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

FULLY SERVICED / RESTORED W/ WARRANTY*
VINTAGE STEREO RECEIVERS
SERVICED / RESTORED CLASSICS 


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


 

(*UNLESS OTHERWISE LISTED)
 

SERVICED / REFURBISHED / RESTORED
CLASSIC STEREO RECEIVERS. . .
ONLY
"BIG BOYS" THIS ROUND  
 

 

   

          NEW LISTING 10/30/20
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE REALISTIC STEREO RECEIVER
 REALISTIC  STA-2000 / STA2000
"BIG POWER OUTPUT!"
200W+/Channel

Orig Cat #31-2075
#...3278
CIRCA 1978
SOLD 1/25/2021
SHIPPING TO BILL IN MASSACHUSETTS


ü Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots.

ü Amp has been cleaned inside and out. All internal control pots and switches are super quality.

ü All 6 Internal fuses checked for continuity and correct values. No issues found, fortunately. We don't like seeing incorrect fuses having been installed in a unit as that could mean it had prior issues, or if a fuse value was 'increased' it could have allowed too much current through an 'ailing' circuit causing un-due / un-necessary damage.

ü Replaced electrolytic capacitors (13 in all) on power supply board

ü DC offset adjusted to VERY LOW levels on either amplifier (check results below).

ü Bias set to spec @ 17.5mVDC across emitter resistors. Nice, even sine waves to both rails up to 26.5VAC.

ü All Dial / Meter  / function / stereo indicator lamps (eleven in all) replaced for trouble free service.

ü We also aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. The tuner works exceptionally well in our warehouse. Picks up both AM and FM bands way above average!!!

ü 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. 

ü Plexi, Dial window removed and had scuffs / scratches removed

ü Entire unit cosmetically detailed in and out

ü Real, Walnut wood veneer side panels had fresh coat of Lemon oil and look fine.
      
 
While this unit was originally rated at 75 Wpc, on our test bench, this particular unit, #...3278's amplifiers produced 26.5 Volts per channel at 8 Ohms for 87 Watts per channel & 30 Volts at 4 Ohms for 225 Watts per channel via discrete, TO-3, metal-cased output devices. (NEC 2SB539A & 2SD287A) DC adjusted down to <3mV L&R. AC idle current draw .3A. Floor noise measured at <-60dBm.
    ____________________________
    
Up to 1978, this was the pinnacle of Realistic's offerings. The STA-2000. This one also features an exceptional tuner.

The Realistic STA-2000 is internally built with all the attention to detail and quality you hope to get in a 'vintage, Japanese-built' stereo amp. The, TO-3, Metal Cased output transistors are mounted in a large, heat-sink array, vertically oriented with ventilation located directly above and below. To back up the power output transistors is a HUGE power supply transformer,


(taken prior to bench work, thus the 'dust')

with giant 63V / 15,000 uF Filter capacitors. Also, the capacitors are NOT mounted to a circuit board, but are 'clamped' to the metal chassis and then connected via "point-to-point" wiring. All of the rotary potentiometers are quality, 'FULL SIZE' and are NOT mounted to a circuit board, but fastened to the metal chassis and then connected via "point-to-point" wiring (means that when you put pressure on a knob, you're not directly 'flexing / fatiguing' solder joints on the 'main circuit board' {YES, that happens and is commonly an issue with most gear}). High heat resistors 'stand proud' of the circuit boards, to keep avoid 'heat damage'. Speaker connector terminals are mounted separately (not to the 'main board'), are anchored completely to the rear chassis metal, with their own cb that is 'point-to-point' wired to the main circuit board. The RCA I/O jacks are mounted similarly. The benefit of that is that every time you connect / disconnect a Tape deck, Turntable, CD, DVD, MP-3 player, DAT, iPhone / Android or any other device to the unit, you aren't 'flexing / fatiguing' solder joints on the 'main circuit board'. 7-Gang tuning capacitor, has full shielding to reduce RFI with adjustment markings.
Of course, like most 'good' audio, it's circuit boards are built / populated with 'old school, discrete and 'full size' parts (capacitors, diodes, resistors and transistors) with NO, 'Low Wattage / Low current', 'SMD' components.

All the pots, controls and construction quality in general is way above average! It's built like a "brick $h17 house"
 
Realistic STA-2000 Features include:

- Discrete output transistors, featuring Metal Cased, TO-3 devices (best, most expensive way to build an amp)
- 7-Gang Tuning capacitor

- 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 w/ built-in phono pre-amp
- -20dB Audio Muting
-  Dual AUX Inputs ((may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®, external mixing board, etc.)
)
- Dual Tape monitors with Bi-Directional Dubbing capability ("Tape-1" features both RCA and DIN I/O's)
   
 (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
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 typical / standard "bare wire" push clips and redundant RCA type
 - Externally located main AC protection fuse as well as 5 internally located protection fuses for sub-systems
- Dual AC convenience outlets on rear panel with 1 switched and  un-switched totaling 200 Watts capacity

    
Realistic STA-2000 Original Specs:

Frequency Response: 15Hz to 20kHz ± 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;
2.2mV @ 50kΩ
Overload limit;
230mV
  
TUNER SPECS FOR FM;
Freq Response;
30-15kHz
S/N; > 70db Stereo
Mono Sensitivity; 1.7μV
Capture Ratio; 1.5dB
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

SOLD 1/25/2021
SHIPPING TO BILL IN MASSACHUSETTS

 (C) R.R.
 
 

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

 

         

        NEW LISTING 10/30/20
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED

VINTAGE TECHNICS STEREO RECEIVER
TECHNICS SA-5560
"BIG POWER OUTPUT!"
100W+/Channel

 #....B090
Circa 1976-80
MIJ
for sale


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

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

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

ü Speaker protection fuses replaced with higher quality units

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

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

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

ü All dial, indicator & meter lamps 'proactively' replaced w/ modified #DE3021 x3

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

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

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

On our test bench, this particular Technics SA-5560, #...B090 amplifiers each produced 29 Volts per channel for 105 Watts per channel @ 8 Ω via discrete output & 25 Volts per channel for 156 Watts per channel @ 8Ω via discrete, TO3 Metal Cased outputs (2 each 2SA747A and 2SC1116A)
AC Idle current at 500mA, DC offset output adjusted to <20 mVDC either channel. Bias correctly adjusted to 12mVDC across emitters. Floor noise measured at >-60dBm w/ AUX shorted.)
   ___________________________

   
Impressive & huge Technics SA-5560 Silver-face receiver. It's not only loaded with features, but it's a 'POWER HOUSE'!

This receiver's amplifier was designed and built around probably the MOST PROVEN output transistor compliment in 'Classic Hi-Fi History', generally consisting of two each; "2SA747A" and "2SC1116A", TO3, Metal cased outputs. This unit is in with some impressive 'company' as these are the same outputs used in such famous and classic receivers / amplifiers as; Kenwood KR-8050, Kenwood KR-9400, Kenwood KR-10000 III, Kenwood KR-Nine G, Kenwood Eleven-III, Onkyo TX-4500-II, Pioneer  QX-949 / 949A, Pioneer SX-838, Pioneer SX-1010, Sansui 5000X, Sansui 8080, / 8080DB, Sansui 9090 / 9090DB, Sansui AU-710, Sansui AU-717, Sansui AU-11000, Sansui BA-5000, Sansui G-701 / G-7000, Sony STR-7065, Technics SA-5570, Technics SE-9600, Yamaha B-1, Yamaha CR-1000 to name a few!!!

The Technics SA-5560 is internally built with all the attention to detail and quality you hope to get in a 'vintage, Japanese-built' stereo amp. Besides just 'having' the above mentioned output transistors, they're mounted in a MASSIVE, heat-sink array, vertically oriented with ventilation located directly above and below. To back up the power output transistors is a HUGE power supply transformer,


(taken prior to bench work, thus the 'dust')

with giant 63V / 15,000 uF Filter capacitors. All of the rotary potentiometers are quality, 'FULL SIZE'. High heat resistors 'stand proud' of the circuit boards, to keep avoid 'heat damage'. Speaker connector terminals are mounted separately (not to the 'main board'), are anchored completely to the rear chassis metal, with their own cb that is 'point-to-point' wired to the main circuit board. The RCA I/O jacks are mounted similarly. The benefit of that is that every time you connect / disconnect a Tape deck, Turntable, CD, DVD, MP-3 player, DAT, iPhone / Android or any other device to the unit, you aren't 'flexing / fatiguing' solder joints on the 'main circuit board'.
Of course, like most 'good' audio, it's circuit boards are built / populated with 'old school, discrete and 'full size' parts (capacitors, diodes, resistors and transistors) with NO, 'Low Wattage / Low current', 'SMD' components.

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

Technics SA-5560 Features include:
    

- Weighted flywheel, analog, 'Slide-Rule' tuning
- "Main", "Remote", or "Main+Remote", or "OFF" speaker positions
- Quality, De-Tented Bass and Treble control potentiometers

- Volume control with super quality de-tented pot
- Loudness control for increasing 'rock-n-roll smile' tone curve at lower volumes
- Built-in Hi (Scratch) and Sub filters for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss, AM hiss and the Sub filter for reducing turntable rumble and feedback.
- "Hi-Blend" for FM ('blends' L&R down to a certain frequency. Useful when you have a 'distant' / weak channel the seems 'noisy' or 'flits' between Stereo / Mono)

- FM muting (separate from Stereo / Mono selector)
- Stereo / Mono ("MODE") selector (separate from FM muting selector)
- Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)
- Two 'True' Tape Monitors (either One or Two at once)
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)

- Phono / Turntable inputs with built-in phono pre-amp
- Front mounted 1/4" stereo headphone jack

- Dual Analog /
'd'Arsonval' meters for tuning and signal strength
- 'DC Surge' speaker protection relay for ON/OFF sequence
- Externally located Speaker Output / Amplifier protection fuses
- Rear located, full barrier strip for external antenna connections
- Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 300 Watts of accessories

Technics SA-5560 Original Specifications:


POWER / PRE AMP SPECIFICATIONS:
THD;
<0.1% @ full rated power @ 20Hz-20kHz. (0.05% @ Half Power)
Power bandwidth of power amp section; 10Hz-40,000Hz -3dB
 IMD utilizing AUX; <0.1% @ full rated power
Damping factor; 55 @ 8Ω full bandwidth (= 'tight bass' response)
Cont rated Power (while not exceeding 0.1% THD):

