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

STEREO PRE-AMPS, POWER AMPS,
 INTEGRATED AMPLIFIERS
USED, VINTAGE & CLASSICS

 

Stereo amps amplifiers & Pre-amps: Classic / pre-owned, Vintage stereo control / preamps, integrated amps & power amplifiers by Dynaco, Pioneer SA, SAE Mark, Sansui, Hafler, Kenwood KA, KC, KM Marantz PM, Onkyo, Technics, Sony, JVC, Harman Kardon HK.

 

   
 


PRE-AMPS:
 


 

 

 


UPDATED LIST 4/13/18
Pre-amps, Power amp & Integrated Amps
Coming Soon
(or at least as time allows):

Hafler 945 Pre-Amp / Tuner
(just passed final inspections. Signed off. Awaiting photos, research and text)

Hafler 9180
(just passed final inspections. Signed off. Awaiting photos, research and text)

Kenwood KA-5500 Integrated Amplifier
(tech has finished, awaiting final inspection / testing / sign-off)

Kenwood KA-6000 Integrated Amplifier
(Awaiting place on bench for further work)

Mitsubishi Pre-Amp / Tuner / Power Amp Combo DA-A10DC / DA-M10 / DA-C20 (in bench process with tech)

MXR Model 150 / "System Pre-Amp II"
(tech has finished, awaiting final inspection / testing / sign-off)

NHT SA-3
Power Amp
(tech has finished, awaiting final inspection / testing / sign-off)

Onkyo A-8017 Integrated Amplifier
 
(tech has finished, awaiting final inspection / testing / sign-off)

SAE MKIIIA Power Amp
(tech has finished, awaiting final inspection / testing / sign-off)

SAE TWO A7 Power Amp
(tech has finished, awaiting final inspection / testing / sign-off)

Sony TA-N220
Power Amp (tech has finished, awaiting final inspection / testing / sign-off)

Technics SU-V6X
 (just passed final inspections. Signed off. Awaiting photos, research and text)

Yamaha DSP-A1000 Integrated Amplifier
 
(just passed final inspections. Signed off. Awaiting photos, research and text)
and more...

 


POWER AMPS:
 

      

         NEW ADDITION 3/19/18
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REFURBISHED / SERVICED
PRE-APPRECIATED KENWOOD POWER AMPLIFIER
KENWOOD KM-206 / KM206 POWER AMP
'Military Market' / PX UNIT

600+ WATT MONSTER!!!
#...0052
Circa 1985-86
MIJ

for sale

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

ü  Unit bench checked / tested.

ü  Amp has been cleaned inside and out.

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

ü  All new panel illumination lamps replaced with new.

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

Amp designed using Huge Power Supply Transformer and oversized, vertical finned heat sink for very efficient and silent, passive cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 48 hours straight and it functioned flawlessly.
   

While this amp is originally rated at 150 Watts with both channels driven (310W + 310W "Peak Music Power"), on our test bench, this particular unit's (#...0052) amplifiers produced 38 Volts at 8 Ohms per channel for 180 Watts / channel and 26 Volts at 4 Ohms per channel for 169 Watts / channel via discrete output transistors (2x Sanken 2SA1216 & 2x 2SC2922 / 2274. (Idle AC current draw @ .4A.
Floor noise measured at L= 00.0mVAC and R=00.0mVAC / -60dBm) 
   

Great, later model power amp by Kenwood. Model KM-206. HUGE power output! Excellent for 2-channel (stereo) audio listening or for use in an A/V system. Lots of punch and headroom.
Kenwood KM-206 Features:
   

- 2- Channel stereo operation
- A or B speaker selector via high current relay
- Dual, Vertical, 7-Segment LED Power Output Meters with Dual Position Level Selector
- Built-in Protection circuit
- LED Status indicators
- Front-mounted 1/4" stereo headphone jack
- RCA input jacks
- Dual, vertical finned internal heat sink
- Oversize power supply transformer
- 3 Rear-mounted AC convenience outlets (2 switched and 1 un-switched for a total capacity of 200 Watts)

   
Kenwood KM-206 Original Specs:
 "150 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.03% THD"
Design type:
2 Channels, AB operation
Damping Factor; >35 @50Hz / 8 ohms
Signal / Noise; 120dB A weighted
Rated RMS Output: 155 Watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz.
Music Power 310 Watts + 310 Watts
THD;
0.03% at 'Full Rated Output'  / 8Ω w/ 20-20kHz
0.015% @ half rated power / 8Ω w/ 20-20kHz
0.001% @ half rated power / 8Ω w/ 1kHz
IMD; 0.002% @ rated power / 8Ω
Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
Potential Frequency Response: 5Hz-200kHz
 

Again, as stated before, our technician has completely refurb'd this Kenwood KM-206, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps, with never a complaint. Includes an 'e-copy' pdf download of the Kenwood KM-206 owners / users / instruction manual Unit looks, works and sounds great! Unit measures 16.5" wide x 10.5" deep x 4.75" high and weighs 20 lbs unpacked. Includes our standard 90 day limited warranty.
KENWOOD KM-206
Cond. 8.5++
$399.

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

 

b&k_av2500_5-multi-channel_av_amplifier_web.jpg      b&k_av2500_5-multi-channel_av_amplifier_collage.jpg

          NEW LISTING 8/24/12
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CheckMarkSmall_web.jpg (792 bytes) warranty
B&K MULTI-CHANNEL
AV2500
5-CHANNEL
AUDIO / VIDEO POWER AMPLIFIER
#...4826

Circa 19
95

  "WORLD AC POWER"
MADE IN USA

for sale
We have complete gone through this unit and bench checked / tested it. Amp has been cleaned inside and out. All input level pots cleaned for static free performance. Internals inspected, transformer secondary's tested and our technician has completely Certified this amp. All functions have been tested and pass with flying colors!
Amp designed using Huge 'Torroidal' Power Supply Transformer. Super quality all around. From the original OM, "
The high quality parts complement include state-of-the-art solid state devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity toroidal transformer". All 5 inputs and all 5 outputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous high volume for 4 hours straight and it functioned flawlessly.
   

   On our test bench, each of this particular unit's (#...4826) FIVE (5) amplifiers produced 21.2 Volts at 8 Ohms per channel for 56 Watts / channel and 17.7 Volts at 4 Ohms per channel for 78 Watts / channel (4 Ohm operation not recommended) via discrete output transistors (5x LM3886T. (Idle AC current draw @ .38A. DC offset / out <2mV each channel.
   

   Great condition, late model, 5-Channel power amp by B&K. Model B&K AV2500. VERY versatile unit. 5-inputs and 5 outputs, Stereo and Mono Line outputs, bridge-able and more. Excellent for feeding multiple rooms / speaker systems or for use in an A/V system. Lots of punch and headroom.
   Features:
   

   - 5- Channel operation
   - 5 Discrete inputs and 5 Discrete outputs
   - 'Bridge-able' into ONE big power amp
   - Built-in Protection circuit
   - LED Status indicators
   - RCA input jacks
   - Oversize torroidal power supply transformer
- Heavy duty binding posts (can use 'single' bananas, but not standard banana pair spacing)
- Gold Plated Connectors - Improve connections for better sound and minimized signal loss and degradation.
- 1% Metal Film Resistors - Low noise resistors for better sound and a greater degree of repeatability.
- High Current - Ability to reproduce demanding recordings.
- Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors for extended low frequency control and improved dynamics.
- Protection from accidental shorting of output
devices and protection from thermal overload.

   - Externally located 'mains' fuse
- 5-24VDC Control input voltage and 12VDC control voltage output (comes with 'shorting' cable to enable amp function without any corresponding control voltage in.)

-
True "
WORLD AC POWER"™ allows unit to be operated on 50 or 60 Hz AC and will select voltages from 110v, 120v, 220v and 240 Volts AC input.

 

Also from the OM;  
"The most obvious function for the AV2500 series II is to take five separate
audio inputs and provide five separate amplified outputs. Your AV2500
series II has arrived set up in this configuration.

- With the inputs buffered, a line output (OUT BUS) may be taken from
either the L BUS, R BUS, or L+R BUS and sent on to another amplifier.
This allows for linking of multiple amplifiers.
- Continuing its versatility, the AV2500 series II may be used mono to
provide one, high current channel in order to drive a speaker requiring
more power.
- As a result of the AV2500 series II’s unique bus system, the input to
channels 4 and 5 may be inverted thereby allowing the possibility of
creating a single high voltage (bridged) channel from one source, through
the left bus."


Many more features, listed in the user manual, way too numerous to mention.

 Original B&K AV2500 Specifications
(2500II specs, but essentially the same amp):
 "60 Watts per channel minimum RMS, @ 8Ohms, 1k, with no more than 0.09% THD"
   Design type: 5 Channels, Class-A/B operation
Input Sensitivity: 0.77V
Input impedance: 33.2k Ohms
THD; 0.09% @ 1kHz
   Power Bandwidth: 5Hz-45kHz
Slew Rate; 14V / mSec
Damping Factor; 80 / 8 Ohms
Signal / Noise; 95dB A weighted
Dynamic Headroom; 1dB
Max Power Consumption; 450 Watts
 
    
 Again, as stated before, our technician has completely gone thru this B&K AV2500, multi-channel Power-Amp, cleaning and testing all and it gets our full 'Certification'. Overall amp in great cosmetic condition, with only minor wear to the top cover. Unit looks, works and sounds great! Includes a pdf 'e' copy of the B&K AV2500 owners / users manual. Unit measures 17" wide x 12" deep x 3.75" high and weighs 23 lbs unpacked. Includes our standard 90 day limited warranty.
B&K AV2500 MULTI-CHANNEL POWER AMPLIFIER
Cond. 8.5
$599.

