NEW ADDITION 2/4/11
 (Click on above thumbnails to enlarge photos)
  warranty
VINTAGE STEREO RECEIVER KENWOOD 'SUPER QUAD' QUADRAPHONIC / 4-CHANNEL / 2-CHANNEL STEREO RECEIVER KR-9940 / KR-9340  kr9940
#...0541  
Circa 1973-76
   "WORLD AC POWER" ™
 M.I.J. 
 for sale
 Receiver has had complete service including cleaning everything including all switches, controls and contacts including phono and tape monitor selectors. Capacitor replaced in protection circuit. We also resolved a decoder issue, the aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! The all dial & meter lamps replaced with new bulbs for trouble-free service. We also disassembled the power switch and replaced the internal neon lamp (the power switch on this unit actually 'lights' up when the unit is off, presumably to make it easier to find in a darkened room and is off when the unit is on). We also, removed the entire output / heat sink section, removed all the output transistors and applied fresh heat sink compound which should be good for another 30 years now. 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 into a 4 ohm load.
 
  On our test bench, this particular KR-9940, #...0541, amplifiers each produced 23.75 volts  per channel for 70 watts per channel @ 8 Ω via discrete output & 19.74 volts per channel for 97 watts per channel @ 4 Ω via discrete, Metal cased, TO-3 outputs.
(AC draw at idle 0.60A tested)
(Floor noise measured at 2.5mvAC)
 ___________________________
 
  Impressive huge Kenwood Silver-face receiver, surrounded by handsome, real Walnut wood veneer side plates. This unit has about the highest 'KPD-Factor' of any we've had in a long time. What's a 'KPD Factor'? 'Knobs per Dollar! You could also say it has very high 'MPD' and 'LPD' factors as well (you should be able to figure those out now). Features gorgeous, back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. This unit appears to have been marketed under two model numbers. The KR-9940 and the KR-9340 (likely one for North America and the other for the rest of the planet).
From original Kenwood brochures, "Kenwood KR-9940 can function as a two or four channel receiver, having a built in regular matrix and SQ type decoders....As a four channel receiver the amplification channels work separately, each driving one of four speakers....The semi-complementary directly coupled power amplifiers have wideband and low distortion characteristics which ensure smooth, high-fidelity amplification....Two pairs of speaker terminals are available to permit simultaneous listening at two different places....A double switching demodulator is used in the MPX section to prevent carrier leaks and ensure the best sound quality".
 Features include:
  
- Quadraphonic (no it's not spelled 'quadriphonic' !!!) / Stereo receiver 
 - Weighted flywheel analog tuning
  - A, B, Off or A+B Front and Rear speaker positions
  - Separate Front and Rear Bass and Treble controls
- Balance controls allow complete blending between Front and Rear / Left and Right
 - Built-in Hi and Sub filters for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
  - FM muting (separate from Stereo / Mono selector)
  - 'Mode' selector for Stereo / Mono, 2-Channel & 4-Channel modes of 'RM' / 'SQ Logic', or 'Discrete'.
 - Aux inputs for both Front and Rear (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
  - Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's for both Front and Rear
 (Tape Monitors can be used with 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)
 -  Dual Phono / Turntable inputs with Built-In Phono Pre-Amp, featuring 'Phono-2' compatible with 'CD-4' cartridges
  - Loudness control for increasing 'rock-n-roll smile' tone curve at lower volumes
- Dual Meter Level selector
   - Front and Rear 1/4" stereo headphone jacks
   - Rear mounted 1/4" microphone jack (be careful with your speakers if you are going to utilize this!)
  - Tuning window features dual VU meters for tuning and signal strength
  - Quad VU meters for power output level
  - FM Detector RCA output
  - *Kenwood's KCD-2, CD-4 system, disc demodulator Adaptor slot and includes the KCD-2 adaptor that is often missing on these models
 - Rear located, full barrier strip for external antenna connections
- Rear located main AC protection fuse
  - Triple AC convenience outlets on rear panel with 1 switched and 2 un-switched for a total capacity of 160 watts of accessories
  - True “WORLD AC POWER"™
   as it will work on both 50 or 60 Hz AC and voltages from 110-240 volts AC

