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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:
 

Onkyo_P306RS_Pre-amp_temp.jpg 

 

NEW LISTING 1/10/14  
(Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED  
ONKYO
P-306RS / ONKYO STEREO PRE AMPLIFIER
'Military / Euro-Asia' Market Unit 
Circa 1980-85
"WORLD AC POWER" ™
MIJ

for sale
Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all contacts, switches and controls. Unit looks like NEW! All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Other than a minor 'ding' on the bottom, side edge or the left panel, the unit looks near NEW!
 
 Versatile, Onkyo P-306RS Pre-amp / control center This is a fabulous looking, performing and sounding pre-amp. Great for 'mid to upper-end' audio systemsAs this was a unit intended for the Euro-Asia and Military market, it was not available to the 'North American' market, so about the only way one of these units would end up here is if a GI brought it back from tour. We actually get a large proportion of GI gear here at Oak Tree Vintage.
 Onkyo P-306RS Features include:
 

 - 'Super Servo' connections / indicator when using other Onkyo 'Super Servo' compatible gear

- Super quality internal parts

- Onkyo's 'Super Servo Circuitry' noise cancellation

 - Separate Bass and Treble with 'True Tone Defeat'

- 24k Gold I/O RCA jacks


- Pre-Amp signal Stereo / Stereo Reverse / Mono L+R, L or R input selector (very handy for verifying un-balanced sources and for trouble shooting system)

- Dual Phono / Turntable inputs

 - Phono / Turntable input with selector for either MM (Moving Magnet cartridge) or MC (Moving Coil Cartridge) (this feature alone could be worth hundreds of $$ if you are going to utilize a Moving Coil turntable cartridge)
 - Cartridge capacitance selector on the MM or MC

- Triple RCA outputs (one to utilize Onkyo's 'Super Servo' technology


 - Tuner / AUX Input
(may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)

 - CD Input
(may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)

 - Dual Tape Inputs / Outputs (not 'Tape Monitors')
(may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)

  - Record Out selector with bi-directional tape dubbing controls. (Separate "Record Out" allows recording from one source while you listen to another)

   - Subsonic filter for reducing turntable rumble / feedback with selectable filter point of either 15Hz or 20Hz

- -20dB Audio Muting


- LED status indicators for 'Input' and 'Record Source' functions

- Internal 'high mass' (~5lbs) plate mounted over circuitry to reduce externally induced acoustic anomalies (maybe 'hoodoo-voodoo', but you can decide)

- Gorgeous Rosewood side panels

- 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.
 
Onkyo P-306RS Specifications:
  
  Design type: 2 Channels
 Input Sensitivities (non phono inputs): 150mV / 47KΩ
 S/N: 103dB for all 'non phono' inputs
'Non-Phono' input Frequency Response: 0.8Hz - 170kHz +0 / -3dB
 Output: Tape Rec; 150V/ 560Ω
 Pre Out max; 1000mV
 THD (on 'non-phono' inputs): 0.0015% w/ 20-20kHz @ 3V
 IMD (on 'non-phono' inputs): 0.0015%

Audio-Muting;  -20dB
 Bass Control Characteristics;  ±8dB @ 70hz
 Treble Control Characteristics;  ±8dB @ 10khz (manual states at "20kHz", but that may be a 'mis-print. Just FYI per Jerry at www.oaktreevintage.com .)
 Treble Filter;  6dB / Oct @ 7khz
 Low Filter;  '6dB /Oct @ 15hz or 20Hz selectable


 
PHONO SECTION SPECS;
 Freq Response;
20-20kHz

 S/N Input shorted;
92dB with MM cart or 83dB / W/ MC

 Input Sensitivity / impedance; 2.5 mV / 47k or 100kOhms w/ MM & 2.5mV / 100Ohms 'High MC' or 130uV / 100/220Ohms for 'Low MC'
 Overload limit; 300 mV @ 1K or 1400mV @ 10kHz

 THD: 0.002% w/ 20-20kHz @ 3V on MM OR 0.003% W/ MC

 
Our
technician has completely refurb'd this Onkyo P-306RS, stereo Pre-Amp, cleaning and testing all and it gets our full 'Certification'. Great control / pre-amplifier for just about any stereo system / power amp. Unit looks and sounds great! Comes with an 'e' copy, pdf download of the Onkyo P-306RS owners / users manual. Unit measures 19" wide x 4" tall x 15.75" deep and weighs 24 lbs unpacked. Includes our standard 90 day limited warranty.
ONKYO P-306RS STEREO PRE-AMP
 Cond. 8.5++
$549.
(C) M.R.

 

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

 

   


POWER AMPS:
 

Onkyo_M-506RS_Stereo_Power_Amplifier-Amp_web.jpg     Onkyo_M-506RS_Stereo_Power_Amplifier-Amp_collage.jpg

Onkyo_M-506RS_Stereo_Power_Amplifier-Amp_Power-supply_collage.jpg  

NEW LISTING 3/26/14
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED
ONKYO M-506RS POWER AMPLIFIER
ONKYO STEREO POWER AMP

'Military / Euro-Asia' Market Unit 
 
Circa 1980-85
"WORLD AC POWER" ™
MIJ

for sale
Our technician has completely gone through and 'Certified' this unit. Unit bench checked, necessary repairs made, cleaning / detailing inside and out, fully tested and Certified. Our technician reset the voltage to correct 120vAC. New bulbs / lamps installed for 'Power', 'Servo', and 'Speaker Selectors'.
Performs 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 for 48 hours and it functioned flawlessly (we actually took it into our 'demo' system and 'rocked-it' HARD on our Altec VOTT's. HUGE sound and thump).
From the original Onkyo M-506RS manual,

"...Large, independent left and right power supplies, with large capacity, chemical capacitors have been provided to enable extremely low power supply impedance. Super Servo on both the hot and ground signal sides reduce variations in the power supply for larger inputs to under 1/100th (-40dB), creating a nearly perfect power supply".
(See photos above of power supply)
And as we all (should) know an amp is only as good as it's power supply!
Also from the manual,
"The output stage uses high fT transistors in a 3-stage Darlington configuration. Distortion usually associated with 'Class-B' amplifiers is virtually eliminated, and Onkyo's unique Linear Switching radically reduces both switching and crossover distortions. In addition, an auto-tracking bias system is used to prevent instabilities in the bias current due to thermal variations".