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

   

 

  


Did you know?
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 .
 

 

 


 


INTEGRATED AMPS:
 

         

        NEW ADDITION 11/16/17
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REFURBISHED / SERVICED
VINTAGE ONKYO STEREO INTEGRATED AMPLIFIER
ONKYO A-7040
STEREO INTEGRATED AMP

#...0899
Circa 1979-81

MIJ
for sale

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

ü  Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing fine.

ü Silicone heat sink compound inspected for ‘suppleness’

ü Output section bias / DC offset adjusted to factory spec.

ü All functions tested for perfect operation.

ü All inputs and functions tested.

ü Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent!

ü Following electronic refurbishing, the entire unit was cosmetically detailed

ü 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.

While this amp was originally rated at 50 WPC on our test bench the internal amplifiers of this particular unit, #...0899, produced 25 Volts per channel at 8 Ohms for 78 Watts per channel and 21 Volts at 4 Ohms for 110 Watts
per channel via discrete, outputs (2x Toshiba 2SA1105 & 2x 2SC2580)
Idle current draw .75A
DC out measured following bench service at only 1.2mV!!! on either side
Very quiet with Floor noise measured at 0.0 mVAC.
   
____________________________
   
Great performing and 'classic' looking Onkyo A-7040 Integrated Amplifier. Great unit to provide the heart of a medium to mid-large sized Hi-Fi system. Unit looks, works and sounds great!
Onkyo A-7040 Features include:
  

- Discrete Output, Class A-B Amplifier design 
- Speaker A, B, A+B, Off selector
- Separate Bass and Treble controls featuring high-quality, de-tented controls
- I/O jacks and Speaker output posts feature 'Point to Point' wiring, so connections are 'stress free' on the circuit boards (all gear should be designed like this, but its 'too expensive' for most of the general public now

- Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape Dubbing Capability
- Dual Phono / Turntable inputs
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc. inputs)
- Hi filter for reducing tape hiss / electronic hiss & noise- and record static
- Loudness control. "Loudness" functions to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound
- 1/4" stereo headphone jack
- External Speaker protection fuses
- Dual AC Convenience outlets (1 switched and 1 un-switched) with a total capacity of 200 Watts

   
Original Onkyo A-7040 Specifications:
   
Design type: 2 Channel, discrete output, Class A-B
POWER AMP SECTION:
Freq Response of power amp section;
 15Hz-50kHz
Damping factor; 45 @ 8Ω full bandwidth (means VERY TIGHT bass response)
Signal / Noise; 90dB
Cont rated Power: 2x 50 Watts @ 8 Ohms / 1kHz
THD;
0.026% @ 50Watts & 8 Ohms from 20-20kHz

PRE-AMP SECTION:
Signal / Noise;  90dB @ Tuner / Tape 'shorted'
Input Sensitivity Tuner / Tape @ RCA's; 150mV @ 50kΩ
THD; 0.026% at rated ouput
Bass Control;  ±10dB @ 100hz
Treble Control;  ±10dB @ 10khz
Hi-Filter; 6kHz & 6dB/Oct
Loudness Control; +5dB @ 100Hz & +5dB @ 10kHz(-40dB VOL)

PHONO SECTION SPECS;
Freq Response;
20-20kHz ±0.5dB
S/N; >80dB!!!, IHF-A
Input Sensitivity; 2mV @ 50kΩ
Overload limit; 170mV @ 1k w/ 0.026% THD

 

Again, as stated before, our technician has completely refurb'd this Onkyo A-7040 Stereo Integrated amplifier, cleaning and testing all and it gets our full 'Certification'. All functions test perfectly. Great integrated for just about any stereo system from med to medium large speakers. This is a fabulous amp. Sonically superb following our techs work. Very musical. Lots of solid power / punch. Unit looks good and sounds great! Can include a pdf 'e' copy of the Onkyo A-7040 Service Manual if the new owner so desires. Measures 16.5" wide x 15.7" deep x 5" tall and weighs 21 lbs unpacked. Includes our 90 day limited warranty.
Onkyo A-7040 Stereo Integrated amplifier
Condition 8.5
$399.
(C) R.R.


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

 

 

 

 

 

         

NEW ADDITION 5/21/18
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REFURBISHED / SERVICED
VINTAGE
FISHER INTEGRATED POWER AMPLIFIER
FISHER CA-271 (CA-1271)
STEREO INTEGRATED AMPLIFIER

#...8505
Circa late 1980's
MIJ
for sale


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

ü  Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing fine.

ü Silicone heat sink compound inspected for ‘suppleness’

ü Output section bias / DC offset adjusted to factory spec.

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

ü 'Meter' illumination bulbs replaced with new, and balance of indicators checked

ü All functions tested for perfect operation.

ü All inputs and functions tested.

ü Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent!

ü Following electronic refurbishing, the entire unit was cosmetically detailed

ü 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.

On our test bench, each internal amplifier of this particular unit, #...8451, produced peak power of 34
Volts @ 8Ω per channel for 144 Watts / channel and 28 Volts @ 4Ω per channel 196 Watts / channel via 4 discrete, Toshiba output devices at 1khz. (2x 2SA-1095 & 2X 2SC2565). AC Idle current at .5A.  DC offset adjusted to <.5mV!!! L&R.  Floor noise <0.1mVAC.
____________________________

We've had three of these, and got over 'being surprised' by their performance. This Fisher CA-271, Integrated Amplifier was a 'sleeper' when we originally acquired it. We thought they were too 'recent' to bother with, but then we did our preliminary tests and quickly changed our opinion. Once our tech got finished with it, we were thoroughly surprised and impressed. They always have a lot of punch and headroom (check our bench test results above against it's original specs) and are VERY MUSICAL sounding. Large internal power supply, relative to most amps in it's range. Unit looks good with minor, typical wear, mostly to edges. Nothing distracting.

 
____________________________

Fisher CA-271Features include:

- 5-Band, 'Graphic' EQ with centers as follows: 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz.
- Independent speaker selector switches for A, B, A+B, Off
- Phono / Turntable input with Built-In Phono Pre-Amp
- Tape-1 monitor (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR {CD recorders} ) BUT since ‘TAPE-1’ is a ‘Tape Input’ and not a ‘Tape Monitor / Loop’ it CANNOT BE USED for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Aux / ‘Video Sound’ input
(can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®)
- Loudness for enhancing Bass and Treble response at lower volume levels
- Dual 7-Segment, LED Level Meters
- Meter Range Selector
- 2-Pin, DC power output for other Fisher components from that series that was 'proprietary'.
- Front mounted, ¼”, Stereo headphone jack

Original FISHER CA-271 Specifications:

AMP SPECIFICATIONS:

Power output: 100WPC min RMS @ 8 Ohms & no more than 0.05% THD @ 20-20kHz
THD; <0.05% @ full rated power
IHF IMD; 0.05% @ full rated power & 8 Ohms
Freq Response of power amp section: 20Hz to 20kHz w/ deviation of ±0.2dB
Damping factor; >20 @ 8Ω / 1kHz
Signal to noise ratio: 90dB (line)
Input sensitivity - Phono / All Others:
2.5mV (MM) /  150mV (all at 50kΩ)
EQ with centers as follows: 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz.
Loudness Control;
+8dB @ 100Hz  and +4dB @10kHz
Max Power Consumption;
480 Watts

PHONO SECTION SPECS;
Freq Response;
20Hz-20kHz w/ RIAA deviation of ±0.2dB
S/N; >70dB
Input Sensitivity; 2.5mV @ 50kΩ
Phono Overload; 125mV


Again, we have done the previously stated refurbishment / restoration work on this unit to insure it's performance, and it gets our full 'Certification'. All functions tested for perfect operation. Performs and sounds great! This unit will also supply power to many 'proprietary Fisher' units from this series, such as Fisher Tuners and Cassette Decks.
 We can include an 'e' copy, PDF of the Fisher CA-271 / CA-1271 Service manual if the purchaser wishes. Measures
17.25" wide x 4.25" tall x 10.5" deep and weighs an impressive 20 lbs unpacked.
Includes our standard 90 day limited warranty.
 
Cond. 8.5
FISHER CA-271 INTEGRATED AMPLIFIER
$279.

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

 

 

 

 



 


 

 


SOLD ITEMS BELOW


 


TO SEE OUR ARCHIVE OF SOLD AMPS & PREAMPS CLICK HERE
 

    



        NEW LISTING 3/21/18

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CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE PIONEER STEREO INTEGRATED AMPLIFIER
PIONEER SA-7800 / SA7800
'BATTLE WORN' COSMETICALLY, BUT
TECHNICALLY, A

NON-SWITCHING, 'CLASS-A LIKE' POWER HOUSE

 #...3645S
Circa 1978-'80
MIJ

SOLD 6/12/18
SHIPPING TO MIKE IN MARYLAND


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

ü Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls.

