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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:
 



    


NEW LISTING 11/14/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
SERVICED / REFURBISHED*
KENWOOD STEREO PRE- AMP
KENWOOD CONTROL AMPLIFIER "Basic C2"

#...0478
Circa 1984-90 
for sale

ü Our technician has completely gone through this unit*.

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

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

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

ü  No power supply hum of any kind. It's dead silent!
  
____________________________
 
 
Versatile Kenwood "Basic C2" Pre-amp / control center. Would match up well with any power amp and is very "utilitarian". Loaded with "real world" features. Again, with the exception of the 'bypassed balance control', the unit works well and sounds great! Cosmetically the only issue really worth mentioning is that the top, metal cover has scratches from someone sitting a unit with no feet on it and moving it around.

Kenwood C2 Features include:
 
 

- Separate Bass and Treble with selectable turnover frequency
- Turnover freqs set at 200 or 400 on the bottom end and 3k or 6kHz on the top end.
- Phono / Turntable input
- Selector for MM or MC cartridges
- 5 position phono cartridge EQ selector (this feature, combined with the MM/MC selector / head-amp alone can be worth a few hundred dollars, if you're contemplating moving up to a Moving Coil turntable cartridge. MC carts require an extra head-amp and this amplifier has one built in)
- Built-in Low and Subsonic Filters to eliminate excess rumble from sources such as turntables. These are selectable for either 58Hz, 40Hz or 18Hz @ 18dB / Oct.
- Hi "Scratch" filter set at 8Khz with a slope of 12dB / Oct. Useful for reducing the 19kHz pilot tone in FM and tape hiss / electronic hiss & noise and record static
- Output defeat
- Mono / Stereo input selector
- Dual Tape Monitors with bi-directional dubbing
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc. as well as for CDR)
- Dual (1 & 2) Aux inputs
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- CD Input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Headphone output with separate level control
- Indicator LED's for input selector
- 3 AC convenience outlets ( 2 switched 1 un-switched)

  
Kenwood C2 Original Specs:
  
 
Design type: 2 Channels, Analog operation
Frequency Response: 1-350kHz +0 / -3dB
Maximum Output Level: 1V
THD; 0.001% at full rated power
Phono MM Sensitivity: 2.5mV for 5.0V output @ 1kHz
Phono MM Maximum Input Level: 200mV
Phono MC Input Impedance: Selectable
S/N on Phono MM w/ 5mv signal: 94dB
Phono Capacitance: Selectable
High Level Sensitivity (tuner, Aux, Tape): 150mV

  
The Kenwood C2 has always been one of our favorite pre-amps under $606-$800. It's simply hard to beat for specs, features and performance. That is also evidenced by the fact that it was current in Kenwood's lineup, as their upper end pre, for almost half a decade. Again, we have completely gone through the unit cleaning all contacts, pots, switches and controls. All functions (again, with the exception of the 'Balance' control') test as original. Unit looks and sounds great! Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs unpacked. Comes with original owners manual and includes our 90 day limited warranty.
KENWOOD BASIC C2
Condition 7.5 (due to balance control issue)

$359.

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



 


 

 

    

NEW LISTING 11/14/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
SERVICED / REFURBISHED*
KENWOOD STEREO PRE- AMP
KENWOOD CONTROL AMPLIFIER "Basic C2"

#...0258
Circa 1984-90 
for sale
ü Our technician has completely gone through this unit*.