On our test bench, this particular Onkyo M-506RS power amplifier, #...1883, unit's amplifiers produced 36.6 volts at 8 Ohms per channel for 167 continuous watts, and 32.3 volts @ 4 Ohms for 260 watts / channel via 8 (eight) discrete, output transistors. (4X 2SA1301 & 4X 2SC3281). (Idle AC current draw @ .6A. & DC offset out = <2.75mV on either side. Floor noise measured at 0.03mVAC either side)

This is a Huge and Beautiful looking, performing and sounding power amplifier. High gloss, rosewood side panels frame a 'unit wide' smoked glass face in front of HUGE VU power meters. Very Elegant! Only cosmetic issue is a scuffed area in the clear coat on the front edge of one of the side panels (see photos above). Could probably be 'rubbed out' by someone capable, but that's 'beyond our pay grade'. As this was a unit intended for the Euro-Asia and Military market, it was not available to the 'North American' market, so about the only way one of these units would end up here is if a GI brought it back from tour. We actually get a large proportion of GI gear here at Oak Tree Vintage.

Onkyo M-506RS
Features:

- DUAL power supplies (has a lot to do with how much this amp 'punches'. That, and the EIGHT output transistors.) (See photos above of power supply)

- 'Super Servo' when using compatible 'Super Servo' pre-amp (we didn't use it to audition)
- 'Low Speaker Impedance' protection
- DC protection for 'Turn-On Surge' and 'Output'

-
A and / or B speaker selector
- Front mounted 'Gain / Level' controls
- Huge, Beautiful, Lit VU Power Output meters

-
Meter Range selector for either normal or 'x 0.1'
- 1/4" Stereo headphone jack

- Signal inputs via standard RCA jacks
- Heavy duty binding post speaker outputs
- Power On, 'Super Servo' engaged, and 'Speaker Selected' indicators

- 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.

Onkyo M-506RS Specifications:

- Rated RMS Output: 150 watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz.
- Frequency Response:
1Hz to 100kHz
@ 8Ω, both channels driven
- Signal to Noise Ratio: 122dB (20Hz to 20kHz) at full RMS output
- Total Harmonic Distortion (THD): <0.002% @ rated output
IMD; 0.0015% @ rated power /
- Damping Factor: 180 @ 8 Ohms / 1Khz
- Load Impedance: Rated for 16, 8, 4 ohm use
- Input Impedance: 47K Ω nominal
- Input Sensitivity: 1V for rated power into 8Ω
- Output Connector: Heavy duty, 3-way binding posts
- Input Connector: 24k Gold Plated RCA jacks
- Output Monitor: Heavy Duty Banana / Binding posts

Again, as stated before, we have completely gone through this Onkyo M-506rs, Power Amplifier cleaning and testing all and it gets our full 'Certification'. This is an amazing performing and sounding amp. We have 'stood on it' hard, with a number of our speaker loads (the most fun being when connected to our Altec 'Voice of the Theaters'. It's a huge sounding and punchy amp, with lots of 'head room'. Handles 'REAL' high power levels perfectly well. If you are looking for serious, vintage power, it ain't gonna get much better than this.
 Comes with an e-copy, pdf download, of the Onkyo M-506RS Owners Manual and Service Manual.
 Measures standard 18 7/8" wide x 16 5/8" depth x 6 7/8" tall and weighs 43 lbs unpacked. Includes our standard 90 day limited warranty.
ONKYO M-506RS POWER AMPLIFIER
 Cond. 8.5 (only due to scuff on side panel edge)

$689.
(C) M.R.

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


 

 

Hafler_P-225_Power-Amplifier-Amp_web.jpg     Hafler_P-225_Power-Amplifier-Amp_collage.jpg

NEW LISTING 3/26/14
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE
HAFLER STEREO POWER AMPLIFIER
HAFLER P-225 'PRO AUDIO' AMPLIFIER
OAK TREE VINTAGE'S SPEAKER AUDITION AMP
#...1809
Circa 1984-87
MADE IN U.S.A.

for sale
Our technician has completely gone through and 'Certified' this unit. Unit bench checked / tested. All functions have been tested and pass with flying colors!  Power output section features oversized, externally located, vertical, 'thin' finned aluminum heat sink for very efficient and silent, passive cooling of HUGE output devices. Both inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent!
This amp has actually been our 'speaker audition' amplifier here at Oak Tree Vintage for a number of years, and has performed flawlessly. It is the amp that 95% of our speakers have been auditioned and evaluated on
. The only reason we have changed it is to move up to 500 watts per channel for testing some of the 'pro-audio' boxes we get through (although we can't hear any difference in level between this Hafler P-225 and our replacement amp, and I believe, due to the 'mosfet' outputs, this amp is a bit 'punchier'.
   

   While this amp is originally rated at 115 watts with both channels driven, on our test bench, this particular unit's (#...1809) amplifiers produced 34 volts at 8 ohms per channel for 145 watts / channel and 28.5 volts at 4 ohms per channel for 203 watts / channel via discrete 'Mosfet' output transistors. (Idle AC current draw @ 1.2A.
DC less <20mVDC / Ch.
Floor noise measured at L= 0.00mVAC and R=0.00mVAC

   

Hafler amps have always been known for understated appearance and performance. I sold Haflers as new, when this model was current and while they were never much on looks, they made up for that in performance. Excellent for 2-channel (stereo) audio listening or for use in an A/V system, studio monitors, PA / Pro Audio use and it's momentarily stable into 2 Ohms!!! Lots of punch (check the 'Slew Rate', 'Damping Factor' and 'Rise Time' and you'll see why).
Hafler P-225 Features:
   

- Mosfet Outputs
- 2- Channel stereo, Class A/B operation
- Bridge Mono capable
- Built-in Thermal Protection circuit (have never had it trigger and we've stood on some speaker 'hard' with this amp)
- Floating or 'Chassis' ground selector
- 1/4" / Phono / #280 input jacks (could be converted to XLR if desired)
- Very efficient, vertically finned, internal heat sink
- Oversize power supply transformer and outputs
- 3-Way, Binding post speaker jacks
- Rear mounted 'Gain / Level' controls
- 3-Prong / Grounded AC cord (yes, the ground pin is still intact!)