Original Specs:
  "The KR-9940 has a 'Direct-Coupled / DC' amplifiers that produce continuous power output of 40 watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.5% THD (measured utilizing AUX input)"
 
 POWER / PRE AMP SPECIFICATIONS:
 THD; 0.5% @ full rated power or 0.1% @ 50% rated power @ 1kHz.
 Freq Response of power amp section;
 @ full rated power 20-20kHz
 Power bandwidth of power amp section; 10-50,000Hz ±0dB
 IMD utilizing AUX;
 0.5% @ full rated power / 20-20kHz and 8 Ohms
 Damping factor; 30 @ 8Ω full bandwidth
Dynamic rated Power: 2 x 240 watts @ 8 Ohms or 340 watts @ 4 Ohms
Cont rated Power:
4x 40 watts @ 8 Ohms / 20-20kHz
4x 44 watts @ 8 Ohms / 1kHz
4x 55 watts @ 8 Ohms / 1kHz


  Hum and Noise;  75dB on AUX / Tape
Input Sensitivity AUX / Tape; 150mV @ 50kΩ
  Tape 1/2 Output level, via RCA; 150mV @ 50kΩ
  Bass Control;  ±10dB @ 100hz
  Treble Control;  ±10dB @ 10khz
  Low Filter;  -8dB @ 100Hz @ 6dB Oct
  High Filter;  -6dB @ 5kHz @ 6dB Oct
  "Loudness" Contour;  +10dB @ 100hz, +5dB @ 10khz (w/ volume set at -30dB)

PHONO SECTION SPECS:
 Freq Response; 20-20kHz RIAA Standard Curve +/- 1dB.
 S/N; 60 dB
 Input Sensitivity; 1.5 mV @ 50kΩ
 Overload limit; 100 mV w/ 5% THD @ 1kHz

TUNER SPECS FOR FM:
 Freq Response; 20-15kHz
 S/N; > 63db Stereo w/ 1mV input
 AM Suppression; 60dB
 Mono Sensitivity; 1.8 μV
 Capture Ratio; 3.0dB
IF Rejection; 90dB
  Spurious Noise Ratio; 90dB
 THD w/ 100% modulation @ 400Hz, Mono;  0.7%
 THD w/ 100% modulation @ 400Hz, Stereo;  0.8%
Stereo Separation; 40dB at 1Khz & 20dB @ 10kHz
 FM Alternate Channel Selectivity; 50dB

  TUNER SPECS FOR AM:
  Tuning Range; 530-1600kHz
  S/N; > 45db w/ 1mV input
  Useable Sensitivity; 25μV / m with ferrite stick antenna
Image Rejection; 45dB
IF Rejection; 35dB
  Selectivity; 30dB

 Power consumption at max output; 550 Watts. 38 Watts w/ no signal at idle
  
  Again, we have completely gone through this receiver. Everything is in fabulous electrical and cosmetic condition! Looks near new and sounds great! Very nice looking when lit up at night or in a darkened room! Comes with a PDF service manual.  Measures 21.5" wide x 6.5" tall x 14.5" deep and weighs an impressive 47 lbs unpacked. Includes our standard 90 day limited warranty.
  KENWOOD KR-9940 STEREO RECEIVER
  Cond. 8.5
$889. w/ KCD-2 Quadraphonic adaptor installed
*$799. if you don't need the adaptor

 

    