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

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

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

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

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

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

Kenwood C2 Features include:
 
 

- Separate Bass and Treble with selectable turnover frequency
- Turnover freqs set at 200 or 400 on the bottom end and 3k or 6kHz on the top end.
- Phono / Turntable input
- Selector for MM or MC cartridges
- 5 position phono cartridge EQ selector (this feature, combined with the MM/MC selector / head-amp alone can be worth a few hundred dollars, if you're contemplating moving up to a Moving Coil turntable cartridge. MC carts require an extra head-amp and this amplifier has one built in)
- Built-in Low and Subsonic Filters to eliminate excess rumble from sources such as turntables. These are selectable for either 58Hz, 40Hz or 18Hz @ 18dB / Oct.
- Hi "Scratch" filter set at 8Khz with a slope of 12dB / Oct. Useful for reducing the 19kHz pilot tone in FM and tape hiss / electronic hiss & noise and record static (again, NON-functional on this particular unit, #...0258)
- Output defeat
- Mono / Stereo input selector
- Dual Tape Monitors with bi-directional dubbing
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc. as well as for CDR)
- Dual (1 & 2) Aux inputs
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- CD Input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Headphone output with separate level control (again, NON-functional on this particular unit, #...0258)
- Indicator LED's for input selector
- 3 AC convenience outlets ( 2 switched 1 un-switched)

  
Kenwood C2 Original Specs:
  
 
Design type: 2 Channels, Analog operation
Frequency Response: 1-350kHz +0 / -3dB
Maximum Output Level: 1V
THD; 0.001% at full rated power
Phono MM Sensitivity: 2.5mV for 5.0V output @ 1kHz
Phono MM Maximum Input Level: 200mV
Phono MC Input Impedance: Selectable
S/N on Phono MM w/ 5mv signal: 94dB
Phono Capacitance: Selectable
High Level Sensitivity (tuner, Aux, Tape): 150mV

  
The Kenwood C2 has always been one of our favorite pre-amps under $606-$800. It's simply hard to beat for specs, features and performance. That is also evidenced by the fact that it was current in Kenwood's lineup, as their upper end pre, for almost half a decade. Again, we have completely gone through the unit cleaning all contacts, pots, switches and controls. All functions (again, with the exception of the 'Balance' control') test as original. Unit looks and sounds great! Unit measures 17.25" wide x 3" tall x 13" deep and weighs 10 lbs unpacked. Comes with original owners manual and includes our 90 day limited warranty.
KENWOOD BASIC C2
Condition 7 (due to balance control, headphone amp and Hi-Filter issues)

$299.

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



 

 

 

 


UPDATED LIST 11/12/18
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)

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 (passed final inspections / auditions, awaiting photos / text)

MXR Model 150 / "System Pre-Amp II"
(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)

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

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

 


POWER AMPS:
 

      

NEW LISTING 11/13/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
FULLY SERVICED / BENCH TESTED
HAFLER STEREO POWER AMPLIFIER
HAFLER 9180
 #...1277
 Circa 19
91-94
for sale

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

ü  Amp has been cleaned inside and out.

ü  We replaced the AC power input jack.

ü  Internal fuses checked for correct values and function

ü  Bias and DC offset set correctly.

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

Amp designed using Huge Power Supply Transformer and super quality (expensive) filter caps. Externally located, vertically finned heat sink for very efficient and silent, passive cooling of output devices (all amps / receivers should be designed this way). This amplifier is in both great electronic and physical shape. Looks LIKE NEW and sounds fantastic! All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly.
Technician's note;
"this amp was final evolution of the DH-220's. VERY good build quality"
   
On our test bench, this unit's (#...1277) amplifiers produced 32+ Volts at 8 Ohms per channel for 128 Watts / channel and 28+ Volts at 4 Ohms per channel for 210 Watts / channel via discrete output transistors (DC out adjusted to less than 9mV per channel. Floor noise < 0.1mVAC. Idle AC current draw @ .86A)
   
Great "general purpose" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. We run it's little brother in our main demo system and have for years. Love it!!! Great for full range stereo speakers, Studio Monitors, stage monitors, wedge monitors or running drivers in a Bi-Amp / Tri-Amp system.
For you 'tech-savvy' types, here's an excerpt from the original manual regarding amp architecture and 'Mono-mode',
"
The input stage of the 9180 Amplifier utilizes four low-noise, High-g, JFET’s (high trans-conductance junction field-effect transistors), in a fully complimentary, symmetric configuration. This circuit configuration results in excellent front-end headroom and a simple, straightforward connection to the remainder of the circuitry. The ultra low noise characteristics of the JFET’s virtually eliminates noise “mixing” (inter-modulation) with the music signal, reducing discordant product frequencies known as “noise grain”, or “noise fuzz”.