2x 90 Watts @ 4 Ohms (Both channels driven 20Hz-20,000Hz)
2x 85 Watts @ 8 Ohms (Both channels driven 20Hz-20,000Hz)
2x 108 Watts @ 4 Ohms (Both channels driven 1kHz)
2x 93 Watts @ 8 Ohms (Both channels driven 1kHz)
S/N; >95dB on AUX / Tape
Input Sensitivity AUX / Tape @ 1kHz for rated output; 150mV @ 35
Record Out Levels; 180mV
Bass Control;  ±13dB @ 50hz
Treble Control;  ±12dB @ 10khz
Low Filter; 100Hz @ 6dB Oct
High Filter;  7kHz @ 6dB Oct
"Loudness" Contour;  +9dB @ 50hz, +8dB @ 10khz (w/ volume set at -30dB)


TUNER SPECS FOR FM:
Tuning Range;
88-108MHz
Freq Response;
20-15kHz (limited to 15kHz by FCC)
S/N; > 72db Stereo w/ 1mV input
> 75db Mono w/ 1mV input
Mono Sensitivity; 1.8μV
Capture Ratio; 1.5dB
IF Rejection; >80dB @ 98MHz
Image Rejection; >53dB @ 98MHz
IF / Spurious Noise Ratio; >80dB @ 98MHz
Selectivity; >70dB
THD w/ 100% modulation Mono; 0.15%
THD w/ 100% modulation Stereo; 0.25%
Stereo Separation; >45dB @ 1kHz

TUNER SPECS FOR AM:
Tuning Range;
525-1605kHz
Useable Sensitivity; 260uV/m with ferrite stick antenna
Image Rejection; >47dB/m @ 1kHz
IF Rejection; >40dB/m @ 1kHz
Selectivity; 22dB @ 1kHz

PHONO SECTION SPECS:
Freq Response;
RIAA Standard Curve +/- 0.2dB

S/N for "IHF-A" weighting;
>78 dB!!!
Input Sensitivity Phono-1;
2.5 mV @ 47

Overload limit; 150mV

Max Power consumption;
270 Watts (not including anything powered through 'Convenience Outlets')

 

Again, as stated before, we have completely gone through this Technics SA-5560 Stereo Receiver, cleaning and testing all and it gets our full
'Certification'. Other than the above mentioned scuffs / smudges to the upper face plate, the unit is in fine cosmetic condition! Again, tons of power as we  bench tested at over 100WPC! Functions, performs and sounds great! Measures 19.75" wide x 6" tall x 16.5" deep and weighs 36 lbs unpacked. Includes our standard 90 day limited warranty.
TECHNICS SA-5560 STEREO RECEIVER
Cond. 8.5

$989.

(CONS. R.R.)


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

 

 

 

    

         NEW LISTING 10/30/20
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
PRE-APPRECIATED CARVER STEREO RECEIVER
CLASSIC CARVER "THE RECEIVER" / MXR-6250
BIG POWER @ 125 Watts!

with Carver's "MAGNETIC FIELD
" POWER AMP
#...2460

Circa 198
9-90
M.I.J.
SOLD 1/12/2021
SHIPPING TO TIM IN ARIZONA


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

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

ü Mains selector correct @ 120V AC

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

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

ü Corrected tuner settings for North American frequencies, thus clearing up tuner 'hum / noise' and allowing it to register 'correct' frequencies.

ü DC offset adjusted to LOW levels on either amplifier.

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

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

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 48 hours.

 
ü On our test bench, the internal amplifiers of this Carver MXR-6250 receiver, #...2460 produced 38 Volts per channel @ 8 Ohms with 1Khz input for 180 Watts and 30 Volts per channel @ 4 Ohms with 1Khz input for 225 Watts via discrete,output transistors (2x Toshiba 2SA1302 & 2x 2SC3281).

ü Bias adjusted to correct spec

ü DC offset output adjusted and measured down to < 10 mV DC either channel.

ü Floor noise measured @ >-60dBm AC either channel.
 

According to the Orion Blue Book, this is
the last of the classic, Carver receivers. Modernized by digital tuning and fluorescent display. This is a 'POWER HOUSE' and can power medium to large systems. LOADED with inputs as well as listed below. These are very well built units employing Carver's Unique Magnetic Field Amplifier design. Inside features a double shielded power transformer to reduce noise and ALPS brand pots, switches and contacts throughout. Multiple, very high quality, 5% tolerance resistors throughout...



Real, discrete output transistors, mounted on super efficient, vertically finned, thin-walled heat-sink....



Speaker outputs are protected by internal automatically resetting relays and output section is thermal protected.
Last of the units in Carver's 'Classic Pewter' finish before they switched to 'black'. Has matching Rack Handles intact. Looks fabulous!!!

Carver MXR-6250
Features include:
 

- Digital tuning with 6 AM & FM presets
- Circuit Boards populated with 'REAL' components (NOT anemic SMD components)
- True, Discrete Amplifier Outputs (NOT STK chips / Darlington packs)

- Sonic Holography Built-In (this was one of Bob Carvers, 'Signature' patents and were expensive when purchase separately. I sold them when new in the 1980's)

- Auto / Manual tuning modes
- A, B, A+B and 'Off' speaker selector
- Fluorescent and LED displays for digital station readouts, Tuning signal strength, Tuning, Station Presets and dual Power / Watt output meters
- 'Stereo / Mono' selector on Pre-amp

- 'Subtle' "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.

 - Separate Bass, Mid and Treble controls (ie; 3-band EQ)
- FM Multi-Path Noise Filter

- Dual TRUE tape monitors (Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Bi-Directional Tape 'Dubbing' capability

- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)
- Additional, Dual "AUDIO" inputs (called "VIDEO") (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)
- Actual Video Input, VCR-2 I/O for 'video' signal, and TV / VIDEO output

-  Phono / Turntable input with Built-In Phono Pre-Amp
- ¼" stereo headphone jack

- 4 AC convenience outlets (2x switched 350W /  2x un-switched 350W)

Carver MXR-6250 Original Specs:

POWER / PRE AMP SPECIFICATIONS:
THD;
0.05% @ full rated power
Cont rated Power: 2x 125 Watts @ 8 Ohms / 20-20kHz

Hum and Noise; >90dB on AUX / Tape
Input Sensitivity AUX / Tape; ~150mV @ 50kΩ
Record Out Levels; ~150mV
Bass Control; ±8dB @ 100hz
Midrange Control; ±6dB @ 1khz
Treble Control; ±8dB @ 10khz
"Loudness" Contour;  approx; +6dB @ 100hz, +3dB @ 10khz (w/ volume set at -40dB)


TUNER SPECS FOR FM:
Tuning Range;
~88-108MHz
Freq Response;
6Hz-15kHz (limited by FCC)
S/N @ 85 dBf; > 78db Stereo
50dB Quieting Sensitivity;
Mono...18.3dBf (4.0 μV)
Stereo...17dBf (4.5
μV)
Capture Ratio; <1.5dB
Alternate Channel Selectivity @ 98mHz (±400kHz); >72dB
IF Rejection; >85dB
Image Rejection; >42dB
THD @ 65dBf Mono @ 1kHz0.2%
THD @ 65dBf Stereo @ 1kHz0.1%
Stereo Separation; >46dB
@ 1kHz
AM Suppression; 62dB


TUNER SPECS FOR AM:
Useable Sensitivity IHF;
500 uV/m with ferrite stick antenna
Image Rejection; >65dB
IF Rejection; >60dB
Selectivity; >20dB
THD; <0.4%


PHONO SECTION SPECS:
Freq Response;
20-20kHz RIAA Standard Curve +/- 0.2dB

S/N on MM;
>90dB
Input Sensitivity MM;
2.5 mV @ 50kΩ
Input Capacitance in PF;
150
 Overload limit; 100mV
 

This is a very elegant, versatile and great performing receiver. Again, as stated above, we have completely gone through this unit,  and it performs, sounds and looks great! Overall, this is an impressive and VERY powerful unit. Versatile and easy to use. Last of Carver's, 'Pewter' Receivers before they switched to 'Black' anodized.
Measures 19" wide x 5.5" tall x 18.2" deep and weighs 30 lbs un-packe
d. Includes a 90 day limited warranty.

CARVER "THE RECEIVER" MXR-6250
Cond. 8.5+

SOLD 1/12/2021
SHIPPING TO TIM IN ARIZONA

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

 

 

 

         

NEW LISTING 1/14/2021

  (Click on above thumbnails to enlarge photos) 
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED & WARRANTED
VINTAGE STEREO RECEIVER
YAMAHA CR-220 / CR220 STEREO RECEIVER 
#...1669
circa 1977-'79
MIJ!
for sale

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

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

ü Internal fuses checked for continuity and correct values.

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

ü Tuner string checked for any fraying then re-tensioned to increase traction & relieve flywheel binding

ü We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years and re-centered pointer to correct dial position.

ü Both dial indicator & meter lamps have been recently replaced.

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

ü Amplifier section had output bias adjusted to service manual spec levels of on both amplifiers (33mVDC ±3mV).

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

ü DC offset adjusted to LOW levels on all four amplifiers (less than 7mVDC).

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.
Total restoration time investment 5 hours.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
 
ü On our test bench, this particular Yamaha CR-220, #...1669, amplifiers each produced 12+ Volts per channel for 18 Watts per channel @ 8Ω via discrete output & 10+ Volts per channel for 25 Watts per channel @ 4Ω via discrete transistors; 2x 2SA771 & 2x 2SK1986.
ü AC draw at idle .22A.
ü DC <7mV either channel.
ü Floor noise measured at >-60dBm / 0.1mVAC
 ___________________________

   
From the original "CR-X20" series that produced ALL the classic receivers from Yamaha! This is from the series that was capped by the most sought after Yamaha receivers (just the other end) the TOPL CR-3020. This is the entry into that line, the Yamaha CR-220. Same Beautiful brushed solid aluminum front panel with analog, slide rule tuning dial, just less (much less) power. All original, Milled, Aluminum Yamaha knobs intact and in near new condition. This is the first one of this model we've had in 24+ years of having the website. Great receiver for 'small-medium', office, project studio or bedroom system.

