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

FULLY SERVICED / WARRANTED
STEREO PRE-AMPS, POWER AMPS,
 INTEGRATED AMPLIFIERS
USED, VINTAGE & CLASSICS FOR SALE

 

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

 


OUR SERVICED / RESTORED AMPS, PRE-AMPS, POWER AMPS AND INTEGRATED AMPS:
 
 
  
 


PRE-AMPS:
 

NONE CURRENTLY AVAILABLE.

 

 


 

 


POWER AMPS:
 

         

NEW LISTING 4/15/20
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CheckMarkSmall_web.jpg (792 bytes) warranty

REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGE DYNACO STEREO POWER AMPLIFIER
 DYNACO "STEREO 150" POWER AMP
DC OFFSET ADJUSTED TO SUPER LOW LEVEL
OUTPUT BIAS SET TO SPEC

#...1155
 Circa 1974-79
 MADE IN U.S.A.

for sale

 Our technician has completely gone through and 'Certified' this unit. Output transistor removed and tested independently. Both original pilot lamps in working cond. Fuses (mains and 'speaker protection') checked for correct values. All functions have been tested and pass with flying colors! Both inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent!
This is one of the most 'famous' power amplifiers ever designed and sold. Originally co-designed by David Hafler (always been a favorite amp engineer of mine).
    

On our test bench, this particular Dynaco Stereo-150, #...1155's amplifiers produced 27.5+ Volts at 8 Ohms per channel for 94+ Watts / channel and 23.5+Volts at 6 Ohms per channel for 138 Watts / channel via discrete, metal cased, TO-3 output transistors. (Idle AC current draw @ 0.5A.
DC less <2mVDC / Ch (under 8 Ohm load).
Bias adjusted to 75mVDC.



Floor noise measured at L& R = > -60dBm

 Dynaco amps have always been known for understated appearance and performance. This was the replacement for the uber famous, "ST-120" power amp. A bit more 'conventional' in appearance and packaging, with an 'up' in power output. Excellent for 2-channel (stereo) audio listening or for use in an A/V system or for driving project studio monitors. From the original manual,
"The Stereo 150 has been designed as two independent 75 watts (at 8 ohms) amplifying channels with a common power supply having a high degree of inherent regulation. In addition, where higher powers or higher volt-amp capabilities are required for lower load impedances, easy internal re-strapping permits monophonic operation for 150 watts output (at 8 ohms)."
    
DYNACO STEREO-150 Features:
- 2-Channel stereo, Class A/B operation
- Discrete output transistors
- Huge, externally located, vertical heat sinks

- Standard RCA input jacks
- Oversize power supply transformer and capacitors
- 2-Way, Binding post / Banana speaker jacks
- Externally located Speaker / Output protection fuses
- Internally located AC / MAINS fuse


DYNACO STEREO-150 Original Specs:
Design type:
2 Channels, AB operation
Rated RMS Output Stereo 20-20,000Hz: 100 Watts per channel, min. RMS, @ 4Ω
75 Watts per channel, min. RMS, @ 8Ω
Rated RMS Output Bridged Mono 20-20,000Hz: 150 Watts per channel, min. RMS, @ 8Ω

Damping Factor: @ 1kHz / 8Ω: >80
@ 50Hz-10kHz / 8Ω: >50
Signal / Noise: >95dB @ 75Watts
THD; <0.25% @ rated power / 8Ω
IMD; <0.25% @ rated power / 8Ω

Input Sensitivity: 1.0V for 75 Watts output
Input Impedance: 35k Ohms
Channel Separation: >70dB @ 20Hz-20kHz
Freq response: 10Hz-40kHz @ 8Ω
Max Power consumption:
600 Watts

Again, our senior tech has completely gone thru this Dynaco Stereo-150 and it gets our full '
Certification'.  Cosmetically it has a few 'battle scars', but nothing too distracting (see photos above). Only 'performance' issue to be aware of is that Dynaco amps do not have 'relays' to block 'turn On / Off' thumps / sounds, so at turn-on you will hear a bit of 'electronic noise' as the circuits come to life, but nothing that is destructive. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 150 owners / users / instruction / assembly / service manual (which is actually an 'amazing read' and should probably be read by anyone using / owning ANY amplifier from ANY brand and ANY model! Just FYI).
Unit measures 14.5" wide x 13.75" deep x 6.75" high and weighs ~26 lbs unpacked. Includes our 90 day limited warranty.
 DYNACO STEREO 150, 2-CHANNEL POWER AMP
Cond. 8.5
$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)


 

 

    

         NEW
LISTING 6/17/19
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REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGE DYNACO STEREO POWER AMPLIFIER
 DYNACO "STEREO 120" POWER AMP
#...2874
 Circa 1969-78
 MADE IN U.S.A.

for sale

 Our technician has completely gone through and 'Certified' this unit. Output transistor removed and tested independently. Multiple Electrolytic Caps replaced. The balance tested and passed. Unit bench checked / tested. Output transistors 'Beta Matched'. All functions have been tested and pass with flying colors! Both inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent!
This is one of the most 'famous' power amplifiers ever designed and sold. Originally co-designed by David Hafler (always been a favorite amp engineer of mine), they have been the 'heart' of many audio systems since the late '60's.
    