   - Dual Rear-mounted speaker protection fuses
- 3-U Standard Rack Mountable Design
   
 Hafler P-225 Original Specs:
 "115 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.02% THD"
Design type: 2 Channels, AB operation
 Slew Rate @ 10kHz / 8Ω: >30V/
μsec
 Rise Time @ 10kHz / 8Ω: >30V/
μsec
 Damping Factor @ 1kHz & 10kHz / 8Ω: >300 & 60
 Transient Overload Recovery Time: 2.5
μsec from 10-90% peak & @ 10kHz
Signal / Noise: >100dB @ 115 watts
Input Sensitivity: 1.55V for 115 watts
Input Impedance: 47k Ohms in parallel w/ 50k Ohm level control

Channel Separation: 85dB @ 1kHz
  Rated RMS Output Stereo: 115 watts per channel, min. RMS, @ 8
Ω
, / 175 wpc @ 4 Ohms, both channels driven, from 20Hz to 20kHz.
Rated RMS Output Bridged / Mono: 350 watts per channel, min. RMS, @ 8Ω, / 230 wpc @ 16 Ohms, both channels driven, from 20Hz to 20kHz.

'Dynamic'
Power; 200wpc @ 2Ω & >350 Watts in bridge mono @ 8 Ohms
 

THD; 0.02% @ @ rated power / @ 1kHz
IMD; 0.005% @ rated power /
   Power Bandwidth: 6Hz-60kHz @ 8Ω
Wall AC current needed:
830 Watts
 
If you missed it above, this has been THE amplifier (yes, the actual one) that we have been using for many years now to audition EVERY speaker we have posted to the sight, with the exception of the last 6 months or so, and are only changing to more power to handle some of the larger 'PA' cabs that occasionally come through. Again, as stated before, our technician has completely tested this NAD 2150, stereo Power-Amp (although we've been 'real world' testing it for about 8 years now,  and it gets our full 'Certification'.  With the exception of a few minor 'dings' / nicks and scuffs, the unit looks decent (see above photos). Unit looks, works and sounds great! Again, Hafler amps are known for incredible punch, headroom, and musicality. I sold many Hafler products when new, and don't ever remember a complaint from any one who purchased one. Only compliments! Includes an 'e-copy' pdf download of the Hafler P-225 / P-230 owners / users / instruction manual.
Unit
measures 'standard rack mount width' at 19" wide x 10.5" deep x 5.5" high (w/ feet installed) and weighs 32 lbs unpacked. Includes our standard 90 day limited warranty.
HAFLER P-225, 2-CHANNEL STEREO POWER AMP
Cond. 8
$649.
(C) M.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 owners / users manual. Unit measures 17" wide x 12" deep x 3.75" high and weighs 23 lbs unpacked. Includes our standard 90 day limited warranty.
B&K AV2500 MULTI-CHANNEL POWER AMPLIFIER
Cond. 8.5
$599.

 

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

  

 

  

Dynaco_Stereo-120_Power_Amplifier_Web.jpg     Dynaco_Stereo-120_Power_Amplifier_Collage.jpg

NEW LISTING 3/31/14
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE
DYNACO STEREO POWER AMPLIFIER
DYNACO "STEREO 120" POWER AMP
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. Unit bench checked / tested. 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's amplifiers produced 21.8 volts at 8 ohms per channel for 59 watts / channel and 18 volts at 4 ohms per channel for 81 watts / channel via discrete, metal cased, TO-3'output transistors. (Idle AC current draw @ 0.46A.
DC less <3mVDC / Ch.
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.
   

- 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 @ 20kHz-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, @ 8
Ω
IMD; <0.5% @ rated power /
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'.  With the exception of a some minor blemishes to the chrome (inevitable on these amps), the unit looks decent (see above photos). 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 standard 90 day limited warranty.
DYNACO STEREO 120, 2-CHANNEL STEREO POWER AMP
Cond. 8
$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)

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

NEW LISTING 3/31/14
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED
KENWOOD POWER AMPLIFIER
KENWOOD KM-208 KM208 AMP
#...1236
Circa 1985-86
MIJ
for sale
Our technician has completely gone through and 'Certified' this unit.
Unit bench checked / tested. Amp has been cleaned inside and out. Face removed, meter illumination lens removed, cleaned and reattached. All new panel illumination lamps replaced with new. All functions have been tested and pass with flying colors!
Amp designed using Huge Power Supply Transformer and oversized, vertical finned heat sink for very efficient and silent, passive cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous volume for 72 hours straight and it functioned flawlessly.
   

While this amp is originally rated at 150 watts with both channels driven, on our test bench, this particular unit's (#...1236) amplifiers produced 38.5 volts at 8 ohms per channel for 185 watts / channel and 30 volts at 4 ohms per channel for 225 watts / channel via discrete output transistors (2x 2SA1216 & 2x 2SC2922. (Idle AC current draw @ .3A.
DC offset out L= 5.5mV & R= 6.4mV.
Floor noise measured at L= 00.0mVAC and R=00.1mVAC

   

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

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

   
Kenwood KM-208 Original Specs:
 "150 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.015% THD"
   Design type: 2 Channels, AB operation
 Damping Factor @ 1kHz / 8Ω: 35
  Rated RMS Output: 150 watts per channel, min. RMS, @ 8
Ω, both channels driven, from 20Hz to 20kHz.
Music Power 314 watts per channel
THD; 0.015% @ half rated power / 8Ω w/ 20-20kHz
0.001% @ half rated power / 8Ω w/ 1kHz
IMD; 0.002% @ rated power /
   Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
   Potential Frequency Response: 5Hz-200kHz
Damping Factor; >35 @50Hz / 8 ohms
Signal / Noise; 120dB A weighted
 
    
 Again, as stated before, our technician has completely refurb'd this Kenwood KM-208, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. Great 'all around' power amp for about any audio system. We have sold MANY of this series of Kenwood power amps, with never a complaint. Includes an 'e-copy' pdf download of the Kenwood KM-208 owners / users / instruction manual Unit looks, works and sounds great! Unit measures 16.5" wide x 10.5" deep x 4.75" high and weighs 20 lbs unpacked. Includes our standard 90 day limited warranty.
KENWOOD KM-208
Cond.
8.5
$399.
(C) K.K.