    The input stage is cascade connected to convert the low voltage input system to the high voltage output system, and “speeds up” the front end for superior bandwidth. The cascade stage is connected to an emitter-follower and current mirror configuration that amplifies the current level about ten times, necessary to drive the biasing string and final output stage driver emitter followers.
    
The final output stage uses multiple lateral MOSFET’s (Metal Oxide Semiconductor Field Effect Transistors): four devices per channel in the 9180. These devices, unlike conventional bipolar transistors, have a negative temperature coefficient, which means that they do not exhibit “thermal runaway”. Thermal runaway is a phenomenon whereby a transistor heats up as it conducts more current, which causes it to get hotter, and conduct more current, and so on, until the device self-destructs. Since MOSFET’s are inherently self-protecting, no sonically degrading, complex circuitry is required to monitor and protect the output devices.
     Furthermore, these lateral MOSFET’s exhibit a very linear input to output transfer function. Their connection in circuits and operating characteristics are very similar to vacuum tubes, which is perhaps responsible for their widely recognized sonic trait of being very “musical” and non-fatiguing.

     Conversion to Mono Mode is accomplished by driving the negative input (feedback point) of the right channel with the output of the left channel. This causes the right channel to mirror exactly the output of the left channel, but 180 degrees out of phase. This creates twice the voltage swing to be available across the two red output binding posts. This simple method of bridging the amplifier (involving only
one resistor) eliminates the costly and sonically degrading invertors circuitry used in other amplifiers."

 

HAFLER 9180 FEATURES:

  

- Stable down to 2 Ohms!
*

- Two Channel or 'Bridged Mono' Operation
- Very Large Area dedicated to heat dissipation via, Vertically mounted, external heat sinks that cover 66% of the rear panel and almost 100% of each side.
- 'Soft Turn-On / Turn-Off' protection against "turn-on / turn-off" transients
- Thermal protection
for amplifier
- Variable Input level controls on front panel
- RCA input signal I/O's, Gold Plated
- Speaker outputs via 5-Way binding / banana posts
- Discrete output transistors
- Huge power transformer and filter capacitors 75V / 15,00
0
μF

  
 Unit looks near new, performs and sounds great!
  
HAFLER 9180 ORIGINAL SPECIFICATIONS / SPECS:
  

-Stable down to 2 Ohms!
(
*in certain circumstances ie; limited times / frequency range /
 power output. We wouldn't recommend constant 2 ohm load personally for very many amps)
Sensitivity (for 105 watts @ 8 Ohms): 1.4 VRMS

THD: 0.005% @ 1kHz, 0.025% @ 8 ohms, 20Hz - 20kHz
Power Bandwidth: 0.3Hz to 116Hz

S/N: >100dB @ 105 Watts @ 8
Ω un-weighted
Slew Rate: 50V / μsec
Damping Factor: >300 to 1k / 8
Ω & >200 to 10k / 8Ω


Input Impedance: 47k ohms unbalanced
Connectors (each channel): Input: RCA. Output: 5-way binding posts
Cooling: Convection (
Vertically mounted, external heat sinks, wrapping nearly 70% of the way around the amp.)
Amplifier Protection: Full thermal
Speaker
Protection: 'Soft Turn-On / Turn-Off'
Power Consumption: 100W @ 'quiescent' and 1200 Watts max
  

Rated Output Power (per channel):
Continuous Average Output Power Both Channels Driven:
8 ohms, 20Hz - 20kHz, 0.025% THD: 105
Watts
  
Again, we have completely gone through the unit cleaning and testing all. On our test bench, both amplifiers produce perfectly clean and symmetrical sine waves at both 8 & 4 ohm loads. Includes an 'e-copy' pdf download of the Hafler 9180 owners / users / instruction / service manual. Measures 17" wide x 12.5 deep x 4" tall and weighs 33 lbs unpacked. Includes our standard 90 day limited warranty.
HAFLER 9180
Cond. 9
$489.
 
