80 dB Mono @ 65dBf
S/N: 
> 74 dB Stereo @ 74dBf
Useable Mono RF Sensitivity dBf / μV:
9.8dBf / 1.7μV
Capture Ratio:
1.0dB
Signal for 50dB quieting, Mono dBf / μV:  
14.2dBf / 2.8μV
Signal for 50dB quieting, Stereo dBf / μV:  37dBf / 39μV
De-Emphasis: selectable 25 or 75 μ-sec
THD w/ 100% modulation @ 1kHz, Mono: 
0.1%
THD w/ 100% modulation @ 1kHz, Stereo: 
0.15%
IF Response Ratio: 
100dB
Stereo Sub-Carrier Rejection: 
65dB
AM Carrier Rejection: 55dB
Spurious Rejection:
100 dB
Image Response Ratio:
90 dB
FM Alternate Channel Selectivity: 
80dB
Muting Threshold dBf / μV:
19.2dBf / 5μV
Stereo Separation:
50dB @ 1kHz or 35dB @ 30-15kHz

TUNER SPECS FOR AM:

RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity:
30dB
IF Response Rejection Ratio:
40dB
Image Response Rejection Ratio:
40dB
Signal to Noise Ratio:
50dB

PHONO SECTION SPECS:
Freq Response:
20-20kHz ±0.2dB
S/N:
76dB, ref 'shorted' input

Input Sensitivity:
2.5 mV @ 50kΩ
Overload limit:
200 mV @ 1kHz


Huge power supply in the Pioneer SX-1080 featuring 4X 71V / 22,000μF power supply filter caps following an incredible power transformer to feed 4 (four) TO-3 output transistors.
Again, we have completely gone through the Pioneer SX-1080 Stereo Receiver, as stated above and 'certified' it's ready to go!
Cosmetically, the real wood Walnut cabinet on this one is in fabulous condition. Face very clean with only the most minor of wear! Unit looks great and sounds HUGE! This is truly one of the "BIGGER BOYS" when it comes to CLASSIC STEREO RECEIVERS!
Measures 21.75" wide x 17.5" deep x 7" high and weighs a HEAVY 47 lbs unpacked. Includes our standard 90 day limited warranty!
 PIONEER SX-1080 STEREO RECEIVER
 Cond. 8.5++
SOLD 6/21/16
SHIPPED TO UTAH

(C) R.R.

 

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

 

    

NEW LISTING 5/20/16
  (Click on above thumbnails to enlarge photos) 
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE STEREO RECEIVER
YAMAHA CR-820 STEREO RECEIVER 
#...2506
circa 1977-'79

   MIJ!
  for sale

Our technician has completely gone through and 'Certified' this unit, cleaning everything including all switches, controls and contacts for quiet, positive operation.  We also aligned the tuner front-end for optimum performance as older tuner components have drifted over the years. Only issue that seems to be, is the 'OTS' tuning system seems to be only partially working. Most tuners do not have this, and frankly the few by other brands we have come thru, seem to have similar issues. Means when you remove your hand from the tuning knob, the tuner should 'lock', and an LED lights up. The tuner locks in fine to stations, but the LED only lights dimly. Not 'monetarily practical' to chase. All output transistors removed, independently tested on our Huntron Tracker semiconductor analyzer and reinstalled with fresh heat sink compound. Output transistor bias adjusted to correct 08.0mV . Re-tensioned internal fuse holder clips. Re-tensioned tuner string to relieve flywheel binding and re-centered pointer to correct dial position. Balance of tuner string inspected and weak section replaced.
We replaced ALL meter lamps and the dial pointer lamps with new units for trouble-free service. All inputs tested and both sides produce 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. Following restoration procedures, the unit was ran continuously on 'medium' volume, as all our amplifier / receivers are, into a 4 Ohm load, with "Loudness" on and both Tone Controls at 10 for 48 hours. You will not be disappointed. Total restoration time investment ~13 hours.

   
On our test bench, the internal amplifiers of this Yamaha CR-820 receiver #...6787 produced 24 volts per channel @ 8 ohms with 1Khz input for 72 watts and 20 volts per channel @ 4 ohms with 1Khz input for 100 watts via discrete, TO3, metal cased output devices (2x Toshiba 2SB557 & 2SD427 output transistors).
 AC Idle current at .35A, Bias current set to spec of 8mV.DC offset output <9mVDC either channel. Floor noise at <2.3mVAC either channel.

   ____________________________
   
   One of the classics from Yamaha! This is from one of the most sought after Yamaha receivers. Beautiful brushed solid aluminum front panel with analog, slide rule tuning dial. All original aluminum Yamaha knobs intact and in near new condition.
Features are:
   
  
 - Weighted flywheel analog AM/FM slide-rule tuning with lighted dial pointer
   - Separate Bass, Presence (mid) & Treble EQ with super quality de-tented controls
 - Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
   - Features Yamaha's own "Variable Loudness Contour" control utilizing high quality de-tented potentiometer 
   - Instant -20db audio level muting
   - Analog VU meters for tuning and signal strength
   - Stereo / Mono selector (for entire pre-amp section, not just FM tuner)
   - FM Muting
   - LED AFC Station lock & Stereo indicators
   - Speaker selector for A - B, A+B, or Off
 - Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
   - Dual tape monitors with bi-directional dubbing
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
   - Phono / Turntable input w/ built-in Phono Pre-Amp
   - Dual 1/4" Stereo Headphone Jacks

  
Original Yamaha CR-820 Specifications:

   The Yamaha CR-820 has a continuous power output of 50 watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.05% THD (measured utilizing AUX input)
  
  POWER / PRE AMP SPECIFICATIONS:
  THD; 0.05% @ full rated power
  IHF IMD; 0.05% @ full rated power
  Freq Response of power amp section;
  @ full rated power 20-20kHz
  IHF IMD;
0.05% @ 1 watt / 20-20kHz
 
  Potential power bandwidth power amp section; 10-50,000Hz
   Damping factor; 40 @ 8Ω / 1kHz
   Signal / Noise;  >97dB @ AUX / Tape
   Input Sensitivity AUX / Tape; 120mV @ 45kΩ
   Bass Control;  ±13dB @ 50hz
   Presence Control;  ±13dB @ 3khz
   Treble Control;  ±6dB @ 20khz
   Low Filter; 25Hz @ 12dB / Oct
   High Filter; 10kHz @ 12dB / Oct
   Loudness Control; Variable
 
  TUNER SPECS FOR FM;
Tuning Range;
88-108MHz
  Freq Response; 30-15kHz
  S/N @ 65dBf; > 77db Mono or 73dB Stereo
  Capture Ratio @ 65dBf; 1.0 dB
  THD Mono @ 1kHz; 0.1%
  THD Stereo @ 1kHz; 0.15%
  FM Alternate Channel Selectivity; 75dB
   Spurious Noise Ratio; 100dB
   IF Rejection; 90dB
  AM Suppression; 65 dB

  Useable Mono Sensitivity (IHF); 3.2 μV / 15.3 dBf
  Useable Stereo Sensitivity (IHF); 40 μV / 37.3 dBf
Muting Threshold; 5μV / 19.2 dBf
  Stereo Separation @ 1Hz; 40dB

   TUNER SPECS FOR AM;
   Tuning Range;
525-1605kHz
   S/N @ 80dB / m; >50db
  Useable Sensitivity (IHF Bar Antenna); 49dB / m
  Selectivity; 30dB @ 1kHz
  IF rejection; 55dB @ 1kHz
  THD; 0.4% @ 80dB / m
 
  PHONO SECTION SPECS;
  Freq Response;
RIAA deviation; ±0.5dB
  S/N; >92dB!!!, IHF-A
   Input Sensitivity; 2mV @ 50kΩ
  Overload limit; 120mV @ 1k

 
Again, we have completely gone through this Yamaha CR-820 Stereo Receiver, as stated above and, with the exception of the previously mentioned 'OTS' LED, it's 'certified' and 'Ready To Go'!
Huge, vertical finned heat sinks for great cooling efficiency of outputs. Great sounding 'Phono' section (check the corresponding S/N ration above). Also, check the S/N ratio of the FM tuner in 'Stereo'! The brushed Aluminum face and knobs are in great condition. The vinyl wrap, wood grain case is also in great condition. The unit looks fabulous, works and sounds great! Includes a pdf, 'e' copy, download of the Yamaha CR-820 owners / users / instruction manual. Receiver measures 20" wide x 15.5" deep x 6.5" high and weighs 29 lbs unpacked. Includes our standard 90 day limited warranty.
   YAMAHA CR-820 STEREO RECEIVER
   Cond. 8.5++

   $749.
(C) R.R.

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Did you know?
While the company 'Pioneer' was officially established in 1961, the founder was actually developing speakers as early as 1937. In 1962 Pioneer marketed the worlds first 'separate component' stereo system for the home, and in 1975, the worlds first 'component system' for the car. In 1984 they introduced the first CD player for the automotive use (and I was selling it then). Pioneer had many other 'firsts' and continue to be a major 'player' in consumer, professional and industrial electronics.

 

 

 


UPDATED LIST 7/11/16
Receivers Coming Soon
(or at least as time allows):

Kenwood KR-77
NAD 7120
Pioneer SX-1500T
Pioneer SX-1980
Pioneer SX-V90
Sansui 5000A
Sansui QR-4500
Sansui QRX-6500
Sansui QRX-7500
Yamaha CR-2040
Yamaha R-8
and more...

 

   

 NEW LISTING 4/29/16
  (Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE REALISTIC STEREO RECEIVER
REALISTIC  STA-2000 / STA2000
Orig Cat #31-2075

  #...7544
  CIRCA 1978

  for sale
Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots.
Amp has been cleaned inside and out. All internal control pots and switches are super quality. All Dial / Meter lamps replaced as well as the AM Function, FM Function and FM Stereo Indicator checked and or replaced for trouble free service. 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. The tuner works exceptionally well in our warehouse. Picks up both AM and FM bands way above average!!! All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! All functions test fine. 
     
While this unit was originally rated at 75 wpc, on our test bench, this particular unit, #...7544's amplifiers produced 28 volts per channel at 8 ohms for 98 watts per channel & 31 volts at 4 ohms for 126 watts per channel via discrete, TO-3, metal-cased output devices. (NEC 2SB539A & 2SD287A) DC adjusted down to <4mV L&R. AC idle current draw .35A. Floor noise measured at <0.1mVAC.
   ____________________________
   
Up to 1978, this was the pinnacle of Realistic's offerings. The STA-2000. This one also features an exceptional tuner. All the pots, controls and construction quality in general is way above average! It's built like a "brick ____ house"

Realistic STA-2000 Features include:

   
- Weighted flywheel analog "slide-rule" tuning with huge and heavy tuning knob and wide scale window
- Classic brushed Aluminum face panel
- Main & Remote speaker selectors
- Oversized volume control featuring high quality de-tented pot
   - Separate Bass and Treble controls utilizing high quality de-tented pots that are also Left and Right independent
- Pre-Amp / Power Amp loop
- FM Muting
(separate from Stereo / Mono selector)
- Mono selector (for the entire pre-amp section, not just the tuner and separate from FM muting selector)
- "Loudness" function to boost Bass in relationship to other frequencies at lower volume levels for a much fuller sound (careful using this as it's approx a 6dB boost!!!)
- Hi / MPX filter for reducing the 19kHz pilot tone and 38kHz harmonic in FM broadcasts
- Phono / Turntable input
- -20dB Audio Muting
-  Dual AUX Inputs (may also be used for Video / CD / DVD / VCR / iPod / DAT / MP3 / XM / SIRUS etc.)