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

 

 

 

Audio_Centron_RMA_1000_Stereo_Amp_web.jpg

 
Audio_Centron_RMA_1000_Stereo_Amp_collage.jpg

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

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

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

for sale

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

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

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

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

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

- Grounded AC input cord


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

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

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

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

- Bridge / Mono mode operation ( 440 watts @ 4 ohms)


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

Measures 19" wide x 16.5 overall depth / 13.5" rack depth x 3.5" tall and weighs 35 lbs unpacked. Includes our standard 90 day limited  warranty.
AUDIO CENTRON RMA-1000
Condition 8
$299.

 

(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 one of the best Car Audio sites and stores in the world, 'Car-Fi' www.car-fi.com .


 


INTEGRATED AMPS:
 

   

 

Pioneer_SA708_Integrated_Amplifier_Web.jpg     Pioneer_SA-708_Integrated_Amplifier_Collage.jpg

NEW LISTING 1/13/14
 (Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
PIONEER STEREO INTEGRATED AMPLIFIER
PIONEER SA-708 / SA708

 
#...0164D
 "
WORLD AC POWER"
  Circa 1978-'80
  MIJ

 For sale
SOLD 1/16/14
SHIPPING TO NEW MEXICO

 
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  Voltage selector corrected for 120VAC.

ü  Left channel driver board re-built, replacing parts as necessary.

ü  Relay cover removed, and contacts burnished.

ü  Bias and DC offset 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.

Great looking brushed aluminum face plate or the original aluminum knobs. Following restoration procedures, the unit was ran continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours.

     
 On our test bench the internal amplifiers of this particular unit, #...0164D, produced 24 volts per channel at 8 ohms for 72 watts per channel and 21.5 volts at 4 ohms for 115 watts per channel via discrete outputs (2x 2SA1075 & 2x 2SC2525)
Idle current draw .3A.
 DC out measured at <11.2mV 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.  Great amp for home or project recording studio use.
 Pioneer SA-708/SA-7800 Integrated Amplifier Features include:
  

- 'DC Power Amp' utilizes 'super linear output transistors' with 'high range switching to reduce distortion (switching noise)
- 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
 
- 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
- 'Stereo / Mono' 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. Also features "spring-clip"  speaker connectors for A&B, 2 Switched and 1 un-switched AC outlets for a maximum load of 300 watts of external gear.
 - True  "
WORLD AC POWER"™ 50 / 60 cycles and 110-240 volt operation
 
 Pioneer SA-708 Original Specifications:
 
 "
Continuous Power output of 65 Watts per channel, min. @ 8 Ohms from 20Hz to 20kHz @ <0.02%THD or 45 Watts per channel, min. @ 4 Ohms from 20Hz to 20kHz @ <0.03%THD."
 
 
  Design type: 2 Channels, Integrated Pre /
  Class AB operation Power Amplifier
  Damping Factor: >35 @ 20-20kHz into 8Ω
  S/N: 100dB for 'non-phono' inputs
  - THD & IMD; 0.02% at full rated power into 8Ω w/ 20-20kHz
  Freq Response: 10Hz-50kHz at full rated power
  Input Sensitivities 'non-phono' inputs: 150mV / 50KΩ via RCA's
   Bass Control;  ±7.5dB @ 100Hz
   Treble Control;  ±7.5dB @ 10kHz
  Subsonic Filter;  -6dB / oct @ 15kHz
 Loudness;  +6dB @ 100Hz & +3dB @ 10kHz w/ vol set at -40dB

 

 Phono Section:

 Phono MM Sensitivity: 2.5mV / 50kHz
 Phono MM Maximum Input Level: 200mV RMS
 Phono THD: 0.03% @ 1kHz
  Freq Response: 20Hz-20kHz
 S/N: 86dB

 
 Again, as stated before, our technician has completely refurb'd this Pioneer SA-708 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 SA-708 has considerably better specs than it's little brother, the SA-608 / SA-6800, especially in the phono section
(check S/N and Freq Response particularly).
Comes with an 'e' copy / pdf download of the original Pioneer SA-708 owners / users manual and service manual if purchaser so desires.
Measures 16.5" wide x 13.25" deep x 6" tall and weighs 22 lbs unpacked. Includes our 90 day limited warranty!
 PIONEER SA-708 INTEGRATED AMP
  Cond. 8.5++

 
(C) K.K.
SOLD 1/16/14
SHIPPING TO NEW MEXICO

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

 

 

 

-
 

 

 


SOLD ITEMS BELOW

 

 


TO SEE OUR ARCHIVE OF SOLD AMPS & PREAMPS CLICK HERE
 


           NEW LISTING 5/4/12
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE
NAD STEREO POWER AMPLIFIER 2150
2-OHMS STABLE!!!
#...6309
   Circa 1982-84
   MIJ

SOLD 8/2/13
SHIPPING TO OKLAHOMA

Our technician has completely gone through and 'Certified' this unit. Unit bench checked / tested. Amp has been cleaned inside and out. Face removed, cleaned and reattached. All functions have been tested and pass with flying colors!
Amp designed using Huge Power Supply Transformer and 'QUAD' filter capacitors
(most amps and receivers only have 2). Power output section features oversized, vertical, 'thin' finned aluminum heat sink for very efficient and silent, passive cooling of HUGE output devices. The 'Speaker Selector' button caps have been changed from NAD 'square' caps to NAD 'round' caps for cosmetic reasons I suppose. 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 4 hours straight and it functioned flawlessly.
   