Yamaha CR-220 Features:
   

- Discrete output transistors
- Weighted flywheel analog AM/FM slide-rule tuning with lighted dial pointer
- Separate Bass & Treble EQ with super quality de-tented controls
- Features Yamaha's own "Variable Loudness Contour" control utilizing high quality de-tented potentiometer 
- Analog 'd'Arsonval' meter for FM tuning and AM signal strength
- FM Muting / Mono selector
- Stereo / Mono selector for entire pre-amp section (separate from FM selector)
- LED Stereo indicators
- Speaker selector for A - B, A+B, or Off
- 'True' Tape Monitor ("True" Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc) Most Yamaha receivers did not offer "true" Tape Monitors (not just a "Tape Input" on a selector). In fact, I don't remember any that did other than this one.
- Phono input with built-in Pre-Amp
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS®  etc.)
- 1/4" Stereo Headphone Jack
- Rear located, full barrier strip for external antenna connections
- Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 400 Watts of accessories

  
Original Yamaha CR-220 Specifications:

POWER SPECIFICATIONS:

Power Output;
The Yamaha CR-220 has a continuous RMS power output of 15 Watts per channel min. @ 8 Ohms from 20 hertz to 20,000 hertz with no more than 0.25% THD (measured utilizing AUX input)
THD; 0.25% @ 15W, 20-20kHz
Signal / Noise; 96dB
Potential power bandwidth power amp section; 10-40,000Hz
Damping factor; 40 @ 8Ω / 1kHz

PRE AMP SPECIFICATIONS:
Signal / Noise; >96dB @ AUX / Tape
Input Sensitivity AUX / Tape; 120mV @ 47
Record Out Terminals (RCA); 120mV @ 1
Bass Control; ±14dB / -10dB @ 20Hz
Bass Control Turnover; 350Hz
Treble Control; ±12dB / -10dB @ 20kHz
Treble Control Turnover; 3.5kHz
Loudness Control; Variable
 
TUNER SPECS FOR FM;
Tuning Range;
88-108MHz
Freq Response;
50-10kHz ±0.5dB
30-15kHz ±1dB

Useable Mono Sensitivity / Quieting Characteristics (for 50 dB S/N); 4μV / 17.3dBf
Useable Stereo Sensitivity / Quieting Characteristics (for 50 dB S/N); 50μV / 38.3Bf

S/N @ 65dBf; > 70dB Mono or 65dB Stereo
Capture Ratio @ 65dBf; 1.5dB
THD Mono @ 1kHz; 0.2%
THD Stereo @ 1kHz; 0.3%
Alt Channel Selectivity; 60dB @ 400kHz
Spurious Noise Ratio; 75dB
Image Response Ratio; 50dB
IF Response Ratio; 75dB
AM Suppression ratio; 52dB
Useable Mono Sensitivity / Quieting Characteristics (for 50 dB S/N); 4μV / 17.3dBf
Useable Stereo Sensitivity / Quieting Characteristics (for 50 dB S/N); 50μV / 38.3Bf
Muting Threshold; 5μV / 19.2dBf
Stereo Separation @ 1Hz; 40dB

TUNER SPECS FOR AM;
Tuning Range;
525-1605kHz
S/N @ 80dB / m; >50dB
Useable Sensitivity (IHF Bar Antenna); 18uV/mV
Selectivity; 20dB @ 1kHz
THD; 0.6% @ 80dB / m
Image Response Ratio; 40dB @ 1kHz
Spurious Rejection; 40dB @ 1kHz
 
PHONO SECTION SPECS;
Freq Response;
RIAA deviation; ±0.5dB
S/N MM; >90dB, (for 10mV output / Shorted inputs)
Input Sensitivity MM; 2mV @ 47kΩ
THD MM to Rec Out; 0.05% for 120mV output
Overload limit MM; 110mV @ 1k

 
Again, we have completely gone through this Yamaha CR-220 Stereo Receiver, as stated above and, it's
'certified' and 'Ready To Go'!
Cosmetically, the only issue worth mentioning is that someone scratched in their id info on the rear panel (see photos above). The brushed Aluminum face and knobs are in LIKE NEW condition. The unit looks fabulous, works and sounds great! Includes a pdf, 'e' copy, download of the Yamaha CR-220 owners / users / instruction manual. Receiver measures 17.2" wide x 12.85" deep x 5.75" high and weighs a heavy,
17 lbs unpacked. Includes our standard 90 day limited warranty.
YAMAHA CR-220 STEREO RECEIVER
Cond. 8.5+

$369.
 

(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.

 

 

 

 




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', '9 3/4.1' or '8.BR549' A/V receivers? (Part 2)

Cont from Part 1 of; “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',
'9 3/4.1' or '8.BR549' A/V receivers?” (excerpts ‘paraphrased’ from …
So, just as importantly as the ‘technical aspects’ mentioned in “Part 1”, it’s ALL ABOUT THE MONEY, and we consumers want things as ‘cheaply as possible’, right…? Yes, we do, otherwise the market place wouldn’t be flooded with ‘cheeeeeeeeeeeeeeeeeeese’ from China (and from any of the other sources that can ‘make it as cheaply as possible). You say, “hold on a just gohl-darn minuite”, it’s the manufacturers fault, they’re the ones making things so ‘CHEAP’. NO, it’s not their fault. They are simply following consumer demands (who vote with their dollars, by continually spending as little as possible over the past generation++) and have no choice (at least in ‘mainstream goods’) but to produce and supply goods for as little ‘end user cost’ as possible,…”The Race to the Bottom”. Sure, we consumers give ‘lip service’ to terms like “high quality” and “good service”, but in the end, as a whole, we go for the cheapest options (one of the reasons service companies ‘outsource’ customer service to India, is that they can’t afford to pay ‘domestic labor rates’. Why not? Because we consumers want our phone / cable / insurance or whatever as ‘cheaply as possible, and we aren’t willing to pay for any better). Hey, I’ve been guilty of it a few times myself, but have learned the hard way (fortunately fairly early on)  to try and avoid that method of acquiring items and / or choosing service providers.
So, historically stereo manufacturers had to be concerned, primarily with ‘paying themselves’ in the end, when they designed / built / produced something. When mfgs start out to design an item for market, they are usually ‘backing into it’ from a projected retail / end user price point (that was not necessarily as applicable ‘back in the day’, which is how we ended up with ‘monster receivers’ such as the Marantz 2500 & 2600, Pioneer SX-1980, Sansui G-22,000 and G-33,000, Yamaha CR-3020 and a couple of others that escape me). There are many costs associated with bringing an item / model to market and getting it to the point where it can actually be purchased by an end user / consumer. These costs are similar no matter what the item, ie; stereo gear, clothes, tools, food, services, raw materials, or any item or ‘widget’. Some ‘added cost’ items have generally remained a constant as a percentage of the overall final price of an item, over the years, such as ‘raw materials’, payroll, capitol investments, packaging, transportation / shipping etc. However, in recent years, especially where ‘stereo receivers’ are concerned, manufacturers have been adding more and more features. Most of these “features” have little to do with improving the ‘REAL’ sound quality of the unit, and more to do with compatibility with extraneous aspects. We play DVD’s thru them that are encoded with ‘Dolby’, ‘THX’, ‘dbx’, 'DVD', ‘Lucas Sound’, ‘Blu-Ray’, etc. and inputs that mention things like “iPhone”, “Android”, “iPod”, “Apple”, etc. All of those things are ‘licensed’ from their respective trademark owners. Not to mention all of those manufacturers are constantly making changes (they tend to like to call them ‘upgrades’) to their products, which means that any mfg utilizing or including that ‘3rd party’ product as a feature in their product must now employ their engineers to modify their designs to ‘play well with others’. Those licenses cost money, and those costs take away from money that could be available to invest in the ‘sonic quality’ of the stereo unit.
Sonic quality is a sum of many parts, but a few are ‘discrete’ output transistors, instead of ‘chip’ outputs. ‘Metal-Cased / TO-3’ output transistors, instead of simply ‘epoxy-cased’ transistors. Larger power transformers, and larger storage capacitors to both make sure you have the available current to do the output transformers justice, and the ‘storage capacity’ to make sure you have enough power in reserve to produce deep, rich bass notes. Other aspects that add overall quality to a unit are the caliber of the switches, controls, contacts, semiconductors and components, shielding around sensitive circuits, internal wiring quality and connector / connections quality etc. Is the unit designed with ‘full size’ potentiometers, secured to the chassis with metal ‘shaft nuts’, or is it designed utilizing very ‘small body’ (read, “anemic”) potentiometers, with their control shafts simply protruding thru a hole in the front and secured only by their solder joints (which means that every time you touch / manipulate a control, you are ‘flexing / stressing’ the solder joints and circuit board). The same goes for the I/O jacks on the back panel. Throughout the unit, most
modern (most of what has been built in the past 25-30 or so years) electronics are built utilizing ‘SMD’ technology (look it up). While ‘SMD’ tech facilitates automated assembly processes (read, “robots”), keeps weight down (means lower handling and shipping costs), utilizes smaller individual components (again, ‘cheaper’ parts), SMD doesn’t generally lend to the improvement of ‘sonic qualities’. In-fact, it is probably THE BIGGEST CONTRIBUTOR to degraded, ‘analog’ audio quality. It’s great for things like calculators, computers, smart phones, appliances, automotive control devices etc (unless any of those units are expected to sound good). However, better ‘audio quality’ requires ‘better current’ (Amperes / Amps). Better current is generally best handled by traditional, ‘full size’ electronic components (the stuff designed, starting from about the 1920 thru the 1960’s, and generally peaking in designs released about 1977-79...at least as far as consumer hi-fi goes). Components such as ‘real transistors’ (or tubes if you’re so inclined), full size, electrolytic capacitors (bigger is generally better for storage, and that’s one of the main jobs of capacitors), ‘full size’ resistors to handle all that current without ‘melting down’ or going ‘up in smoke’, etc. The main reason that modern gear is able to attempt to accomplish the same tasks (and more) than vintage gear is that they convert the signal from analog to digital on the front end, and only at the ‘last minute’ convert it back to analog at the back end. That comes back to the generation plus old arguments of analog vs digital.
And the beat goes on…


 

 

 

 

Jerry Gahagan, of Oak Tree Enterprises, LLC standing in front of one of a few 'batches' of speakers put together for an 'upper Mid-West' Micro-Brew chain.

 


Did you know?

MCS was marketed in the US, by JCPenney's in the 1970's and '80's and has generally proved to be solidly designed and built gear in the long run (not so much gear past early 1980's). Most MCS (Modular Component Systems) equipment was built by either Matsushita (parent company of Panasonic (founded 1918) and Technics (introduced 1965) or NEC (established 1898-99, originally known as Nippon Electric Company). Both VERY well respected, electronics industry giants. Most of the MCS stereo receivers and amplifiers prove to be fine performers once 'Certified' by a qualified technician. There are a few 'exceptions' and when we encounter one, they don't even make it to the bench, but then, most brands, including Pioneer, Marantz, Sansui, Kenwood, Sony & Yamaha made a handful of 'exceptionally cheaply designed and built' models that we won't bother to refurbish / restore. When I sold either Technics or Panasonic gear new, I knew there was a VERY low chance of that unit coming back with an issue, over many of the other brands I might have had at my disposal. Needless to say, I am a fan of most gear built by Technics / Panasonic and have seen enough of it to know that if I had to place a 'blind-bet' on an 'as-found' unit either being in 'functioning condition' or being close to it, gear built by Matsushita (NEC as well) will be a 'safe bet'.