ü Bias adjusted to correct spec.

ü Meters calibrated per service manual.

ü Switches and controls now clean sounding and performing solidly.

 
ü All functions tested for perfect operation.

ü All inputs tested and both side produces clean and even sine waves!

ü No power supply hum of any kind. It's dead silent!

ü Following electronic refurb, entire unit was cosmetically detailed (as it 'practically' allowed).

Classic brushed aluminum face plate with the original aluminum knobs (volume knob may be a replacement).
This unit does have a few 'battle scars'. Besides the fairly typical 'finish peel', there's some 'clouding' thru the finish on the meter bezel, and some 'light spots' across the face plate that nothing seemed to effect (It's not a 'beauty contest winner' but not 'offensive', see photo collage above). Following 12+ hours of 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.
     
On our test bench the internal amplifiers of this particular unit, #...3645S, produced 26 Volts per channel at 8 ohms for 84 Watts per channel and 23 Volts at 4 ohms for 132 Watts per channel via discrete outputs (2x 2SA1075 & 2x 2SC2525)
Idle current draw .3A.
 DC out measured at <25mV on either side.
Very quiet with Floor noise measured at <00.1mVAC.
    
____________________________
 
Very classy silver face / Blue Florescent power meter integrated amp. Will match great with Pioneer Cassette Decks and Reel to Reel decks utilizing their famous "Blue" meters. 
Barring it's cosmetic blems it's a Great amp for home or project recording studio use.

Pioneer SA-7800 Integrated Amplifier TECHNICAL Features include:

- 'Non-Switching' amp utilizes 'super linear output transistors' with 'high range switching to reduce switching noise distortion associated with many 'Class A-B' amp designs.
This essentially gives you Class-A sonics, but without all the heat of a true Class-A amp design. It however eliminates the 'switching noise' present in many "A-B" designs (spelled out in detail in the original Pioneer SA-7800 sales brochure, compliments of www.hifi-manuals.com )
- 'DC 'Flat' Amp' eliminates capacitors in the signal chain, thus reducing 'lag' in the signal prior to hitting the power amp
- Gold plated Relay contacts in speaker protection circuit designed to last a lifetime (and I can tell you that 'relay contacts' are an 'issue point' on many amps / receivers we service. If they were all 'gold plated' it would certainly save some 'headaches').
- Super thin cut heat-sink fins for more efficient cooling.
- Pure copper leads on many of the board mounted components (these are not easy to source from a manufacturing standpoint typically)

- Tone Controls with a 'true bypass' when in their '12:00 Noon' position (although there's also a 'Tone Defeat' switch).
- Separately fastened RCA I/O jacks with 'point to point' internal connections


Pioneer SA-7800 Integrated Amplifier Features and 'Creature Comforts' include:


- Produces full power into only '8 Ohms' (most amps can only produce their full power potential into 4 Ohms)
- DC surge and Short Circuit protection built-in 
- Classic Pioneer, Dual Blue Florescent power meters
- Speaker selector for A or B, A+B or Off 
- Subsonic filter with 15Hz cut-off built-in for cutting turntable rumble
- Super quality de-tented volume control
- Tone Defeat for purest tone path if so desired
- Separate Bass and Treble with high quality de-tented controls
- Loudness function (boosts EQ on Bass and Treble, while cutting mids for a fuller sound at lower volume levels)
- 'Stereo / Mono' / Reverse Stereo selector
- Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Bi-Directional Tape Duplication
- Phono / Turntable input w/ 'Built-in' phono pre-amp
- 'Phono Interference Filter' reduces RFI from external sources
- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS® etc.)
- AUX input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS®, audio mixers, computer sound-cards etc.)
- Front mounted 1/4" stereo headphone jack
- -20dB Audio Muting
- Back panel features full RCA patch bay for all inputs (each 'fastened separately' to the rear panel, and 'point to point' wired internally, instead of being soldered directly to the circuit board, which is always a 'failure point').
- "spring-clip"  speaker connectors for A&B speakers
-
2 Switched and 2 un-switched AC outlets for a maximum load of 400 Watts of external gear.

 
Pioneer SA-7800 Original Specifications:
 
 "
Continuous Power output of 65 Watts per channel, min. @ 8 Ohms from 20Hz to 20kHz @ <0.009%THD or 65 Watts per channel, min. @ 4 Ohms from 20Hz to 20kHz @ <0.009%THD." (15W more than the SA-708 @ 4 Ohms)
 
Design type: 2 Channels, Integrated Pre /
Class AB operation Power Amplifier
Power Output: Continuous power output, 10Hz-50,000Hz;
65W/Ch THD 0.02% @ 8 Ohms
85W/Ch THD 0.03% @ 8 Ohms

Damping Factor: >55 @ 20-20kHz into 8Ω (15 more than the SA-708)
  S/N: 110dB for 'non-phono' inputs (10dB more!!! than the SA-708)
IMD; 0.003% at half rated power into 8Ω w/ 20-20kHz
  Freq Response: 10Hz-50kHz at full rated power
Input Sensitivities 'non-phono' inputs for full rated output: 150mV / 50KΩ via RCA's
Output at Tape Monitors: 150mV via RCA's
Bass Control;  ±10dB @ 100Hz (SA-708 is only 7.5dB cut / boost)
Treble Control;  ±10dB @ 10kHz  (SA-708 is only 7.5dB cut / boost)
  Subsonic Filter;  -6dB / oct @ 15Hz
 Loudness;  +6dB @ 100Hz & +3dB @ 10kHz w/ vol set at -40dB
Input Freq Response range (non phono inputs): 5-100,000Hz

 
Phono Section:

Freq Response: 20Hz-20kHz RIAA EQ
S/N: 87dB
Phono THD: 0.003% @ 1kHz
Phono MM Sensitivity: 2.5mV / 50kHz
 Phono MM Maximum Input Level: 200mV RMS while still maintaining 0.003% THD @ 1kHz

 
Again, as stated before, our technician has completely refurb'd this Pioneer SA-7800 Integrated Stereo Amplifier, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original brushed aluminum, Face and knobs are in beautiful condition. Unit looks beautiful and sounds great with what the restoration tech called "Gutsy" power & punch! Just FYI, this Pioneer SA-7800 has considerably better specs than it's little brother, the SA-608 / SA-6800 and certainly it's 'alter ego' SA-708,
(check S/N, tone controls and damping factor particularly).
Comes with an 'e' copy / pdf download of the original Pioneer SA-7800 owners / users manual and brochure if purchaser so desires. Measures 16.5" wide x 14.75" deep x 6" tall and weighs 27.5 lbs unpacked. Includes our 90 day limited warranty!
Pioneer SA-7800 INTEGRATED AMP
Cond. 7.5-8 (due to cosmetic blems)

SOLD 6/12/18
SHIPPING TO MIKE IN MARYLAND

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

 

 

     

NEW LISTING 4/13/18
 (Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE REALISTIC STEREO INTEGRATED AMPLIFIER
REALISTIC SA-2000

 #...1087
Circa 1977

MADE IN JAPAN
(Not Taiwan or Korea like a lot of 'vintage' Realistic gear)

for sale
SOLD 5/25/18
SHIPPING TO STEVE IN CONNECTICUT


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

ü Following ext / int visual inspection entire unit was cleaned inside and out

ü All three 'control' PCB's removed to allow cleaning of ALL contacts, switches and control pots.

ü Bias adjusted to correct spec.

ü Switches and controls now clean sounding and performing solidly
(only exception is the 'High Filter'. It's 'lock' is a bit 'finicky' so if you want to 'bypass' the Hi-Filter, you need to engage it rather 'solidly' to get it to lock (stay in) ).

 
ü All functions tested for perfect operation.

ü All inputs tested and both side produces clean and even sine waves!

ü No power supply hum of any kind. It's dead silent!

ü Following electronic refurb, entire unit was cosmetically detailed (It's BEAUTIFUL!!!).

This is first and only one Realistic SA-2000 we've had in 23 years. Classic brushed aluminum face plate with the original aluminum knobs.
 Following 12+ hours of 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.
Total technician time to restore 8 hours. (Tech noted on work sheet, "VERY nice build quality inside and out. Mint condition")

     
On our test bench the internal amplifiers of this particular unit, #...1087, produced 24 Volts per channel at 8 ohms for 72 Watts per channel and 20 Volts at 4 ohms for 100 Watts per channel via discrete, TO-3 / Metal Cased outputs (Toshiba 2SD426) (test at 1kHz, single channel at a time).
Idle current draw 0.425A.
Very quiet with Floor noise measured at <00.0 mVAC / ->60dBm.
    
____________________________
 
Probably the best Integrated amp Realistic ever did (certainly was up until 1977, and after 1980, who cares). This is a great looking unit, with a classy 'Champaign' color, brushed aluminum face, and a 'REAL' wood veneer bonnet.
Just the right features & sonically magnificent!
Great amp for home or project recording studio use.