On our test bench, this particular Dynaco Stereo-120, #...2874's amplifiers produced 23 Volts at 8 Ohms per channel for 66 Watts / channel and 18 Volts at 6 Ohms per channel for 81 Watts / channel via discrete, metal cased, TO-3 output transistors. (Idle AC current draw @ 0.5A.
DC less <3mVDC / Ch (under 8 Ohm load).
Floor noise measured at L& R = 2.3mVAC) 
    

 Dynaco amps have always been known for understated appearance and performance. While they were never much on looks or 'whistles and bells', they made up for that in performance. Excellent for 2-channel (stereo) audio listening or for use in an A/V system or for driving project studio monitors.
    
DYNACO STEREO-120 Features:

- 2-Channel stereo, Class A/B operation
- Standard RCA input jacks
- Oversize power supply transformer and capacitors
- 3-Way, Binding post speaker jacks
- AC / MAINS protection fuse

    
DYNACO STEREO-120 Original Specs:
Design type:
2 Channels, AB operation
Damping Factor @ 20Hz-20kHz / 8Ω: >40
Signal / Noise: >100dB @ 60 Watts
Input Sensitivity: 1.5V for 60 Watts output
Input Impedance: 100k Ohms
Channel Separation: >70dB @ 20Hz-20kHz
Rated RMS Output Stereo: 60 Watts per channel, min. RMS, @ 8Ω
IMD; <0.5% @ rated power / 8Ω
Freq response: 5Hz-100kHz @ 8Ω
Wall AC current needed:
400 Watts
  

Again, our senior tech has completely gone thru this Dynaco Stereo-120 and it gets our full
'Certification'.  Nickel / chrome plating is in great shape with none of the typical surface pitting / corrosion / rust. Perforated, top cover also rust and dent free. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 120 owners / users / instruction / assembly / service manual (which is actually an 'amazing read' and should probably be read by anyone using / owning ANY amplifier from ANY brand and ANY model! Just FYI).
Unit measures 10.5" wide x 13" deep x 4" high and weighs 20 lbs unpacked. Includes our 30 day limited warranty.
 DYNACO STEREO 120, 2-CHANNEL STEREO POWER AMP
Cond. 8.5
$449.
 (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
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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.
HOLD? 1/25/21 FOR GARY IN CANADA

(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 5/1/19
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REFURBISHED / FULLY SERVICED & WARRANTED
VINTAGE PIONEER STEREO INTEGRATED AMPLIFIER
PIONEER SA-6500-II / SA6500-II
#...352F
Circa 1977-79
MIJ

SOLD 3/1/2021
SHIPPING TO KEN IN FLORIDA


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  Input function switch replaced as the original had intermittent issues

ü  Headphone circuit board repaired as one channel was in-op.

ü  Solder joints reflowed on probable high heat and high stress points

ü  New AC Power / Pilot lamp installed

ü  Amplifier section had output bias and DC offset checked to acceptable 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. (Technicians note, "this is a very 'tech friendly & serviceable' amplifier design")
Total tech time 6+ hours.

     
On our test bench the internal amplifiers of this particular unit, #...352F, produced 18+ Volts per channel at 8 Ohms for 40+ Watts per channel and 14+ Volts at 4 Ohms for 49+ Watts per channel via discrete outputs (2x NEC 2SB616A & 2x NEC 2SD586)
Idle 'Mains' current draw  0.1A.
Floor noise measured @ >-60dBm.
    
____________________________
    
Great performing and 'classic' looking Pioneer Integrated Amplifier. The Pioneer SA-6500. This is the first of this model we've had. Great unit to provide the basis of a medium to medium large sized Hi-Fi system or 'project home studio'. Following the above refurb / service work, the unit now works well and sounds great!

Pioneer SA-6500-II Features include:
   

- Discrete Amplifier Output design 
- Speaker A, B Off selector
- Separate Bass and Treble controls featuring high-quality, de-tented controls
- "Tone" switch to bypass tone controls for purest, most un-adulterated signal path
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- 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)
- Tape Dubbing 1->2 Capability
- Phono / Turntable input with 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
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- 1/4" stereo headphone jack
- Spring loaded, 'Push'' speaker outputs
- Quad AC Convenience outlets (2 switched and 2 un-switched) with a total capacity of 400 Watts


Pioneer SA-6500-II Original Specs:

"Continuous Power Ouput is 30 Watts / Ch. min RMS, @ 8 Ohms or 30 Watts / Ch @ 4 Ohms from 20-20kHz w/ < 0.1% THD."
Design type:
2 Channel, discrete output
Damping Factor @ 1kHz / & 20-20kHz: 30
THD; 0.1% at full rated power (30W + 30W) into 8
Ω w/ 20-20kHz
Potential Frequency Response @1W: 10-40kHz +/-0dB