   While this amp is originally rated at 50 watts with both channels driven, on our test bench, this particular unit's (#...6309) amplifiers produced 24.7 volts at 8 ohms per channel for 76 watts / channel and 20.9 volts at 4 ohms per channel for 109 watts / channel via discrete output transistors (2x Sanken 2SA1215 & 2x 2SC2921. (Idle AC current draw @ .55A. & DC offset out = <3mV on either side
Floor noise measured at L= .1mVAC and R=.1mVAC

   

NAD amps have always been known for understated appearance and performance. I sold NAD as new, when this model was current and while they were never much on looks, they made up for that in performance. Excellent for 2-channel (stereo) audio listening or for use in an A/V system, and it's stable into 2 Ohms!!! Lots of punch and headroom.
   Features:
   

- 2-Ohms Stable
- 2- Channel stereo operation
- Selector for one pair of 8 Ohms speakers.
   - A or B speaker selector
   - Built-in Protection circuit
   - LED Status indicators for Power, Protection & Soft Clipping
   - Front-mounted 1/4" stereo headphone jack
   - RCA input jacks
   - Very efficient, vertically finned, internal heat sink
   - Oversize power supply transformer and outputs
   - Dual Rear-mounted AC convenience outlets (1 switched and 1 un-switched for a total capacity of 250 watts)

   
 Original Specs:
 "50 Watts per channel minimum RMS, both channels driven @ 8ohms, 20-20k, with no more than 0.03% THD"
Dynamic Headroom Power 8Ω: 1.8dB / 90wpc
   Design type: 2 Channels, AB operation
 Slew Rate @ 1kHz / 8Ω: >20V/
μsec
 Damping Factor @ 50Hz / 8Ω: >100
 Transient Overload Recovery Time: >1V/
μsec

  Rated RMS Output: 50 watts per channel, min. RMS, @ 8
Ω, both channels driven, from 20Hz to 20kHz. (60 watts with switch set to '≥8 Ohms')
Clipping Music Power; 57wpc @ 8Ω (68 watts with switch set to
'≥8 Ohms'), 80wpc @ 4Ω, 90wpc @ 2Ω
'Dynamic'
Power; 90wpc @ 8Ω (100 watts with switch set to
'≥8 Ohms'), 150wpc @ 4Ω, 180wpc @ 2Ω
 

THD; 0.03% @ beyond rated power / 8Ω w/ 20-20kHz
IMD; 0.03% @ rated power /
   Power Bandwidth: 10Hz-35kHz @ 0.03% THD @ 8Ω
 
This amp features a selectable 'output impedance' switch when using with only ONE pair of 8-Ohm speakers. This is a very important feature that most amps do not have. If you have only one pair of speakers, it allows the amp to supply all of it's 'potential' into that one set. The total power potential on most amps can only be realized with either TWO pair of 8 Ohms speakers, or by using one pair of 4 Ohm speakers. Again, as stated before, our technician has completely refurb'd this NAD 2150, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'.  With the exception of a few minor 'dings' along the edge of the face, the unit looks decent (see above photos). Unit looks, works and sounds great! Again, NAD amps are known for incredible punch, headroom, and musicality. I sold many NAD products when new, and don't ever remember a complaint from any one who purchased one. Only compliments!
Unit
measures 16.5" wide x 12.25" deep x 3.8" high and weighs 20 lbs unpacked. Includes our standard 90 day limited warranty.
NAD 2150 2-CHANNEL STEREO POWER AMP
   Cond. 8.5
(C)
M.R.

SOLD 8/2/13
SHIPPING TO OKLAHOMA

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

 

 

 

   


 

        NEW LISTING 4/17/13
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE LUXMAN INTEGRATED POWER AMPLIFIER
LUXMAN L-80V  L80V
STEREO INTEGRATED AMPLIFIER
#...1924
Circa 1976-80
MIJ

for sale

SOLD 7/10/13
SHIPPING TO WISCONSIN

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  Output Transistors removed and individually tested for leakage and proper specs

ü  Silicone heat sink compound was replaced on all output devices upon replacements.

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

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

ü  Power/Dial indicator lamp replaced.

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 brushed aluminum face plate or the original tinted aluminum knobs shows no wear 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, #...1924, produced peak power of 23 volts @ 8Ω per channel for 66 watts / channel and 20 volts @ 4Ω per channel 100 watts / channel via discrete TO-3 metal case output devices at 1khz. (2X 2SC1116A & 2X 2SA747A). AC Idle current at .2A. DC offset adjusted to a SUPER LOW <0.1 mV L&R. Floor noise <0.6 mVAC.
____________________________

The Luxman L-80V was the upgrade to the popular L-80 and offers increased power and cleaner distortion figures.  The Luxman integrated amplifiers were always very impressive looking units and the L-80V is no exception. The Luxman L-80V is a Fully Complementary Symmetry Direct Coupled class AB amplifier and doesn't use 'coupling caps' on it's outputs. This results in a number of HIGH QUALITY sonic benefits; reduces ALL types of distortion (without more negative feedback loop circuitry), wider bandwidth (15-50kHz), improves transient response (makes for much more 'solid' hitting and 'tighter' notes in music program) and eliminated 'colorization' (smearing) in your music.

From the 1977 “The Complete Buyers Guide To Stereo / Hi-Fi Equipment”, “Luxman is well known for their ultra-sophisticated separates, some of which are counted among the finest equipment available.  The “V” series of components exhibit the same attention to detail that the costlier models do and the L-80V amp is a superb performer.  While not extremely powerful, it offers low distortion and an array of useful features and very good construction.  It is built to last a lifetime and should satisfy even the most discriminating audiophile.”
 