Realistic SA-2000 Integrated Amplifier Features and 'Creature Comforts' include:


- Discrete output power amplifier section
- "Perfect Loudness" control couples 'gain' and 'Volume' controls allow you to adjust loudness compensation to your exact preference (similar to Yamaha's Variable Loudness).

- Speaker selector for Main or Remote, A+B or Off 
- Separate Bass, Mid and Treble with high quality de-tented controls
- Selectable Tone Control turnover centers
Low-Freq: 400Hz or 125Hz
Hi-Freq: 3kHz or 7kHz

- "Perfect Loudness" function w/ 'Variable Preset Level' (boosts EQ on Bass and Treble, while cutting mids for a fuller sound at lower volume levels in relationship with the 'Volume' controls)
- Dual Analog, back lit, 'd'Arsonval' movement, VU Power Meters
- 'Stereo / Mono'  selector
- Built-in Low / Subsonic Filter to eliminate excess rumble from sources such as turntables
- Hi filter for reducing tape hiss / electronic hiss & noise- and record static
- Dual Tape Monitor Loops (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Dual 'Magnetic' Phono / Turntable inputs w/ 'Built-in' phono pre-amp
- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS® etc.)
- AUX input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS®, audio mixers, computer sound-cards etc.)
- Front mounted 1/4" stereo headphone jack
- Back panel features full RCA patch bay for all inputs (each 'fastened separately' to the rear panel, and 'point to point' wired internally, instead of being soldered directly to the circuit board, which is always a 'failure point').
- 'Screw Type' speaker connectors for A&B
speakers (also gives a pair of RCA connectors for speakers)
-
1 Switched and 1 un-switched AC outlets for a maximum load of 300 Watts of external gear.

 
Realistic SA-2000 Original Specifications:
 
 "
Continuous Power output of 55 Watts per channel @ 8 Ohms 20Hz to 20kHz @ <0.3%THD. Dynamic Power is much more!!!
 
Design type: 2 Channels, Integrated Pre /
Class AB operation Power Amplifier
Power Output: Continuous power output, 20Hz-20,000Hz;
55 W/Ch THD 0.3% @ 8 Ohms

Freq Response: 20Hz-20kHz at full rated power
S/N: 75dB @ AUX
Lo Filter:
70Hz
Hi Filter: 10kHz
 
Phono Section:

Freq Response: 20Hz-20kHz RIAA EQ
S/N: 60dB @ PHONO
Phono MM Sensitivity: 3mV
Phono Overload: 160mV

Again, as stated before, our technician has completely refurb'd this Realistic SA-2000 Integrated Stereo Amplifier, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original brushed aluminum, Face and knobs are in beautiful condition. Unit looks beautiful and sounds great with what the restoration tech called "Gutsy" power & punch!
Measures 16" wide x 12.5" deep x 4.75" tall and weighs 21 lbs unpacked. Includes our 90 day limited warranty!
REALISTIC SA-2000 INTEGRATED AMP
Cond. 9+
 (C)
R.R.
SOLD 5/25/18
SHIPPING TO STEVE IN CONNECTICUT

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

 

 

 

 

Kenwood_KM-208_Power-amplifier_web.jpg       Kenwood_KM-208_Power-amplifier_collage.jpg

NEW LISTING 9/19/17
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED
RESTORED / REFURBISHED / FULLY SERVICED
VINTAGE
KENWOOD POWER AMPLIFIER
KENWOOD KM-208 / KM208 AMP
600+ WATT MONSTER!!!
#...2664
Circa 1985-86
MIJ

SOLD 10/30/17
SHIPPED TO MICHIGAN

Our technician has completely gone through and 'Certified' this unit. Unit bench checked / tested. Amp has been cleaned inside and out. Face removed, meter illumination lens removed, cleaned and reattached. All new panel illumination lamps replaced with new. All functions have been tested and pass with flying colors!
Amp designed using Huge Power Supply Transformer and oversized, vertical finned heat sink for very efficient and silent, passive cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 72 hours straight and it functioned flawlessly.
   

While this amp is originally rated at 150 Watts with both channels driven (310W + 310W "Peak Music Power"), on our test bench, this particular unit's (#...2664) amplifiers produced 37 Volts at 8 Ohms per channel for 171 Watts / channel and 30 Volts at 4 Ohms per channel for 225 Watts / channel via discrete output transistors (2x 2SA1216 & 2x 2SC2922. (Idle AC current draw @ .4A.
DC offset out L= 16.5mV & R= 10.5mV.
Floor noise measured at L= 00.0mVAC and R=00.1mVAC / -60dBm
   

Great, later model power amp by Kenwood. Model KM-208. HUGE power output! Excellent for 2-channel (stereo) audio listening or for use in an A/V system. Lots of punch and headroom.
Kenwood KM-208 Features:
   

   - 2- Channel stereo operation
   - A or B speaker selector via high current relay
   - Dual, Vertical, 7-Segment LED Power Output Meters with Dual Position Level Selector
   - Built-in Protection circuit
   - LED Status indicators
   - Front-mounted 1/4" stereo headphone jack
   - RCA input jacks
   - Dual, vertical finned internal heat sink
   - Oversize power supply transformer
   - 3 Rear-mounted AC convenience outlets (2 switched and 1 un-switched for a total capacity of 200 Watts)

   
Kenwood KM-208 Original Specs:
 "150 Watts per channel minimum RMS, both channels driven @ 8Ohms, 20-20k, with no more than 0.015% THD"
   Design type:
2 Channels, AB operation
 Damping Factor @ 1kHz / 8Ω: 35
  Rated RMS Output: 150 Watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz.
Music Power 314 Watts per channel
THD; 0.015% @ half rated power / 8Ω w/ 20-20kHz
0.001% @ half rated power / 8Ω w/ 1kHz
IMD; 0.002% @ rated power / 8Ω
   Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
   Potential Frequency Response: 5Hz-200kHz
Damping Factor; >35 @50Hz / 8 Ohms
Signal / Noise; 120dB A weighted
 

     Again, as stated before, our technician has completely refurb'd this Kenwood KM-208, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps, with never a complaint. Includes an 'e-copy' pdf download of the Kenwood KM-208 owners / users / instruction manual Unit looks, works and sounds great! Unit measures 16.5" wide x 10.5" deep x 4.75" high and weighs 20 lbs unpacked. Includes our standard 90 day limited warranty.
KENWOOD KM-208
Cond. 8.5

SOLD 10/30/17
SHIPPED TO MICHIGAN

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

 

 

      



NEW LISTING 3/21/18
 (Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE KENWOOD INTEGRATED AMPLIFIER
KENWOOD KA-6100
#...1974
Circa 1976-78

MIJ 
SOLD 3/26/18
SHIPPED TO TEXAS


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

ü Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls.

ü Heat sink compound still supple

ü Bias and DC offset adjusted to within spec.

ü Switches and controls now clean sounding and performing solidly.

 
ü All functions tested for perfect operation.

ü All inputs tested and both side produces clean and even sine waves!

ü No power supply hum of any kind. It's dead silent!

ü Following electronic refurb, entire unit was cosmetically detailed.

 All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Unit looks great with only a couple of minor tics / scuffs along the every top and bottom, face edge (see photos above). Great looking brushed aluminum face plate with the original aluminum knobs. 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.

     
While this amp was originally rated at 50 Wpc, on our test bench the internal amplifiers of this particular unit, #...1974, produced 24 Volts per channel at 8 ohms for 72 Watts per channel and 20 Volts at 4 ohms for 100 Watts per channel via discrete, TO-3, metal cased outputs (2x Sanken 2SA980 & 2x 2SC2260)
  Idle current draw  0.6A.
DC out measured at <35mV on either side.
Very quiet with Floor noise measured at >-60dBm
    
____________________________
    
Great performing and 'classic' looking Kenwood Integrated Amplifier. Great unit to provide the heart of a medium sized Hi-Fi system. Unit works well and sounds great!

Kenwood KA-6100 Features include:
   

- Discrete Output, Class A-B Amplifier design 
 - Speaker A, B, A+B, Off selector
- Separate Bass and Treble controls featuring high-quality, de-tented controls
- "Tone Defeat" function allows Tone control circuitry to be bypassed for purest signal path
- Dual tape deck monitors w/ Tape 'B' featuring both RCA and DIN I/O's (Tape Monitors (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS® etc.) (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
- Phono / Turntable input
- AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS® etc.)
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc. inputs)
- Subsonic filter @ 12dB / OCT for reducing turntable rumble
- Loudness control. "Loudness" functions to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound
- Dual analog VU power level meters w/ selectable range
- 1/4" stereo headphone jack
- Triple AC Convenience outlets (2 switched and 1 un-switched) with a total capacity of 400 Watts

    
Kenwood KA-6100 Original Specifications:
    
Design type: 2 Channel, discrete output, Class A-B
Damping Factor : >50
IMD; 0.02% w/ Tuner In / Spkr Out @ 20w / 8ohms.
Rated RMS Output:
50 Watts per channel, min. RMS, at 8 ohms, both channels driven, from 20Hz to 20kHz @ 0.03% THD
Input Bandwidth (non-phono):
10Hz-50k
S/N on Phono MM w/ 5mv signal:
92dB
Phono MM Sensitivity:
2.5mv / 47kOhms
Phono MM Maximum Input Level:
230mv
High Level Sensitivity (tuner, Aux, Tape):
150mv
  

Again, as stated before, our technician has completely refurb'd this Kenwood KA-6100 Integrated Stereo Amplifier, cleaning and testing all and it gets our full 'Certification'. Great control / pre-amplifier for just about any stereo system / power amp. Unit looks good and sounds great! 
Comes with an 'e' copy / pdf download of the original Kenwood KA-6100 owners / users manual. Measures 17" wide x 14.5" deep x 6" tall and weighs 26 lbs unpacked. Includes our 90 day limited warranty.
Condition 8.5
Kenwood KA-6100 Integrated Amplifier
 (C)
R.R.