S/N: 93dB for Tuner, Tape and AUX inputs
Bass Control: +9dB /-8dB @ 100Hz
Treble Control: 
+8dB /-6dB dB @ 10kHz

Loudness Control: +8dB @ 100Hz & +5dB @ 10kHz (-40dB Vol Level)

Input Sensitivities: Non-Phono inputs = 150mV / 50kΩ
Non-Phono Inputs: 150mV / 50kΩ
Tape outputs: 150mV / 50kΩ

PHONO SECTION SPECS:
Freq Response:
20Hz-20kHz w/ RIAA Equalization of ±0.3dB
S/N: >72dB
Input Sensitivity: 2.5mV @ 50kΩ
Phono Overload: 200mV


From the original Pioneer SA-6500-II Brochure;
"Bass Frequencies Sweet and Clean. The many refinements in the SA-6500-II include a constant-current load construction in the 'pre-driver' stage of the power amplifier. This helps eliminate a time constant at low frequency so that sound quality remains un-muddied and sweet over the whole audible spectrum....Further the power output is enhanced with a power supply using a larger transformer and a pair of 6,800uF, Electrolytic Capacitors for excellent Voltage Regulation so that low-range dynamics never suffer power drain" (means tighter, deeper and 'thumpier' bass!)

Again, we have completely gone through the unit cleaning all contacts, pots, switches and controls as mentioned above. All functions test as original. Simple to use. Unit performs and sounds great! 
Other than a few typical, light scuffs / striations on the sheet metal bonnet, nothing really worth mentioning cosmetically. Unit looks great!
Comes with an 'e-copy', PDF download of the Pioneer SA-6500-II owners / users / instruction manual, brochure and the service manual if the purchaser desires.
Measures 15" wide x 12.25" deep x 5.5" tall and weighs 17 lbs unpacked. Comes with original owners manual and includes our 90 day limited  warranty.
Condition 8.5
PIONEER SA-6500-II

SOLD 3/1/2021
SHIPPING TO KEN IN FLORIDA

(Cons. M.H.)



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


 


 

    



        NEW ADDITION
8/20/19
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REFURBISHED / FULLY SERVICED & WARRANTED
OLD-SCHOOL, 2-CHANNEL STEREO
VINTAGE KENWOOD STEREO INTEGRATED AMPLIFIER
KENWOOD
KA-6004 / KA6004
BIG 'DYNAMIC' POWER AND LOADS OF INPUTS!!!
#...1687
  Circa 1973-76
"WORLD AC POWER"
MIJ

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.

ü Internal fuses checked for correct value / function and replaced where necessary (actually replaced a couple ‘incorrect’ values).

ü Power switch was arching, so it was disassembled, and contacts burnished, re-lubed and re-assembled

ü Solder joints reflowed on Tone Control Circuit Board, and 'Filter Switch' circuit board, and the balance of all possible high heat and stress points

ü Amplifier section had output bias set to correct 40mA from existing (and erroneous) 60+mA.

ü  DC offset set to < 10mVDC either channel from existing 25+mVDC

ü All functions tested for perfect operation.

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

ü Even though all Power and Function Indicator illumination lamps were in working condition, we replaced all; 6x #25-130 and 1x #1302

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.
Total tech time 13 hours.


On our test bench, each internal amplifier of this particular unit, #...1687, produced peak power of 20+ Volts per channel at 8 ohms for 54+ Watts per channel and 17 Volts at 4 ohms for 72 Watts per channel via discrete, metal cased, TO-3 output transistors (2x 2SA744 & 2x 2SC1402).
DC offset set to no greater than 10 mVDC (unloaded) either channels. AC Idle current at 300 mA. Floor noise >-60dBm.
 
____________________________

Great performing, Two-Tone, Silver & Bronze Face, Integrated Amplifier, the Kenwood KA-6004. Brushed aluminum milled face with all original matching brushed aluminum knobs. It's got its share of 'battle scars', most noticeably, dozens of small tics / pecks around the volume knob and a couple dozen around the left side (not sure what someone was doing to cause that), and a few other blems (see photos above). From some angles, the tics / pecks aren't too bothersome, from others, you'll see them. Original, 'Plastic' toggle bats replaced with 'Metal' handles.
Great amp for about any 2-channel, audio system. LOT's of punch and headroom. VERY MUSICAL SOUNDING!!!
Big Power with LOTS of INPUTS!