        NEW ADDITION 10/12/11
  (Click on above thumbnails to enlarge photos)
  warranty
HUGE & VINTAGE
KENWOOD
       KR-9000G / KR-NINE-G kr9000g
   STEREO RECEIVER
 #...0989  
 circa 1978
"WORLD AC POWER" ™
   MIJ!
   for sale
   We have completely gone through this unit cleaning everything including all switches, controls and contacts. Extensive cleaning of unit internally. Controls were 'flooded' w/ 'De-OxId' and are quiet (very difficult to do as 'tone' section must be painstakingly removed). Switches such as the 'Function' selector and the 'Tone Bypass' switch were also flooded with cleaner. We also aligned the tuner front-end on both AM & FM bands for optimum performance as older tuner components will have 'drifted' over the years. Replaced 'frayed' section of tuner string then re-tensioned to increase traction & relieve flywheel binding and re-centered pointer to correct dial position. VERY GOOD TUNER! Generally AM reception in a stereo receiver is treated as an 'after thought', but the AM reception on this one is WAY above average. Pulls in stations like an old 'Tube' radio! FM reception also incredible and IMPECCABLY CLEAN!!! We replaced 19 light bulbs, including ALL dial & meter lamps, the dial pointer lamp, the 'Speakers' bulb, 'FM', 'AUX', 'PHONO 1', 'NR MODE' and the timer lamp with new units for trouble-free service. Both power supply filter capacitors removed and independently tested. Only issues are that the 'FM Mute' push switch occasionally must be pushed a second time to 'lock' and there is a 60Hz background hum in the 'Headphone' jacks.
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, (with the exception of the timer which still worked (works) fine, but we have 'set default to 'Power-ON' and 'pre-loosened' connector linkage sleeve as it will likely break in the future (almost 100% of the time) from a user applying too much torque at some point. We avoid this likely future issue by disconnecting the linkage on all the Kenwoods that have a timer (can be reconnected if user wishes)). 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. Total restoration time investment ~14 hours. You will not be disappointed.
   
 From the original Kenwood KR-9000G / Kenwood Nine G' service manual, "80 watts per channel minimum RMS, both channels driven, at 8 ohms from 20-20,000 Hz with no more than 0.03% harmonic distortion"
- However -
   On our test bench, the internal amplifiers of this receiver #...0989, produced 30 volts per channel @ 8 ohms with 1Khz input for 112 watts and 26 volts per channel @ 4 ohms with 1Khz input for 169 watts via discrete, TO3, metal cased outputs. (2x 2SC1116 & 2x 2SA747)
 AC Idle current at .55A, & floor noise L=<0.3mvAC & R=<0.2mvAC.
   _____________________________
   
   One of the 'Big Boys' Stereo Receivers from Kenwood! This is from massive 'G' series. Beautiful 'Charcoal' anodized, aluminum face with gorgeous, BLUE backlit analog, slide rule tuning dial and analog VU meters.
This unit has a very high 'KPD-Factor' as well as 'MPD' and 'LPD' factors as well. Features gorgeous, BLUE / AQUA back-lit slide rule analog tuning scale with matching VU meters as well. VERY elegant and IMPRESSIVE unit when lit in a darkened room. This unit was marketed under two model numbers. The Kenwood 'KR-Nine G' and the 'KR-9000G' (likely one for North America and the other for the rest of the planet).
All original milled, aluminum Kenwood knobs intact. Original, REAL walnut wood veneer case in spectacular condition with only VERY minor wear. No breaks or repairs to the wooden cooling louvers. Entire unit is a thing of beauty.
Features are:
   
   - Weighted flywheel analog AM/FM slide-rule tuning with lighted dial pointer
   - Separate Bass, Mid & Treble EQ with super quality de-tented controls
- Super quality, De-tented Volume control
- Tone Defeat selector for 'purest' signal path if desired
- Triple Pair Speaker Selector; A, B, or C or A+B or A+ C or Off speaker selector (two pair at a time)
- Built-in 'Pre-Out / Power-Input' loop
 - Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
   - Loudness to accentuate bass response at lower volumes
   - Dual Analog VU meters for Power Output w/ dual range selector
   - Dual Analog VU meters for tuning and signal strength
   - Stereo / Mono selector (for entire pre-amp section, not just FM tuner)
   - FM Muting to eliminate 'hiss' between stations.
- Rear mounted FM 'De-Emphasis' selector for either 50μsec or 75μsec
   - Stereo indicators
 - Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
   - Dual tape monitors with bi-directional dubbing
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
   - Dual Phono / Turntable inputs w/ built-in Phone Pre-Amp
- Built-In AM 'Stick' Antenna
- 1/4" front mounted, Microphone input jack w/ 'Mixing' pot to inject your voice or other instrument signal into current program (BE CAREFUL WITH YOUR SPEAKERS DOING THIS!!!)
- 400Hz 'Record Calibration' tone generator built-in
   - Dual 1/4" Stereo Headphone Jacks
 - Built-in Dolby NR / FM decoder and it works well (brightens highs even on non-Dolby FM broadcasts)
- 120 Minute 'Sleep Timer' (we ship these receivers with the function 'disconnected' to eliminate future issues)
 - TripleAC convenience outlets; 2 'Switched' and 1 'Un-Switched for a total rated capacity of 400 watts
   - True "WORLD AC POWER" 50 / 60 cycles and 110V, 120V, 220V & 240V AC current