SOLD 3/26/18
SHIPPED TO TEXAS

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

 
    

NEW LISTING 9/21/17 
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
YAMAHA CA-410-II
YAMAHA STEREO INTEGRATED AMPLIFIER
 #...1659
Circa '78-'79
MIJ

SOLD 10/18/17
SHIPPED TO CALIFORNIA


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

ü  Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls.

ü  Bias and DC offset checked and / or adjusted to correct spec.

ü  Meters calibrated per service manual.

ü  Meters illumination lamps replaced

ü  Switches and controls now clean sounding and performing solidly.

 
ü  All functions tested for perfect operation.

ü  All inputs tested and both side produces clean and even sine waves!

ü  No power supply hum of any kind. It's dead silent!

ü  Following electronic refurb, entire unit was cosmetically detailed.

Great looking brushed aluminum face plate with the original aluminum knobs. Following 12+ hours of 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.

     
While this unit was originally marketed at 25 Watts / channel, on our test bench the internal amplifiers of this particular unit, #...1659, produced 21 Volts per channel at 8 Ohms for 55 Watts per channel and 17.1 Volts at 4 Ohms for 73 Watts per channel via discrete outputs (2x 2SB686 & 2x 2SD716
Idle current draw .25A.
DC out measured at <13mV on either side.
Very quiet with Floor noise measured at <00.1mVAC / -60dBm.
    
____________________________

 
One of the classics from Yamaha! An early series of Yamaha's audio gear. Beautiful brushed solid aluminum front panel with all original aluminum Yamaha knobs intact.
 
  Yamaha CA-410-II Features are:
  
- Dual-band EQ with super quality de-tented controls
- Hi filter for reducing FM pilot tone and extraneous FM stereo noise
- Treble centered @ either 10kHz
- Bass centered @ 50Hz
- Yamaha's exclusive "Variable Loudness" control
- Speaker selector for A or B, A+B or Off
- Dual tape deck inputs / outputs
- Record-Out selector allows listening to one source while recording another
- Phono input
- Aux (can also be used for Video / CD / DVD / VCR / DAT / MP3 / XM / SIRUS etc.)
- Dual analog power Watt meters
- 1/4" Stereo Headphone Jack

  
Again, following the above refurbishment by our senior tech, this amp is READY TO GO!
The unit looks, sounds and works wonderfully.
Includes a pdf 'e' copy of the Yamaha CA-410-II owners / users manual and if the purchaser desires, the 'service manual' as well. Amp measures 17.25" wide x 13.75" deep x 5.25" high and weighs 19 lbs unpacked. Includes our standard 90 day limited warranty.
YAMAHA CA-410 II
Cond. 8.5+

SOLD 10/18/17
SHIPPED TO CALIFORNIA

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

   

 

 

Audio_Centron_RMA_1000_Stereo_Amp_web.jpg       Audio_Centron_RMA_1000_Stereo_Amp_collage.jpg

      NEW LISTING 11/27/07
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty

PRE-OWNED
AUDIO CENTRON / SLM
POWER AMPLIFIER
RMA-1000 RMA1000

PROFESSIONAL / STEREO
STABLE INTO 2 Ohms!
MADE IN THE USA!
Circa 1986-94

SOLD 3/29/17
SHIPPED TO IOWA

This is a REAL, 'old skooool' built, CLASS A/B power amp. NOT class d, class g, class t or whatever class marketers are calling them this week, to be the lightest and cheapest amp you can buy, that weighs a couple lbs, but a REAL amp. It's got SIXTEEN output transistors in it!

2 rack space, Audio Centron, RMA-1000 power amplifier. Great for small "All-in-One" speakers, stage monitors, wedge monitors or running horns or mids in a Bi-Amp / Tri-Amp system or for running Low end / subs in mono-mode.

Features:

- Stable down to 2 Ohms!
-
- Power rated as follows;
8 Ohms = ~100 wpc
4 Ohms = 150 wpc
2 Ohms = 220 wpc

- 2-Rack spaces high with built-in rack ears and carry handles
- Cooling fan for those demanding "2 & hard 4 ohm conditions"
- Relay protection against "turn-on / turn-off" transients
- Dual, Front mounted, independent input attenuators
- Dual, LED Signal, Limit and Protect indicators
- Thermal protection with "Fault" LED indicators

- XLR and 1/4" phono input signal I/O's
- Speaker outputs via 3-Way binding / banana posts and 1/4", "all metal" phono jacks

- Stereo / Bridge-Mono selector
- "REAL" TO-3, Metal cased output transistors
- Rear mounted main AC fuse

- Grounded AC input cord


While this unit was originally rated at ~100 wpc @ 8Ω, on our test bench, both this unit's amplifiers produced
peak power of 30 Volts per channel for 112 Watts per channel @ 8 Ω via discrete output & 27.7 Volts per channel for 192 Watts per channel @ 4 Ω via eight discrete, Motorola, Metal cased, (TO-3) MJI5002 & MJI5001 outputs.

 Again, as stated before, our technician has completely refurb'd this Audio Centron RMA-1000, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Both speaker protection relays just replaced with new. We have completely gone through the unit cleaning and testing all. Unit works great. Only minor issue is that the "Channel B" input attenuator has a blank spot in the first 40% that does not respond to cleaning. Not an issue once you have amp up to operating level.  
SPECS:

- Stable down to 2 Ohms!
- Output Power ratings (stereo mode):

8 Ohms = ~100 wpc
4 Ohms = 150 wpc
2 Ohms = 220 wpc

- Bridge / Mono mode operation (440 Watts @ 4 Ohms)


On our test bench, both amplifiers produce perfectly clean and symmetrical sine waves at both 8 & 4 ohm loads. We tested both internal amplifiers to the above specs, and found them accurate.
This is a great performing, fan cooled amp.

On a personal note; I've actually been using this amp in my studio as a rehearsal amp, but can't really have any 'fan cooled' amps in that environment, so am going to have to go a different route.
Measures 19" wide x 16.5 overall depth / 13.5" rack depth x 3.5" tall and weighs 35 lbs unpacked. Includes our standard 90 day limited  warranty.
AUDIO CENTRON RMA-1000
Condition 8

SOLD 3/29/17
SHIPPED TO IOWA

 

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

 

 

 

    

           NEW LISTING 11/29/16
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE PIONEER POWER AMPLIFIER
PIONEER SPEC-4 POWER AMP
#...1420M

"WORLD AC POWER"
Circa 1977-79
M.I.J.
SOLD 6/14/17
SHIPPED TO GEORGIA


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

ü  Everything was cleaned inside and out including all switches, controls and contacts.  Cleaned and re-lubed all control shafts.

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

ü  ‘Multi-Voltage’ switch replaced and correctly set for North American current. 

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

ü  PC Molex connector pins burnished    

ü  All output transistors removed and individually tested. Fresh heat sink compound was used on re-installation, of course. 
 

ü  Driver Boards had their 'primary' electrolytic caps changed.     

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

ü  All functions tested for perfect operation.

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

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

ü  Following restoration procedures, the unit was run 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.

On our test bench, each internal amplifier of this particular unit, #...1420M, produced peak power of 38 Volts per channel at 8 Ohms for 180 Watts per channel and 28 Volts at 4 Ohms for 196 Watts per channel via discrete, TO-3 / Metal Cased output transistors (4x 2SB554 & 4x 2SD424).
AC Idle current at 750mA. DC offset adjusted to a SUPER LOW <1.0mVDC L&R & floor -60dB.

 
____________________________

One of the most sought after among the ‘vintage’ power amps of the audio world by Pioneer, the “SPEC-4” Power Amplifier. Super build quality, with great features. Works great, Sounds FABULOUS AND HUGE! Enough power to handle most any speaker you 'want to throw at it', and pretty much any size room you would might have. Conversely, enough power and detail down low for quieter listening situations. Unit does have a few small ‘dings / battle-scars’ on the right, front panel (see photos above). Fortunately it does make up for it in high performance!