Kenwood KA-6004 Features include:

 
 
- Discrete Output Transistors
- Large, power supply for plenty of headroom 
- Speaker selector for A or B, A+B or Off 
- Separate Bass and Treble controls, utilizing NOT pots, but a 2dB, 'Wafer Attenuator' and are TRUELY 'de-featable' for purest signal path when set to 'OFF'
- Serviceable, 'Open' body switches for ease of future cleaning
- 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 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.)
- 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.)
- Both Tape I/O's feature DIN as well as standard RCA I/O's
- Dual Phono / turntable inputs with built-in cartridge pre-amp

- Stereo Mode switch for Stereo / Mono-Mix / Stereo-Reverse, L or R selector (very handy for trouble-shooting system and speakers

- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
Dual, Built-in Low / Sub-Sonic filters for cutting turntable rumble / hum. 40Hz and 80Hz
- Built-in High filter for @ 7 kHz. Great for reducing AM noise
 - Instant -20dB Audio-Muting / Volume attenuation

- Front mounted 1/4" stereo headphone jack
- Front mounted. L&R 1/4" 'Microphone' jacks (be careful running microphones into your 'home audio' speakers)
- Rear located 'Mains' protection fuse

 - Pre-Amp out / Power-Amp In RCA loop with built-in Normal / Separate switch (no need for jumpers).

- Quad convenience AC outlets; 3 Switched and 1 un-switched for a total capacity of 300 Watts

- 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.

Kenwood KA-6004 Original Specs:
 
 
Design type: 2 Channels, AB operation
Dynamic Power: 220 Watts / Channel @ 4 Ohms
Rated RMS Output: 40 Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz.
Damping Factor DC-20,000 / 8Ω:
32

Power Bandwidth: 10Hz-40kHz
THD; 0.5% at full rated power (40 W) into 8Ω w/ 20-20kHz.
S/N on Phono MM w/ 2.5mV signal: 68dB
S/N on Tuner / AUX / Tape w/ 110mV signal: 75dB
Input Sensitivity Phono (MM): 2.5mV @ 50kΩ
Input Sensitivity Microphone: 3mV @ 50kΩ
Input Sensitivity Tuner / AUX / Tape: 200 mV @ 100
Input Sensitivity Main Amp: 1V @ 50kΩ
Tape Rec Level (Via RCA's): 200 mV
Tape Rec Level (Via DIN): 40 mV
Bass Control; ±10dB @ 100Hz (2dB 'Step Switch Attenuator)
Treble Control; ±10dB @ 10kHz (2dB 'Step Switch Attenuator)
Subsonic Filter: 40Hz, 12 dB/Oct

Low Filter: 80Hz, 12 dB/Oct
High Filter: 7kHz, 6 dB/Oct

Loudness Control: +8dB @ 100Hz & +3dB & 10kHz (-30dB Vol Level)


Great unit to provide the basis of a medium to medium large sized Hi-Fi system or 'project home studio'. Again, we have completely gone through it as stated above. Again, it's got a few 'battle scars', but that doesn't impede it's performance. Unit functions and sounds great!
Measures 17.2" wide x 11.75" deep x 6.1" tall and weighs 26 lbs unpacked. Includes our 90 day limited warranty!
Cond. 7.5 (due to tics / pecks / blems)
KENWOOD KA-6004
$489.


(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 5/21/18
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY SERVICED
VINTAGE
FISHER INTEGRATED POWER AMPLIFIER
FISHER CA-271 (CA-1271)
FISHER "STUDIO STANDARD"
STEREO INTEGRATED AMPLIFIER

#...8505
Circa late 1980's
MIJ

 SOLD 12/10/20
SHIPPING TO RAY IN TEXAS


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
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs)

- 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®)
- 'CD’ 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

 SOLD 12/10/20
SHIPPING TO RAY IN TEXAS



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

 

 

 

   

NEW LISTING 4/15/20
 (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
YAMAHA STEREO POWER AMPLIFIER

YAMAHA M-45
 #...280Q
Circa 1986

"
WORLD AC POWER"

MIJ

SOLD 4/20/20
SHIPPING TO BENJAMIN IN NEW MEXICO

 Our technician has completely gone through and 'Certified' this unit.
This unit has had complete service which encompassed cleaning everything, including both input attenuators. We also disassembled speaker output circuit board, repaired it and re-soldered both banks of speaker output binding posts and input jacks.
All meter illumination LED's functioning. Inputs tested and both side produces clean and even sine waves into static 8 & 4 ohm loads! No power supply hum of any kind. It's dead silent!
All functions test fine.  Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load for 48 hours.
   
On our test bench the internal amplifiers of this particular unit (#...280Q) produced peak power of 35.5 Volts per channel for 157 Watts per channel at 8 Ohms and 32 Volts at 4 Ohms for 256 Watts per channel via discrete outputs @ 1khz.  
  (4x 2SA1265 & 4x 2SC3182 discrete output transistors. 
 (DC measured at -4.3mv left and -1.1mv right)

 
 ________________________________________
 
 
Great, late 1980's model power amp by Yamaha. The Model M-45. BIG power output! Excellent for 2-channel (stereo) audio listening or for use in an A/V system to power additional Front or Rear channel speakers. Enough power to also work as a project recording studio / band practice power amp as they are more stable at lower impedances than most (if used professionally, would be advisable to use a cooling fan). Lots of punch and headroom. I was a Yamaha dealer when this model was current and made lots of very happy Yamaha power amp owners with this model and it's flanking siblings.