  Original Specs:
  
  POWER / PRE AMP SPECIFICATIONS:
Power output: 110wpc @ 4 Ohms
80wpc @ 8 Ohms
280 watts 'dynamic power' @ 4 Ohms
THD; 0.03% @ full rated power & 8 Ohms
0.01% @ 1/2 power
  IHF IMD; 0.03% @ full rated power & 8 Ohms
  Freq Response of power amp section;
  5-100,000kHz
  IHF IMD; 0.03% @ full rated power & 8 Ohms
0.01% @ 1/2 power
  Potential power bandwidth power amp section;   5-100,000kHz
   Damping factor; 40 @ 8Ω / 1kHz
   Signal / Noise;  115dB !!! @ AUX / Tape 'shorted'
   Input Sensitivity AUX / Tape; 120mV @ 50kΩ
   Bass Control;  ±12dB @ 50hz
   Mid Control;  ±12dB @ 800hz
   Treble Control;  ±12dB @ 15khz
   Low Filter; -15dB @ 18Hz
   High Filter; -6dB @ 10kHz
   Loudness Control; +10dB @ 100Hz (-30dB VOL)
   Output levels / impedance; Tape RCA 150mV / 100 Ohms
DIN 30mV / 80kOhms
Pre-Out 10V? / 1k
 
  TUNER SPECS FOR FM;
Tuning Range; 88-108MHz
  Freq Response; 30-15kHz
  S/N @ 65dBf; >80db Mono or 74dB Stereo
  Capture Ratio @ 65dBf; 1.0 dB
  THD Mono @ 1kHz; 0.1%
  THD Stereo @ 1kHz; 0.15%
  FM Alternate Channel Selectivity; 75 dB
   Spurious Noise Ratio; 85 dB
   IF Rejection; 75 dB
  AM Suppression; 65 dB
  Stereo Separation; 45 dB @ 1k & 35dB @ 50-15kHz
 Subcarrier Product Suppression; 46 dB

   TUNER SPECS FOR AM;
Tuning Range; AM Band 540 kHz-1600 kHz
S/N; >50db
  Useable Sensitivity (IHF Bar Antenna); 20μV
  Selectivity; 30dB @ 1kHz
  IF rejection; 55dB @ 1kHz
  THD; 0.5% @ 80dB / m
 
  PHONO SECTION SPECS;
  Freq Response; 30Hz-20kHz w/ RIAA deviation; ±0.3dB
  S/N; >80dB, IHF-A curve
   Input Sensitivity; 2.5mV @ 50kΩ
  Overload limit; 230mV @ 1k w/ 0.03% THD
 
Again, we have completely gone thru this unit and it's 'Ready To Go'! This is a HUGE 'Military' / Euro / Asian market 'Monster' receiver from 1978! The unit looks fabulous, works and sounds great! Includes a copy of the service manual. Receiver measures 24.5" wide x 18.25" deep x 8.5" high and weighs 44 lbs unpacked. Includes our standard 90 day limited warranty.
KENWOOD KR-9000G STEREO RECEIVER
   Cond. 8.5+++
   $899. (C)
M.R.
 