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


 

 

 


A COUPLE OF 'AS-IS' RECEIVERS.
NORMALLY WE DON'T OFFER UP 'AS-IS' UNITS, BUT WE HAVE LIMITED TECH TIME, AND AS THESE ARE A COUPLE OF FAIRLY 'HIGH PROFILE' / SOUGHT-AFTER RECEIVERS...
 

         

      NEW LISTING 7/23/19
(Click on above thumbnails to enlarge photos)
VINTAGE & BEAUTIFUL FISHER STEREO RECEIVER
THE CLASSIC FISHER 800-T (SAME AS 500-T EXCEPT ALSO HAS AM)
Circa 1969
#...2638
MADE IN USA

AS-IS - "AUTOSCAN" FUNCTION DOES NOT SEEM TO WORK
SOLD 1/22/2021
SHIPPING TO DAVID IN FLORIDA


ü Our technician has gone through this unit to a point

ü All Dial, Meter, Stereo Indicator and 'Beacon' lamps work currently

ü Noisy pots / controls cleaned to facilitate 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 Bias current adjusted to correct levels.

ü DC offset adjusted to super low levels.

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

ü Tuner 'Station Indicator / pointer' should be aligned.

ü Controls and pots should be further cleaned

ü As a 'side note', ALL the original, brushed, anodized, aluminum 'Knob Brites' intact!

ü Entire unit cleaned cosmetically inside and out (but not detailed). Receiver looks good

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 basic bench check 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!

ü On our test bench, the internal amplifiers of this Fisher 800T receiver, #...2638 produced 21 Volts per channel @ 8 Ohms with 1Khz input for 55 Watts and 14 Volts per channel @ 4 Ohms with 1Khz input for 49 Watts via discrete, TO-3, metal cased, Motorola outputs (2x Motorola TR1038-5 & 2x TR1039-5).
ü AC Idle current at 300mA
ü Bias adjusted to correct spec
ü DC offset output adjusted down to 1.5mV DC either channel.
ü Floor noise @ < 2.4mVAC either channel.
   ____________________________


This is a very sought after model, we just don't have the tech resources to pursue the 'Auto-Scan' function, thus didn't invest more time into it on much of it's other aspects as well (however, even if it was working, it's a fairly 'useless' feature (we have a 450T that it does work on. Also, there are Youtube videos that demonstrate it's limited effectiveness even when functioning correctly).
This is the first Fisher 800T we've had in almost 24 years of having the website. We've had it here a few years, but just now decided to sell it with the 'Auto-Scan' not appearing to work correctly.
Cosmetically the unit is in overall great condition for being ~45 years old. Again, we really have only done a cursory cosmetic service. Unit looks good works great and sounds great! Includes an 'e' copy / pdf download of the original Fisher 500T (again, same unit without AM) owners / users / instruction manual, and brochure. Measures 17.5" wide x 14" deep x 6" high and weighs a
HEAVY 35
lbs unpacked.
Fisher 800T STEREO RECEIVER
Cosm Cond. 8+
As-Is
(CONS. R.R.)
SOLD 1/22/2021
SHIPPING TO DAVID IN FLORIDA


(Any additional service / restoration work may be undertaken at any time and will be reflected in an adjustment in price.)

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

 



 

    

      NEW LISTING 7/23/19
(Click on above thumbnails to enlarge photos)
VINTAGE FISHER STEREO RECEIVER
THE CLASSIC FISHER 450-T
W/ "AUTOSCAN ELECTRONIC TUNING"

Circa 1969
#...3328
MADE IN USA

for sale

AS-IS - One channel not producing as much "Bass / Fullness of tone" as the other channel.

ü Our technician has gone through this unit to a point

ü Most Dial, Meter, Stereo Indicator lamps work currently (one dial lamp out)

ü Noisy pots / controls cleaned to facilitate service

ü Electrolytic power supply filter capacitors tested for leakage

ü A number of electrolytic capacitors changed in the 'audio path', but that made no difference in the tone (no, we didn't do all of them)

ü All 4 power transistors removed, tested for leakage (we actually switched sides to see if that made a difference in tone)

ü DC offset adjusted to low levels.

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

ü Entire unit cleaned cosmetically inside and out (but not detailed). Receiver looks good

ü One channel not producing as much "Bass / Fullness of tone" as the other channel. On the scope, there's noise on the left channel at around 300Hz, which is likely related to the lack of bass.?...

ü Missing one rubber foot (we didn't pursue due to diminished tone)

ü As a 'side note', ALL the original, brushed, anodized, aluminum 'Knob Brites' intact!

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 basic bench check 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!

ü On our test bench, the internal amplifiers of this Fisher 450T receiver, #...3328 produced 21 Volts per channel @ 8 Ohms with 1Khz input for 55 Watts and 15 Volts per channel @ 4 Ohms with 1Khz input for 56 Watts via discrete, TO-3, metal cased, Motorola outputs (2x Motorola 1060 & 2x 2060).
ü AC Idle current at 220 mA
ü Bias adjusted to correct speck
ü DC offset output adjusted down to <10 mV DC either channel.
ü Floor noise @ < 0.1mVAC either channel.
   ____________________________


This is a very sought after model, but unfortunately it is lacking 'low end' response on one side. We pursued it for a few hours, but had 'bigger fish to fry' and we just don't have the tech resources to pursue it further (You can actually get both channels to sound similar by increasing the bass on one, and decreasing the bass on the other (it has separate L & R Tone controls) ) .
The 'Auto-Scan' function does work.

This is the first Fisher 450T we've had in almost 24 years of having the website. We've had it here a few years, but just now decided to sell it with one channel lacking as much bass as the other.
Cosmetically the unit is in overall great condition for being ~45 years old. Again, we really have only done a cursory cosmetic service. Unit looks good works great and sounds great! Includes an 'e' copy / pdf download of the original Fisher 450 owners / users / instruction manual. Measures 15.5" wide x 14.25" deep x 4.5" high and weighs
25 lbs unpacked.
Fisher 450t STEREO RECEIVER
Cosm Cond. 8+
$399. As-Is
(CONS. R.R.)

(Any additional service / restoration work may be undertaken at any time and will be reflected in an adjustment in price.)

(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 .

  

 


 



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', '9 3/4.1' or '8.BR549' A/V receivers? (PART 1)


 
 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...Cont in Part 2 (also on this page)

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 .

  

- - -

 

 



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 10/30/20
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE MARANTZ STEREO RECEIVER
MARANTZ 2250
 #...1178
 Circa 1976-77
 Classic 'Blue Face'
 MIJ

SOLD 10/31/20
SHIPPING TO BOB IN TENNESSEE


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

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

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

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

ü Broken 'Dolby' switch repaired and replacement knob sources

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

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

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

ü Bias adjusted to correct 8mVDC

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

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

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

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

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

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

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

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

ü Full Cosmetic detail inside and out

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

On our test bench, this particular Marantz 2250, #...1178 amplifiers each produced 22 Volts per channel for 60 Watts per channel @ 8 Ω via discrete output & 20 Volts per channel for 100 Watts per channel @ 8Ω via discrete, "MARANTZ" branded (originals) TO3 Metal Cased outputs (4x 2SC1343)
AC Idle current at 350mA, DC offset output adjusted to <1mVDC either channel. Bias correctly adjusted to 8mVDC across emitters. Floor noise measured at >-60dBm w/ AUX shorted.)
   ___________________________

   

Classic 'Blue Face' Marantz, 2250 stereo receiver. Elegant looking Face is milled from a solid plank of Aluminum with matching milled aluminum controls. This unit looks great!

Marantz 2250 Features include:
  

- Marantz exclusive "Gyro-Touch" weighted flywheel analog 'Slide Rule' tuning w/ ''PLL' (Phase Locked Loop) circuitry
- A-B, A+B or Off speaker selector
- Separate 'LEFT AND RIGHT' Bass, Mid and Treble utilizing high quality 'Alps' brand pots
- Tone Defeat for purest signal path (if desired)
- Tone centers selectable for either 100 Hz to 250Hz and 1kHz to 4kHz

- 'Pre-Out' / 'Main-In' loop
 - Built-in Hi filter for reducing 19kHz pilot tone and 38kHz Harmonic in FM broadcasts & Tape hiss.
  - Built-in 'Low' Filter to eliminate excess rumble from sources such as turntables
  - FM muting, separate from FM stereo selector and has adjustable level (on rear panel)
 - Stereo / Mono mode selector for Pre-Amp section or FM tuner (depending on function selected)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound
 - Phono / turntable  input
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
- Real 'Tape Monitor Loop' and second 'Tape Input'
  (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Analog VU 'Tuning' & 'Signal Strength' meter
- Dolby FM selector (Broadcasts aren't in Dolby anymore, but if desired, it still does 'Brighten' up your FM sound. I tend to use it when it's an option on tuners)
- Fully shielded tuning capacitor
- Built-In AM 'Stick' antenna
- Antenna attenuator
- 'Quadradial' RCA tuner output (not of much use today)
- 1/4" Stereo Headphone Jack
 - Externally located protection line fuse and additional internal protection fuse bank
- Separated L & R output heat sink sections featuring large, vertically finned heat sinks
 - Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 300 Watts of accessories

  
 Marantz 2250 Stereo Receiver Original Specs:
   "The Marantz 2245 has a continuous power output of 50 Watts per channel @ 8 from 20 hertz to 20,000 hertz with no more than 0.3% THD (measured utilizing AUX input)"
Comparable 'Music' power = 135 Watts
  
POWER / PRE AMP SPECIFICATIONS:
THD:
<
0.3% @ 8Ω @ full rated power
Freq Response of power amp section;
 @ full rated power 20-20kHz
Dynamic Range;
96dB
IMD utilizing AUX;
0.25% @
Damping factor: >55 @ 8Ω full bandwidth (FYI; twice the damping factor of it's 'little brother' the 2220)
 Input Sensitivity: 180mV for output of 50 Watts @ 8 Ohms
Main Power-Amp in: 1.5V for output of 50 Watts @ 8 Ohms
Input Impedance AUX or Tape: 100k Ohms
S/N AUX:
85dB
Record Out Levels; 180mV
Bass Control;  ±10dB @ 100hz
Mid Control;  ±7.5dB @ 700hz
Treble Control;  ±10dB @ 10khz
Low Filter; 100Hz @ 6dB Oct
High Filter;  7kHz @ 6dB Oct
"Loudness" Contour;  +9dB @ 50hz, +8dB @ 10khz (w/ volume set at -30dB)
 
TUNER SPECS FOR FM:
Freq Response:
30-15kHz
Useable Mono RF Sensitivity: 2.5 μV
Capture Ratio: 1.5dB
THD w/ 100% modulation @ 400Hz, Mono:  0.2%
Spurrious Rejection: 95dB
Image Rejection: 70dB
IF Rejection: 90dB
Selectivity60dB
AM Supression55dB
 
 PHONO SECTION SPECS:
Input Sensitivity:
1.8 mV @ 47kΩ
Dynamic Range: 98dB!!!
S/N Phono: 75
dB!!! (typical would be about 68dB)
Overload:
100mV
 
 
 Again, as stated before, we have completely gone through this Marantz 2250 Stereo Receiver cleaning and testing all and it gets our full
certification. Brushed aluminum face and all original, milled knobs in fabulous shape. After restoration, receiver looks, performs and sounds great! This is a VERY 'Musical' sounding tuner/pre/power-amp. Very 'full, warm and phat'. Great 'low-end' depth at any volume. Tone controls have a lot of influence. Overall a pleasing unit to listen to in all aspects. Measures 17.5" wide x 14" deep x 5.5" high and weighs 35 lbs unpacked. Includes our standard 90 day limited warranty!
MARANTZ 2250 STEREO RECEIVER
Cond. 8.5

SOLD 10/31/20
SHIPPING TO BOB IN TENNESSEE

(CONS. R.R.)