Yamaha M-45 Features:
 
  
- Class "A/B" or " Auto-Class A" selectable modes 
 
- 2- Channel stereo operation
- A / B speaker selector via high current relay
- Dual, Vertical, 10-Segment LED Power Output Meters
- Built-in Protection circuits
- 24 Karat Gold plated input jacks to remain corrosion free, thus insuring the best audio signal transfer.
- Oversize power supply transformer with dual 22,000 uf / 69-Volt filter caps built by Nichicon exclusively for Yamaha, and heavy duty bridge rectifier with oversize heat sink
- Dual, vertically finned, unfinished aluminum, internal heat sinks for very efficient heat transfer / evacuation and completely vented from bottom thru top for maximum cooling (all electronics manufacturers should do this as well)
- 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.
- Rear-mounted AC convenience outlet with a capacity of 200 Watts

  
 
Yamaha M-45
Original Specs:
  
 

Design type: 2 Channels

Rated RMS Output: 125 Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz.
180 Watts RMS continuous @ 4 Ohms @ spec
- Max dynamic power output up to 390 Watts per channel @ 2 Ohms
Dynamic Headroom: 1.3dB @ 8 Ohms & 2+dB @ 4 Ohms
Damping Factor: @ 1kHz / 8Ω: >
70
Signal / Noise: >123dB
!!!
THD; 0.003% at full rated power (125w) into 8
Ω w/ 20-20kHz
Power Bandwidth: 10Hz-60kHz @ 8Ω
Input Sensitivity: 1.1V
Channel Separation: 89dB @ 1k (Vol -30dB)
   

Again, we have completely gone through this Yamaha M-45, stereo power amp. It is in fabulous cosmetic condition. Very little visible wear. Works and sounds great!
Includes an 'e-copy' pdf download of the Yamaha M-45 owners / users / instruction manual if the purchaser desires. Unit  measures 17.25" wide x 16" deep x 6.5" high and weighs 28 lbs unpacked. Includes our standard 90 day limited  warranty.
SERVICED YAMAHA M-45
Condition 8.5++

 (C) R.R.

SOLD 4/20/20
SHIPPING TO BENJAMIN IN NEW MEXICO

 

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

 archived

 

 

 

        

 


     NEW ADDITION
8/16/19
 (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY SERVICED & WARRANTED
OLD-SCHOOL, 2-CHANNEL STEREO
VINTAGE KENWOOD STEREO INTEGRATED AMPLIFIER
KENWOOD
KA-501 / KA501
#...5479
  Circa 1980-84
MIJ

SOLD 4/23/20
SHIPPING TO ROBERT IN OHIO


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

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

ü Internal fuses checked for correct value / function and replaced where necessary (actually replaced a couple ‘incorrect’ values).

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

ü Amplifier section had output bias and DC offset checked 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 Power meter illumination lamps in working condition

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.
Total tech time 6.5+ hours.


On our test bench, each internal amplifier of this particular unit, #...5479, produced peak power of 26+ Volts per channel at 8 ohms for 84+ Watts per channel and 22.5 Volts at 4 ohms for 126 Watts per channel via discrete output transistors (2x 2SA1094 & 2x 2SC2564).
DC offset set to no greater than 35 mVDC (unloaded) either channels. AC Idle current at 125 mA. Floor noise >-60dBm.
 
____________________________

Great performing, Silver Face, Integrated Amplifier, the Kenwood KA-501. Brushed aluminum milled face with all original matching brushed aluminum knobs. It's got a few 'battle scars', such as a missing power switch bat (still usable), some scuffs on the bezel around the power meters, a few scuffs / striations on a knob or two, a few tics along the top edge, and some bumps and bruises to the top, sheet metal covering, but overall, still great looking. Great amp for about any 2-channel, audio system. LOT's of punch and headroom. Check out the 'Slew Rate' and 'Damping Factor' in the specs. Very Impressive! Among the best we have seen in 'consumer' grade audio equipment and way beyond many 'Pro' audio power amps!
Big Power very musical sounding amp.

Kenwood KA-501 Features include:

 
 
- Discrete Outputs
- Large, power supply for plenty of headroom 
- Speaker selector for A or B, A+B or Off 
- Separate Bass and Treble controls, utilizing super quality de-tented pots and are 'de-featable' for purest signal path
- 'DC' switch to 'Direct Couple' signal path for purest audio
- Oversize Volume control pot utilizing super quality de-tented type
- Phono / turntable input with built-in cartridge pre-amp

- Dual Tape Monitors with 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)
- 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.)
- Tape Dubbing A->B Capability
- 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.)
- Tape B features DIN as well as standard RCA I/O's
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Built-in Low / Sub-Sonic filter for cutting turntable rumble.
- Front mounted 1/4" stereo headphone jack
- Binding Post Speaker connectors
- Oversize, Rear 'Service Bumpers'

- Triple convenience AC outlets; 2 Switched and 1 un-switched for a total capacity of 500 Watts

Kenwood KA-501 Original Specs:
 