        NEW ADDITION 10/12/11
  (Click on above thumbnails to enlarge photos)
  warranty
VINTAGE STEREO RECEIVER
YAMAHA
      CR-820 cr820
STEREO RECEIVER 
#...6787  
 circa 1977-'79
   MIJ!
   for sale
   We have completely gone through this unit cleaning everything including all switches, controls and contacts. We also aligned the tuner front-end for optimum performance as older tuner components have drifted over the years. Output transistor bias adjusted to correct 08.0mv. Re-tensioned internal fuse holder clips. Re-tensioned tuner string to relieve flywheel binding and re-centered pointer to correct dial position. VERY GOOD TUNER! Generally AM reception in a stereo receiver is treated as an 'after thought', but the AM reception on this one is WAY above average. VERY GOOD TUNER! FM reception as well great and IMPECCABLY CLEAN!!! We replaced ALL meter lamps and the dial pointer lamps with new units for trouble-free service. All inputs tested and both sides produce clean and even sine waves into 'brick-wall' 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent! All functions test fine. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. You will not be disappointed. Total restoration time investment ~14 hours.
   
   On our test bench, the internal amplifiers of this receiver #...6787 produced 22.5 volts per channel @ 8 ohms with 1Khz input for 63 watts and 17.8 volts per channel @ 4 ohms with 1Khz input for 79 watts via discrete, TO3, metal cased outputs.
 AC Idle current at .25A, DC output <17ma either channel. Floor noise at 00.3mVAC either channel.
   ____________________________
   
   One of the classics from Yamaha! This is from one of the most sought after Yamaha receivers. Beautiful brushed solid aluminum front panel with analog, slide rule tuning dial. All original aluminum Yamaha knobs intact and in near new condition. Features are:
   
   - Weighted flywheel analog AM/FM slide-rule tuning with lighted dial pointer
   - Separate Bass, Presence (mid) & Treble EQ with super quality de-tented controls
 - Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
   - Features Yamaha's own "Variable Loudness Contour" control utilizing high quality de-tented potentiometer 
   - Instant -20db audio level muting
   - Analog VU meters for tuning and signal strength
   - Stereo / Mono selector (for entire pre-amp section, not just FM tuner)
   - FM Muting
   - LED AFC Station lock & Stereo indicators
   - Speaker selector for A - B, A+B, or Off
 - Aux inputs (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
   - Dual tape monitors with bi-directional dubbing
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
   - Phono / Turntable input w/ built-in Phone Pre-Amp
   - Dual 1/4" Stereo Headphone Jacks
  
  Original Specs:
   The Yamaha CR-800 has a continuous power output of 50 watts per channel min. @ 8 ohms from 20 hertz to 20,000 hertz with no more than 0.05% THD (measured utilizing AUX input)
  
  POWER / PRE AMP SPECIFICATIONS:
  THD; 0.05% @ full rated power
  IHF IMD; 0.05% @ full rated power
  Freq Response of power amp section;
  @ full rated power 20-20kHz
  IHF IMD; 0.05% @ 1 watt / 20-20kHz
 
  Potential power bandwidth power amp section; 10-50,000Hz
   Damping factor; 40 @ 8Ω / 1kHz
   Signal / Noise;  >97dB @ AUX / Tape
   Input Sensitivity AUX / Tape; 120mV @ 45kΩ
   Bass Control;  ±13dB @ 50hz
   Presence Control;  ±13dB @ 3khz
   Treble Control;  ±6dB @ 20khz
   Low Filter; 25Hz @ 12dB / Oct
   High Filter; 10kHz @ 12dB / Oct
   Loudness Control; Variable
 
  TUNER SPECS FOR FM;
Tuning Range; 88-108MHz
  Freq Response; 30-15kHz
  S/N @ 65dBf; > 77db Mono or 73dB Stereo
  Capture Ratio @ 65dBf; 1.0 dB
  THD Mono @ 1kHz; 0.1%
  THD Stereo @ 1kHz; 0.15%
  FM Alternate Channel Selectivity; 75dB
   Spurious Noise Ratio; 100dB
   IF Rejection; 90dB
  AM Suppression; 65 dB

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

   TUNER SPECS FOR AM;
   Tuning Range; 525-1605kHz
   S/N @ 80dB / m; >50db
  Useable Sensitivity (IHF Bar Antenna); 49dB / m
  Selectivity; 30dB @ 1kHz
  IF rejection; 55dB @ 1kHz
  THD; 0.4% @ 80dB / m
 