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


 

 

   





       NEW LISTING
6/21/19
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE SANSUI STEREO QUADRAPHONIC / 4-CHANNEL / 2-CHANNEL STEREO RECEIVER
SANSUI QRX-6500 RECEIVER
#...0464
Circa 1973-75
"WORLD AC POWER"
 M.I.J.
SOLD 7/28/2020
SHIPPING TO GREG IN LAS VEGAS


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

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

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

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

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

ü  We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! AM seems to be an 'afterthought' on many stereo receivers and component tuners. The AM is above average for a 'stereo receiver' on this SANSUI QRX-6500. 

ü  Most lamps; dial, Stereo indicator, 2/4 Channel indicator, "Discrete", 2-Channel Aux, 'FM', 'Phono-1', Stereo Decoder & meter lamps 'proactively' replaced for a TOTAL OF 19!!!

ü This unit utilizes 'Mica' output transistor insulators, do no heat sink compound to worry about drying up.

ü Amplifier section had output bias adjusted to spec levels of ~25-30mVDC on all four amplifiers.

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

ü  DC offset adjusted to VERY LOW levels (<10mVDC) on all four amplifiers.

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.
Total restoration time investment 17 hours
.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
 
ü On our test bench, this particular QRX-6500, #...0464, 'FRONT' amplifiers each produced 19.4 Volts per channel for 47 Watts per channel @ 8Ω via discrete output & 16.4 Volts per channel for 66+ Watts per channel @ 4Ω
and
ü REAR' amplifiers each produced 17.5 Volts per channel for 38+ Watts per channel @ 8Ω via discrete output & 15 Volts per channel for 56 Watts per channel @ 4Ω
via discrete, Metal cased, TO-3 outputs.
ü AC draw at idle .4A tested.
ü DC Offset adjusted and measured down to <10mVDC any one channel
ü Floor noise measured at >60dBm / 0.1mVAC
 ___________________________

 

HUGE and VERY IMPRESSIVE looking, Sansui, brushed silver, QUAD receiver, surrounded by handsome, real Walnut wood veneer side plates.  Features gorgeous, back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. 'Heavy' built, machined aluminum knobs and button caps, also make this unit a pleasure to 'feel'. This receiver is a 'blast' to use and listen to.

Sansui QRX-6500 Features include
:
  

- Quadraphonic (sometimes spelled "quadriphonic" or "quadrophonic") / Stereo receiver 
- Weighted flywheel analog tuning
- A, B, C Off or A+B or A+C Front speaker positions
- A, B, Off or A+B Rear speaker positions
- Separate Front and Rear, Bass and Treble controls
- Balance controls allow complete blending between Front and Rear / Left and Right
 - Built-in Hi and Sub filters (separately switchable Front and Rear) for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
- FM Stereo / Mono (separate from 'FM Muting' selector)
- FM muting (separate from 'Stereo' selector)
- Mode Selector (EXTENSIVE SELECTION) for Stereo / Mono / 2-Channel / 4-Channel and more...

- ''Synthesizer / Decoder Function Control' selector for 2-Channel Stereo, & 4-Channel modes of ''QS Synthesizer' (To convert (synthesize) conventional, 2-channel / stereo program sources to 4-Channel stereo output),
Hall; "To enjoy the kind of 'presence' you'd feel if you were seated front and center in a concert hall, theater, or jazz club..."
Surround; "To drown yourself in the middle of the music. The performing artists will surround you, making you feel as if you were participating."

'QS Regular Matrix' (to decode and reproduce 4-channel program sources (records, tapes and their respective broadcasts), 
''Phase Matrix' (to decode and reproduce 4-channel program sources, encoded with the CBS / SQ matrix system)
or
'CD-4 / Discrete' (when wishing to hear discrete 4-channel tapes or CD-4 (Quadradisc) records).
- Aux inputs for both Front and Rear (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)

- Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's for both Front and Rear
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
-  Dual Phono / Turntable inputs with Built-In Phono Pre-Amp, featuring 'Phono-2' compatible with 'CD-4' cartridges

- Separate Front and / or Rear Loudness control for increasing 'rock-n-roll smile' tone curve at lower volumes
- Front and Rear 1/4" stereo headphone jacks for connection of either 'stereo' headphones, or 'quadraphonic / 4-channel' headphones
- Dual Tuning DArsonval meters for tuning and signal strength

 - AM Local / Distant selector on rear panel

- Rear located, full barrier strip for external antenna connections
- Rear located main AC protection fuse
 - 4 Externally mounted speaker protection fuses on rear panel
- Triple AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 250 Watts of accessories
  - True “
WORLD AC POWER"

   as it will work on both 50 or 60 Hz AC and voltages from 110-240 Volts AC


Sansui QRX-6500 Original Specs:

 POWER / PRE AMP SPECIFICATIONS:
THD;
0.5% @ full rated power @ 1kHz.
Power bandwidth of power amp section; 20-30,000Hz ±0dB
 IMD utilizing AUX;
 0.5% @ full rated power / 20-20kHz and 8 Ohms
 Damping factor; 30 @ 8Ω full bandwidth
Dynamic (music) rated Power: 2 x 190 Watts @ 8 Ohms or 280 Watts @ 4 Ohms
Cont rated Power:

4x 33 Watts @ 8 Ohms / 1kHz (ALL channels driven w/ 1kHz input)
4x 37 Watts @ 8 Ohms / 1kHz (each channel driven w/ 1kHz input)

4x 60 Watts @ 4 Ohms / 1kHz (each channel driven w/ 1kHz input)

Hum and Noise; >70dB on AUX / Tape
Input Sensitivity AUX / Tape; 150mV @ 50kΩ
Record Out Levels; 150mV
Bass Control;  ±15dB @ 50hz (most amp tone controls are only +/- 10dB)
Treble Control;  ±15dB @ 20khz (most amp tone controls are only +/- 10dB)
Low Filter;  -10dB @ 50Hz @ 6dB Oct
High Filter;  -10dB @ 10kHz @ 6dB Oct
"Loudness" Contour;  +8dB @ 50hz, +3dB @ 10khz (w/ volume set at -30dB)

TUNER SPECS FOR FM:
Tuning Range;
88-108MHz
Freq Response;
30-15kHz (limited by FCC)
S/N; > 65db Stereo w/ 1mV input
Mono Sensitivity; 1.8 μV
Capture Ratio; 1.5dB
IF Rejection; >100dB
Image Rejection; >100dB
Spurious Noise Ratio; >100dB
Selectivity; >70dB
THD w/ 100% modulation Mono; 0.5%
THD w/ 100% modulation Stereo; 0.8%
Stereo Separation; >35dB

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

PHONO SECTION SPECS:
Freq Response;
30-15kHz RIAA Standard Curve +/- 1dB.

S/N;
>60 dB
Input Sensitivity;
2.5 mV @ 50kΩ
Overload limit;
150mV w/ 0.5% THD @ 1kHz

 Power consumption;
150 Watts at rated
  

Again, as stated before, we have completely gone through this SANSUI QRX-6500 Quad receiver, cleaning and testing all and it gets our full
'Certification'. Everything is in fabulous electrical and cosmetic condition! Looks near new and sounds great! AMAZING looking when lit up at night or in a darkened room! Again, this unit is a 'blast' to use. It just simply 'feels nice'!
Comes with an 'e-copy / PDF download of the SANSUI QRX-6500 owners / users / service manual, and brochure if the purchaser desires. Measures 21.2" wide x 7.25" tall x 14.5" deep and weighs an impressive 49 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI QRX-6500 STEREO RECEIVER
Cond. 8.5+++

SOLD 7/28/2020
SHIPPING TO GREG IN LAS VEGAS

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


 

 

 

    

           NEW LISTING 4/8/2020
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE SANSUI STEREO RECEIVER
SANSUI EIGHT / 8 RECEIVER
#...0198
Circa 1973-75
"WORLD AC POWER"
 M.I.J.
9/14/2020
SHIPPING TO DOUG IN HAWAII


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

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

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

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

ü Tuner string checked for any fraying then re-tensioned to increase traction & relieve flywheel binding and re-centered pointer to correct dial position. As the "Eight" utilizes a complicated 'gear box' that the tuning knob is actually connected to, it feels and operates different than most (occasionally feels like it's 'slipping' but it's not. Seems to slow down when it reaches a station). Not sure what the reason for the "gear box" is for, but that's how it's made)

ü We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! AM seems to be an 'afterthought' on many stereo receivers and component tuners. The AM is above average for a 'stereo receiver' on this SANSUI Eight / 8. 

ü ALL lamps / bulbs replaced; dial, Stereo indicator, Aux, 'FM', 'Phono-1', Phono-2, Tape, & meter lamps 'proactively' replaced trouble-free service!!!

ü Amplifier section had output bias adjusted to spec levels.

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

ü All inputs tested and both side produces clean and even sine waves into 'brick-wall' 8 & 4 Ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine.
Total restoration time investment 18 hours
.