 
Design type: 2 Channels, AB operation
Rated RMS Output: 70 Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz.
Transient Response:
Damping Factor DC-20,000 / 8Ω:
60
Rise Time DC-20,000 / 8Ω:
1.0 μs
Slew Rate DC-20,000 / 8Ω:
110 V/μs (All Very Impressive!)
Power Bandwidth: 5Hz-40kHz @ 0.03% THD @ 8Ω
THD; 0.03% at full rated power (70W) into 8Ω w/ 20-20kHz.
Potential Frequency Response: DC Coupled 'On' = 50-300kHz +0dB / -3dB
S/N on Phono MM w/ 2.5mV signal: 86dB
Input Sensitivity Phono (MM): 2.5mV @ 50kΩ
Input Sensitivity Tuner / AUX / Tape: 150 mV @ 50kΩ
Phono MM Maximum Input Level: 240mV
Phono Frequency Response (RIAA standard Curve
± 0.3dB): 20Hz-20kHz
Tape Rec Level (Via RCA's): 200 mV @ 120Ω
Bass Control; ±10dB @ 100Hz
Treble Control; ±10dB @ 10kHz
Subsonic Filter: 18Hz, 12 dB/Oct

Loudness Control: +8dB @ 100Hz (-30dB Vol Level)


Great unit to provide the basis of a medium to medium large sized Hi-Fi system or 'project home studio'. Again, we have completely gone through it as stated above. With the exception of the above mentioned issues, the unit is in decent cosmetic condition. Unit functions and sounds great!
Measures 17.5" wide x 16.25" deep x 6.25" tall and weighs 24 lbs unpacked. Includes our 90 day limited warranty!
Cond. 8.5
KENWOOD KA-501

SOLD 4/23/20
SHIPPING TO ROBERT IN OHIO

(Cons. M.H.)



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

archived
  


 

 

         

NEW LISTING 3/16/20
(Click on above thumbnails to enlarge photos) 
CheckMarkSmall_web.jpg (792 bytes) warranty
PRE-OWNED FISHER INTEGRATED POWER AMPLIFIER
FISHER CA-276
STEREO INTEGRATED AMPLIFIER
"210 WPC MONSTER"

#...8451
Circa late 1980's
MIJ

SOLD 3/25/20
SHIPPED TO DARYL IN D.C.


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 solidly. Controls are smooth and silent.

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 All Controls / Switches cleaned where necessary and test for quietness ('Balance' control has remaining issues near it's extreme right and left, but works as intended throughout the majority of it's range.)

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 Great looking with no cosmetic issues and unit looks near NEW.

ü Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours.

On our test bench, each internal amplifier of this particular unit, #...8451, produced peak power of 41Volts @ 8Ω per channel for 210 Watts / channel and 27 Volts @ 4Ω per channel 182 Watts / channel via 8 discrete output devices at 1kHz. (4X 2SC3182 & 4X 2SA1265). AC Idle current at .40A. DC offset adjusted to <20 mV L&R. Floor noise <0.3 mVAC.
____________________________


This Fisher CA-276, 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. It's got a massive power supply transformer, with 'forced air / Wind-Tunnel' cooling via temp controlled electric fan. 

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. Monstrous internal power supply, relative to most amps in it's range. Not that I place a lot of stock in specs, take a look at them. They're all around impressive. This was a 'Military / PX' / 'Euro / Asia' market unit and was not readily available in North America. While it's got a few 'battle scars' (see photos above), they of course don't affect it's spectacular performance.

 
____________________________

Fisher CA-276 Features include:

- Eight 'Discrete' output transistors for lot's of punch and tone!!!!

- 4-Way Built-in Protection
- Internal Cooling Fan comes on when internal temperature reaches
85° Celsius
- 2-Band, Quasi-Parametric EQ (enables a cool 'Wah-Wah' filter effect by rapidly sliding the 'frequency' control)
- Infinitely variable ‘Turn-Over’ frequencies for both Bass and Treble
- ‘EQ Defeat’ for purest signal path and most un-adulterated sound
- Independent speaker selector switches for A, B, A+B, Off
- Phono / Turntable input with Built-In Phono Pre-Amp
- ‘Tape-2’ is a 'TRUE' 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® / 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-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
- Stereo / Mono Selector
- Dual 12-Segment, Fluorescent Level Meters
- Meter Range Selector
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Subsonic Filter to eliminate excess rumble from sources such as turntables
- Pre-Out / Power-Amp-In Loop
- Front mounted, ¼”, Stereo headphone jack
- Heavy Duty Speaker Binding Posts


Original FISHER CA-276 Specifications:

AMP SPECIFICATIONS:
Power output:
150WPC min RMS @ 8 Ohms & no more than 0.009% THD @ 20-20kHz
THD;
<0.009% @ full rated power
IHF IMD;
0.009% @ 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:
100dB (line)
Input sensitivity - Phono / All Others:
2.5mV (MM) /  150mV (all at 50kΩ)
Quasi-Parametric EQ / Tone Control section characteristics:
Bass 25-800 Hz w/ ±12dB
 Treble 600-20kHz w/ ±12dB
Hi-Filter (above 10kHz): -6dB
Subsonic / Low-Filter (Below 10Hz):
-12dB (this is an INCREDIBLE 'Sub-Filter' both in freq and slope)
Loudness Control;
+8dB @ 100Hz  and +4dB @10kHz
Max Power Consumption;
850 Watts