  PHONO SECTION SPECS;
  Freq Response; RIAA deviation; ±0.5dB
  S/N; >92dB!!!, IHF-A
   Input Sensitivity; 2mV @ 50kΩ
  Overload limit; 120mV @ 1k
 
Again, we have completely gone thru this unit and it's 'Ready To Go'! Huge, vertical finned heat sinks for great cooling efficiency of outputs. Great sounding 'Phono' section (check the corresponding S/N ration above). Also, check the S/N ratio of the FM tuner in 'Stereo'! The brushed Aluminum face and knobs are in great condition. The vinyl wrap, wood grain case is also in great condition. The unit looks fabulous, works and sounds great! Includes a copy of the owners / users manual. Receiver measures 20" wide x 15.5" deep x 6.5" high and weighs 29 lbs unpacked. Includes our standard 90 day limited warranty.
   YAMAHA CR-820 STEREO RECEIVER
   Cond. 8.5+++
   $549.
SOLD 1/20/12 D.W.A.

NEW ADDITION 10/12/11
  (Click on above thumbnails to enlarge photos)
  warranty
VINTAGE STEREO RECEIVER
MARANTZ
MODEL 2220B
STEREO RECEIVER
#...0883
Circa 1974-77
(actual internally dated 1976)
Classic 'Blue Face'
MIJ
SOLD 10/27/11
We have completely gone through this thoroughly cleaning inside and out including all contacts, switches, controls and I/O jacks. All internal fuses checked for correct values. All indicator lamps checked and all 8 dial & meter lamps were replaced, as well as the lamps in the 'dial pointer' with new bulbs, for trouble-free service. We also aligned the VERY sophisticated tuner for optimum performance on both AM and FM. Dial pointer track was cleaned of old lube and re-lubed w/ silicone grease. We also replaced a missing 'Speaker B' output clip with original and re-tensioned the rest of the speaker clips. All functions tested for perfect operation. Power supply adjusted to correct 35VDC +/- 0.02V. All inputs tested and both sides produce clean and even sine waves! Tone controls are super quality, Alps brand, "full-size", de-tented potentiometers. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 72 hours. All functions test perfectly. Total restoration time investment ~8 hours.
 
On our test bench, this unit of this receiver #...0883,  amplifiers produced 15.5 volts @ 8 Ω per channel for 30 watts / channel and 12 volts @ 4 Ω per channel for 36 SOLID watts / channel via discrete, TO-3 style, Original Marantz metal cased output devices at 1khz. (2x D168 & 2x A627)
AC current at idle measured at 0.2A.
DC output <12mV either channel.

Classic 'Blue Face' Marantz, 2220B stereo receiver. Elegant looking Face is milled from a solid plank of Aluminum with matching milled aluminum controls. This unit looks fabulous.
 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 Bass, Mid and Treble utilizing high quality 'Alps' brand pots
- Built-in Hi filter for reducing 19kHz pilot tone and 38kHz Harmonic in FM broadcasts & Tape hiss.
 - FM muting, separate from FM stereo selector
- 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 inputs (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 / Output'
 (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' meter
- 'Dolby FM / 25 μsec' selector
- Built-In AM 'Stick' antenna
- 'Quadradial' RCA tuner output for scope
   - 1/4" Stereo Headphone Jack
- Externally located protection line fuse
- Dual AC convenience outlets on rear panel with 1 switched and 1 un-switched for a total capacity of 260 watts of accessories
 
Original Specs:
  "The Marantz 2220B has a continuous power output of 20 watts per channel min. @ 8 or 4 ohms from 20 hertz to 20,000 hertz with no more than 0.5% THD (measured utilizing AUX input)"
 
POWER / PRE AMP SPECIFICATIONS:
THD: 0.5% @ 8Ω @ full rated power
Freq Response of power amp section;
@ full rated power 20-20kHz
Dynamic Range; 96dB
Power Bandwidth; 10Hz-50,000Hz
 IMD utilizing AUX; 0.9% @ 8Ω
Damping factor: >20 @ 8Ω full bandwidth
Channel Separation: >30dB @ 8Ω full bandwidth