- Dual Tape monitors with Bi-Directional Dubbing capability (Both tape monitors feature RCA and DIN I/O's)
  (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / 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) Dubbing can be used with CDR (CD recorders) units)
-  Dual back-lit, analog VU power meters
- Overload, Thermal and DC short protection built-in
- Analog 'Tuning' Meter for both AM and FM
- Front mounted 1/4" stereo headphone jack
- Speaker outputs via "bare wire" push clips and redundant RCA type
- Externally located main AC protection fuse
- Dual AC convenience outlets on rear panel with 1 switched and  un-switched totaling 200 watts capacity

   
 Realistic STA-2000 Original Specs:
Frequency Response: 15 Hz to 20 kHz ± 2dB
Signal/Noise ratio at AUX input: 75dB
Power Band Width: 20-20kHz
THD: <0.25% @ 75 Wpc
Power:
75 watts per channel
 
PRE-AMP SECTION SPECS;
Freq Response;
20-20kHz
Bass Control Range; ± 10dB @ 100Hz
Treble Control Range; ± 10dB @ 10kHz
Loudness Compensation; + 6dB @ 100Hz
Cross Talk; 65dB
Tape Out Leval; 140mV
 
 
PHONO SECTION SPECS;
Freq Response;
20-20kHz

S/N;
70 dB
Input Sensitivity;
2.2 mV @ 50kΩ
Overload limit;
230 mV
 
TUNER SPECS FOR FM;
Freq Response;
30-15kHz
S/N; > 70db Stereo
Mono Sensitivity; 1.7 μV
Capture Ratio; 1.5 dB
Image Rejection; 80dB
IF Rejection; 80dB

  
Again, we have completely gone through this Realistic STA-2000 Stereo Receiver, as stated above and 'certified' it's
'Ready To Go'! Real Walnut Wood veneer case in fabulous condition as is the milled aluminum face and all original knobs.
Fabulous performer. Again this receiver looks and sounds great! It's ready to go and ready to ROCK! Receiver measures 20.5" wide x 18" deep x 7" high and weighs 52 lbs unpacked. Includes our standard 90 day limited warranty.
REALISTIC STA-2000
Condition 8.5
$649.
(C) R.R.



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


 

 










Did you know?
A SUPER LOW DISTORTION RATING COULD LIKELY BE A BAD THING!...
THD
(Total Harmonic Distortion) – THD is a measure of the how much a given audio device may distort a signal through the inevitable introduction of added harmonics or overtones. These figures are usually given as percentages. THD figures below approximately 1% are inaudible to most people (although market promotion efficiencies have 'brain-washed' much of the 'audio-public' into weighting low THD with almost 'holy grail' importance. I remember some manufacturers touting numbers as low as <0.003% in the early Eighties).  Low THD is not always an indication of a high quality amplifier. In fact, it is / was more commonly just the opposite. Some of the 'highest end' (read REALLY expensive) and certainly best sounding units will have distortions somewhere between .1% & 1%.
Low THD is only a simple 'bi-product' of 2 aspects. The first was an inordinate and increasing amount of 'global / negative feedback' built into amplifiers primarily to suppress distortion. This practice started to occur in the late 1970's and certainly was in 'full force' past the early 1980's for most 'main stream' consumer-grade audio amplifiers. Unfortunately this also 'suppressed' tone and 'punch' (musicality) but it made the numbers look good to the 'spoon fed' consumer (kind of like overly high speaker wattage numbers, and sorry if you're in that group and, most folks were so you're not alone). Secondly manufacturers were moving away from 'discrete-transistor' output designs to more 'monolithic' 'power-pack' output designs. While these designs reduced power supply requirements, thus reducing parts costs and weight (also translates to lower prices due to savings on freight from Asia) they generally sounded anywhere from somewhat 'anemic' compared with the designs from a few years previous, to completely 'gutless' and 'un-musical'. But, hey,… they had very low distortion figures….Can anyone say 'threw the baby out with the bath water'?

Excerpts of the above text from the website of one of the best Car Audio sites and stores in the world, 'Car-Fi' www.car-fi.com .

  

 
 

 
    

NEW ADDITION 12/28/15
 
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE SANSUI STEREO RECEIVER
SANSUI 7900Z RECEIVER
#...0045
CIRCA 1981-82
MIJ

WORLD AC POWER"
SOLD 7/26/16
SHIPPING TO CALIFORNIA

Our technician has completely gone through and 'Certified' this unit, cleaning everything including all switches, controls and contacts for quiet, positive operation. AM & FM tuner re-aligned and front-end adjusted for optimum performance. Tuning capacitor thoroughly cleaned. All lamps were replaced including all dial with new lamps for trouble-free service. All inputs (including phono) tested and both side produces clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours.

  

On our test bench, the internal amplifiers of this particular unit  #...0045, produced a strong 34.4 volts per channel @ 8 ohms for 148 watts and 29 volts @ 4 ohms for 210 watts per channel via discrete outputs with 1 kHz input. (xSanken output transistors 2x 2SA1169 & 2X 2SC2773.
 
(DC: L= 1.2mV / R= 0.8mV. AC idle current overall at .35A. Floor noise measured at a low 0.1mV AC)
  ____________________________

  

Nice "High-Tech" looking silver-face Sansui 7900Z receiver. Combines the classic silver-face cosmetics and analog tuner, with digital tuning style display. This is a great looking and performing receiver.

Sansui 7900Z Features:

  
- Quartz-Locked, Digital tuner w/ Blue Fluorescent Digital station readout.
- Separate Bass and Treble utilizing super quality de-tented tone controls
- Tone Defeat selector for purest tone path
- "Quartz Locked" tuning with LED indicator to reduce station drifting
- 6 AM/ FM Station Presets w/ Battery Backup for 'non-volatile' memory
- A, B, & A+B speaker set selector
- Dual Tape monitors
  (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / MP3 / XM / SIRUS CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape dubbing 1 to 2
- AUX Input (may also be used for Video / CD / DVD / VCR / iPod / DAT / MP3 / XM / SIRUS etc.)

- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Dual Phono / Turntable inputs
- -20dB Instant Audio Muting
- Rear mounted AM adaptor, via single RCA jack
- Blue Fluorescent FM signal strength meter 
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- FM Muting / Mode selector
- Stereo / Mono selector (for the entire pre-amp section, not just the tuner and separate from FM muting selector)
- Dual 18 segment Blue Fluorescent power meters
- 6 Segment, Blue Fluorescent Spectrum Analyzer w/ level control
- Front mounted 1/4" stereo headphone jack
- Built-in, rotatable, AM ferrite "stick" antenna.
  - Dual-AC outlets on rear panel (1 switched 1 un-switched) with a total capacity of 250 watts.
- True
“WORLD AC POWER" as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts AC

  
Sansui 7900Z Original Specs:
   
"The Sansui 7900Z has a continuous power output of 100 watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.02% THD (measured utilizing AUX input)"
  
POWER / PRE AMP SPECIFICATIONS:
THD;
0.02% @ full rated power
Freq Response of power amp section; @ full rated power 20-20kHz
Potential frequency response of power amp section @ 1w; 5-100,000Hz ±0dB
  Damping factor; 40 @ 8Ω & full bandwidth
S/N;
100dB (non-phono input)
Bass Control;  ±10dB @ 50hz
Treble Control;  ±10dB @ 10khz
High Filter;  -3dB @ 5kHz @ 6dB Oct
"Loudness" Contour;  +8dB @ 50hz, +6dB @ 10khz (w/ volume set at -30dB)
Tape / AUX input level;
150 mV @ 47
Tape Output level;
150 mV @ 47
  
TUNER SPECS FOR FM;
Freq Response;
30-15kHz (per FCC regulations allowable freq range for FM)
S/N; > 76db Stereo @ 65 dBf
S/N; > 80db Mono @ 65 dBf
Useable Mono Sensitivity; 10.3 dBf (1.8μV)
Useable Stereo Sensitivity; 19 dBf
Capture Ratio; 1.0dB
Signal for 50dB quieting, Mono; 14 dBf
Signal for 50dB quieting, Stereo;
37 dBf
THD w/ 100% modulation @ 1kHz, Mono;  0.1%
THD w/ 100% modulation @ 1kHz, Stereo;  0.15%
Stereo Separation @ 1kHz; 45dB
FM Alternate Channel Selectivity; 75dB
Image Response Ratio; 80dB
Spurious Noise Ratio; 85dB
IF Response Ratio; 80dB

TUNER SPECS FOR AM;
Tuning Range;
530-1600kHz
S/N;
 >45db
Useable Sensitivity; 50dB / m with built-in, ferrite stick antenna
Selectivity; 30dB
Distortion: <0.5%
Image Response Ratio;
40dB @ 1kHz
IF Response Ratio; 35dB @ 1kHz
 

PHONO SECTION SPECS;
Freq Response;
20-20kHz

S/N;
80 dB, ref w/ shorted input

RIAA Curve Deviation;
+0.2dB / -0.2, 20-20kHz
Input Sensitivity;
2.5 mV @ 47

 
Again, we have completely gone through this Sansui 7900Z Stereo Receiver, as stated above and 'certified' it's 'Ready To Go'! Brushed aluminum face and all original knobs in fabulous shape. Wood grain, vinyl wrapped case in great shape as well. This unit looks near NEW! After restoration, receiver performs and sounds great! Measures 22.25" wide x 15.75" deep x 6.75" high and weighs 30 lbs unpacked. Includes our standard 90 day limited warranty!
SANSUI 7900Z STEREO RECEIVER
Condition 8.5
++
SOLD 7/26/16
SHIPPING TO CALIFORNIA

(C) R.R.



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



 



Did you know?
Sansui was founded in 1947, just after WWII as a company manufacturing transformers (one of the most important components of any audio system). During the Sixties they morphed into what would become one of the most well respected companies in quality audio gear. I have owned and sold some incredible Sansui stereo gear from the Seventies and early Eighties. I worked at a Sansui dealer in the early part of the Eighties. Sansui remained a major force in stereo gear until about the mid Eighties, when the vast majority of audio gear started suffering from the 'how cheaply can we get it' syndrome by consumers, thus manufacturers followed suit, by building cheaper and cheaper gear.

 

 


 

    

NEW LISTING 5/19/16
  (Click on above thumbnails to enlarge photos) 
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE NAD STEREO RECEIVER
NAD 7140 RECEIVER

#...6031
 Circa 1985-86

for sale
Our technician has completely gone through and 'Certified' this unit. Unit disassembled, then everything was cleaned inside and out including all switches, controls and contacts. Extensive cleaning of unit internally. Controls were 'flooded' w/ 'De-OxId' and are quiet. Internal fuses checked for correct value / function and replaced where necessary. We also aligned the tuner front-end on both AM & FM bands for optimum performance as older tuner components will have 'drifted' over the years. Amplifier section had output bias and DC offset adjusted to spec levels. All indicators checked and are LED's for trouble-free service.
All inputs tested and both sides produce 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, including tuner pre-sets. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48+ hours. You will not be disappointed.


While this model was originally rated at 40 watts / channel, on our test bench, this unit's (#...6031) amplifiers produced 23 volts per channel at 8 ohms for 66 watts per channel or 20 volts at 4 ohms for 100 watts per channel via discrete, output devices (B688 (x4) & D718 (x4)). 
 AC Idle current at 400mA, Bias adjusted



and DC offset output adjusted to < 1.3 mV DC either channel Floor noise @ <0.1mV AC either channel.