(C) R.R.
 
 
(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
  (Click on above thumbnails to enlarge photos)
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
$399.

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

   

    

NEW LISTING 11/13/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
SERVICED / BENCH TESTED
NHT (NOW HEAR THIS) MONAURAL SUB-WOOFER
POWER AMPLIFIER
NHT SA-3
 #...1346
"WORLD AC POWER"
 Circa 1998

for sale


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

ü  Amp has been cleaned inside and out.

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

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

ü  This amplifier is in both great electronic and physical shape.

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

ü  Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly.

Looks great and sounds fantastic!
   
On our test bench, this unit's amplifiers produced 37 Volts at 8 Ohms per channel for 170+ Watts / channel and 35 Volts at 4 Ohms  per channel for 305+ Watts / channel via discrete output transistors. (DC offset measured at outputs at 1.1mVDC. Idle AC current draw @ .34A.)
   

Great "Subwoofer" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. Class-G architecture, which is great for 'lower frequencies' to get lots of power efficiently.

Externally located (gets the heat outside of the cabinet where it belongs), vertically finned heat sink for very efficient and silent, passive cooling of output devices (all amps / receivers should be designed this way).

 
NHT SA-3 FEATURES:
  

- Class-G (great for 'subwoofer' applications)
-
Built-in Frequency limiter / selectors
Hi-Pass filter selectable 65Hz, 80Hz, 100Hz, 125Hz and 150Hz
(rear panel)
Low Pass Filter continuously variable from
32Hz to 150Hz
(rear panel)
- Phase selectable for
0°, 90°, 180°, & 210° (rear panel)
- Variable Input Level control (front panel)
- Vertically mounted, external heat sinks
- Gold Plated RCA signal I/O's
- Speaker outputs via 3-Way binding / banana posts
- Discrete output transistors
- 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.


NHT SA-3 ORIGINAL SPECIFICATIONS / SPECS:


System Type: Monaural Class-G Subwoofer Amplifier
Continuous Average Output Power: 250 Watts @ 6 Ohms

THD: 0.03% @
full rated output
  
On our test bench, the amp produce perfectly clean and symmetrical sine waves at both 8 & 4 Ohm loads.
Includes an 'e-copy' pdf download of the NHT SA-2 Owners / users manual.  Measures 17" wide x 14.5 deep x 5.2" tall and weighs 24 lbs unpacked. Includes our standard 90 day limited warranty.
NHT SA-3
Cond. 8.5
$349.
 
 
(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 LISTING 11/13/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
VINTAGE TECHNICS INTEGRATED STEREO AMPLIFIER
TECHNICS SU-V6X
#...
5A161
BIG POWER &

TONS OF INPUTS FOR A 'VINTAGE' UNIT

Circa 1984-86
"WORLD AC POWER"
M.I.J.
for sale

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 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 load with "Loudness" on and both Tone Controls at 10 for 48 hours.


On our test bench, each internal amplifier of this particular unit, #...A161, produced peak power of 34 Volts per channel at 8 ohms for 144 Watts per channel and 24 Volts at 4 ohms for 144 Watts per channel via discrete output transistors (2X 2SA1301 & 2X 2SC3280).
AC Idle current at 450mA. Floor noise > -60dB.
 
____________________________

I used to sell Technics integrated amps (and most of their other gear) when this unit was current. This one appears to be designed for the Euro/Asia/Military market as the version I sold here in North America didn't have as many inputs nor the 'impedance switch' if I recall correctly. This is a great amp for mid to larger sized audio systems at 144+ Watts per channel. Great for larger woofer systems as well. Loaded with 'usable' features as well. Works and sounds great!