TUNER SPECS FOR FM:
Freq Response: 50-15kHz
Useable Mono RF Sensitivity: 2.5 μV
Capture Ratio: 3.0dB
Signal for 50dB quieting, Stereo: 50.0μV
THD w/ 100% modulation @ 400Hz, Mono:  0.3%
Stereo Sub-Carrier Rejection: 68dB
Stereo Separation @ 1kHz: 40dB

PHONO SECTION SPECS:
Input Sensitivity: 1.8 mV @ 47kΩ
 
Again, as stated before, we have completely gone through this unit cleaning and testing all. 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. Tuner section is magical to listen to. Overall a pleasing unit to listen to in all aspects. Measures 17.25" wide x 14" deep x 5.5" high and weighs 26 lbs unpacked. Includes our standard 90 day limited warranty!
MARANTZ 2220B STEREO RECEIVER
 Cond. 8.5+++
SOLD 10/27/11

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.

NEW ADDITION 2/4/11
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE STEREO RECEIVER
SONY
        STR-V5 STRV5  
STEREO RECEIVER
#...0259
CIRCA 1978
 MIJ
SOLD 2/15/11
We have completely gone through this cleaning inside and out including all contacts, switches and controls. AM & FM tuner re-aligned and front-end adjusted for optimum performance. All dial & meter lamps replaced with new bulbs (we even surgically removed the original 'Blue' gels and installed them on the new lamps). This unit has been upgraded to rubber sheets to transfer heat to heat sinks as opposed to compound, on all output transistors. Cleaned tuning capacitor for clarity. 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.
 
  On our test bench, the internal amplifiers of this particular unit  #...2371, produced a strong 30.5 volts per channel @ 8 ohms for 116 watts per channel, and 26 volts per channel @ 4 ohms for 169 watts per channel via discrete, outputs with 1 kHz input. (4x B700 & 4X D736)
(DC output: L channel = 6.5mv & R channel = ~-5 mv. AC draw at idle 0.65A tested)
 ____________________________
 
Massive looking Silver-face Sony STR-V5 Stereo Receiver. Only the second one of these "Big" STR-V5's we've had in over 13 years. We've had a few "4's" but only two "5's". Huge features include full length tinted and beveled glass dial window and giant sculpted knobs for tuning and volume. Internally this model is impressive as well. The Huge power transformer is completely shielded. The outputs are cooled by a very large heat sink with vertically oriented fins, as they should be. Tuning is handled by a '7-Gang' tuning capacitor. The tone controls are 'Very Musical' sounding and a pleasure to use. Looks, performs and sounds great!
 Features include:
 
 - Heavy, Weighted analog flywheel tuning with fully lit "Slide Rule" dial
- Separate Bass and Treble tone controls featuring high quality de-tented pots
 - A, B, & A+B and "Off" speaker set selector
 - Dual "True" tape monitors
 (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / iPod / MP3 / XM / SIRUS CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
 - Bi-Directional Tape dubbing
- AUX Input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
 - Phono / Turntable input with Built-In Phono Pre-Amp
- Dolby FM de-emphasis
 - Hi filter for reducing tape hiss / electronic hiss & noise and record static
 - Built-in "Low" / Subsonic Filter to eliminate excess rumble from sources such as turntables
 - FM muting, separate from FM stereo selector
- Stereo / Mono mode selector for Pre-Amp section
- Dual Analog, VU Power Meters (right meter switchable between "Power" and tuner "Signal Strength" function)
- Analog, VU style, Tuning and Signal Strength meters (right meter switchable between "Power" and tuner "Signal Strength" function)
  - Built-In Ferrite "Stick" AM antenna on rear panel
  - Front mounted 1/4" stereo headphone jack
 - Dual AC outlets on rear panel (1 switched & 1 un-switched) with a total capacity of 400 watts.