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
 
ü On our test bench, this particular Eight / 8, #...0198, amplifiers each produced 23 Volts per channel for 66 Watts per channel @ 8Ω via discrete output & 19 Volts per channel for 90 Watts per channel @ 4Ω w/ 1kHz in single channel driven mode via discrete, Metal cased, TO-3 outputs (4x Toshiba 2SC1079).
ü AC draw at idle .2A tested.
ü DC Offset adjusted and measured down to <55mVDC either channel
ü Floor noise measured at >60dBm / 0.1mVAC

ü Following restoration procedures, real, walnut wood, veneer case / bonnet rubbed with Howards "Restore-a-Finish", then "Feed-n-Wax". Looks fabulous. Essentially NEW.
 ___________________________

 

VERY IMPRESSIVE looking, Sansui, brushed silver, Stereo receiver, surrounded by handsome, real Walnut wood veneer side plates. Features gorgeous, back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. 'Heavy' built, machined aluminum knobs (all with two set screws) and button caps, also make this unit a pleasure to 'feel'.
 Incredible internal build quality as well. One of the most impressive internal builds of any unit we've seen (think Pioneer SA-8100 and SA-9100).
 This receiver has a very 'musical' pre-amp and power amp. Lot's of punch, headroom and just great 'tone'. Here's a link to a informative page on this model;
https://bb3blog.wordpress.com/2015/01/10/the-sansui-eight-receiver/

Sansui Eight / 8 Features include
:
  

- Serious internal build quality
- Tone Controls are not your typical 'potentiometers'. They are 'wafer switches' utilizing 'fixed resistors' in 3dB increments, thus no 'carbon trace' to need contact cleaner or to wear out!
- Discrete, TO-3, Metal cased output transistors
- Weighted flywheel analog tuning (with added 'gear box' mechanism)
- Dual, separate AM and FM variable capacitors
- Fully shielded FM discriminator circuit board
- Fully shielded amp driver circuit board

- A, B, C, Off or A+B or A+C speaker positions ("C" position used with 'external / electronic' crossovers and separates power amp from "A" speakers. Complicated and you'll likely never use it)
- 3-Band EQ via Separate Midrange and Treble controls
- "Balance Check Switch & Meter". This is an interesting function that allows you to use the 'Tuning Centering' meter to exactly center the power amp output between L & R (the balance control in it's 'centered / 12 O'Clock' position is not necessarily or even generally centered from an 'output' standpoint)
- Stereo / Mono selector (separate from 'FM Muting' selector and overall preamp)
- Stereo 'Reverse' selector (very handy for trouble-shooting speakers and system)
 - Built-in Hi and Sub filters (separately switchable Front and Rear) for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble / 'howling'
- FM Stereo / Mono (separate from 'FM Muting' selector and overall Stereo / Mono for preamp)
- Adjustable Level FM muting
(separate from 'Stereo' selector) (adjustment on rear panel)
- Adjustable Output Level FM & AM allowing 'volume level matching' of other input devices via AUX, Tape or Phono
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®, external mixing board, etc.)

- Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's for both Front and Rear
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Dual Phono / Turntable inputs with Built-In Phono Pre-Amps
Pre-Amp Out / Power-Amp In Loop
- Front 1/4" stereo headphone jack
- Dual Tuning DArsonval meters for tuning and signal strength
- Rear located, full barrier strip for external antenna connections
- Rear located Speaker Output protection fuses
- Rear located main AC protection fuse
- Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 200 Watts of accessories
  - True “
WORLD AC POWER"

   as it will work on both 50 or 60 Hz AC and voltages from 110-240 Volts AC


Sansui Eight / 8 Original Specs:

POWER / PRE AMP SPECIFICATIONS:
THD;
<0.2% @ full rated power @ 1kHz.
Power bandwidth of power amp section; 5Hz-40,000Hz ±0dB
 IMD utilizing AUX; <0.3% @ full rated power
Damping factor; 60 @ 8Ω full bandwidth
Dynamic (music) rated Power: 2 x 160 Watts @ 8 Ohms or 200 Watts @ 4 Ohms
Cont rated Power:

2x 50 Watts @ 8 Ohms (Both channels driven 20Hz-20,000Hz)
2x 55 Watts @ 8 Ohms / 1kHz (Both channels driven w/ 1kHz input)
4x 60 Watts @ 8 Ohms / 1kHz (each channel driven w/ 1kHz input)

4x 80 Watts @ 4 Ohms / 1kHz (each channel driven w/ 1kHz input)
Channel Separation; >60dB on Power Amp
Hum and Noise; >80dB on AUX / Tape
Input Sensitivity AUX / Tape @ 1kHz for rated output; 100mV @ 50kΩ
Record Out Levels; 100mV
Bass Control;  ±15dB @ 50hz (3dB steps)
Midrange Control;  ±15dB @ 1khz (1dB steps)
Treble Control;  ±15dB @ 15khz (3dB steps)
Low Filter;  -10dB @ 50Hz @ 12dB Oct (steep filter)
High Filter;  -10dB @ 15kHz @ 12dB Oct (steep filter)
"Loudness" Contour;  +10dB @ 50hz, +8dB @ 10khz (w/ volume set at -30dB)

TUNER SPECS FOR FM:
Tuning Range;
88-108MHz
Freq Response;
30-12kHz (limited to 15kHz by FCC)
S/N; > 65db Stereo w/ 1mV input
Mono Sensitivity; 1.7 μV
Capture Ratio; 1.5dB
IF Rejection; >100dB @ 98MHz
Image Rejection; >100dB @ 98MHz
Spurious Noise Ratio; >100dB @ 98MHz
Selectivity; >80dB
THD w/ 100% modulation Mono; 0.3%
THD w/ 100% modulation Stereo; 0.5%
Stereo Separation; >35dB @ 400Hz

TUNER SPECS FOR AM:
Tuning Range;
535-1605kHz
Useable Sensitivity; 48db/m with ferrite stick antenna
Image Rejection; >100dB/m @ 1kHz
IF Rejection; >100dB/m @ 1kHz
Selectivity; 30dB @ 1kHz

PHONO SECTION SPECS:
Freq Response;
30-15kHz RIAA Standard Curve +/- 1dB.

S/N;
>50 dB
Input Sensitivity Phono-1;
2.5 mV @ 50kΩ
Input Sensitivity Phono-2;
2.5 mV @ 30kΩ
Overload limit;
300mV w/ 0.2% THD @ 1kHz

 Power consumption;
140 Watts
  

Again, as stated before, we have completely gone through this SANSUI
Eight / 8  Stereo Receiver, cleaning and testing all and it gets our full 'Certification'. Everything is in fabulous electrical and cosmetic condition! Only cosmetic issues worth mentioning are a few dings on the wood case, mostly on the rear, side edges and a slight ding to the 'Tape-Mon' button (see photos above).  Looks NEAR NEW and sounds great! Great looking when lit up at night or in a darkened room! Again, this unit is a 'blast' to use.
So if you read and understand the above mentioned specifications, some that stand out are, "Damping Factor" of >60!, Bass and Treble Controls that are ±15dB instead of the typical 10dB (that's 50% more range!), 'Fixed Resistor' tone controls instead of typical carbon trace pots (that's a huge deal from a quality and longevity standpoint), 300mV phono overload limit still with a decent THD rating, >80dB overall S/N, FM "Stereo Selectivity" >80dB.
Comes with an 'e-copy / PDF download of the SANSUI Eight / 8 Owners manual. Measures 17.6" wide x 5.5" tall x 13" deep and weighs an impressive 36 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI Eight / 8 STEREO RECEIVER
Cond. 8.5+++

9/14/2020
SHIPPING TO DOUG IN HAWAII

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


 


 


 

 

    



       NEW LISTING
6/21/19
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE SANSUI STEREO QUADRAPHONIC / 4-CHANNEL / 2-CHANNEL STEREO RECEIVER

SANSUI QR-4500 RECEIVER
#...0983
Circa 1973-75
"WORLD AC POWER"
M.I.J.
SOLD 9/3/2020
SHIPPING TO MICHAEL IN IDAHO


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

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

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

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

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

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

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

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

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

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

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

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

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

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
 
ü On our test bench, this particular QR-4500, #...0983, 'FRONT and REAR' amplifiers each produced 15.5 Volts per channel for 30 Watts (160 WPC peak) per channel @ 8Ω via discrete output & 13Volts per channel for 42 Watts (240 WPC peak) per channel @ 4Ω via discrete, Metal cased, TO-3 outputs.
ü AC draw at idle .3A tested. DC 10-15mV any single channel.
ü Floor noise measured at >-60dBm / 0.1mVAC
 ___________________________

 
HUGE and VERY IMPRESSIVE looking, Sansui, brushed silver, QUAD receiver, surrounded by handsome, real Walnut wood veneer side plates. This unit has about THE highest 'KPD-Factor' of any we've had in a long time. What's a 'KPD Factor'? You'll find out when you call to order it.
Features gorgeous, back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. 'Heavy' built, machined aluminum knobs and button caps, also make this unit a pleasure to 'feel'. One of the most 'fun' receivers I've used in a long time.

Regarding some of the 'Quad' aspects, from the original Sansui QR-4500 brochure,
"It's exclusive, built-in, 2-4 Synthesizer Encoder helps the QS regular matrix system convert all of your 2-channel / stereo records, tapes and FM stereo broadcasts into more exciting 4-channel sound than ever.  It has 'Phase Matrix' circuitry that takes advantage of Sansui's exclusive front-rear logic to decode all SQ system records too, with superb front-rear separation...And for even greater versatility, the unit comes complete with an extra set of discrete 4-channel inputs, permitting you to connect a 'demodulator' to play "discrete" records".