PHONO SECTION SPECS;
Freq Response;
20Hz-20kHz w/ RIAA deviation of ±0.2dB
S/N;
>75dB
Input Sensitivity;
2.5mV @ 50kΩ
Phono Overload;
200mV


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, it's got a few 'battle scars' (mostly not visible from the front), but nothing too distracting. Unit Performs and sounds great!
 We can include an 'e' copy, PDF of the Fisher CA-276 Service manual if the purchaser wishes. Measures 17.25" wide x 6.5" tall x 11.5" deep and weighs an impressive 28 lbs unpacked. Includes our standard 90 day limited warranty.
 Cond. 8
FISHER CA-276 INTEGRATED AMPLIFIER

SOLD 3/25/20
SHIPPED TO DARYL IN D.C.

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

(archived)

 

 

 

 

    

         NEW LISTING 3/21/19
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes) warranty
REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE TECHNICS STEREO INTEGRATED AMPLIFIER
TECHNICS SU-7300 / SU7300
#...B051

MIJ
Circa 1976-78 


SOLD 4/22/20
SHIPPING TO LARRY IN MISSISSIPPI


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 (actually replaced a couple ‘incorrect’ values).

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

ü  Amplifier section had output bias and DC offset checked 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  Power meter illumination lamps replaced with new, fresh bulbs (even though originals were working, old lamps commonly don’t survive SHIPPED)

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. (Technicians note, "this is a fairly 'tech friendly & serviceable' amplifier design")
Total tech time 5+ hours.


On our test bench, each internal amplifier of this particular unit, #...B051, produced peak power of 20.5 Volts per channel at 8 ohms for 55+ Watts per channel and 17 Volts at 4 ohms for 76 Watts per channel via discrete output transistors.
DC offset set to no greater than 10 mVDC both channels. AC Idle current at 270mA. Floor noise >-60dBm.
 
____________________________
 

This Brushed Aluminum Face Technics SU-7300 Stereo Integrated Amplifier looks and sounds great! Great amp for 2-channel stereo systems up to medium-large and "recording studio" use. "Real" output transistors and substantial power supply! Just a great 'all-around utility' amplifier for probably more than 80% of the audio systems out there.
 
Technics SU-7300 Features include:
 
- Real Class A/B amplifier architecture
- Large (2.5 inch wide), dual analog VU power meters w/ ‘Dual’ ranges
- A or B speaker select
- Super quality de-tented volume control
- Separate Bass and Treble with high quality de-tented controls
- Dual tape deck monitors with 'Tape-2' having a DIN as well as RCA I/O's. (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / 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
- Phono / Turntable input w/ built-in Phono Pre-Amp

- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRIUS® etc. inputs)
- Loudness function to increase ‘fullness’ of sound at lower volume levels by accentuating the Lower and Upper frequencies relative to the mid range.
- Meter range select (x1 or x0.1)
- Built-in High filter for reducing 19 kHz FM pilot tones and tape hiss and AM noise

- Front mounted
¼" stereo headphone jack
- Back panel features full RCA patch bay for all inputs. Binding post speaker connectors for A&B and Dual AC convenience outlets 1 Switched and 1 un-switched AC outlets for a maximum load of 250 watts of external gear.

 
Technics SU-7300 Specifications:
 
 
Output: Continuous 41 Watts per channel, min. RMS, at 8 Ohms & 48 Watts per channel, min. RMS, at 4 Ohms, both channels driven, from 20Hz to 20kHz.
Design type: 2 Channels, Integrated Pre /
 Class A/B operation Power Amplifier
Damping Factor: >40@ 20-20kHz into 8Ω
THD and IMD: 0.08% at full rated power into 8Ω w/ 20-20kHz & 0.04% @ half power
Freq Response of Pre-amp: 7Hz-80kHz
S/N: 97dB for Tuner, Tape and AUX inputs
Bass Control:  ±12dB @ 50Hz
Treble Control: ±12dB @ 20kHz
High Filter:  -6dB / oct @ 8kHz
Loudness Control: +8dB @ 100Hz (-30dB Vol Level)
Input Sensitivities: Non-Phono inputs = 150mV / 47kΩ
Tape outputs: 150mV

PHONO SECTION SPECS:
Freq Response:
RIAA standard w/ RIAA Equalization of ±0.3dB
S/N: >78Db
Residual hum and noise: 0.6mV
Input Sensitivity: 2.5mV @ 47kΩ
Phono Overload: 150mV


Again as stated earlier, the Amp has had our standard FULL SERVICE inside and out including cleaning all control pots and contacts, replacing any necessary parts, and completely tested. All functions have been tested and pass with flying colors! New meter lamps installed for trouble-free service. Face and knobs are in excellent condition. Unit looks and sounds great! Measures 17½" wide x 14" deep x 5½" tall and weighs 20 lbs unpacked. Includes our 90-day limited warranty!
TECHNICS SU-7300
 Cond. 8.5

 SOLD 4/22/20
SHIPPING TO LARRY IN MISSISSIPPI

(Cons. M.H.)