Pioneer SPEC-4 Features Include:


- Dual AC Power Supply featuring quad 80V / 22,000 uF capacitors and two large, Pioneer Power Transformers

 


- 8x Discrete, TO-3 Output Transistors
- Direct Coupled Power Amp
- DC surge protection to protect your woofers from excessive ‘in-rush’ DC
- Short Circuit protection for output posts
- Low-impedance protection
- Separate Left and Right attenuators utilizing super quality de-tented pots
- Dual oversized, Analog, VU-Style power meters
- RCA / Phono Power Amp inputs
- True "WORLD AC POWER"™ 110V, 120V, 220V & 240V AC current


Original Pioneer SPEC-4 Specifications:

Power output: 150Wpc continuous RMS @ 8 Ohms & no more than 0.01% THD @ 20-20kHz
180Wpc continuous RMS @ 8 Ohms & no more than 0.03% THD @ 20-20kHz
Power Bandwidth: 20-20,000Hz
THD:
no more than 0.01% THD @ 20-20kHz at full rated power
IHF IMD: 0.01% @ full rated power & 8 Ohms & 0.005% @ 75Wpc
Freq Response of power amp section: 5Hz to 100,000 Hz @ 1W / +0dB, -1dB
Signal / Noise Ratio:  115dB w/ inputs shorted
Damping Factor: 100 @ 8 Ohms
Speaker Impedance: 16-4Ohms w/ 4 Ohms minimum
Input Sensitivity @ RCA's for rated output: 1V @ 50kΩ
Max power consumption: 760 Watts

Again, we have done the previously stated refurbishment / restoration work on this unit to insure its performance, and it gets our full 'Certification'. All functions tested for perfect operation. Other than the previously mentioned ‘battle scars’ on the face plate (see photos above), the unit is in good cosmetic condition. Performs and sounds great! This is a very ‘musical’ sounding amp with lot’s of punch! Includes a pdf, 'e' copy, download of the Pioneer SPEC-4 owners / users / instruction manual, the service manual as well as a full line 1978-1979 Pioneer Full Line Brochure (if the purchaser so desires). Measures 19" wide x 7.5" tall x 17.5" deep and weighs an impressive 54 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 9.5
Pioneer SPEC-4 Power Amplifier

(C) D.W.
SOLD 6/14/17
SHIPPED TO GEORGIA



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

 

 

    

        NEW LISTING 4/25/16
(Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE DYNACO PRE-AMP
DYNACO PAT-4
STEREO PRE-AMPLIFIER
#...5899
MADE IN THE USA!
Circa 1967-73

 
for sale
SOLD 1/24/17
SHIPPED TO GEORGIA
 
Our technician has completely gone through and 'Certified' this unit cleaning contacts, controls and pots. Replaced 'loose feeling' tape monitor switch with another original Dynaco pre-amp switch. Pots and switches are all super high quality. All functions tested perfectly. All original knobs intact and no bent control shafts.
 __________________________________
 
 
One of the classic, "old standby's" of the audio world. The Dynaco PAT-4 Pre-Amp. Brushed aluminum face with matching "milled" look knobs. This is also a VERY WELL DESIGNED & BUILT unit:
 
Dynaco Pat-4 features
:

- Separate L & R, Bass and Treble 
- Stereo-Mono switches to provide A or B channels independently or combined (A+B) with 6 dB blend for 3rd channel output
 - L / R Balance
- Tape Monitor input as well as Tape Head input for earlier tape decks (can also be used for Video / CD / DVD / VCR / DAT / MP3 / XM / SIRIUS etc. as well as for CDR)
 - Phono input
- Tuner input (can also be used for Video / CD / DVD / VCR / DAT / MP3 / XM / SIRIUS etc. as well as for CDR)
- High filter switch @ 15 KHz, 10 KHz, and 7 KHz
 - Low Filter selector
- SPARE (AUX) input for (CD / DVD /DAT / iPod / VCR / MP3 / XM / SIRIUS etc. inputs)
- RCA outputs for feeding power amp
- 4 AC convenience outlets on rear panel (2 switched and 2 un-switched)

 
Dynaco Pat-4
Original Specs:
Frequency Response:
High level inputs - ±0.5 dB from 10 Hz to 100 KHz,
Low level inputs - ±1 dB from 20 Hz to 20 KHz
Distortion at rated 2 volt output:
THD less than 0.05% 20 Hz to 20 KHz IM less than 0.05% with any combination of test frequencies
Hum and Noise: Magnetic Phono: 70 dB below a 10 mV reference signal High level: 85 dB below a 0.5 volt signal Gain: Magnetic Phono: 54 dB at 1000 Hz High Level: 20 dB
Tone Control Range: ±16 dB at 50 Hz ±12 dB at 10 KHz
Maximum Output: 10 Volts into high impedance; 5 Volts into 600 Ω .
Impedances: Magnetic Phono: 47,000 Ω
Tape Head: 100,000 Ω
High level: 100,000 Ω
Audio Output: 600 Ω
To Tape: From low level inputs, 600 Ω . From high level inputs, same as source
Amplifier input: Nominal load 10,000 Ω or higher
Inputs: Low level or high level RIAA magnetic phono or ceramic phono NAB 7-1/2" tape head Special (normally microphone) Tape amplifier, Tuner, Spare high level, or TV, etc.
Front panel high level Outputs: Tape input ahead of controls;
2 Audio outputs (one switched by front panel jack)

 

 This was from Dynaco's first series of solid-state audio components. Again, we have completely gone through the unit. One note about Dynaco Pat-4 pre amps is that, like a few other 'vintage' units, is due to the close proximity of the input jacks, you will need to utilize fairly 'normal' jacketed RCA connectors, as there is not enough room to 'squeeze' some of the 'fatter' RCA jacks (usually seen on 'high end' 'interconnects'). All functions have been tested and pass with flying colors! Minor scratches on top sheet metal cover and the only other issue is that the face panel does not have 'On-Off' silk-screened on it. It may never have had it, or it may have worn off. Pre-amp looks decent and sounds great. Includes an 'e-copy' pdf download of the Dynaco PAT-4 owners / users / instruction manual.
 Unit measures 13.5" wide x 9" deep x 4.5" high and weighs ~4 lbs unpacked. Includes our standard 90 day limited warranty.
 Cond. 8.5
SOLD 1/24/17
SHIPPED TO GEORGIA
(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 6/15/16
(Click on above thumbnails to enlarge photos)
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SANSUI INTEGRATED STEREO AMPLIFIER
SANSUI AU-717 / AU717
#...2735
"WORLD AC POWER" ™
  Circa 1977-79
M.I.J.
SOLD 1/12/17
SHIPPED TO WASHINGTON

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

ü  Everything was cleaned inside and out including all switches, controls and contacts.  Cleaned and re-lubed all control shafts.

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

ü  ‘Multi-Voltage’ switch replaced and correctly set for North American current. 

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

ü  All output transistors removed and individually tested. Fresh heat sink compound was used on re-installation, of course.

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

ü  All functions tested for perfect operation.

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

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

ü  Following restoration procedures, the unit was run 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.

On our test bench, each internal amplifier of this particular unit, #...2735, produced peak power of 28 Volts per channel at 8 Ohms for 98 Watts per channel and 23 Volts at 4 Ohms for 142 Watts per channel via discrete, TO-3 / Metal Cased output transistors (Sanken 2x 2SA747 & 2x 2SC1116).
AC Idle current at 500mA.
DC offset adjusted to a SUPER LOW <1.4mVDC L&R & floor noise 0.0 mVAC.
 
____________________________

 
One of the classic of the audio world by Sansui, the 'AU-717' Integrated Amplifier. Super build quality, with great features. This amp essentially looks NEW! Works great, Sounds FABULOUS AND HUGE! Enough power to handle about any speaker you 'want to throw at it', and pretty much any size room you would have. Conversely, enough power and detail down low for quieter listening situations.


Sansui AU-717 Features Include:


- Dual AC Power Supply featuring quad Nichicon 63V / 15,000 uF capacitors and two large, Sansui Power Transformers 
- Discrete, TO-3 Output Transistors
- Direct Coupled Power Amp

- A-B-A+B-& off speaker selector
- Separate Bass and Treble utilizing super quality de-tented pots
- Selectable Tone Centers w/ Treble at either 3kHz or 6kHz and Bass at 200Hz or 400Hz
- Tone Defeat selector for 'purest' signal path if desired
- Super quality de-tented Volume control pot
- Dual tape deck monitors (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® 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 with Source Monitoring
- Dual Phono / Turntable inputs w/ built-in Phono Pre-Amp
- AUX Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs)
- Loudness control. "Loudness" functions to boost Bass in relationship to Mid frequencies at lower volume levels for a much fuller sound

- Hi filter for reducing tape hiss / electronic hiss & noise and record static

- Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables

   - Instant -20db audio level muting
- Pre-Amp out / Power Amp input loop, w/ a 3-Way switch to allow 'internal connection' of the two. This enables you to utilize an 'additional' power amp, while still using the Sansui AU-717. It also lets you select between 'Direct Coupled' outputs or 'Cap Coupled' outputs.