Sansui QR-4500 Features include:
  

- Quadraphonic (sometimes spelled "quadriphonic" or "quadrophonic") / Stereo receiver 
- Weighted flywheel analog tuning
- A, B, Off or A+B Front and Rear speaker positions (separately)
- Separate Bass and Treble controls (front speakers)
- Balance controls allow complete blending between Front and Rear / Left and Right
 - Built-in Hi and Sub filters (separately switchable Front and Rear) for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
- FM muting to reduce 'hiss' in between stations (most handy for trouble-shooting speakers / drivers and system overall)
- ''Function Control' selector for 2-Channel Stereo, & 4-Channel modes of ''QS Synthesizer' (To convert (synthesize) conventional, 2-channel / stereo program sources to 4-Channel stereo output), 'QS Regular Matrix' (to decode and reproduce 4-channel program sources (records, tapes and their respective broadcasts),  ''Phase Matrix' (to decode and reproduce 4-channel program sources, encoded with the CBS / SQ matrix system) or 'CD-4 / Discrete' (when wishing to hear discrete 4-channel tapes or CD-4 (Quadradisc) records).
- Dual Aux inputs for both Front and Rear (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)

- Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's for both Front and Rear
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
-  Dual Phono / Turntable inputs with Built-In Phono Pre-Amp, featuring 'Phono-2' compatible with 'CD-4' cartridges
- Loudness control for increasing 'rock-n-roll smile' tone curve at lower volumes
- Pre-Out / Power-Amp In loops on rear panel for all amps
- Front and Rear 1/4" stereo headphone jacks for connection of either 'stereo' headphones, or 'quadraphonic / 4-channel' headphones
- Tuning DArsonval meters for signal strength
 - Front mounted Dual 1/4" stereo headphone jacks
 - 4 Externally mounted speaker protection fuses on rear panel
 - 4 Separate sets of speaker output connectors on rear panel

 - AM Local / Distant selector on rear panel

- Rear located, full barrier strip for external antenna connections

 - Built-in AM Ferrite Stick antenna

- Rear located main AC protection fuse
- Triple AC convenience outlets on rear panel with 1 switched and 2 un-switched for a total capacity of 350 Watts of accessories
  - True “
WORLD AC POWER"

   as it will work on both 50 or 60 Hz AC and voltages from 110-240 Volts AC


Sansui QR-4500 Original Specs:

 POWER / PRE AMP SPECIFICATIONS:
THD;
0.5% @ full rated power
Freq Response of power amp section; 30-30kHz @ 1W
Power bandwidth of power amp section; 20-30,000Hz ±0dB
 IMD utilizing AUX;
<0.5% @ full rated power / 20-20kHz and 8 Ohms
Damping factor; >30 @ 8Ω full bandwidth
Dynamic rated Power: 2 x 160 Watts @ 8 Ohms or 240 Watts @ 4 Ohms
Cont rated Power:
4x 38 Watts @ 8 Ohms / 1kHz (each channel driven)
4x 38 Watts @ 4 Ohms / 1kHz (each channel driven)
4x 23 WPC @ 8 Ohms / 1kHz (ALL channels driven)

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


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

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

PHONO SECTION SPECS:
Freq Response;
30-15kHz RIAA Standard Curve +/- 1.5dB.

S/N;
>60 dB
Input Sensitivity;
2.5 mV @ 50kΩ
 Overload limit;
150mV w/ 0.5% THD @ 1kHz
  

Again, as stated before, we have completely gone through this Sansui QR-4500 Quad receiver, cleaning and testing all and it gets our full
'Certification'.
Built using super quality, full size, ALPS brand pots. Everything is in fabulous electrical and cosmetic condition! Looks near new and sounds great! AMAZING looking when lit up at night or in a darkened room! Again, this unit is a 'blast' to use. It just simply 'feels nice'!
INCLUDES ORIGINAL BOX & PACKING!!!
Comes with an 'e-copy / PDF download of the Sansui QR-4500 owners / users manual, and the service manual if the purchaser desires. Measures 20.75" wide x 6.75" tall x 12.5" deep and weighs an impressive 41 lbs unpacked. Includes our standard 90 day limited warranty.
SANSUI QR-4500 STEREO RECEIVER
Cond. 9+++

SOLD 9/3/2020
SHIPPING TO MICHAEL IN IDAHO

(Cons. R.R.)

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

 

 

 

    

          NEW LISTING 1/1/19
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE PANASONIC STEREO RECEIVER / 8-TRACK TAPE
PANASONIC RA-6800
AM/FM STEREO RECEIVER / 8-TRACK DECK

#...0512
Circa 1973-76
MIJ

SOLD 7/23/2020
SHIPPING TO FT COLLINS, CO.


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

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



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

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

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

ü Cracked head mount repaired to allow accurate head azimuth and track alignment (8-track head mounting brackets are cracked about 80% of the time, but you won't know unless you disassemble to the point to allow a visual on it).

ü Main drive belt has been replaced with NEW for trouble free service (#42-480).

ü Replaced bad track indicator lamps, and checked the balance for function

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

ü Program change mechanism and indicator contacts cleaned / burnished and re-lubed for trouble-free program changes. All original program indicator lamps now work fine.

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

ü Head azimuth & track cross-talk adjusted for optimum performance and the best high-frequency response (not normally expected from 8-track cartridge performance) utilizing RCA #356 and 8TSC-101, Aspen 'Deck Tester' and Audio-Tex 30-312 Test / Alignment tapes, a dual trace Oscilloscope and frequency counter.

ü Track alignment adjusted to eliminate 'cross-talk' between tracks and to ensure the best high-frequency response (not normally expected from 8-track cartridge performance) utilizing RCA #356 and 8TSC-101, Aspen 'Deck Tester' and Audio-Tex 30-312 Test / Alignment tapes, a dual trace Oscilloscope and frequency counter as well as our 'best' pre-recorded tapes.  Deck now has clear sounding highs even when using pre-recorded tapes.

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

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

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

ü Following refurbishment, Speed checked with factory test tape to 98.5% accuracy! (meaning in this case, that our 1000Hz test tape plays back at 985Hz on our Freq Counter Meter)

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

ü Record Meters adjusted for 'even' readout and performance

ü Floor noise tested @ -60dBm

ü Since we also burnished the program track light contacts, they all light and are responsive. Unit works and sounds GREAT!

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



ü  We aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! AM seems to be an 'afterthought' on many stereo receivers and component tuners. The AM is above average for a 'stereo receiver' on this Panasonic RA-6800. 

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

ü Stereo indicator lamp replaced (even though original was working)

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

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

ü Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours into a 4 Ohm load.
  
Mechanically the only issue worth mentioning is that that due to a cracked gear, common to about 50% of the 8-tracks out there, the tape counter was 'defeated' and the window is not 'blank'. About the only cosmetic issue worth mentioning is that I'm pretty sure the plexi dial window was less yellow when new.

ü On our test bench, each internal amplifier of this particular unit, #...0512, produced peak power of 15 Volts per channel for 28 Watts per channel @ 8 Ohm and ~12 Volts @ 4 Ohm for 36 Watts per channel @ 1khz. (Dual STK078).
ü AC Idle current at <.3A, & floor noise -60dBm.
ü DC offset checked to <30mVDC / channel (very good for a 'compact' unit).
  ____________________________
  

Wonderful condition, and REALLY GREAT SOUNDING, mid 70's silver face 'Combo' Receiver from Panasonic. It really is surprising in sonics, performance, feel and quality. Great performance for a 'small to mid-sized' 2-Channel audio system. This is the first 'compact' we have 'pass muster' in the past couple decades (I think the last one was about 1998 or 99 and shipped to Germany).
This is an INCREDIBLY ‘Musical’ sounding receiver. Lot's of surprising 'punch' and volume. It's also one of the best sounding 8-track decks we've auditioned (following restoration). Playback of 'quality' tapes is punch, balanced and bright (typically fairly un-common on 8-track decks). Recording is decent as well, but the playback quality is fabulous. Probably one of the top 2 or 3 decks we've ever had for playback sonics.
Yes, I know, it's a 'compact' and not a 'separate component', but it really is that nice!!! Enough power for up to 'medium-large' / 10" woofer speakers.

Panasonic RA-6800 Features:
  
Receiver:
-
Weighted flywheel analog slide rule tuning
- Separate Bass and Treble controls utilizing high quality de-tented pots
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- FM auto/muting and mono selection
- AFC (Auto Frequency Control) locks stations in for 'drift free' reception
- AM noise filter (located on rear panel)

- Dual Analog back lit meters for tape recording level and tuner signal strength
- Phono / Turntable input with Built-In Phono Pre-Amp for both Magnetic or Ceramic / Piezo cartridges
- Separate '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® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / i-gadget / MP3 / XM® / SIRUS®  etc.)

- Microphone Input with 'mixing' function to add voice to music
(be careful with your speakers if using an 'open / live' mic with home-audio speakers)
- A, B, or A+B speaker selector
- Built-in, internal AM ferrite antenna
- Externally located Speaker / Amp protection fuses located on rear panel
- Dual 200 watt convenience AC outlets for a total of 300 Watts capacity

8-Track cartridge features:
- Stereo Playback and Recording 
- Back-lit, analog, Record Level VU level meters
- Separate L & R Input level controls or 'Auto-Level' selector
- LOCKING Fast Forward (very valuable, time / money saving feature if you have a 'media transfer business' or are transferring your own tapes to CD / computer files)
- Auto-Stop
for 'current track selection' for playback or recording (again, very valuable feature if you have a 'media transfer business' or are transferring your own tapes to CD / computer files)
- 'Pause' function
- Power assist Eject
- Single Track Repeat function

- 1/8" microphone inputs mounted on the front panel
- Microphone Input with 'mixing' function to add voice to music recordings on 8-Track
- 1/4" Stereo Headphone jack
- Rear mounted RCA I/O's

Again, we have done the previously stated refurbishment / restoration work (~15+ 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. Overall, it is in great cosmetic condition! Looks and sounds great! Measures 19" wide x 7" tall x 16" deep and weighs 26 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8.5
PANASONIC RA-6800 STEREO / 8-TRACK RECEIVER

SOLD 7/23/2020
SHIPPING TO FT COLLINS, CO.


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

 

 

 

 

   

    

     


         NEW LISTING 11/5/16

  (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE
PIONEER STEREO RECEIVER
PIONEER SX-1980 RECEIVER
PIONEER'S FLAGSHIP
THE 'BIGGEST' 'BADDEST' RECEIVER TO EVER COME OUT OF THE PIONEER FACTORY
HUGE POWER AND SIZE!
340+ Watts PER CHANNEL!!!
"NOT FOR THE 'FAINT OF POCKET-BOOK'
"
#...0723
Circa 1978-79
MIJ

SOLD
SHIPPED TO MONTANA


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 Power Supply circuit board and both driver boards had all of their 'electrolytic capacitors' replaced (a note on this; prior to replacing the capacitors, we 'dialed the unit in perfectly' for DC offset, Bias and clean output sine waves to beyond rated power. After replacing all the Electrolytics on the power supply circuit board and the amplifier driver boards, the unit was again measured to perfect levels. The old capacitors ALL checked fine, so basically we have baggies of about 50, 35 year old capacitors that are in fine shape. Just FYI.)

      

     


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

ü ALL Switches were flooded with cleaner with emphasis especially on the always at issue, switches / controls such as the 'Function' selector, 'Tape Monitors', '-20dB Muting', and 'Tone Bypass'.


ü  Internal fuses checked for correct value / function and replaced where necessary (and there were some 'in-correct' values we found).

ü  World AC Power correctly set for North American current.