 This NAD is even stable for limited amounts of time into 2 ohms!

   _____________________________



 A classic NAD 7140, Stereo Receiver. NAD gear is famous for very plain, almost military appearances, but solid performance with lots of headroom. I used to sell these new and never remember an NAD owner who wasn't proud to own one. We've had two 7140's and following their service, the tuners performed fabulously, on both AM and FM. AM normally seems to be an 'after thought' on many stereo receivers, but this one tunes like an old, tube, table radio.

  NAD 7140 Features include:
 
- Digital tuning with a PLL circuit that provides 80 dB Stereo S/N
- 5 AM & FM station presets
- LED tuning indicators
- 5-Segment Signal Strength meter
- Auto or Manual Station / Frequency scanning
- Speaker output impedance selector (a very important aspect of this unit. Allows you to get all of it's power into a single pair of 8 ohms speakers if you need it)
- Bridgeable power amplifier
- Output selector for 8 or 4 Ohms speakers (meaning that you can get 100% FULL output into just ONE set of 8 Ohm speakers. All amplifiers / receivers should have this)
- Stereo / Mono selector
- Loudness control
- Loudness Compensation function
- Low-Level EQ compensation switch
- Input for CD
- AUX input for (Video / CD / DVD / VCR / DAT / MP3 / XM / SIRUS etc.)
- Phono / Turntable input with built-in Phono pre-amp.
- Selectable phono section for MM or MC turntable cartridges (MC head amp provides 20 dB gain)
- Tape monitor (Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Pre-Amp OUT / Power-Amp IN loop
- Balance
- NAD's "Soft Clip" feature for speaker protection and smoother sound at higher volumes (can be defeated)
- Bass EQ feature provides +6dB @ 32 Hz boost on the low-end
- NAD's "Infrasonic" filter for reducing Turntable / Tone-arm rumble
- 1/4" stereo headphone jack
- 2 Convenience AC outlets (1 switched

Original NAD 7140 Specifications:

"The NAD 7140 has a continuous power output of 40 watts per channel min @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.03% THD (measured utilizing AUX input) and & 65 wpc @ 4 Ohms at 'max continuous' output"
 
POWER / PRE AMP SPECIFICATIONS:

THD: 0.03% from 250mW to rated output of 40 Wpc @ 8 Ohms
IHF dynamic Headroom at 8 Ohms: +3dB
IHF dynamic MAX short term: 80W @ 8 Ohms, 95W @ 4 Ohms and 110W @ 2 Ohms
'Bridged' power at 8 Ohms: 100 Watts w/ dynamic, short term of 180 Watts
Slew Rate: 20V/usec
Damping factor:
>50 @ 8Ω full bandwidth
Power Amp Input Impedance:
20k Ohms
Power Amp Input Sensitivity for Full Output of 40 Watts:
1V
Tone Control ranges:
Bass:
+/-7
dB @ 100Hz
Treble: +/-7dB @ 10kHz
'Speaker Equalization' (Loudness) control w/ vol @-40dB: +3dB at 70 Hz, +6dB at 32Hz

Input Sensitivity at all inputs except phono & mic:
25mV for 1W output / 150mV for 50 Watts
Input max Voltage (excluding Phono): >10V

Input Freq Response (except Phono & Mic): 20Hz-20kHz
Tape Output Impedance:
1k Ohms
Pre-Amp Output Level Max / Impedance :
10 V / 800 Ohms
Pre-Amp THD @ rated output: <0.04%
Pre-Amp S/N @ 'Tape' & 'AUX': >102dB

TUNER SPECS FOR FM
Freq Response:
30-15kHz (per FCC regulations)
S/N:
 > 82dB Mono @ 75dBf
Useable Sensitivity (IHF):
9.8 dBf / 1.7μV
Capture Ratio:
1.5dB
THD w/ 100% modulation @ 1kHz, Mono: 
0.09%
(2.2 times better than a Pioneer SX-939 for example)
THD w/ 100% modulation @ 1kHz, Stereo: 
0.09%
(4.4 times better than a Pioneer SX-939 for example)
IF Rejection: 
75dB
Stereo Sub-Carrier Rejection: 
60dB

AM Carrier Rejection / Suppression ratio: >65dB
Image Rejection:
75 dB
FM Alternate Channel Selectivity: 
70dB
FM Adjacent Channel Selectivity: 8dB
Stereo Separation:
50dB @ 1kHz (10dB better than a Pioneer SX-939 for example)

TUNER SPECS FOR AM:

RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity:
35dB
IF Response Rejection Ratio:
50dB
Image Rejection:
50dB

PHONO SECTION SPECS:
Freq Response:
20-20kHz +/-5dB
S/N:
78dB w/ MM cart w/ 5mV & 76dB w/ MC cart w/ 0.5mV
RIAA Response Accuracy:
+/- 5dB

Input Sensitivity / Impedance:
0.4 mV @ 47 for 1 W and 2.5mV for 40 W output
Overload limit:
1.5V

 

 
Again, we have completely gone through this NAD 7140 Stereo Receiver, as stated above and 'certified' it's 'Ready To Go'! Speaker outputs feature heavy duty "banana" / binding post outputs. Includes a pdf, 'e' copy, download of the NAD 7140 owners / users / instruction manual, and brochure. Unit looks and sounds great! Measures 16.5" wide x 15.25" deep x 4.5" tall and weighs 20 lbs unpacked.
 Cond. 9
 NAD 7140
$459.
(C) C.B.S.


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

 











So, why do the older / 'vintage' receivers and amplifiers sound so much better (for music) than the much more modern and fancier, 'surround sound - 5.1', '7.1', or '8.BR549' A/V receivers?

 Mostly due to Amplifier design and 'Amplification Classes' - All sound is a sinusoidal waveform. It has alternating peaks and valleys. The center point of each wave is the zero, or switching point that separates the positive (top) from the negative (bottom) portion of each wave. When a amplifier operates in 'Class A' , the output tubes or transistors amplify the entire waveform without splitting it into positive and negative halves. In 'Class AB', (used in the majority of classic receiver / amplifier designs), the signal is split into two halves, positive and negative, and each half is sent to a tube or transistor circuit for amplification. Both sides work in tandem, and the two halves are recombined at the output section to reconstruct the whole signal. This technique increases the amount of power that can be applied, but increases distortion.
In many 'modern' A/V and subwoofer amps, 'Class-D' is the dominant design method. Class D operation is essentially a rapidly switching power amplifier. Here the output devices are rapidly switched on and off at least twice for each cycle. Theoretically, since the output devices are either completely on or completely off they do not dissipate any power (heat), greatly increasing efficiency and lowering manufacturing cost thru lesser parts and lighter freight weight. Not musically the best sounding design for listening to standard, 2-channel music (Radio, Vinyl, CD'S, DAT, Tape (not 'crappy' compressed, MP3 formatted files), but popular for 'A/V-Surround-Sound' systems for reproducing 'movie sound tracks' (not too difficult to do from a 'sonic quality standpoint') where slightly elevated levels of distortion are tolerated and for subwoofer use where maximum power is necessary, and slightly elevated levels of distortion are also easily tolerated.

Excerpts of the above text from the website of one of the best Car Audio sites and stores in the world, 'Car-Fi' www.car-fi.com .

  

 
 

 

    

NEW LISTING 5/12/16
  (Click on above thumbnails to enlarge photos) 
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE FISHER "STUDIO STANDARD" STEREO RECEIVER
FISHER RS-2004A STEREO RECEIVER

 
#...5859
  Circa late 1970's
  MIJ

  
for sale

 
Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. Amp has been cleaned inside and out. Only issue, and it's by design, is the the tuner flywheel's on the Fisher 'RS' series, always seem to have excessive 'play' in their bushings, which makes them a bit 'wobbly' feeling when turned. They function as a tuning knob should, just always have a bit of play. All dial / meter & function lamps replaced. All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent!  Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours.

On our test bench, the internal amplifiers of this particular unit  #...5859, produced peak power of 22.2 volts  per channel for 61 watts per channel @ 8 Ω via discrete output & 15.5 volts per channel for 60 watts per channel @ 4 Ω  via STK, 0050 Power Packs (same as Pioneer SX-780)
   ____________________________

  

Great looking Fisher receiver! Beautiful when lit up at night or in a dark room. Classic Silver and Wood look design. Brushed face with milled Aluminum knobs.

Fisher RS-2004A "Studio Standard" Features include:

  
- Weighted flywheel analog tuning
- Speaker Selector A, B, A+B, and Off speaker selector
- 5-Band, Graphic EQ featuring high quality de-tented tone controls (centers @ 50, 250, 1k, 4.5k and 15kHz)
 - Tone Defeat selector for purest tone path
- Rear located, vertical heat sinks to dissipate output generated heat away from the rest of the unit, outside of the case (All gear should be designed this way)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- FM Muting
- 25 /75 μsec De-Emphasis selector
- Phono / Turntable Input
- Tuning VU meters for signal strength
- AUX Input (may also be used for Video / CD / DVD / VCR / iPod /
iPhone / DAT / MP3 / XM / SIRUS etc.)

- Tape monitor
(Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / iPhone / MP3 / XM / SIRUS etc. and Dubbing can be used with CDR (CD recorders) units)
- 1/4" stereo headphone output on front panel
- Built-in ferrite 'stick' AM antenna
- Rear located main AC protection fuse
- Dual AC outlets (1 switched / 1 un-switched) for a total capacity of 180 watts
 
 
Again, we have completely gone through this Fisher 'Studio Standard' RS-2004A Stereo Receiver, as stated above and 'certified' it's 'Ready To Go'! Brushed Silver face and matching knobs all in great condition. Wood grained vinyl case also in "like new" shape as well. This is a very "Punchy" sounding amp. Tuner performs amazingly well, esp on AM which seems to be often overlooked on stereo receivers. Great headroom and warmth. Unit looks and sounds great. Ready to go! Measures 19.25" wide x 14.75" deep x 5.75" tall and weighs 29 lbs unpacked. Comes with our standard 90 day limited warranty.
 Fisher RS-2004A "Studio Standard" Stereo Receiver

  Condition 8.5
$349.
 


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

 

    

NEW LISTING 6/16/16
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE SHERWOOD STEREO RECEIVER
SHERWOOD S-7250-CP
AM/FM STEREO RECEIVER
#...2068

Circa '77-79
for sale
  
Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all switches, controls and contacts.
- Internal fuses checked for correct value / function and replaced where necessary.  
- Controls tightened to chassis.
- Amplifier section had output bias and DC offset adjusted to spec levels.  
- All dial / meter illumination lamps were replaced.
- We also aligned the tuner front-end, FM MPX and dial alignment on both AM & FM bands for optimum performance as older tuner components will have 'drifted' over the years. 
INCREDIBLE TUNER! AM reception WAY above average, FM reception incredible, PUNCHY and MUSICAL and IMPECCABLY CLEAN!!!
-
Following above procedures, all functions tested for perfect operation and unit was cosmetically detailed inside and out.  
-
All inputs tested and both sides produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions tested for perfect operation.  
-
Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a 4 Ohm load with "Loudness" on and both Tone Controls at 10 for 12 hours.
  
On our test bench, each internal amplifier of this particular unit, #...2068, produced peak power of 16.5 volts per channel for 34 watts per channel @ 8 ohm and 14 volts @ 4 ohm for 49 watts per channel via discrete output devices at 1khz. AC Idle current at .3A, & floor noise -60dB. Bias adjusted.