- Front mounted 1/4" stereo headphone jack
- Triple AC convenience outlets on rear panel with 2 switched (250 watt combined)  and 1 un-switched (100 watt) for a total capacity of 350 Watts of accessories.
- True "WORLD AC POWER"™ 110V, 120V, 220V & 240V AC current


Original Sansui AU-717 Specifications:

POWER / PRE AMP SPECIFICATIONS:

Power output: 85 Wpc min RMS @ 8 Ohms & no more than 0.025% THD @ 20-20kHz
Power Bandwidth: 20-20,000Hz
THD:
no more than 0.025% THD @ 20-20kHz at full rated power
IHF IMD: 0.025% @ full rated power & 8 Ohms
Freq Response of power amp section: 0 Hz to 200,000 Hz @ 1W / +0 dB, -3 dB
Damping Factor: 60 @ 8 Ohms
Speaker Impedance: 4 Ohms minimum

PRE-AMP SECTION:
Signal / Noise Ratio:  100dB @ Tuner, Aux, Tape A/B inputs
Input Sensitivity AUX / Tape @ RCA's: 150mV @ 47
@ 1kHz for rated output
Main Output @ RCA's: 1V @ 47 for rated output
Output AUX / Tape @ RCA's: 150mV @ 47
Channel Separation @ AUX: >65dB
Bass Control:  ±10dB @ 50hz
Treble Control:  ±10dB @ 15khz
Subsonic Filter: -3dB @ 16Hz, 6 dB/Oct
High Filter: -3dB @ 10kHz, 6 dB/Oct
Loudness Control: +9dB @ 50Hz & 7dB @ 10kHz (-30dB Vol Level)

PHONO SECTION SPECS:
Freq Response:
RIAA Standard Curve & ±0.3dB
Signal / Noise Ratio:  78dB
Input Sensitivity: 2.5mV @ 47 @ 1kHz for rated output
Max Input / Overload limit:  350mV @ 1k w/ 0.01% THD
Channel Separation @ Phono: >60dB

Again, we have done the previously stated refurbishment / restoration work on this unit to insure its performance, and it gets our full 'Certification'. All functions tested for perfect operation. This unit is in essentially NEW cosmetic condition! Performs and sounds great! This is a very ‘musical’ sounding amp with lot’s of punch! Includes a pdf, 'e' copy, download of the Sansui AU-717 owners / users / instruction manual as well as a full line Sansui Brochure from 1978 (compliments of ' www.hifiengine.com '. Measures 17" wide x 6.75" tall x 15.25" deep and weighs an impressive 40 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 9.5
Sansui AU-717 Integrated Amplifier

(C) R.R.

SOLD 1/12/17
SHIPPED TO WASHINGTON


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


 
 

         

         NEW ADDITION 11/17/17
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / SERVICED
VINTAGE
FISHER INTEGRATED POWER AMPLIFIER
FISHER CA-271 (CA-1271)
STEREO INTEGRATED AMPLIFIER
NOT GOING TO WIN ANY 'BEAUTY CONTEST' BUT MAKES UP IN PERFORMANCE

#...8451
Circa late 1980's
MIJ

SOLD 3/19/18
SHIPPED TO CONNECTICUT


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

ü  Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing fine.

ü Silicone heat sink compound inspected for ‘suppleness’

ü Output section bias / DC offset adjusted to factory spec.

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

ü 'Dashboard' illumination bulbs replaced with new, and balance of indicators checked

ü All functions tested for perfect operation.

ü All inputs and functions tested.

ü Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent!

ü Following electronic refurbishing, the entire unit was cosmetically detailed (still has quite a few 'battle scars'

ü 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.

On our test bench, each internal amplifier of this particular unit, #...8451, produced peak power of 34
Volts @ 8Ω per channel for 144 Watts / channel and 28 Volts @ 4Ω per channel 196 Watts / channel via 4 discrete output devices at 1khz. AC Idle current at .5A. DC offset adjusted to <2mV!!! L&R. Floor noise <0.1mVAC.
____________________________

This Fisher CA-271, Integrated Amplifier was a 'sleeper' when we originally acquired it. We thought it would be too 'recent' to bother with, but then we did our preliminary tests and quickly changed our opinion. Once our tech got finished with it, we were thoroughly surprised and impressed. It has a lot of punch and headroom (check our bench test results above against it's original specs) and is VERY MUSICAL sounding. Large internal power supply, relative to most amps in it's range.

 
____________________________

Fisher CA-271Features include:

- 5-Band, 'Graphic' EQ with centers as follows: 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz.
- Independent speaker selector switches for A, B, A+B, Off
- Phono / Turntable input with Built-In Phono Pre-Amp
- Tape-1 monitor (can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR {CD recorders} ) BUT since ‘TAPE-1’ is a ‘Tape Input’ and not a ‘Tape Monitor / Loop’ it CANNOT BE USED for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Aux / ‘Video Sound’ input
(can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®)
- Loudness for enhancing Bass and Treble response at lower volume levels
- Dual 7-Segment, LED Level Meters
- Meter Range Selector
- Front mounted, ¼”, Stereo headphone jack

Original FISHER CA-271 Specifications:

AMP SPECIFICATIONS:

Power output: 100WPC min RMS @ 8 Ohms & no more than 0.05% THD @ 20-20kHz
THD; <0.05% @ full rated power
IHF IMD; 0.05% @ full rated power & 8 Ohms
Freq Response of power amp section: 20Hz to 20kHz w/ deviation of ±0.2dB
Damping factor; >20 @ 8Ω / 1kHz
Signal to noise ratio: 90dB (line)
Input sensitivity - Phono / All Others:
2.5mV (MM) /  150mV (all at 50kΩ)
EQ with centers as follows: 63Hz, 250Hz, 1kHz, 4kHz, and 16kHz.
Loudness Control;
+8dB @ 100Hz  and +4dB @10kHz
Max Power Consumption;
480 Watts

PHONO SECTION SPECS;
Freq Response;
20Hz-20kHz w/ RIAA deviation of ±0.2dB
S/N; >70dB
Input Sensitivity; 2.5mV @ 50kΩ
Phono Overload; 125mV


Again, we have done the previously stated refurbishment / restoration work on this unit to insure it's performance, and it gets our full 'Certification'. All functions tested for perfect operation. As we stated earlier, this unit isn't going to win any 'beauty contests' (see photos above). Performs and sounds great!
 We can include an 'e' copy, PDF of the Fisher CA-271 / CA-1271 Service manual if the purchaser wishes. Measures
17.25" wide x 4.25" tall x 10.5" deep and weighs an impressive 20 lbs unpacked.
Includes our standard 90 day limited warranty.
 
Cond. 7-7.5 (due to scuffs, scratches, dings)
FISHER CA-271 INTEGRATED AMPLIFIER

SOLD 3/19/18
SHIPPED TO CONNECTICUT


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

 

 

 

    

NEW ADDITION 3/19/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / SERVICED
VINTAGE NAD STEREO INTEGRATED AMPLIFIER
NAD 3120
STEREO INTEGRATED AMP
"STABLE DOWN TO 2 OHMS!!!"

#...1893
Circa 1984-86

SOLD 4/6/18
SHIPPED TO JEFF IN MICHIGAN


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

ü  Following both internal and external visual inspection, the entire unit was cleaned out including all contacts, switches and controls. Switches now clean sounding and performing fine.

ü Silicone heat sink compound inspected for ‘suppleness’

ü We adjusted / set the Output section bias / DC offset to BETTER THAN factory spec (check our results below).

ü All functions tested for perfect operation.

ü All inputs and functions tested.

ü Both amplifier sides produce clean and even sine waves! No power supply hum of any kind. It's dead silent!

ü Following electronic refurbishing, the entire unit was cosmetically detailed

ü 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.

While this amp was originally rated at 25 WPC on our test bench the internal amplifiers of this particular unit, #...1893, produced 19 Volts per channel at 8 ohms for 45 Watts per channel and  16 Volts at 4 ohms for
64 Watts per channel via discrete, outputs (2x RCA 2N3055 & MJ2955)
Idle current draw .2A
DC offset, while the NAD 3120 service manual specs anything less than "50mV", and we originally measured this one, #...1893 at over 44mV / Channel, following our bench service it's now at only <2.0mV!!! on either side.
Very quiet with Floor noise measured at >-60dBm / 0.1 mVAC.
   
____________________________
   
Great performing and 'classic' looking NAD 3120 Integrated Amplifier. Essentially a more 'pure' version of it's predecessor, the 3120, in that they removed the 'tone control' circuit, and the LED power display.
Amazing sounding integrated power amplifier
to provide the heart of a smaller to medium sized Hi-Fi system or 'project recording studio'. Unit looks, works and sounds great!

From the original Brochure,
"Designed for Real-World Performance: Specification tables and magazine test reports confirm that virtually all modern amplifiers measure well in the lab, with impressive figures for parameters such as the power output at 8 Ohms and the S/N with a shorted phono input.  But outside of the lab, amps are not all equal.
At home you don't listen to signal generators, short-circuits or 8-Ohm test resistor loads. you listen to complex and dynamic musical waveforms, generated by phono cartridges and reproduced through loudspeakers whose true impedance is rarely stable at only 8 Ohms.  So, rather than incorporating costly refinements that yield little or no audible benefit, NAD's "real world" approach to product design is focused on obtaining optimum performance under the conditions of everyday use....
Instead of the usual low-cost IC, the phono preamplifier section is a newly designed, discrete transistor circuit whose performance matches that of far more expensive preamp systems.  It interfaces correctly with the 'high impedance' of many magnetic pickup cartridges: it's RIAA equalization is precise: and it is virtually 'distortion-less' - not only with simple 'sine-wave' test tones, but also with dynamic, 'musical waveforms', 30dB above average level.  It's signal / noise ratio is close to the theoretical limit, not only with the short-circuit input that is often used for specifications, but also when a cartridge is connected.  It's total dynamic range is approximately 106dB."