ü This unit has a tuner based on the other Pioneer models, with a couple of additional circuits. The additional circuits are the 'Quartz Lock' and the 'Fine Tune', both of which are indicated by LED's near the 'Stereo' LED indicator. These two additional circuits are an issue with SX-1980's we've discovered, and escalating the unit to an outside tech firm, did not improve their function. While the unit's tuner sounds great, it will drift after being left on for a few hours. Could be 2 or could be 24, but it will drift and need a slight 'nudge' on the tuning knob to bring it back into station center. Also, the 'Fine Tune' light is on when the station is slightly 'off center', and not when it's perfectly tuned. Both our senior techs and two outside repair shops, 'senior techs' spent 8-10 hours on these two aspects, with no appreciable improvement. The 4th tech discovered that the unit could be put into a mode which defeated the additional circuits (which when left intact caused a very faint, cyclical noise), so now it functions like the tuner on the Pioneer SX-1280, 1080, 980. Sonically the tuner sounds great, pulls in stations fine, has great side band rejection, and great 'Stereo' sound. Only issue is the above mentioned 'drift' after a few straight hours of running.

ü  We of course 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 bought ALL the remaining AEL-029 dial bulbs from Pioneer a few years ago. These are the original, official 'Stanley 8V' with blue tinting. We purchased a couple dozen and are probably worth their weight in gold. We have not used them on any of our Pioneer restoration, and have been using a fine substitution. We were saving them for a Pioneer SX-1980 to come along. Well, this unit got them. All four dial lamps and meter lamps replaced with ORIGINAL PIONEER AEL-029's. The balance of the light bulbs, including ALL indicator lamps, the dial pointer lamp, Speaker indictors, 'Stereo' indicator, input / function indicators were replaced with new.

ü All 4
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 4 Ohm load with "Loudness" on and both Tone Controls at 10 for 48 hours into a 4 Ohm load. Cosmetically, the top, horizontal edge of the face plate has some light / shallow striations running it's length, there's a scuff on the volume knob, and at some point in it's past, the Walnut, wood 'half bonnet' was re-veneered in a lighter shade of walnut (see photos above). Again, overall this is a fabulous receiver. You won't be disappointed. Total restoration time investment between two senior techs ~38 hours.  

ü  On our test bench, the internal amplifiers of this receiver #...0723 produced 45 Volts per channel @ 8 Ohms with 1KHz input for 253 Watts and 37.4 Volts per channel @ 4 Ohms with 1KHz input for 349 Watts via discrete outputs with 1 kHz input.
 AC Idle current @ .7A,
DC balance adjusted to 0 ±3mVDC and DC offset output adjusted to <~30mVDC either channel. Floor noise measured 0mVAC / >60dB either channel.
   ____________________________


The Pioneer SX-1980 Stereo Receiver. This is the first one of these we've had in 19 years. Even as a Pioneer dealer, back in the day, the stores I worked at didn't carry this model as it was generally TOO EXPENSIVE for the market (equaling about 10% of the average persons yearly take-home pay).
Classic looking brushed-aluminum silver face and encased in a real wood Walnut veneer cabinet with solid Walnut wood corner caps. This is the most SERIOUS receiver Pioneer ever marketed and as listed above, this one has been 'certified' following the refurb by Oak Tree Vintage and is in incredible condition!!! 
An interesting note on this one is that the consignor picked it up from a member of the Denver based, 1970's band, 'Sugar Loaf'
(famous for hit's such as "Green Eyed Lady" and "Don't Call Us, We'll Call You"). It was speculated to have been the amp in their practice space.

Pioneer SX-1980 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 C, or A+B or A+C, or Off speaker selector
- Defeat-able 4-control / 2-band EQ. (Bass controls centered at 50 or 100 Hz and Treble @ 10k or 20kHz)
- 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® / i-gadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
 - Tape 'Dubbing' capability for Tape 1 to Tape 2
- Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / i-gadget / 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
- 4- Position phono cartridge loading selector with settings at 100, 200, 300 or 400pf for fine tuning phono pre-amp
- 3- Position cartridge impedance selector with settings at 10k, 50k, or 100k for fine tuning phono pre-amp
to your cartridge (a must for serious vinyl players)
- 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-1980 Specifications:


  "The Pioneer SX-1080 has a continuous power output of 270 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:

THD:
0.02% @ 135 Wpc @ 8 Ohms & 0.03% @ Full Rated Output @ 8 Ohms
Freq Response of power amp section:
@ full rated power 20-20kHz. @1W it's rated down to 0.006%
Potential frequency response of power amp section @ 1w:
5 Hz to 100 KHz, +0 dB, -3 dB
IMD utilizing AUX: 0.03% @ 270 Wpc 20-20kHz
0.02% @ 135 Wpc 20-20kHz
0.006% @ 1 Wpc 20-20kHz

Hum / Noise (S/N) Ratio: 120dB (10 db greater than the Pioneer SX-1080)
Damping factor:
40 @ 8Ω full bandwidth
Power Amp Input Impedance:
50k Ohms
Power Amp Input Sensitivity for Full Output:
2V (coupled with the 2V output of the pre-amp, has a lot to do with the VERY high S/N listed above)
Tone Control ranges:

Sub Bass: +/-5dB @ 50Hz
Bass:
+/-10dB @ 100Hz
Treble: +/-10dB @ 10kHz
Upper Treble: +/-5dB @ 20kHz
Hi Filter: 6
KHz, 12dB/octave
(most are 6dB/ octave)
Lo / 'Sub' Filter: 15Hz, 12dB/octave (most are 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  Sensitivity / Impedance: 7.5mV / 50k Ohms
Input Freq Response (except Phono & Mic): 5-80kHz
Tape Output Impedance: 50kΩ
Tape Output:
150mV

Pre-Amp Output
Level & Impedance: 2V / 1k Ohms (coupled with the 2V input of the power-amp, has a lot to do with the VERY high S/N listed above and double the SX-1080)
Pre-Amp THD @ rated output: <0.01%

TUNER SPECS FOR FM:
Freq Response:
The full 30-15kHz per FCC Regulations
S/N:
 > 85 dB Mono @ 65dBf
S/N: 
> 75 dB Stereo @ 75dBf
Useable Mono RF Sensitivity dBf / μV:
8.7dBf / 1.5μV
Capture Ratio:
1.0dB
Signal for 50dB quieting, Mono dBf / μV:  
11.5dBf / 2.2μV
Signal for 50dB quieting, Stereo dBf / μV:  36dBf / 34μV
De-Emphasis: selectable 25 or 75 μ-sec
THD w/ 100% modulation @ 100Hz, Mono: 
0.05%
THD w/ 100% modulation @ 1kHz, Stereo: 
0.07%
THD w/ 100% modulation @ 6kHz, Mono:  0.02%
IF Response Ratio: 
120dB
(20db greater than the Pioneer SX-1080)
Stereo Sub-Carrier Rejection: 
65dB

AM Carrier Rejection:
60dB
(5db greater than the Pioneer SX-1080)
Spurious Rejection:
120 dB
(30db greater than the Pioneer SX-1080)
Image Response Ratio:
120 dB
(30db greater than the Pioneer SX-1080)
FM Alternate Channel Selectivity: 
80dB
Muting Threshold dBf / μV:
19.2dBf / 5μV
Stereo Separation:
50dB @ 1kHz or 40dB @ 30-15kHz

TUNER SPECS FOR AM:

RF Sensitivity: 300uV/meter or 15uV @ binding posts
Alternate Channel Selectivity:
26dB
IF Response Rejection Ratio:
70dB
(30db greater than the Pioneer SX-1080)
Image Response Rejection Ratio:
70dB
(30db greater than the Pioneer SX-1080)
Signal to Noise Ratio:
55dB
(5db greater than the Pioneer SX-1080)

PHONO SECTION SPECS:
Freq Response:
20-20kHz ±0.2dB
S/N:
87dB, ref 'shorted' input (11dB greater than the PIoneer SX-1080!!!)
Input Sensitivity:
2.5 mV with load selectable 10k, 50k or 100kΩ
Overload limit:
300 mV @ 1kHz w/ THD of 0.03%
Cartridge Load Capacitance: 100,200,300,400pF


Huge power supply in the Pioneer SX-1980 featuring Dual independent, toroidal transformers (in one housing) for a 'TRUE DUAL POWER SUPPLY', followed by 4X 100V / 22,000μF power supply filter caps to feed the huge output transistors.
Again, we have completely gone through the Pioneer SX-1980 Stereo Receiver, as stated above and 'certified' it's ready to go!
The only 'performance' issues would be the previously mentioned tuner LED's in FM mode, and cosmetically, the scuffs on the top, horizontal face edge, the volume knob scuff and the lighter, real wood Walnut cabinet.  Unit looks great and sounds HUGE! This is truly one of the "BIGGEST BOYS" when it comes to CLASSIC STEREO RECEIVERS! Includes a pdf, 'e' copy, download of the Pioneer SX-1980 owners / users / instruction manual, Service manual and original brochure if the purchaser so desires. Measures 22.25" wide x 20" deep x 8.25" high and weighs a HEAVY 73 lbs unpacked. Includes our 90 day limited warranty!
PIONEER SX-1980 STEREO RECEIVER
 Cond. 8.5
$6,300.00
SOLD
SHIPPED TO MONTANA

(Cons.) M.R.

links to a couple of "Shoot Out" articles featuring the SX-1980;


https://www.cnet.com/news/how-can-30-year-old-receivers-sound-better-than-new-ones/

http://www.iavscanada.com/receiver-shoot-out-vintage-vs-high-tech/

(Due to the dimensions and / or weight of this receiver, Packing / Shipping will be somewhat more 'involved' than typical. A custom built box may be necessary to order. While we order custom built boxes often, this can sometimes delay shipping by 5-10 days)

(Above text 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.

 

 

 

Did you know?
It would be hard to name a category of 'musical instruments', 'audio equipment', 'motorized vehicles', or 'sporting equipment' that Yamaha does not have a 'hand in' with 'branded models'. Most folks do not realize this, but Yamaha is one of the oldest companies in existence, certainly when it comes to music gear and was actually established in 1887 and was incorporated on October 12, 1897! The company's origins as a musical instrument manufacturer is still reflected today in the group's logo—a trio of interlocking tuning forks. Yamaha has grown to become the world's largest manufacturer of musical instruments. I have worked for Yamaha dealers over the years, in both the 'consumer' level and 'pro-audio' / 'MI' level. Their gear was 'spec'd' more often in the military contracts we received, than any other brand. I knew when I sold a Yamaha unit, there was little chance of an 'issue after the sale'. Yamaha products are known as having about the best 'resale value' of any brand, regardless of the product class.

 

   
 

 

 


We've moved the "SOLD / ARCHIVED" items to their own page.
Click ........HERE.


 


**
"(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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Vintage Stereo Equipment receivers speakers Classic Silver Audio Collection and jerry gahagan

 

.... Surround yourself with Silver and find it again!



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