____________________________
  

Beautiful condition, late 70's silver face receiver from Sherwood. Great performance for a 'small-mid-sized' 2-Channel audio system. This is an INCREDIBLEY ‘Musical’ sounding receiver. The tone / pre-amp section very transparent and ‘glassy’ sounding, even with only the FM tuner as a source! Nice looking classic brushed aluminum face and knobs with only minor scuffs. 
Sherwood S-7250 Features:
  
- Weighted flywheel analog slide rule tuning
- A, B, A&B speaker selector
- Separate Bass and Treble controls utilizing high quality de-tented pots
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- FM Muting (not associated with the 'FM Stereo' function)
- Analog back lit, 'combo' meter for center tuning and signal strength
- Phono / Turntable input with Built-In Phono Pre-Amp
- 'True' Tape Monitor with a DIN input as well as the standard RCA I/O's

(Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
   - Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)

- Built-in AM ferrite antenna
- Externally located Speaker Protection fuses as well as the AC mains fuse
- Un-switched AC
convenience outlet rated to 150 Watts

Again, we have done the previously stated refurbishment / restoration work (~6+ hours) on this unit to insure its performance, and it gets our full 'Certification'. All functions tested for perfect operation. This receiver has an awesome tuner.  All in all it's a VERY 'musical' and 'punchy' sounding receiver / amplifier. Looks NEAR NEW and sounds great! Measures 17" wide x 5.25" tall x 12" deep and weighs an impressive 18 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 9
SHERWOOD S-7250 STEREO RECEIVER
$349.


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

 

 

 

 

 



WE HAVE RECENTLY RESTORED A FEW MID-SIZE TO LARGE POWER RECEIVERS, AND WILL BE POSTING THEM AS TIME ALLOWS OVER THE NEXT FEW WEEKS...
 

 

- - -

 

 



Did you know?

What is the difference between a ‘Tuner’ and a ‘Receiver'?

A ‘Tuner’ is the component or aspect of an audio system that receives or ‘Tunes-In’ Radio Stations.
A 2-channel, stereo ‘Receiver’ is really 3 units in one!
It’s a ‘Tuner’ for receiving radio stations. It’s a ‘Pre-Amp / Control-Amp’ for source / input selection & tone / audio signal modification (with likely the phono 'pre-amp / head-amp' built-in). Lastly it’s a ‘Power Amplifier’ to energize your speakers. It's essentially the 'heart' of most audio / stereo systems.
Some manufacturers would silk-screen 'Tuner-Amplifier' on the front of their receivers, but that was / is simply 'marketing' to make it sound as if it's something more complicated. It's still a 'receiver'. Just FYI.


 
 

 

 

What is a 'Receiver' and how is it different than a 'Tuner' or an 'Amp'?
The term 'Receiver' refers to a combined unit consisting of at least 3 aspects incorporated into one. The 3 basic units are the AM/FM 'Tuner' or radio, a 'Pre-Amplifier' / 'Control-Amp' and a 'Power-Amplifier' all combined in one 'box'. Originally the general consensus was that 'receivers' did not perform as well as 'separates' and were sonically inferior. While this may have been the case early on, as in the

 

late 1950's to early '60's, technology improved quickly and by the mid-late 60's the arguments for separates over receivers for most 'mid-level' consumer Hi-Fi applications were generally without merit. For 95% of home-audio listeners, a receiver will be more than ample.

 


 

 


Click here for our Restoration Procedures



 
- -  

 

Jerry Gahagan of OakTreeVintage
Taken in portion of Speaker Audition Room
Vintage Home Audio Speakers from the late 1960's into the 1980's

 

 

-
SOLD ITEMS BELOW

 



 

 
 


CLICK HERE TO SEE OUR ARCHIVE OF
 SOLD RECEIVERS.
 

WE WILL LIKELY GET MORE OF THEM AGAIN!!!

    

NEW LISTING 5/10/6
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE-CLASSIC SANSUI STEREO RECEIVER
SANSUI G-6000 STEREO RECEIVER
"DIRECT COUPLED" POWER AMPLIFIERS
#...1806

 CIRCA 1979

WORLD AC POWER"
 MIJ

SOLD 5/11/16
SHIPPING TO NORTH CAROLINA

Our technician has completely gone through and 'Certified' this unit, cleaning everything including all switches, controls and contacts for quiet, positive operation.
Extra attention is ALWAYS necessary on Sansui units to the 'Input Selector' and 'Tape Monitor' switches, and they were thoroughly cleaned and tested (one great thing about the "G" series, over it's predecessor series, the 990/9090 and 8080, is that the input selector contacts are not also conducting the 'dial lamps', so a common intermittent dial lamp issue with those units is averted on the G-6000). Correct line fuse installed. He also re-flowed all dial lamp solder joints, especially at the 'extremes' of the board. ALL NEW dial lamps light solidly and inputs sonically intact.  DC offset and Bias current set to spec. We also aligned the tuner dial indicator and tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. All dial, all meter (including the very difficult to replace power meter lamps), all function indicator and stereo indicator lamps replaced with new units for years of trouble-free service. Once the unit's electronics were addressed, it was cosmetically detailed inside and out. All original, extruded face, and milled aluminum knobs in great shape after detailing. Internal and external dial screen and window in perfect shape. All inputs tested, including both phonos, and both amplifiers produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. The entire receiver looks NEAR NEW, including face, knobs, dial glass and wood, grain vinyl wrapped bonnet. Following restoration procedures, the unit was operated continuously at medium volume, as all our amplifier / receivers are, into a load with ""Loudness"" on and both Tone Controls at 10 for 72 hours.

On our test bench, this particular Sansui G-6000, #...1806, amplifiers each produced 27.75 volts per channel for 96 watts per channel @ 8 Ω via discrete output & 24 volts per channel for 144 watts per channel @ 4 Ω via discrete outputs.
 (AC draw at idle 375mA tested,
DC offset adjusted to 0.8mV each side.
Floor noise measured at L=00.1mVAC and R=00.1mVAC)
  ___________________________
 

  
  Here's the first Sansui G-6000 we've ever had! What a beautiful piece. If this was not a consignment unit, it would be going to my personal collection. I thoroughly enjoyed auditioning this receiver. I happen to think the 'G-X000 Series' was the most impressive looking receivers ever built by any manufacturer. The controls have the highest quality 'feel' about them. Massive 'sculpted' knobs, milled from solid aluminum (the later series looked like this, but had knobs that were aluminum 'caps' over plastic bases). The front end is similar to the massive and famous (and VERY expensive) Sansui G-22,000 and G-33,000. These are known for great tuners, and amp's that you can "darn near weld with". The tuner quality on both AM & FM is exceptional (the audition sheet notes "spectacular AM" tuner response as well).
The amps are incredibly warm sounding with HUGE punch and headroom. Very "Musical" sounding with real output transistors and huge power supplies. A testament to the strength of the power supply is that the results we achieved on the test bench (see above test results).
The difference in tone of a 'G' series, with a 'clean bill of health', and most other receivers is astronomical. Sort of like the difference between driving a 130hp car and a 400hp car or a 350cc bike and and 1100cc Harley. It's a difference that must be experienced to be appreciated.

Sansui G-6000 Features include:
 

- Super-Heavy, Weighted analog flywheel tuning with fully lit "Slide Rule" dial
- Dual band EQ featuring high quality de-tented pots
- Tone Defeat selector for purest tone path
- Heavy, 'milled' aluminum, sculpted knobs
- A, B, A+B, & OFF speaker set selector
- Dual Tape monitors (plus 4-Ch / NR Adaptor can be used as an additional 'loop' if needed)
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / 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) (2 offers both RCA & DIN I/O's)
- AUX Input (may also be used for Video / CD / DVD / VCR / iPod / DAT / MP3 / XM / SIRUS etc.)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Dual Phono / Turntable inputs
- -20dB Instant Audio Muting
- Dolby FM de-emphasis
- 4 channel / NR adaptor inputs and outputs
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Built-in "Low" / Subsonic Filter to eliminate excess rumble from sources such as turntables
- FM muting, separate from FM stereo selector
- Stereo / Mono mode selector for Pre-Amp section (separate from 'FM Mode' selector)
- Dual Analog, VU Power Meters
- Analog, VU style, Tuning and signal strength meters
- Front mounted 1/4" Microphone jack (be careful with your speakers if you're going to utilize a microphone on a 'home' audio system)
- Microphone Level / Mixing control (be very careful with your speakers when using this function)
- Front mounted 1/4" stereo headphone jack
- Triple-AC outlets on rear panel (1 switched & 1 un-switched) with a total capacity of 250 watts.
- True
“WORLD AC POWER"™ as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts AC

Sansui G-6000 Original Specs:
  
"The Sansui G-6000 has a continuous power output of 65 watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.03% THD (measured utilizing AUX input)"
 
POWER / PRE AMP SPECIFICATIONS:
THD;
<0.03% @ full rated power
Potential Freq Response of Pre-amp section;
measured @ 1w; 5-50,000Hz +0.2dB / -2dB
Potential Freq Response of power amp section;
Potential frequency response of power amp section DC-200KHz & @ 1w; +0dB / -3.0dB
IMD utilizing AUX;
 <0.03% @ full rated power / 20-20kHz
Slew Rate; 58V / μ-sec
Damping factor; 30 @ 8Ω & full bandwidth
Hum and Noise;
  95dB @ AUX / Tape
Input Sensitivity AUX / Tape; 150mV @ 47kΩ
Tape 1/2 Output level, via RCA; 150mV
Tape 2 Output level, via DIN I/O; 43mV
Stereo / Channel Separation @ 1kHz; 65dB
Bass Control;  ±10dB @ 50hz
Treble Control;  ±10dB @ 10khz
Low Filter;  -3dB @ 16Hz @ 6dB Oct
High Filter;  -3dB @ 3kHz @ 6dB Oct
"Loudness" Contour;  +8dB @ 50hz, +6dB @ 10khz (w/ volume set at -30dB)
 

SANSUI G-6000 TUNER SPECS FOR FM;
Tuning Range;
88-108mHz
Freq Response;
30-15kHz
S/N @ 65dBf; > 68db Stereo
S/N @ 65dBf; > 72db Mono
Useable Mono Sensitivity; 10.3 dBf (1.8μV)
Useable Stereo Sensitivity; 17.0 dBf
Capture Ratio; 1.0dB
Image Response Ratio; 70dB
Spurious Noise Ratio; 90dB
IF Response Ratio; 95dB
Signal for 50dB quieting, Mono; 14dBf
Signal for 50dB quieting, Stereo; 36.0dBf
THD 65dBf @ 1kHz, Mono;  0.13%
THD 65dBf @ 1kHz, Stereo;  0.18%
Stereo Separation @ 100Hz; 35dB
Stereo Separation @ 1kHz; 42dB
Stereo Separation @ 10kHz; 30dB
Stereo Separation @ 35Hz-15kHz; 25dB
FM Alternate Channel Selectivity; 75dB @ 400 Hz

TUNER SPECS FOR AM;
Tuning Range;
530-1600kHz
S/N;
 > 46db
Useable Sensitivity; 300μV / m with ferrite stick antenna or 50dB / m with external antenna
Selectivity
±10khz; 35dB
Distortion @ 30% modulation, 80dB/m: 0.5%


PHONO SECTION SPECS;
Freq Response;
20-20kHz

S/N;
78 dB, ref w/ 'shorted' input

RIAA Deviation; 20-20kHz +0.2dB / -0.2dB
Stereo / Channel Separation @ 1kHz; 60dB
Input Sensitivity;
2.5 mV @ 47kΩ
Overload limit;
220 mV @ 1kHz


Again, as stated before, we have completely gone through this unit cleaning, refurbishing and testing all. This is an incredible sounding receiver in all aspects. Due to it's huge power output
(again, we were able to get 145 watts per channel, into a 4 Ohm load)
, even at very low volumes it sound's like a "Class-A" amplifier. The controls are very "musical" sounding, especially the tone control circuit. Also, the reception on both the AM and FM tuning bands are excellent, and the AM is exceptional for a stereo receiver. For the majority of folks, exceptional AM would be inconsequential, but if it is important to you, like it is to me, this becomes an all-around, very usable receiver and a pleasure to use. Beautiful aluminum face, with it's beveled dial glass and all original, milled knobs in fabulous shape. Wood grain, vinyl wrapped case in fine shape as well. Unit looks great and sounds HUGE! This thing is incredible when lit up at night or in a dark room!! Includes a pdf / 'e-copy' download of the Sansui G-6000 Brochure and Service manual (sorry, no owners / users manual available at this time). Measures 20" wide x 7.5" tall x 16.25" deep and weighs and heavy 39 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI G-6000 STEREO RECEIVER
Cond. 8.5+++

SOLD 5/11/16
SHIPPING TO NORTH CAROLINA

R.R. (C)

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



 

 

 

    

NEW LISTING 5/12/16
  (Click on above thumbnails to enlarge photos) 
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE & BEAUTIFUL PIONEER STEREO RECEIVER
THE CLASSIC PIONEER SX-939 / SX939

Circa 1974-76
"WORLD AC POWER" ™
MIJ

 
for sale
SOLD 5/14/16
SHIPPING TO OHIO

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

ü Everything was cleaned inside and out including all contacts, switches and controls.