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

archived

 

 

 

 

    

         NEW ADDITION 8/20/19
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CheckMarkSmall_web.jpg (792 bytes) warranty
FULLY SERVICED WITH WARRANTY
VINTAGE TUBE CLASSIC!
DYNACO / DYNAKIT PRE-AMP / CONTROL AMPLIFIER
DYNAKIT PAS-2

#...6855
Circa 1964-69
FACTORY BUILT VERSION
MADE IN AMERICA

SOLD 8/13/2020
SHIPPING TO DARRELL IN OREGON


ü Two technicians have completely gone through this unit. First an 'old-school, outside' shop, versed in tubes prior to it reaching us, then by our senior tech. The procedures outlined below will be spread between the two shops.


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

ü Power transformer replaced

ü All existing tubes tested fine (4x German Dynaco / Telefunken 12AX7 & 1x USA Tungsol 6X4 Rectifier tube)

ü New Electrolytic Filter capacitors

ü Selenium rectifier replaced with Silicone Diodes at some point in it's past (always preferable)

ü 12X4 replaced with 6X4 at some point in it's past (common mod)

ü Other various resistors and capacitors replace per previous service work

ü New #1893 Pilot lamp installed which taller than original, thus increasing brightness of Orange jewell

ü Unit All RCA I/O jack terminal solder joints re-flowed internally

ü Unit cosmetically detailed, but does have a few scratches on the metal case /cover and various 'marks / stains' to the brass face panel (see photos above)

ü 
All functions tested for perfect operation.

ü All inputs tested fine following I/O re-flow operation

ü Both sides produce clean and even sine waves!

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

  
Classic, Tube Pre-Amp. These have been a 'Vintage Hi-Fi Mainstay' for decades. Great pre to build a system around. GREAT sounding as well. Not a fan of the I/O jack labeling (or lack there-of), but that was an earlier time.

DYNAKIT PAS-2
Features include:
  
- 5-Tube circuitry
- Partial Point to Point wiring design

- Separate L&R Bass and Treble Controls
- Stereo / Mono / BLEND control
- Tape monitors with A>B dubbing
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Spare (AUX / CD)
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Separate AM or FM Mono or FM Stereo inputs
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRIUS® etc.)
- Phono / Turntable input with Built-In Phono Pre-Amp
- Tape Head Input. This is used for connecting a 'transport only' type, Reel to Reel tape deck
- "Special" input. This is currently somewhere between 'Tape-Head' and 'Phono' level. It is an input that can be internally wired for a number of input configurations, including a second turntable, magnetic or crystal cartridges, microphones or specifically for 78 RPM records or...etc.

- 'Scratch' / Hi-Filter for reducing 'hiss' in AM etc.

- Loudness selector
- 4 AC outlets, All un-switched

Dynakit PAS-2 Original Specs:
  
 
Design type: 2 Channels, Analog operation

Transient Performance; "Pass square waves without ringing and with minimum deformation from 20-20kHz. No 'over-shoot or bounce on 'pulse type' signals. Instantaneous recovery from overload (means great damping factor and fast slew rate)
THD Tuner, AUX and Tape, 20-20,000Hz: 0.05%
@ 1V output
Hum & Noise: "2 microvolt equivalent noise on RIAA. 74dB below level of 10 mV signal."
Bass Control; ±20dB @ 20Hz
Treble Control; ±14dB @ 20kHz

  
This is one of the most famous of the vintage pre-amps. All Tube design, and surprisingly 'quiet'. Rear I/O label faded, so we're including a 'printed sheet' with the I/O labels. Unit looks good, works and sounds great! Measures 13" wide x 4.25" tall x 8.5" deep and weighs 8 lbs unpacked. Includes 30 day limited warranty, not applicable to tubes.
FACTORY BUILT, DYNAKIT PAS-2

Cond. 8

SOLD 8/13/2020
SHIPPING TO DARRELL IN OREGON


with originally installed, Four German made, Dynaco / Telefunken 12AX7 tubes!!! (as well as the USA 'Tungsol')

(CONS. R.R.)

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


  

 

 

 

    

NEW LISTING 11/2018
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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
- While we did test this stable to 4 Ohms, it is likely rated for a min of 6 Ohms as that what it's 'spec' rating is (no minimum rating stated on rear panel)
- 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
ON HOLD FOR SHOP / OWNERS USE 12/21/18
 
Here's a link to an original review of it...

 
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**
"(actual as measured)" refers to original test results done by Hirsch-Houck Laboratories upon test release of product when new. Current "aged" specifications / performance may of course vary from that.

 

 

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