____________________________

LUXMAN L-80V Features include:

- 'Fully Complementary Symmetry Direct Coupled power amp section
- Real Metal Cased, TO-3 output transistors for lot's of punch and tone!!!!
- Rear located, Vertically-Finned heat-sink keep heat out of unit and away from internal components (all gear should be designed with this feature)
- Separate Bass and Treble controls featuring high quality ‘de-tented’ pots
- Selectable ‘Dual-Position’, ‘Turn-Over’ frequencies for both Bass and Treble
- Separate ‘Tone Defeat’ selectors, 1 each for Bass and Treble for purest signal path and most un-adulterated sound
- Independent speaker selector switches for A, B, A+B, Off
- Dual Phono / Turntable input with Built-In Phono Pre-Amp
  - Dual 'TRUE' tape 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® / 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 monitor 1 features a DIN I/O in addition to the RCA I/O's
- Bi-Directional Tape Dubbing
-Dual Aux inputs enabling greater input flexibility
(may also be used for Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc.) input
- Loudness features In, Defeat and Low Only Switch (Low Freq only: 150 Hz)
- Stereo / Mono Selector for ‘Stereo’, ‘Mono’ or ‘Reverse’ (reverse is very handy for trouble-shooting speakers)
- Selectable Hi filter for reducing tape hiss / electronic hiss & noise and record static ( 7KHz or 12 KHz)
- Selectable Subsonic Filter to eliminate excess rumble from sources such as turntables (70 Hz, or Subsonic)
- Front mounted, ¼”, Stereo headphone jack
 - Dual AC convenience outlets on rear panel with Switched (100 Watt) & Un-switched (200 Watt) for a total capacity of 300 watts of accessories

Original Luxman L-80V Specifications:

AMP SPECIFICATIONS:
Power output: 50wpc min RMS @ 8 Ohms & no more than 0.05% THD @ 10-50kHz
THD; <0.05% @ full rated power
IHF IMD; 0.05% @ full rated power & 8 Ohms
Freq Response of power amp section: 10Hz to 50kHz
Damping factor; 35 @ 8Ω / 1kHz
Signal to noise ratio: 63dB (Phono), 78dB (line)
Input sensitivity:
2.5mV (MM), 60mV (DIN), 120mV (line)
Bass Turnover Frequency:
300 Hz
Treble Turnover Frequency:
3 KHz
Loudness Control;
Low Boost/Loudness Switch (Low Freq only: 150 Hz)

PHONO SECTION SPECS;
Freq Response;
20Hz-20kHz w/ RIAA deviation; ±0.3dB
S/N; >63dB
Input Sensitivity; 2.5mV @ 50kΩ


Again, we have done the previously stated refurbishment / restoration work on this unit to insure it's performance, and it gets our full 'Certification'. All functions tested
for perfect operation. As we stated earlier, this unit looks NEAR NEW! Performs and sounds great! Really COOL looking with its vintage large champagne tinted knobs and selector switches.  While we don't have a copy of the specific users manual for the Luxman L-80V, we will include an 'e' copy, PDF of it's little brother, the Luxman L-80 receiver owners manual. Measures 22.25" wide x 6.5" tall x 17" deep and weighs an impressive 23 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8.5+++

LUXMAN L-80V INTEGRATED AMPLIFIER

(C) M.R.
SOLD 7/10/13
SHIPPING TO WISCONSIN



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

 

 

 

        NEW LISTING 4/17/13
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)   warranty
  KENWOOD INTEGRATED STEREO AMPLIFIER
KA-6150 / KA6150
"WORLD AC POWER" ™
  Circa 1978-'82
M.I.J.

SOLD 7/31/13
SHIPPING TO ILLINOIS

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  Extensive cleaning of unit internally as it had a ‘haze’ on its finish. We were able to rectify ‘most’ of it. The unit still exhibits a slight ‘haze’ to its panels, but nothing too distracting.

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  Replaced damaged AC power cord.

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

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

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

ü  Damaged speaker terminals / posts were replaced.

ü  Meter lamp was replaced and aqua tinted.

ü  Meter enclosures cleaned and resealed.

ü  All functions tested for perfect operation.

ü  Following above procedures, unit was cosmetically detailed inside and out. Only cosmetic issues with this unit are; the above mentioned ‘hazing’, minor scuffing on the bonnet / cover.

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, produced peak power of 24 volts per channel at 8 ohms for 72 watts per channel and 19 volts at 4 ohms for 90 watts per channel via discrete, TO-3, metal cased output devices (Sanken 2x 2SA980 & 2x 2SC2260) AC Idle current at .250A, & floor noise <1.2mVAC and DC offset adjusted to a SUPER LOW <7mV L&R.
 
____________________________

Kenwood KA-6150 Features Include
  - A-B-A+B-& off speaker selector
  - Separate Bass and Treble utilizing super quality de-tented pots
- - Tone Defeat selector for 'purest' signal path if desired
  - Super quality de-tented Volume control pot
  - Dual tape deck monitors w/ Tape 'B' featuring both RCA and DIN I/O's
   
  (Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iTouch® / 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 A to B Dubbing Capability with both Source or B Monitoring
 - 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® / SIRUS® etc.)
    - Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc. inputs)
- Loudness control. "Loudness" functions to boost Bass 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
- Large analog power level meters with switch selectable power range (3 / 80 watt)
- Front mounted 1/4" stereo headphone jack

  - Triple AC convenience outlets on rear panel with 2 switched (100 watt combined)  and 1 un-switched (300 watt) for a total capacity of 400 watts of accessories. 
- True
"WORLD AC POWER"
110V, 120V, 220V & 240V AC current

Original Kenwood KA-6150 Specifications:

POWER / PRE AMP SPECIFICATIONS:

Power output: 50wpc min RMS @ 8 Ohms & no more than 0.03% THD @ 20-20kHz
50wpc min RMS @ 8 Ohms both channels driven & no more than 0.03% THD @ 1kHz
70wpc min RMS @ 4 Ohms both channels driven & no more than 0.03% THD @ 1kHz
Dynamic Power Output: 230 watts @ 4 ohms
Power Bandwidth: 5-30,000Hz
THD:
no more than 0.03% THD @ 20-20kHz at full rated power
IHF IMD: 0.02% @ full rated power & 8 Ohms
Freq Response of power amp section: 10 Hz to 50,000 Hz +0 dB, -1 dB
Damping Factor: 50 @ 8 ohms
Speaker Impedance: 4 ohms to 16 ohms

PRE-AMP SECTION:
    Signal / Noise Ratio (IHF, A):  106dB @ Tuner, Aux, Tape A/B inputs
 Input Sensitivity AUX / Tape @ RCA's: 150mV @ 50kΩ (Tape DIN = 30mV)  Freq Response of 'Tape, AUX, Tuner': 10 Hz to 50,000 Hz +0 dB, -1 dB
    Bass Control:  ±7.5dB @ 100hz
    Treble Control:  ±7.5dB @ 10khz
    Subsonic Filter: 18Hz, 6 dB/Oct
    Loudness Control: +8dB @ 100Hz (-30dB Vol Level)
Tape Output Level / Impedance: RCA 150 mV / 450 ohm, DIN 30 mV / 80K ohm

PHONO SECTION SPECS:
   Freq Response:
RIAA Standard Curve & ±0.3dB
Signal / Noise Ratio (IHF, A):  86dB @ 2.5 mV, 92 dB @ 5.0 mV, 98 dB @ 0 mV
Input Sensitivity: 2.5 mV @ 50kΩ
   Max Input / Overload limit:  230mV @ 1k w/ 0.03% THD

Again, we have done the previously stated refurbishment / restoration work (~12+ hours) on this unit to insure its performance, and it gets our full 'Certification'. All functions tested for perfect operation. Other than the previously mentioned slight ‘haze’ and scuffing / wear, this unit is in great cosmetic condition! Performs and sounds great! Really COOL looking when lit up at night or in a darkened room with tinted power meter lights! This is a very ‘musical’ sounding amp with lot’s of punch! Measures 17" wide x 6" tall x 14.5" deep and weighs an impressive 25 lbs unpacked. Includes our standard 90 day limited warranty.
Cond. 8
Kenwood KA-6150 Integrated Amplifier

SOLD 7/31/13
SHIPPING TO ILLINOIS



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

 

 

 



 

NEW LISTING 4/26/13
(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

#...8443

Circa late 1980's
MIJ

SOLD 5/23/13
SHIPPING TO CALIFORNIA

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 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  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, #...8443, produced peak power of 28 volts @ 8Ω per channel for 196 watts / channel and 41 volts @ 4Ω per channel 210 watts / channel via 8 discrete output devices at 1khz. (4X 2SC3182 & 4X 2SA1265). AC Idle current at .35A. DC offset adjusted to <11 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. 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.

 
____________________________

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

§  Infinitely variable ‘Turn-Over’ frequencies for both Bass and Treble

§  ‘Parametric 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

§  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 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, this unit looks NEAR NEW! 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. 9
FISHER CA-276 INTEGRATED AMPLIFIER
(C) R.R.

SOLD 5/23/13
SHIPPING TO CALIFORNIA


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

 

 

 

     

 

NEW LISTING 12/27/12
(Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE
DENON STEREO INTEGRATED AMPLIFIER
DENON PMA-757
STEREO INTEGRATED AMP

#...0026
Circa 19
84-86
MIJ

SOLD 1/1/13
SHIPPED TO MISSOURI

Our technician has completely gone through and 'Certified' this unit. Following ext / int visual inspection entire unit was cleaned and out including all contacts, switches and controls. Switches now clean sounding and performing solidly. Silicone heat sink pads installed. All nine (9) 'Function Indicator' / Spkr lamps replaced regardless of current condition. Output section bias / DC offset adjusted to spec conditions.
All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following electronic refurb, entire unit was cosmetically detailed. Great looking brushed aluminum face plate or the original aluminum knobs. 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.

    
While this amp was originally rated at 80 wpc, on our test bench the internal amplifiers of this particular unit, #...0026, produced 29 volts per channel at 8 ohms for 105 watts per channel and 26.6 volts at 4 ohms for 176 watts per channel via discrete, TO-3 outputs (2x 2SB489 & 2x 2SD1110)
 Overall Idle current draw measured @ 350mA. DC offset / out adjusted to and measured at <6mV on either side. Bias set to 10mV.
Very quiet with Floor noise measured at <0.1mVAC.

   
____________________________
   
Great performing and VERY handsome looking Denon PMA-757 Integrated Amplifier. Great unit to provide the heart of a medium to mid-large sized Hi-Fi system. Has some pretty impressive design appointments such as, 'High Speed Dual Super Non-Negative Feedback Circuit', 'DC' output design, Massive power supply and great output protection. From the original broch;
'
"High Speed Dual Super Non-Negative Feedback Circuit"- Dual super  Non-NFB circuit clearly eliminates static distortion generated at output transistors. This technique reduces static distortion to essentially zero. The signal itself is not fed back to the input, and the dynamic characteristics of the amplifier are greatly improved. High slew rates of +200V/US have been achieved." and,
"Complete Elimination of Capacitors from Signal Path -
Direct 'DC' servo circuitry completely eliminates large-capacity coupling capacitors. These capacitors badly degrade signal quality from signal path. As a result of the new circuitry, the music source can be clearly and accurately reproduced", and
'A Heavy Duty Power Supply -
The PMA-757's high capability, stable power supply section consists of a high performance, oversized power transformer and a large capacity block capacitor to achieve superb regulation and S/N ratio" and
 "High-Speed Protection Circuit for Safety
- If an unexpected problem occurs, such as speaker terminal short or generation for direct current in the output, the protection circuit functions simultaneously. This prevents speaker and amplifier damage. A muting circuit is also provided in order to eliminate noise generated a power "on-Off' (DC surge protection)
".
 