ü Multiple (ALL), 'typically-sticky' push switches removed, overhauled / cleaned and lubed across front

ü Dial glass removed and completely / solidly re-attached

ü Skewed control shafts straightened

ü All dial / meter lamps / bulbs replaced for trouble-free service

ü Electrolytic power supply filter capacitors tested for leakage

ü All question-able and common 'stress point' solder joints re-flowed

ü All 4 power transistors removed, tested for leakage

ü All output transistors re-installed with fresh heat-sink compound (usually good for 20-30 years)

ü Bias current adjusted to correct levels.

ü DC offset adjusted to super low levels.

ü  We also aligned the tuner for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! AM reception WAY above average, FM reception incredible, PUNCHY, with GREAT SEPARATION and IMPECCABLY CLEAN!!! due to the 'Pair of Dual-Gate MOS-FETS' FM front end and the quality of the restoration.

ü  Entire unit cleaned / detailed cosmetically inside and out. Receiver looks FABULOUS and NEAR NEW!

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

ü  Following restoration procedures, the unit was run continuously at medium volume, as all our amplifiers / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours and into a 4 Ohm Load!

You will not be disappointed. Total restoration time investment ~9 hours.  

On our test bench, the internal amplifiers of this Pioneer SX-393 receiver, #...460M produced 27 volts per channel @ 8 ohms with 1Khz input for 91 watts and 18 volts per channel @ 4 ohms with 1Khz input for 144 watts via discrete, TO-3, metal cased outputs.
 AC Idle current at 460mA, Bias adjusted and DC offset output adjusted to < 0.5 mV DC either channel Floor noise @ <0.5mV AC either channel.
   ____________________________


This is from the series that is commonly referred to as Pioneer's 'Blue Face' receiver offering. Beautiful receiver. Classic looking brushed-aluminum silver face panel, surrounding 'smoked' dial glass, with 'aqua back-lit' enumeration. All encased in a walnut grain, vinyl wrapped, cabinet with solid Walnut wood corner caps. These are SERIOUS receivers and this one has been 'certified' following the refurb by Oak Tree Vintage and is in great condition!!!
 
Pioneer SX-939 Stereo Receiver Features:
 

Tuner features:
- Weighted flywheel analog "slide-rule" tuning
- PLL FM Tuning and 'Dual Mos-Fet' circuitry
- 7 Gang Tuning Capacitor
- Fully Shielded tuner 'Front End'
- FM Muting Selector (separate from the 'Stereo' selector)
- Dual analog 'Signal Strength' and 'Tuning' VU meters
- FM Detector / 4-channel RCA output
- Dual position FM De-emphasis selectable for 50 or 75 msec
- Built-In AM 'Stick / Bar' antenna 

Pre-Amp / 'Control Amplifier' features:
- A, B, C, A+B, A+C, B+C & Off speaker selector (max 2 pair at a time, just with most all receivers / amplifiers to maintain a 4 Ohm minimum)
- Quasi-Quad-Band EQ w/ Sub-Bass, Bass, Treble and Super-Treble controls
- Tone Defeat for purest signal path
- Super quality de-tented Tone and Volume controls
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Stereo / Mono selector (for entire pre-amp section, not just FM tuner)
- 'Scratch-Filter / Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Built-in 'Low' Filter to eliminate excess rumble from sources such as turntables
--20dB Audio Muting for instant lowering of volume without adjusting the volume control. Great for ringing phones and cuing a record on your turntable

Pioneer SX-939 Inputs:
- Dual Phono / turntable inputs with Built-In Phono Pre-Amps
- Dual tape monitors with Tape monitor 'B' also featuring a DIN input as well as the standard RCA I/O's
(Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Bi-Directional Tape 'Dubbing' capability
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
- Dolby 'Adaptor' Loop can be used as an additional input or as a signal processor loop for EQ, Dynamic Range Expanders, Reverbs, Delays, DBX units, etc.
- Dual 1/4", stereo headphone jacks
- Dual Phono inputs with phono 2 doubling
- Dual 1/4" front mounted Microphone inputs (be careful with your 'home audio' speakers utilizing 'microphones' with them)

Other:
- Pre-out / Main-in loop (allows feed to an additional / larger power amp, or to 'direct feed' the power-amp in the receiver with another pre-amp or audio mixer)
- Easy 'Serviceable' internal design
- Triple AC 'Convenience' outlets (1 switched / 2 un-switched) with a total capacity of 300 watts
  - True “
WORLD AC POWER"
as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts AC
 

Original Pioneer SX-939 Specifications:

  "The SX-939 has a continuous power output of 70 watts per channel min @ 8 ohms & 60 wpc @ 4 Ohms, from 20 hertz to 20,000 hertz with no more than 0.3% THD (measured utilizing AUX input)"
 
POWER / PRE AMP SPECIFICATIONS:

THD:
0.3% @ 70 Wpc @ 8 Ohms & THD 0.05% @ 1 wpc @ 8 Ohms
Freq Response of power amp section: @ full rated power 20-20kHz
Potential frequency response of power amp section @ 1w:
7Hz to 100KHz, + 0 dB,- 1 dB
IMD utilizing AUX: 0.3% @ 85 wpc & 0.05% @ 1 wpc @ 8 Ohms
Hum / Noise Ratio: 110dB (10dB increase over the SX-950)
Damping factor:
45 @ 8Ω full bandwidth (almost double the SX-950)
Power Amp Input Impedance:
50k Ohms
Power Amp Input Sensitivity for Full Output:
1V
Headphone: 4-16 Ohms
Tone Control ranges:
Sub Bass: +/-5dB @ 50Hz
Bass:
+/-10
dB @ 100Hz
Treble: +/-10dB @ 10kHz
Super Treble: +/-5dB @ 20kHz
Hi-Cut / Scratch Filter: -9dB  10
KHz, 6dB/octave
Lo Cut Filter: -8dB / 50Hz, 6dB/octave
Loudness Contour w/ vol @-40dB: +8dB at 100 Hz, +4dB at 10KHz
Pre-Amp Input Sensitivity at all inputs except phono & mic:
150mV
Microphone Input Impedance:
2.0mV / 50k Ohms
Input Sensitivity at all inputs except phono & mic:
150mV / 70k Ohms
Input Freq Response (except Phono & Mic): 10Hz-40kHz
Tape Output:
150mV @ RCAs &
30mV @ DIN
Pre-Amp Output Level / Impedance :
1V / 1k Ohms
Pre-Amp THD @ rated output: <0.1%
Pre-Amp S/N @ 'Tape' & 'AUX': >95dB
Pre-Amp S/N @ ''Microphone': >65
dB

TUNER SPECS FOR FM

(essentially similar specs on the SX-950 and SX-838)
:
Freq Response:
20-15kHz (actually beyond FCC regulations)
S/N:
 > 70dB Mono @ 65dBf
Useable Sensitivity (IHF):
1.8μV
Capture Ratio:
1.0dB
De-Emphasis: selectable 50 or 75 μ-sec
THD w/ 100% modulation @ 1kHz, Mono: 
0.2%
THD w/ 100% modulation @ 1kHz, Stereo: 
0.4%
IF Rejection: 
100dB
Stereo Sub-Carrier Rejection: 
65dB

AM Carrier Rejection / Suppression ratio: 55dB
Spurious Rejection:
100 dB
Image Rejection:
85 dB
FM Alternate Channel Selectivity: 
80dB
Stereo Separation:
40dB @ 1kHz

TUNER SPECS FOR AM:

RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity:
40dB
IF Response Rejection Ratio:
85dB
Image Rejection:
65dB
Signal to Noise Ratio:
50dB


PHONO SECTION SPECS:
Freq Response:
30-15kHz
S/N:
>70dB, ref w/ 10mV input

Input Sensitivity 'Phono-1' or 'Phone-2':
2.5 mV @ 50kΩ
Overload limit:
250mV RMS / 700mV P-P @ 1kHz


Most techs, including myself, who have been inside of the various SX Pioneer series receivers, can see quite a few examples of why they believe earlier series are better built than the later series, especially once 1980-81 rolled around. Evidenced by TO-3, metal cased outputs, shielding around the control pots and some sensitive circuit boards to reduce RFI noise, heavier control pots and Molex connected pre-driver / output circuit boards to facilitate future service.
Again, we have completely gone through this Pioneer SX-939 Stereo Receiver, as stated above and 'certified' it's ready to go!
This is the first SX-939 we've had in almost 19 years of having the website.
Cosmetically the unit is in overall fabulous condition. Unit looks near new, works great and sounds HUGE! Includes an 'e' copy / pdf download of the original Pioneer SX-939 owners / users / instruction manual, and brochure. Measures 20.5" wide x 16.5" deep x 6.75" high and weighs a HEAVY 41 lbs unpacked. Includes our standard 90 day limited warranty!
PIONEER SX-939 STEREO RECEIVER
Cond. 8.5+++

(C) R.R.

SOLD 5/14/16
SHIPPING TO OHIO


 

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

 

 
         

    

NEW LISTING 5/9/16
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
HUGE & VINTAGE KENWOOD RECEIVER
KENWOOD ELEVEN GX STEREO RECEIVER (North American KR-11000GX)
#...0453
circa ~1978-80
"WORLD AC POWER" ™
MIJ!