TECHNICS SU-V6X Features Include:

- Speaker Load Impedance selector on rear panel. This is probably the most important feature of this amp (I wish all amps had this). Allows 100% of the power to be utilized on speakers of only 8-16 Ohms, instead of 50-75% of power, which would be typical of most amps / receivers.
- Technics 'New Class A' amp architecture (reduces 'switching distortion due to output transistors staying on throughout sine-wave)

- Discrete Output Transistors

- Dual 71V / 15,000 uf power supply filter caps
- A (Main) -B (Remote) -A+B-& off speaker selector
- Separate Bass and Treble
- Tone Defeat (Straight DC) selector for 'purest' signal path if desired
- 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)
- Phono / Turntable input 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)
- CD Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- TV / Video 1 Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- TV / Video 2 Input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)

- Graphic EQ loop allows you to either inject an additional / external processor without 'chewing up' one of the inputs
- Record Out selector with bi-directional tape dubbing controls. (Separate "Record Out" allows recording from one source while you listen to another) (‘Record Out’ also allows the use of external signal processors, such as EQ’s, to be used with ‘Tape-2’)

- Loudness control. "Loudness" functions to boost Bass in relationship to Mid frequencies at lower volume levels for a much fuller sound

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

- Instant -20dB audio level muting
- Front mounted 1/4" stereo headphone jack
- Triple AC convenience outlets on rear panel with 1 switched 100 Watts and 2 un-switched (100 Watts ea) for a total capacity of 300 Watts of accessories.

-
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.


Original
TECHNICS SU-V6X Specifications:

POWER SPECIFICATIONS:

Rated Power output: 100 WPC min RMS @ 8 Ohms & no more than 0.003% THD and 0.007% @ 4 Ohms and across 20-20kHz
THD:
no more than 0.001% THD @ 20-20kHz at full rated power
SMPTE IMD: no more than 0.007% THD @ 8 Ohms / 20-20kHz at full rated power
Damping Factor: 80 @ 8 Ohms and 40 @ 4 Ohms (TWICE what many amps are rated at!!!
Speaker Impedance: 4 Ohms minimum

PRE-AMP SECTION:
Signal / Noise Ratio:  104dB @  "Line Level' inputs
(IHF '66 standard)
Input Sensitivity @ any 'Line Level' @ RCA's: 150mV @ 18kΩ for rated output
Output Tape Record @ RCA's: 150mV or EQ loop @ 18
Freq Response: 0.7Hz-140kHz -3dB or 20Hz-20kHz -0.2dB
Bass Control:  ±10dB @ 50Hz
Treble Control:  ±10dB @ 20kHz
Subsonic Filter: >3dB @ 30Hz, 6 dB/Oct
Loudness Control: +9dB @ 50Hz & ~6dB @ ~10kHz (-30dB Vol Level)

PHONO SECTION SPECS:
Freq Response:
RIAA Standard Curve & ±0.5dB
Signal / Noise Ratio:  88dB w/ 2.5mV input (IHF '66 standard)
Signal / Noise Ratio:  72dB w/ 250
μV input (IHF '66 standard)
Input Sensitivity MM: 2.5mV @ 47kΩ for rated output
(IHF '66 standard)
Input Sensitivity MC: 0.17mV @ 220 for rated output
(IHF '66 standard)
Max Input / Overload limit MM:  >170-210mV (Frequency dependant)
Max Input / Overload limit MC:  >12-15mV (Frequency dependant)

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 good cosmetic condition. The 'worth mentioning' cosmetic issues would be that the silk screened labels on the 'Input' buttons have partially worn off, so it's a bit difficult to tell at first what buttons do which inputs. Obviously once you got acquainted with their function you would be able to 'work around' that.
Performs and sounds great! This is a very ‘musical’ sounding amp with lot’s of punch!
Includes a pdf, 'e' copy, download of the TECHNICS SU-V6X service manual if the purchaser desires. Measures 16.9" wide x 5.5" tall x 14.9" deep and weighs an impressive 25 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8.5
TECHNICS SU-V6X Integrated Amplifier
$599.
(C) R.R.