NAD 3120 Features include:
  

- Discrete Output, Class A-B Amplifier design 
- Impedance selector for either 8 or 4 Ohms speakers, which means that you can get 100% of the potential power into just one pair of 8 Ohm speakers. (most amplifiers do not deliver more than 50 to 70% of their 'potential' power unless connected to a 4 Ohm load. This is BIG DEAL!)
- Pre-Out / Main-In loop
-
I/O jacks and Speaker output posts feature 'Point to Point' wiring, so connections are 'stress free' on the circuit boards (all gear should be designed like this, but its 'too expensive' for most of the general public now
- 'Speaker / Tweeter Saving' "Soft Clipping" (defeatable if listener desires or to do 'bench testing')

- 'TRUE' Tape monitor (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Phono / Turntable input
- 'Moving Coil' or 'Moving Magnet' cartridge selector (which means there is a 'head amp' for MC built-in. That alone is worth quite a lot of $$$)
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc. inputs)

- Loudness control. "Loudness" functions to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound
-  Heavy duty, 'Binding / Banana' post speaker outputs
- 1/4" stereo headphone jack
- Dual AC Convenience outlets (1 switched and 1 un-switched) with a total capacity of 250 Watts


NAD 3120 Specifications:
   

POWER AMP SECTION:
Design type: 2 Channel, discrete output, Class A-B
Dynamic Headroom at 8 Ohms; +3.0dB
Freq Response of power amp section at "LAB" input; 10Hz-70kHz
Damping factor; 45 @ 8Ω full bandwidth (means VERY TIGHT bass response)

Input Impedance; 11kΩ
Input impedance at "LAB" input; 22kOhms
Input Sensitivity (for 1W & rated output @ 8Ohms); 1V / 200mV
Cont 'minimum' rated Power: 2x 25 Watts @ 8 Ohms / 20Hz-20kHz
IHF 'Dynamic' Power (max 'short term' power / channel:
2x 50 Watts @ 8 Ohms
 2x 55 Watts @ 4 Ohms
 2x 70 Watts @ 2 Ohms
THD;
0.02% @ 25 Watts & 8 Ohms from 20-20kHz


PRE-AMP SECTION:
Signal / Noise;  90dB @ Tuner / AUX / Tape 'shorted'
Input Sensitivity Tuner / AUX / Tape @ RCA's (for 1W output); 180mV
THD; 0.020% at rated ouput
Loudness Control; +5dB @ 100Hz & +5dB @ 10kHz(-40dB VOL)
Max Input Signal;
>25V
Input impedance (R/C); 47kOhms / 200 pF

PHONO SECTION SPECS;
Freq Response (RIAA curve);
20-20kHz ±0.5dB
S/N  (A-weighted w/ cart connected); >75dB!!! w/ 5mV & >73dB!!! w/ 0.5mV
Input Sensitivity @ 1kHz; 2.7mV MM / 180uV MC
Input impedance (R/C); 47kOhms / 100 pF
 

Again, as stated before, our technician has completely refurb'd this NAD 3120 Stereo Integrated amplifier, cleaning and testing all and it gets our full 'Certification'. All functions test perfectly. Great integrated for just about any stereo system from smaller to medium sized speakers. As there's no tone controls, this would also make a great amplifier for a 'project / home recording studio'. This is a fabulous amp. Sonically superb following our techs work. Very musical. Lots of solid power / punch. Unit looks good and sounds great! Can include a pdf 'e' copy of the NAD 3120 Flyer and / or Service Manual if the new owner so desires. Measures 16.5" wide x 10.25" deep x 4" tall and weighs 12 lbs unpacked. Includes our 90 day limited warranty.
NAD 3120 Stereo Integrated amplifier
Condition 8.5++

(C) R.R.

SOLD 4/6/18
SHIPPED TO JEFF IN MICHIGAN


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

 

 

    

NEW LISTING 3/21/18
 (Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE MARANTZ STEREO INTEGRATED AMPLIFIER
MARANTZ 1060
 #...1938
Circa 1971-'77
(6 years as a 'current' model)
MIJ

SOLD 5/3/18
SHIPPED TO MASSACHUSETTS


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

ü Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls.

ü One side rebuilt by 'old school' tech

ü Heat sink compound upgraded to Silicone Pads

ü Bias adjusted to correct spec.

ü Switches and controls now clean sounding and performing solidly.

 
ü All functions tested for perfect operation.

ü All inputs tested and both side produces clean and even sine waves!

ü No power supply hum of any kind. It's dead silent!

ü Following electronic refurb, entire unit was cosmetically detailed.

This is one the second Marantz 1060 we've had in 23 years, and we've owned this one for over a decade before deciding to finally get it into the shop for it's restoration / service. Classic brushed aluminum face plate with the original aluminum knobs.
 Following 12+ hours of 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.
     
On our test bench the internal amplifiers of this particular unit, #...1938, produced 19 Volts per channel at 8 ohms for 45 Watts per channel and 13 Volts at 4 ohms for 44 Watts per channel via discrete, TO-3 / Metal Cased outputs.
Idle current draw 0.4A.
DC out measured at <3mV on either side.
Very quiet with Floor noise measured at <00.0mVAC.
    
____________________________
 
Probably "The Definitive" of Marantz Integrated amps, and the one that most are compared to. Heck, just check how long it's model was kept current. 6 YEARS! It wasn't until 1979 that they changed it to the 1070, which has the 'less desirable', 'linear' tone controls.
Just the right features & sonically magnificent!
Great amp for home or project recording studio use.


Marantz 1060 Integrated Amplifier Features and 'Creature Comforts' include:


- Produces full power into only '8 Ohms' (most amps can only produce their full power potential into 4 Ohms)
- Speaker selector for Main or Remote, A+B or Off 

- Hi filter for reducing tape hiss / electronic hiss & noise- and record static
- Low Filter with 15Hz cut-off built-in for cutting turntable rumble
- Super quality volume control
- 3-Band EQ / Separate Bass, Mid and Treble with high quality de-tented controls
- Pre-Out / Power-Amp Loop (includes pair of original Marantz Jumpers)
- Loudness function (boosts EQ on Bass and Treble, while cutting mids for a fuller sound at lower volume levels)
- 'Stereo / Mono'  selectors (Mono 1 & 2 IN switch)
- Tape Monitor Loop with both RCA and DIN I/O's (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Phono / Turntable input w/ 'Built-in' phono pre-amp
- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS® etc.)
- Dual AUX inputs w/ "AUX 2" via front mounted, 1/4" jacks. These can also double a 'Microphone Input' jacks (be careful with 'home stereo speakers' when using microphones on stereo gear!!!) (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS®, audio mixers, computer sound-cards etc.)
- Front mounted 1/4" stereo headphone jack
- Back panel features full RCA patch bay for all inputs (each 'fastened separately' to the rear panel, and 'point to point' wired internally, instead of being soldered directly to the circuit board, which is always a 'failure point').
- "spring-clip"  speaker connectors for A&B speakers
-
1 Switched and 1 un-switched AC outlets for a maximum load of 260 Watts of external gear.

 
Marantz 1060 Original Specifications:
 
 "
Continuous Power output of 30 Watts per channel @ 4 or 8 Ohms, or 20 Watts @ 16 Ohms, from 20Hz to 20kHz @ <0.5%THD. Dynamic Power 90 Watts.
 
Design type: 2 Channels, Integrated Pre /
Class AB operation Power Amplifier
Power Output: Continuous power output, 20Hz-20,000Hz;
30 W/Ch THD 0.5% @ 8 Ohms or 4 Ohms

Damping Factor: >45 @ 20-20kHz into 8Ω
IMD; 0.5% at full rated power into 8Ω w/ 20-20kHz
Freq Response: 20Hz-20kHz at full rated power
Input Sensitivities 'non-phono' inputs for full rated output: 180mV / 47K
Ω via RCA's

 
Phono Section:

Freq Response: 20Hz-20kHz RIAA EQ
Phono MM Sensitivity: 1.8mV = 1V @ 'pre out''

Again, as stated before, our technician has completely refurb'd this Marantz 1060 Integrated Stereo Amplifier, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original brushed aluminum, Face and knobs are in beautiful condition. Unit looks beautiful and sounds great with what the restoration tech called "Gutsy" power & punch!
Comes with an 'e' copy / pdf download of the original Marantz 1060 owners / users manual. Measures 14.25" wide x 11" deep x 4.75" tall and weighs 21 lbs unpacked. Includes our 90 day limited warranty!
Marantz 1060 INTEGRATED AMP
Cond. 8.5++

SOLD 5/3/18
SHIPPED TO MASSACHUSETTS

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

 

  

   

 

 

 

 

 


**
"(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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POLICIES, SPECIFICATIONS, AVAILABILITY, INFORMATION
AND PRICING SUBJECT TO CHANGE  AT ANYTIME  AND
WITHOUT PRIOR
NOTICE
and changes may not be posted to web immediately
.
 

20-30% restock fee / service charge applies to all returns for refund depending on item specifics & / or individual distributor / drop shipper policies.
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