SOLD 5/24/16
SHIPPING TO INDIANA

Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all switches, controls and contacts. Extensive cleaning of unit internally. Controls were 'flooded' w/ 'De-OxId' and are quiet
(very difficult to do as 'tone' section must be painstakingly removed). Switches such as the 'Function' selector and the 'Tone Bypass' switch were also flooded with cleaner. Internal fuses checked for correct value / function and replaced where necessary. World AC Power correctly set for North American current. Dial string / cord replaced. We also aligned the tuner front-end on both AM & FM bands for optimum performance as older tuner components will have 'drifted' over the years. We also aligned the digital station display to correspond to the 'analog dial' position. Amplifier section had output bias and DC offset adjusted to spec levels. We replaced ALL, meaning '21' light bulbs, including ALL dial, meter & indicator lamps, the dial pointer lamp, 'Stereo' indicator, input / function indicators, and the timer LED with new units for trouble-free service. 'Hidden' trace issues on 'bridge multiplier' and 'function switch board' repaired. Broken speaker post rebuilt / replaced. Both power supply filter capacitors removed and independently tested. Other minor electrolytic capacitors tested and replaced where necessary.
All inputs tested and both sides produce 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, including the 'Timer'
(Normally we disconnect the 'timers' on these Kenwoods due to a nylon connector linkage sleeve that will likely break in the future (almost 100% of the time) from a user applying too much torque at some point. We avoid this likely future issue by disconnecting the linkage on all the Kenwoods that have a timer. However, on this unit, the linkage was about THREE TIMES the diameter of all the others, and strong enough to leave engaged). Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72+ hours. Total restoration time investment ~14 hours. You will not be disappointed.
   
From the original Kenwood 'KR-11000GX' Service manual, "120 watts per channel minimum RMS, both channel driven at 8 ohms from 20 Hz to 20,000Hz with no more than 0.03% total harmonic distortion"
- However-
On our test bench, the internal amplifiers of this receiver #...0453, produced 35 volts per channel @ 8 ohms with 1Khz input for 153 watts and 27 volts per channel @ 4 ohms with 1Khz input for 182 watts via discrete, TO3, metal cased outputs. (2x Toshiba 2SB600 & 2x 2SD555)
 AC Idle current at .7A, & floor noise < 2.5mVAC and DC offset <17mV.

   _____________________________
   
One of the 'Big Boys' Stereo Receivers from Kenwood! This is the Kenwood 'Eleven GX'
(similar to most of the Kenwood 'Eleven / KR-11000" models, and the "Eleven GX" is the North American version of the "KR-11000GX", sold in Europe and Asia). Beautiful Brushed Silver, aluminum face with gorgeous, BLUE backlit analog, slide rule tuning dial, analog VU meters.
VERY elegant and IMPRESSIVE unit when lit in a darkened room.
All original milled, aluminum Kenwood knobs intact. Original, wood grain, vinyl wrapped case in spectacular condition with only VERY minor wear. Entire unit is a thing of beauty.

Kenwood Eleven-GX Stereo Receiver Features:

Pre-Amp / 'Power Amplifier' features;

- Built-In, 1.3 Octave, 5-Band, Graphic EQ ('Multiple Acoustic Compensator') with super quality de-tented controls (centers at 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz)
- Super quality, De-tented Volume control
- Tone ('M.A.C.) Defeat selector for 'purest' signal path if desired
- Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
- Dual tape monitors with bi-directional dubbing
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape 'Two' has both standard RCA inputs as well as DIN I/O's
- Dual Phono / Turntable inputs w/ built-in Phone Pre-Amp
- Triple Pair Speaker Selector; A, B, or C or A+B or A+ C or Off speaker selector (two pair at a time)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Dual analog VU meters for Power Output w/ dual range selector
- Stereo / Mono selector (for entire pre-amp section, not just FM tuner)
- 'Variable' Hi / MPX filter for reducing the 19kHz pilot tone and 38kHz harmonic in FM broadcasts (variable from 3KHz to 20kHz)
- 'Variable'  Low / Subsonic Filter to eliminate excess rumble from sources such as turntables (variable from 18Hz to 200Hz)

- 1/4" front mounted, Microphone input jack w/ 'Mixing / Level' and 'Pan' pots to inject your voice or other instrument signal into current program. (turns the unit into the ultimate Karaoke Machine (be very careful with your speakers when inserting a mic into a stereo receiver) (BE CAREFUL WITH YOUR SPEAKERS DOING THIS!!!)
- Dual 1/4" Stereo Headphone Jacks


Tuner features:

- Weighted flywheel analog AM/FM slide-rule tuning with lighted dial pointer
- FM Muting to eliminate 'hiss' between stations.
- Rear mounted FM 'De-Emphasis' selector for either 25, 50 or 75μsec
- 'Stereo' indicator
- Analog Tuning Center meter
- Analog Signal Strength meter
- Built-In AM 'Stick' Antenna

Other:

- Dolby 'Adaptor' Loop can be used as an additional input or as a signal processor loop for EQ, Dynamic Range Expanders, Reverbs, Delays, DBX units, etc.
- 120 Minute 'Sleep Timer' (that actually STILL WORKS on this one, but be careful with turning knob)
- Triple AC convenience outlets; 2 'Switched' and 1 'Un-Switched for a total rated capacity of 400 watts
- True "
WORLD AC POWER" 50 / 60 cycles and 110V, 120V, 220V & 240V AC current

Original Kenwood Eleven GX Specs:
  
  POWER / PRE AMP SPECIFICATIONS:

Power output: 120 WPC @ 8 Ohms & no more than 0.03% THD w/ 20-20kHz
THD;
<0.03% @ full rated power & 8 Ohms
Freq Response of power amp section;
  5Hz-100,000kHz
Potential power bandwidth power amp section; 5Hz-70,000kHz
Slew Rate; 140V/mSec
Rise Time; 0.95mSec
Damping factor; 60 @ 8Ω / 1kHz
Signal / Noise;  115dB !!! short circuited
Input Sensitivity AUX / Tape; 150mV @ 50kΩ
Input Sensitivity Microphone; 1.50mV @ 10
Graphic EQ Controls;  ±10dB
Low Filter; variable from 18Hz to 200Hz
Hi
Filter; variable from 3kHz to 20kHz
Loudness Control; +10dB @ 100Hz (-30dB VOL)
Output levels / impedance; Tape RCA 150mV / 100 Ohms
DIN 120mV / 80kOhms
 
TUNER SPECS FOR FM;
Tuning Range;
88-108MHz
Freq Response; 30-15kHz (full range limits of FCC)
S/N @ 65dBf; >80db Mono or 74dB Stereo
Capture Ratio @ 65dBf; 1.0 dB
THD Mono @ 1kHz; 0.1%
THD Stereo @ 1kHz; 0.15%
50dB Quieting Sensitivity; 14.7 dBf / 3.0μV Mono
37.2 dBf / 40μV Mono
FM Alternate Channel Selectivity; 75dB @ 400Hz
Spurious Noise Ratio; 85dB
IF Response Ratio; 75dB
Image Response Ratio; 60dB
AM Suppression; 65dB
Stereo Separation; 48dB @ 1k & 35dB @ 50-15kHz
Subcarrier Product Suppression; 46dB


TUNER SPECS FOR AM;
Tuning Range; AM Band ~530 kHz-~1700 kHz
S/N; 
>50db
Useable Sensitivity (IHF Bar Antenna); 20μV
Selectivity; 30dB @ 1kHz
IF rejection; 55dB @ 1kHz
AM tuner THD; 0.5%
 
  PHONO SECTION SPECS;
Freq Response;
30Hz-20kHz w/ RIAA deviation; ±0.3dB
S/N; >80dB & 2.5mV
Input Sensitivity; 2.5mV @ 50kΩ
Overload limit; 250mV @ 1k w/ 0.03% THD

 
Again, we have completely gone through this Pioneer SX-939 Stereo Receiver, as stated above and 'certified' it's 'Ready To Go'! This is a HUGE / 'Monster' receiver from the late 1970's! It's in great shape with only minor issues. There are minor scuffs / striations on the dial window (have to 'angle' room light to notice them), a couple of small scratches near the 'Spkr C / Power switch', a small 'tic' on the top from edge of the wood case, and a small veneer chip on the lower right corner. All else not noticeable or worth mentioning (see photos above for details). All original, milled, aluminum knobs intact with no loose, bent or wobbly shafts. Everything moves with exact precision. It is an AMAZING looking receiver when lit up in a darkened room. The unit looks fabulous, works and sounds great! Includes a pdf, 'e' copy, download of the Kenwood KR-11000GX service manual. Receiver measures 24.5" wide x 18.25" deep x 8.5" high and weighs 47 lbs unpacked. Includes our standard 90 day limited warranty.
KENWOOD ELEVEN GX STEREO RECEIVER
Cond. 8.5

SOLD 5/24/16
SHIPPING TO INDIANA

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


 

 

               

 

NEW PHOTOS JUST POSTED!!!

NEW LISTING 12/29/15
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE PIONEER STEREO RECEIVER
THE PIONEER SX-9000
W/ "REAL" ANALOG SPRING REVERB!

 #...8112
  
"WORLD AC POWER" ™
  Circa 1971-73
 MIJ
SOLD 1/23/16
SHIPPING TO CALIFORNIA

 
Our technician has completely gone through and 'Certified' this unit, cleaning everything including all switches, controls and contacts for quiet, positive operation. Output transistor / driver Bias current set to spec. 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 and this one had definitely drifted. Pulls stations great now. We also REBUILT the almost always 'frozen' 'FM Signal Strength' meter on this one (not an easy task, and requires donor meters of the same series). All dial, meter, Reverb, FM Stereo & FM Function indicator lamps replaced and balance of lamps checked for trouble-free service. All inputs tested and both side produces clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. Following restoration procedures, the unit was ran 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.
 
  
While this unit was originally rated at 50 wpc, on our test bench, both this unit's (#...8112) amplifiers produce 21.6 volts  per channel for 58+ watts per channel @ 8 Ω via discrete output & 18 volts per channel for 81 watts per channel (17% MORE POWER than the last SX-9000 we had) @ 4 Ω via discrete, Sankyo, Metal cased, (TO-3) outputs.
 (AC draw at idle 300 mA tested
Floor noise measured at L= 1.1 mVAC and R= 1.0 mVAC)

 ____________________________

 

 So, it's been a while since we've had a Pioneer SX-9000 receiver (six years to be exact), and I forgot how impressive sounding this model was (actually I don't think I spent as much time with the previous 2 or 3 to realize even close to it's performance potential). While they are a bit 'daunting' to get the hang of all the controls, once you get used to the 'dash board' they are a pleasure to use, are incredibly 'musical' sounding, and very responsive. One of the best 'sounding' features I've found on this particular unit, is the 'Master / Source' volume control. It acts like a separate power-amp / pre-amp set-up. You use the 'Master' to 'open up' the power amp section, then control the input with the 'Source' level (yes, I know power-amps are always 'opened-up' by nature, but for some reason this design seems to impart stronger than normal punch, depth, dimension, and 'musicality' to the overall sonics of this receiver. The built-in Analog real Spring Reverb also helps with most source material (not too much, just use about 20% for best typical results) (yes, I know most recordings have 'all the reverb' they need in the mix (I'm a 35+ year veteran musician), but the added reverb adds a very pleasing amount of depth and dimension to most recordings). Classic looking brushed-aluminum silver face and encased in a real wood Walnut veneer cabinet that is in pretty much, NEW condition

Pioneer SX-9000 Features Include:
 
- Weighted flywheel analog tuning
- Real Analog Spring Reverb built-in (True stereo internal spring tank)
- Separate "Master / Source' level controls (only stereo receiver we're aware of that offers this feature)
- Separate Bass and Treble
- "Tone Color" (overall tone level)
- Loudness control
- Reverb On / Level control
- Tone color control w/ illuminated 'curve' display
- A-B-C-Off speaker selector (Max 2 pair at a time)
- Hi filter for reducing the 19kHz pilot tone in FM and tape hiss / electronic hiss & noise and record static
- Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables
- FM muting, separate from FM stereo / mono selector
- Dual tape monitors (tape B uses DIN I/O's on rear or 1/4" phono, TRS jacks on front panel) (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / MP3 / XM / SIRUS etc. and Dubbing can be used with CDR (CD recorders) units)
- Stereo / Mono / Stereo Reverse / RT Input / LT input or R+L Mono combined mode selector
- Dual Phono / Turntable inputs
- Dual Microphone inputs with separate On / Level controls to allow mic signal to be mixed with program source signal at the same time (be careful with your speakers if you're going to utilize this feature).
- Dual AUX inputs (CD / DVD /DAT / iPod / VCR / MP3 / XM / SIRUS etc. inputs)
- Pre-out / Main-in loop (with Inter-couple switch eliminates need for jumpers)
- Dual, analog tuning VU meters
- "Back-Lit" Reverb level indicator window
- Center Channel Out (way ahead of it's time)
- Rear mounted RCA Center channel output
- Built-in AM Ferrite, "Stick" Antenna
- Rear located, full barrier strip for external antenna connections
- 2 AC convenience outlets (1 switched - 1 un-switched)
- Rear mounted Main AC lines fuse
- Rear mounted speaker output protection fuses
-True "WORLD AC POWER" ™  allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 volts AC input.