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

 

 

      

NEW LISTING 10/29/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY SERVICED
VINTAGE SAE
INTEGRATED STEREO AMPLIFIER
SAE TWO A7
#...3533
DUAL PHONOS, DUAL TAPE MONITORS AND EXTERNAL PROCESSOR LOOP

Circa 1976-83
M.I.J.
for sale

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 
Defective 'meter IC' replaced

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 load with "Loudness" on and both Tone Controls at 10 for 48 hours.

On our test bench, each internal amplifier of this particular unit, #...3533, produced peak power of 26 Volts per channel at 8 ohms for 84 Watts per channel and 24 Volts at 4 ohms for 144 Watts per channel via discrete output transistors.
AC Idle current at 460mA. Floor noise 0.3mVAC.
 
____________________________

We don't get many SAE components in (other than my 'personal' units). This is a great amp for mid sized audio systems at 70+ Watts per channel. Great for up to 12" woofer systems. Loaded with 'usable' features as well. Looks and sounds great!


SAE TWO A7 Features Include:


- Discrete Output Transistors
- A-B-A+B-& off speaker selector
- 3-Band EQ w/ Separate Bass, Mid and Treble
- 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

- 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 allows you to either inject an additional / external processor between the Pre and Power, or to connect Pre-amp to another power amp, or to connect another pre-amp to the power amp.
- Front mounted 1/4" stereo headphone jack
- One of my favorite aspects, "Easy to use" Speaker Connectors
- Quad AC convenience outlets on rear panel with 2 switched (550 Watts combined) and 2 un-switched (100 Watts) for a total capacity of 650 Watts of accessories.


Original
SAE TWO A7 Specifications:

POWER SPECIFICATIONS:

Power output: 70 WPC min RMS @ 8 Ohms & no more than 0.05% THD @ 20-20kHz
THD:
no more than 0.05% THD @ 20-20kHz at full rated power
Speaker Impedance: 4 Ohms minimum

PRE-AMP SECTION:
Signal / Noise Ratio:  95dB @ Tuner, Aux, Tape A/B inputs
Input Sensitivity AUX / Tape @ RCA's: 150mV @ 47kΩ @ 1kHz for rated output
Main Input @ AUX or TAPE: >4V
Output AUX / Tape @ RCA's: 150mV @ 47kΩ
Bass Control:  ±10dB @ 100Hz
Treble Control:  ±10dB @ 10kHz
Subsonic Filter: >3dB @ 30Hz, 6 dB/Oct
Loudness Control: +8dB @ 100Hz & 6dB @ 10kHz (-30dB Vol Level)

PHONO SECTION SPECS:
Freq Response:
RIAA Standard Curve & ±0.3dB
Signal / Noise Ratio:  74dB
Input Sensitivity: 2.5mV @ 47kΩ @ 1kHz for rated output
Max Input / Overload limit:  >150mV

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 great 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 SAE TWO A7 / A7e service manual if the purchaser desires. Measures 18.4" wide x 5.5" tall x 13.75" deep and weighs an impressive 24 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8.5
SAE TWO A7 Integrated Amplifier
$599.


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

 

 

 

         

        NEW ADDITION 11/16/17
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY 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)

 

 

 

 

    

    
(above left photo of amp with 'matching' tuner.
Sold separately)

NEW LISTING 11/10/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY SERVICED
VINTAGE FISHER
INTEGRATED STEREO AMPLIFIER
FISHER "STUDIO STANDARD" CA-7000 SERIES
FROM FISHER 'SYSTEM 7000' RACK
#...5790
WITH 'MIC MIXING'

Circa 1978-79
M.I.J.
for sale

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

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

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

ü 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 load with "Loudness" on and both Tone Controls at 10 for 48 hours.