SPECS:

    

NEW ADDITION 2/4/11
(Click on above thumbnails to enlarge photos)
warranty
VINTAGE STEREO RECEIVER
KENWOOD
          KR-7600 KR7600
STEREO RECEIVER
W/ WOOD CASE
  Circa 1976-80
 M.I.J. 
SOLD 2/14/11
 Receiver has had complete service including cleaning everything including all switches, controls and contacts including the famously, very difficult to access, KR-7600 phono and tape monitor selectors. While in that subassembly, we also took the opportunity to 'Re-Flow' the I/O jack solder joints to assure solid contact. We also aligned the tuner front-end for optimum AM & FM performance as older internal tuner components have always drifted on vintage gear over the years. VERY GOOD TUNER! Generally AM reception in a stereo receiver is treated as an 'after thought', but the AM reception on this one is WAY above average. Pulls in stations like an old 'Tube' radio! FM reception also incredible and IMPECCABLY CLEAN!!! The FM indicator, and all dial & meter lamps replaced with new bulbs for years of trouble-free service. We also, removed the entire output / heat sink section, removed all the output transistors and applied fresh heat sink compound which should be good for another 30 years now. 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.
The only issues are cosmetic in that the real, wood, Walnut veneered case has a few scuffs, past repairs and minor 'battle scars' (see photos above).
Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours into a 4 ohm load.
 
  On our test bench, this particular KR-7600, amplifiers each produced 28 volts  per channel for 98 watts per channel @ 8 Ω via discrete output & 23 volts per channel for 132 watts per channel @ 4 Ω via discrete, Metal cased, TO-3 outputs ( 2 each Toshiba 2SB555 and 2SD425) 
(AC draw at idle 0.50A tested)
(Floor noise measured at a low 00.1mvAC on the left and 00.3mvAC on the right)
 ___________________________
 
  Impressive huge Kenwood Silver-face receiver, wrapped in handsome, real Walnut wood veneer case. Features huge, back-lit slide rule analog tuning scale. Very elegant unit when lit in a darkened room. Features include:
  
  - Weighted flywheel analog tuning
  - A, B, C or A+B speaker positions plus an "Off" speaker position
  - Separate Bass and Treble controls feature high quality de-tented pots
  - Tone Defeat for purest signal path
  - Acoustic tone boost switches (very unusual feature allows +3 or +6dB boost at 50Hz and 800Hz) (This is in addition to the normal loudness switch this unit also features listed below)
 - Built-in Hi and Sub filters for reducing 19kHz pilot tone in FM broadcasts, Tape Hiss and the Sub filter for reducing turntable rumble
  - FM muting (separate from Stereo / Mono selector)
  - Stereo / Mono selector (separate from FM muting selector)
 - Aux input (may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
  - Dual tape monitors with Tape monitor A also featuring a DIN input as well as the standard RCA I/O's
 (Tape Monitors can be used with Tape / Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape dubbing A-B
 -  Dual Phono / Turntable inputs with Built-In Phono Pre-Amp
  - Front mounted 1/4" mic input with On / Off / Volume control (Sound Inject) for adding your voice or music instrument to the playback of your music) (be careful with your speakers if you are going to utilize this!)
  - Loudness control for increasing tone curve at lower volumes
  - Stereo Reverse (handy for troubleshooting speakers, system and audio issues)
  - Selectable 25 µsec De-Emphasis for FM section
   - Front mounted 1/4" stereo headphone jack
  - Tuning window features dual large dual VU meters for tuning and signal strength
  - FM Detector RCA output
  - Dolby Adaptor / additional tape monitor loop (also useful for effects / signal processor units such as reverbs, delays, DBX 3BX, etc.)
 - Rear located, full barrier strip for external antenna connections
  - Triple AC convenience outlets on rear panel with 1 switched and 2 un-switched for a total capacity of 300 watts of accessories
  
  Again, we have completely gone through this receiver. Everything is in fabulous cosmetic condition! Looks near new and sounds great! Very nice looking when lit up at night or in a darkened room!  Measures 20.5" wide x 7" tall x 15.5" deep and weighs an impressive 45 lbs unpacked. Includes our standard 90 day limited warranty.
  KENWOOD KR-7600 STEREO RECEIVER
  Cond. 8+
SOLD 2/14/11

** "(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.