 
PIONEER SX-9000 SPECIFICATIONS:

POWER / PRE AMP

THD: 0.500% at full rated power
Freq Response of power amp section at full rated power: 20-20,000Hz
Bandwidth of power amp section at 1w: 10-35,000Hz
Damping factor: 100 @ 8Ω full bandwidth
Rated Power: 50 wpc @ 8 ohms
 
TUNER SPECS FOR FM:
S/N Stereo: > 70db
S/N Mono: > 65db
Mono Sensitivity: 9.3 dBf
Mono Sensitivity: 1.6 μV
Capture Ratio: 1.0dB
De-Emphasis: 75 μs
THD Mono: 0.50%
THD Stereo: 0.80%
IF rejection: 95dB
FM separation: 40dB
 
 PHONO SECTION SPECS:

S/N: 80 dB, ref w/ 10mV input
Sensitivity: 2.5 mV w/ overload @ 100mV

 
 Again, we have completely gone through this receiver.  All functions tested for perfect operation. It looks NEW, including the Walnut case, Brushed Aluminum face and matching knobs.  Even the front "flip-down" panel springs intact and work great (many are broken). The the unit looks, performs and sounds great! True to most Pioneers, after we refurbish them, this unit has a VERY GOOD TUNER! AM reception above EXCEPTIONAL, FM reception incredible and IMPECCABLY CLEAN!!! Again, the 'Master / Source' volume control design adds a lot to the sonics, as well as the additional EQ of the 'Tone Color' circuit, as well as the Analog Spring Reverb. Lots of punch and headroom. We'll include one pair of Pioneers, proprietary speaker output plugs and a DIN to RCA cable for the second tape monitor.
Includes a pdf / 'e-copy' download of the Sansui G-9000 Owners-Users / Service manual. Measures 20.5" wide x 14" deep x 7.75" high and weighs 36 lbs unpacked. Includes our standard 90 day limited warranty!
 PIONEER SX-9000 STEREO RECEIVER
 Cond. 8.5-9

(C) R.R. 
SOLD 1/23/16
SHIPPING TO CALIFORNIA


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


 

 

         

NEW LISTING 12/8/15
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE-CLASSIC SANSUI STEREO RECEIVER
SANSUI G-9000 STEREO RECEIVER (North American G-901)
 CIRCA 1979
WORLD AC POWER"
 MIJ
SOLD 12/29/15
SHIPPING TO MAINE

Our technician has completely gone through and 'Certified' this unit, cleaning everything including all switches, controls and contacts for quiet, positive operation.
Extra attention is ALWAYS necessary on Sansui units to the 'Input Selector'  and 'Tape Monitor' switches, and they were thoroughly cleaned and tested (one great thing about the "G" series, over it's predecessor series, the 990/9090 and 8080, is that the input selector contacts are not also conducting the 'dial lamps', so a common intermittent dial lamp issue with those units is averted on the G-9000).
He also re-flowed all dial lamp solder joints, especially at the 'extremes' of the board. ALL NEW dial lamps light solidly and inputs sonically intact. DC measurements taken 'post-preamp', 'post driver board' and 'post power amp'. Bias current set to spec. Green 'LED' Power indicator's 'current limiting' circuit components tested. We also aligned the tuner dial indicator and tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. All dial, all meter (including the very difficult to replace power meter lamps), all function indicator and stereo indicator lamps replaced with new units for years of trouble-free service.  Mechanical volume preset disassembled, cleaned and re-lubed. Once the unit's electronics were addressed, it was cosmetically detailed inside and out. All original, extruded face, and milled aluminum knobs in great shape after detailing. Internal and external dial screen and window in perfect shape. All inputs tested, including both phonos, and both amplifiers produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. Only cosmetic issues are minor, ie; a small tic in the upper, left corner of the face plate, and some minor scuffs on the sides (see above photos). The real Walnut wood veneer in good condition with only very minor wear. Following restoration procedures, the unit was operated continuously at medium volume, as all our amplifier / receivers are, into a load with ""Loudness"" on and both Tone Controls at 10 for 72 hours.

On our test bench, this particular Sansui G-9000, #...0492, amplifiers each produced 38 volts per channel for 180 watts per channel @ 8 Ω via discrete output & 35 volts per channel for 306 watts per channel @ 4 Ω via discrete, Metal cased, original TO-3 outputs.
 (AC draw at idle 623mA tested,
DC offset adjusted to 0mV each side.
Floor noise measured at L=00.0mVAC and R=00.0mVAC)
  ___________________________
 

  
  Here's the first Sansui G-9000 we've ever had! We've had a couple of '8000's', but never a "9000". What a beautiful piece. I happen to think this series was the most impressive looking receivers ever built by any manufacturer. The controls have the highest quality 'feel' about them. Massive 'sculpted' knobs, milled from solid aluminum (the later series looked like this, but had knobs that were aluminum 'caps' over plastic bases). The front end is the same as the massive and famous (and VERY expensive) Sansui G-22,000 and G-33,000. These are known for great tuners, and amp's that you can "darn near weld with". The tuner quality on both AM & FM is exceptional.
The amps are incredibly warm sounding with HUGE punch and headroom. Very "Musical" sounding with real output transistors and huge power supplies. A testament to the strength of the power supply is that the results we achieved on the test bench (see above test results). Most receivers will have from 20-40% more power at 4 Ohms than they do at 8 Ohms. This is primarily due to power supply limitations. However, the Sansui G-9000 at 4 Ohms is almost double what the receiver's amplifiers are are rated at for 8 Ohms!!!
The difference in tone of a 'G' series, with a 'clean bill of health', and most other receivers is astronomical. Sort of like the difference between driving a 130hp car and a 400hp car or a 350cc bike and and 1100cc Harley. It's a difference that must be experienced to be appreciated.

Sansui G-9000 Features include:

 

- Super-Heavy, Weighted analog flywheel tuning with fully lit "Slide Rule" dial
- 3 band de-featable EQ featuring high quality de-tented pots
- Tone Defeat selector for purest tone path
- Selectable 'Turnover' points for Bass and Treble Controls
- A, B, A+B, & OFF speaker set selector
- Dual Tape monitors (plus 4-Ch / NR Adaptor can be used as an additional 'loop' if needed)
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / 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) (2 offers both RCA & DIN I/O's)
- Bi-Directional Tape dubbing
- AUX Input (may also be used for Video / CD / DVD / VCR / iPod / DAT / MP3 / XM / SIRUS etc.)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Dual Phono / Turntable inputs
- -20dB Instant Audio Muting
- Dolby FM de-emphasis
- 4 channel / NR adaptor inputs and outputs
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- MPX filter for reducing the 19kHz pilot tone and 38kHz harmonic in FM broadcasts
- Built-in "Low" / Subsonic Filter to eliminate excess rumble from sources such as turntables
- FM muting, separate from FM stereo / mono selector
- IF band width selector for filtering radio stations that are 'close' in spectrum
- Stereo / Mono mode selector for Pre-Amp section
- Dual Analog, VU Power Meters
- Analog, VU style, Tuning and signal strength meters
- Mechanical volume limiter
- Front mounted 1/4" Microphone jack
- Pre-out / Power amp input
- Microphone Level / Mixing control (be very careful with your speakers when using this function)
- Front mounted 1/4" stereo headphone jack
- Side mounted I/O jacks for both RCA's and Speaker outs
- Triple-AC outlets on rear panel (1 switched & 2 un-switched) with a total capacity of 400 watts.
- True
“WORLD AC POWER" as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts AC

Sansui G-9000 Original Specs:
  
"The G-9000 has a continuous power output of 160 watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.03% THD (measured utilizing AUX input)"
 
POWER / PRE AMP SPECIFICATIONS:
THD;
0.03% @ full rated power
Potential Freq Response of Pre-amp section;
measured @ 1w; 5-50,000Hz +0.2dB / -1.5dB  ±
Potential Freq Response of power amp section;
Potential frequency response of power amp section DC-200KHz & @ 1w; +0dB / -3.0dB  ±
 IMD utilizing AUX;
 0.03% @ full rated power / 20-20kHz
Slew Rate; 76 V / μ-sec
Damping factor; 60 @ 8Ω & full bandwidth
Hum and Noise;
  95dB @ AUX / Tape
Input Sensitivity AUX / Tape; 150mV @ 47kΩ
Tape 1/2 Output level, via RCA; 150mV
Tape 2 Output level, via DIN I/O; 43mV
 PreOutput level; 1.0 V
Stereo / Channel Separation @ 1kHz; 70dB
Bass Control;  ±10dB @ 50hz
Bass Turnover;  200hz or 400hz
 Mid Control;  ±5dB @ 1.5khz
Treble Control;  ±10dB @ 10khz
Treble Turnover;  1.5khz or 3khz

Low Filter;  -3dB @ 16Hz @ 6dB Oct
High Filter;  -3dB @ 3kHz @ 6dB Oct
"Loudness" Contour;  +8dB @ 50hz, +6dB @ 10khz (w/ volume set at -30dB)

 
SANSUI G-9000 TUNER SPECS FOR FM (most tuner specs are improved over it's smaller sibling, the Sansui G-8000);
Tuning Range;
88-108mHz
Freq Response;
30-15kHz
S/N @ 65dBf; > 80db Stereo
S/N @ 65dBf; > 76db Mono
Useable Mono Sensitivity; 8.7 dBf (1.5μV)
Useable Stereo Sensitivity; 15.0 dBf
Capture Ratio; 0.9dB
Image Response Ratio; 110dB
Spurious Noise Ratio; 110dB
IF Response Ratio; 110dB
Signal for 50dB quieting, Mono; 12.5dBf
Signal for 50dB quieting, Stereo; 34.0dBf
THD 65dBf @ 1kHz, Mono;  0.06%
THD 65dBf @ 1kHz, Stereo;  0.8%
Stereo Separation @ 100Hz; 40dB
Stereo Separation @ 1kHz; 50dB
Stereo Separation @ 10kHz; 40dB
FM Alternate Channel Selectivity; 90dB @ 400 Hz

TUNER SPECS FOR AM;
Tuning Range;
530-1600kHz
S/N;
 > 50db
Useable Sensitivity; 300μV / m with ferrite stick antenna or 50dB / m with external antenna
Selectivity; 30dB
Distortion: 0.45%