On our test bench, each internal amplifier of this particular unit, #...5790, produced peak power of 21 Volts per channel at 8 ohms for 55 Watts per channel and 17 Volts at 4 ohms for 72 Watts per channel.
AC Idle current at 230mA. Floor noise < -60dBm.
 
____________________________

Great looking, Rack Mount, Silver-face, Fisher Studio-Standard CA-7000 integrated amplifier. This is a great amp for mid sized audio systems at 70+ Watts per channel. Great for up to 12" woofer systems. Loaded with 'usable' features as well. Looks and sounds great!


Fisher Studio-Standard CA-7000 Features Include:


- Dual VU power level meters showing both dB's and Watts
- Externally located, Vertically oriented heat sinks (keeps output 'heat' outside of the amp housing, where it belongs)

- Separate Bass, Mid and Treble featuring high-quality, De-tented pots
- Super quality de-tented Volume control pot
- Separate Tape Monitor (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)
- Phono / Turntable input 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
- Microphone input with 'Mixing Level' control (be careful with your speakers using an 'open' microphone thru them)
- Range selector for Power Meters
- Externally located amplifier protection fuses

- Front mounted 1/4" stereo headphone jack
- Rack-Mountable Fisher Studio Standard amp for Fisher racks (17.5" wide. This is not 'standard' rack width, which is 19")
- Triple AC convenience outlets on rear panel with 2 switched (100 Watts combined) and 1 un-switched (100 Watts) for a total capacity of 200 Watts of accessories.


Fisher Studio-Standard CA-7000 Specifications:

POWER SPECIFICATIONS:
Power Bandwidth: 15Hz-40kHz
Power output: 42 WPC min RMS @ 8 Ohms & no more than 0.3% THD @ 15-40kHz
THD:
no more than 0.3% THD @ 20-20kHz at full rated power and 0.03% THD @ 10 Watts output
Damping: 40 @ 8 Ohms
Speaker Impedance: 8 Ohms minimum


PRE-AMP SECTION:
Frequency Response: 120Hz-20kHz
Signal / Noise Ratio:  85dB @ Tuner, Aux, Tape A/B inputs
Input Sensitivity AUX / Tape @ RCA's: 150mV @ 35k Ω @ 1kHz for rated output
Output AUX / Tape @ RCA's: 150mV @ 47k Ω
Bass Control:  ±10dB @ 50Hz
Treble Control:  ±10dB @ 20kHz
Loudness Control: +8dB @ 100Hz & 4dB @ 10kHz (-30dB Vol Level)
Microphone Input w/ 600 Ohm mic:
2.5mV/ 6k Ohms

PHONO SECTION SPECS:
Freq Response:
RIAA Standard Curve & ±0.3dB
Signal / Noise Ratio:  75dB
Input Sensitivity: 2.5mV @ 50k Ω @ 1kHz for rated output
RIAA Deviation: RIAA Standard Curve ±0.5dB

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 great cosmetic condition! The only issue worth mentioning is there's some light 'pitting' on the rack handles that is mostly noticeable when you are caring or lifting the unit by the handles. Performs and sounds great! This is a very ‘musical’ sounding amp with lot’s of punch! Includes a pdf, 'e' copy, download of the Fisher Studio-Standard CA-7000  service manual if the purchaser desires. Measures 17.75" wide x 5.5" tall x 11.5" (including rack handles) deep and weighs an impressive 24 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8.5
Fisher Studio-Standard CA-7000 Integrated Amplifier
$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
(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

#...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 ADDITION 3/19/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
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

SOLD 7/26/18
SHIPPING TO MIKE IN WASHINGTON


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++

SOLD 7/26/18
SHIPPING TO MIKE IN WASHINGTON

(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 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)

 
 

  

   


**
"(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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