PHONO SECTION SPECS;
Freq Response;
20-20kHz

 S/N;
78 dB, ref w/ 5mV input
THD;
0.03% @ 240 mV @ 1kHz
Stereo / Channel Separation @ 1kHz; 70dB
Input Sensitivity;
2.5 mV @ 47kΩ
Overload limit;
240 mV @ 1kHz


Again, as stated before, we have completely gone through this unit cleaning, refurbishing and testing all. This is an incredible sounding receiver in all aspects. Due to it's huge power output
(again, we were able to get a 'shade' over 300 watts per channel, into a 4 Ohm load), even at very low volumes it sound's like a "Class-A" amplifier. The controls are very "musical" sounding, especially the tone control circuit. Also, the reception on both the AM and FM tuning bands are excellent, and the AM is exceptional for a stereo receiver. For the majority of folks, exceptional AM would be inconsequential, but if it is important to you, like it is to me, this becomes an all-around, very usable receiver and a pleasure to use. Again, only cosmetic issues are minor, ie; a small tic in the upper, left corner of the face plate, and some minor scuffs on the sides (see above photos). Beautiful aluminum face, with it's beveled dial glass and all original, milled knobs in fabulous shape. Wood grain, vinyl wrapped case in fine shape as well. Unit looks great and sounds HUGE! This is truly one of the original "BIG BOYS"! This thing is incredible when lit up at night or in a dark room!! Includes a pdf / 'e-copy' download of the Sansui G-9000 Service manual. Measures 22.2" wide x 8" tall x 19.5" deep and weighs and heavy 60 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI G-9000 / G-901 STEREO RECEIVER
Cond. 8.5+

SOLD 12/29/15
SHIPPING TO MAINE

M.R. (C)


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

 

 

             

NEW LISTING 12/23/15
 (Click on above thumbnails to enlarge photos)
 
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE STEREO RECEIVER
TECHNICS SA-700A / SA-700

#...A004
CIRCA 1979-81

WORLD AC POWER"
 MIJ

SOLD 1/13/16
SHIPPING TO WISCONSIN

Our technician has completely gone through and 'Certified' this unit, cleaning everything including all switches, controls and contacts for quiet, positive operation. All I/O and 'control' solder joints inspected and
re-flowed as necessary. ALL NEW dial lamps light solidly and inputs sonically intact. DC measurements taken 'post-preamp', 'post driver board' and 'post power amp'. Bias current set to spec. We also aligned the tuner dial indicator and tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. Once the unit's electronics were addressed, it was cosmetically detailed inside and out. All original, extruded face, and milled aluminum knobs in great shape after detailing. Internal and external dial screen and window in perfect shape. All inputs tested and both amplifiers produces clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. Only cosmetic issues are minor, ie; a small ding in the upper, front edge of the wood case, and some minor scuffs on the sides (see above photos). The real vinyl wood veneer in great condition with no peeling. Following restoration procedures, the unit was operated continuously at medium volume, as all our amplifier / receivers are, into a load with ""Loudness"" on and both Tone Controls at 10 for 72 hours.
    
 
While this unit was originally rated at 90 wpc, on our test bench, this particular unit's (#A004) amplifiers produced peak power of 32.5 volts per channel at 8 ohms for 132 watts per channel & 27.5 volts at 4 ohms for 189 watts per channel via discrete, TO-3, metal-cased output devices. (4x 2SD427 4x 2SB557). Bias current and DC offset set to spec. AC idle current measured at .35A. Floor noise measured at 00.6mVAC R & 00.2mVAC L.
  ____________________________
  
This is the first "A" / Euro-Asia version of this receiver we've had (at least in 18 years), the Technics SA-700A. Elegant looking receiver. Lot's of power via discrete output devices (not power packs!). This series always has above average tuners especially if you want to listen to AM and great output. As most folks realize, even the best Stereo Receivers do not have much AM performance. Technic's "SA" series receivers generally have exceptional AM tuner quality. This is the "bigger brother" to the receiver we use on our main test bench and have for years. We have abused ours to no end and it keeps on going. With the exception of a couple of small dings on the cabinet edges, it in near NEW condition (see photos above.

Technics SA-700A Features include:

  
- Weighted flywheel analog "slide-rule" tuning
- Classic Brushed Aluminum finish face panel
- Main & Remote speaker selectors
- Oversized volume control featuring high quality de-tented pot
- Separate Bass, Mid & Treble controls utilizing high quality de-tented pots
- Pre-Amp out / Power Amp in loop
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- FM Muting / Mono selector
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Built-in Low / Subsonic Filter to eliminate excess rumble from sources such as turntables
- Hi & Lo Boost controls
- Phono / turntable input
- AUX Input (may also be used for Video / CD / DVD / VCR / DAT / MP3 / XM / SIRUS etc.)
- Dual Tape monitors (inputs / outputs) with Bi-Directional Dubbing capability
 (Tape Monitors can be used with Video / CD / DVD / iPod / VCR / DAT / MP3 / XM / SIRUS etc.)
- RCA and DIN I/O's on Tape 1
- Dual 12-segment, Multi-Color LED power meters with switch-able range @ either x1 or x0.1
- 4 Channel MPX RCA output
- AM stereo Output
- Overload and DC short protection built-in
- Dual, Analog VU meters for signal strength & tuning
- Front mounted 1/4" stereo headphone jack
- Externally located, Built in AM 'Stick' antenna for exceptional AM performance
- Dual, externally located speaker / output protection fuses
- Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched totaling 300 watts capacity

- True
“WORLD AC POWER" as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts AC

  
TECHNICS SA-700 / SA-700A SPECIFICATIONS
:
THD: 0.04% @ full rated power
Damping Factor: 50
Freq Response: of power amp section @ full rated power; 20-20,000Hz
Rated Power: 100 wpc @ 8 ohms
Phono S/N: 95dB (A-weighted w/ 5mV ref signal). Minimum
2.5mV

TUNER SPECS FOR FM;
S/N: >73dB Stereo
Mono IHF Sensitivity; 10.3 dBf
Capture Ratio:1.0 dB
Mono signal strength for 50-dB quieting; 13.2 dBf
Stereo signal strength for 50-dB quieting;  36.2 dBf
THD, 100% modulation @ 1kHz, Mono / Stereo or Stereo only; 0.1% / 0.2%
FM Selectivity: 80dB

 
As previously stated, we have completely serviced and tested this unit. It is also a "power-house" @ 189 watts per channel! Again we have completely gone through this receiver. It looks, performs and sounds great! Again, with the exception of a couple of 'dings', the wood grained vinyl case in great condition (see above photos). Face and knobs in near NEW cosmetic condition. Receiver measures 21.75" wide x 15.5" deep x 6.5" high and weighs 42 lbs unpacked. Includes our standard 90 day limited warranty.
Technics SA-700A Stereo Receiver

Cond. 8.5

(C) R.R.

SOLD 1/13/16
SHIPPING TO WISCONSIN


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



 

 

 

 

    

NEW LISTING
12/28/15
  (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE SANSUI STEREO RECEIVER
SANSUI 5050 RECEIVER

 #...1831 
 circa 1977-79
 MIJ

SOLD 1/11/16
SHIPPING TO WISCONSIN

Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all switches, controls, contacts and the tuning capacitor. We also aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. All dial, meter, function indicator and stereo indicator lamps replaced with new units for trouble-free service. Amplifier section had output bias and DC offset adjusted to spec levels. All inputs tested, including phono. Both amplifiers produce clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! The Walnut wood grain, vinyl wrapped cabinet has numerous, battle scars, but is structurally fine. Following restoration procedures, the unit was operated continuously at medium volume, as all our amplifier / receivers are, into a load with ""Loudness"" on and both Tone Controls at 10 for 72 hours.
  
On our test bench, both amplifiers on this unit, #...1831, each produced peak power of 17.75 Volts per channel for a VERY STRONG AND PUNCHY sounding 39 watts per channel at 8 ohms & 15 Volts per channel for 56 watts per channel at 4 ohms via discrete, TO-66 metal cased outputs. (2x 2SC1445 & 2x 2SA765)
 AC Idle current at .25A, floor noise <0.1mvAC L&R.

  ____________________________
  
This is only the forth Sansui 5050 we have had in 18 years. These are known for great tuners, and  very warm sounding amps, with lots of punch and headroom. Very "Musical" sounding  with real output transistors and well designed power supplies. 
  Sansui 5050 Features include:

-Weighted flywheel analog tuning
- Large internal Power Supply
- Real Metal Cased output transistors for lot's of punch and tone!!!!
- A, B, A+B & Off speaker selector
- Gorgeous "Aqua" back-lit slide rule face and tuning meters
- Analog Tuning and signal strength VU meters
- Separate Bass, Midrange and Treble controls utilizing high quality de-tented pots
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- FM Muting Selector
- Stereo / Mono selector for all inputs
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Phono / turntable input
- Tape monitor (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / iPhone / iTouch / iGadget / MP3 / XM® / SIRUS® etc.) Tape has both RCA & DIN jacks
 - AUX Input (may also be used for Video / CD / DVD / VCR / DAT / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.)
- Dolby Loop for utilizing external Dolby FM decoding adaptor on FM (no longer utilized for modern FM transmissions)
- 1/4", stereo headphone jack
- Microphone input with Level Control (turns the unit into the ultimate Karaoke Machine (be very careful with your speakers when inserting a mic into a stereo receiver)
- 2x AC convenience outlets 1 switched and 1 un-switched with a total output capacity of 250 watts

  
SANSUI 5050 STEREO RECEIVER SPECIFICATIONS:
 
  POWER / PRE AMP SPECIFICATIONS:
  THD;
0.5% @ 1k / full rated power
  Freq Response of power amp section;
  @ full rated power 20-20kHz
  Music Power rating;
30wpc @ 8Ω

 
  TUNER SPECS FOR FM;
  Freq Response;
30-15kHz
  Capture Ratio; 2.2dB
  S/N ; 
> 65db Mono / > 60db Stereo
   Useable Mono Sensitivity (IHF) ;
2.0 μV / 11.2 dBf
   Mono Signal Strength for 50dB quieting (IHF) ;
3.5 μV / 16.0 dBf
 Stereo Signal Strength for 50dB quieting (IHF);
38 dBf
  THD Mono @ 1kz;
0.4%
  THD Stereo @ 1kHz; 
0.5%
  FM Alternate Channel Selectivity;
60dB
 
  PHONO SECTION SPECS;
  Freq Response;
20-20kHz
  S/N;
>70 dB, A-weighted
   Input Sensitivity;
2.5 mV @ 47kΩ
  Overload limit;
160mV
 

Again, as stated before, we have completely gone through this Sansui 5050, stereo receiver, cleaning and testing all and it gets our full 'Certification'.
This is a great receiver to build a small to medium-large vintage hi-fi system around. It is a pleasure to operate, and was 'fun' to audition. Controls have a great 'feel' to them, and the unit is very 'musical' sounding. Tone controls are very 'responsive' sonically. Overall looks, works and sounds great! This thing is incredible when lit up at night or in a dark room!! Measures 18.25" wide x 6.5" tall x 13" deep and weighs 24 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI 5050 STEREO RECEIVER
Cond. 8.5

(C) R.R.
SOLD 1/11/16
SHIPPING TO WISCONSIN


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

 

  


We've moved the "SOLD / ARCHIVED" items to their own page.
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**
"(actual as measured)" refers to original test results done by Hirsch-Houck Laboratories upon test release of product when new. Current "aged" specifications / performance may of course vary from that.

 

 


 


 

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