This unit was a pleasure to 'test drive' for me, once the tech finished it. Very precision feel both mechanically and sonically. Unit looks, works and sounds great!

Denon PMA-757 Features include:

  

- 'DC' (Direct Coupled) output eliminates 'coupling capacitors' commonly found on most amps. DC results in cleaner, clearer, more accurate sonic output.

- +3.0 dB Dynamic Headroom!

- Speaker A, B, A+B, Off selector

- Separate Bass and Treble controls

- "Tone Defeat" for Bass and Treble function allows Tone control circuitry to be bypassed for purest signal path

- AUX / VIDEO 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.)

- DAD 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.)
   - 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® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)

   - 'Bi-Directional' Tape Dubbing Capability

- Phono / Turntable input with selector for either MM (Moving Magnet cartridge) or MC (Moving Coil Cartridge) (this feature alone could be worth hundreds of $$ if you are going to utilize a Moving Coil turntable cartridge)

 - Record Out selector with bi-directional tape dubbing controls. (Separate "Record Out" allows recording from one source while you listen to another)

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


 - Subsonic filter @ 20Hz & 6dB / OCT for reducing turntable rumble

- Global Stereo / Mono selector w/ 'Reversal' position (great for troubleshooting speakers or system)

- 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

- Triple AC Convenience outlets (2 switched and 1 un-switched) with a total capacity of 350 watts

   
Original DENON PMA-757 Specifications:

  
 
  
 Design type: 2 Channel, discrete output, Class A/B, Direct Coupled output
POWER AMP SECTION:
  Freq Response of power amp section;
 5Hz-80kHz

 Signal / Noise at 'non-phono' inputs; 110dB
 Cont rated Power:
 2x 100 watts @ 8 Ohms / 20Hz-20kHz

 2x 120 watts @ 4 Ohms / 20Hz-20kHz
2x 150 watts @ 4 Ohms / 1kHz
 
 Dynamic rated Power: 3dB

THD; 0.003% @ -3dB of rated output or
0.02% @ 100 Watts & 8 Ohms from 20-20kHz

PRE-AMP SECTION:
 
   Signal / Noise;  110dB @ Tuner / AUX / DAD / Tape 'shorted'
 
   Input Sensitivity Tuner / Tape @ RCA's; 150mV @ 47
THD; 0.002% at rated ouput
 
   Bass Control;  ±8dB @ 100hz
 
   Treble Control;  ±8dB @ 10khz
Subsonic
Filter; 20Hz & 8dB/Oct
 
   Loudness Control; +7dB @ 100Hz & +6dB @ 10kHz(-40dB VOL)

PHONO SECTION SPECS;
   Freq Response;
30-15kHz ±0.3dB
 
  S/N MM / MC ; >88dB!!! / 72dB, IHF-A
    Input Sensitivity; 2.5mV @ 47MM & 200
μV @ 100kΩ MC

 

Again, as stated before, our technician has completely refurb'd this Denon PMA-757 Stereo Integrated amplifier, cleaning and testing all and it gets our full 'Certification'. All functions test perfectly. Great control / pre-amplifier for just about any stereo system / power amp. This is a fabulous amp. Sonically superb following our techs work. Very musical....Check that 'Slew Rate' above!!! Lots of solid power / punch. Unit looks and sounds great! Includes a pdf 'e' copy of the Denon PMA-757 Owners / Users Manual. Measures 17" wide x 15.5" deep x 5.5" tall and weighs 26 lbs unpacked. Includes our 90 day limited warranty.
Denon PMA-757 Stereo Integrated amplifier
Condition
9
SOLD 1/1/13
SHIPPED TO MISSOURI

(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 10/13/12 
(Click on above thumbnails to enlarge photos)

CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED CROWN STEREO PRE-AMPLIFIER
CROWN PSL-2 "STRAIGHT LINE"
#...2351
MADE IN THE USA!
Circa 1981-92

SOLD 1/21/13
SHIPPED TO NEW YORK

Our technician has completely gone through and 'Certified' this unit. Everything was completely tested and benched. Unit looks great! All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! Checked with O-Scope. No power supply hum of any kind. It's dead silent!

Near 'New' condition, Crown PSL-2' "Straight Line" Pre-Amp with performance to match. Straight-Line” signal path engineering results in very low distortion. This is a VERY WELL BUILT unit made in the USA. Internal wiring / construction is reminiscent of super high-end "boutique" built audio.
Features include:
 
- Active and De-featable, 2-Band EQ / Tone Controls super quality, de-tented potentiometers
- EQ Bypass switch for purest audio signal path
  - Built-in Low Filter to eliminate excess rumble from sources such as turntables
- Stereo Mode selector for Normal, Reverse, Left / Right or Mono signal input
- L / R Balance

- 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® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)

- Phono / turntable input w/ built-in phono pre-amp

- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod® / iPad® / iPhone® / iPod® / iTouch® / iGadget / eReader / MP3 / XM® / SIRUS® etc.)
- 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.)
- CD 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.)
- 'Processor Loop' for connecting 'Signal Processors' such as EQ's, Dynamic Range Expanders, Reverbs, Compressors, etc., without 'chewing up' a Tape Monitor
-  1/4" stereo headphone jack
- Dual RCA output pairs for feeding two separate power amps, or systems with output level 1 having a rear mounted variable "Limiter" to put a ceiling on the output to protect speakers from excessive level input to the power amp
- 6 AC convenience outlets on rear panel (5 switched for a max load and 1 un-switched for a max of 1200 watts)


Original Crown PSL-2 Pre-Amp Specs:
  

  Design type: 2 Channels, Analog operation
Frequency Response: 2-250kHz
±0.2dB
Output Impedance: 600 ohms.
Output Level: Main and phono outputs: 2.5 volts

S/N @ all 'non-phono' inputs: 103dB
 THD; 0.009% at full rated power

 IHF IM DISTORTION; 0.0025%
Input Sensitivity: 250mV applied to Tape, Tuner, CD or Aux input yields full rated output at full gain of 20 dB.
Low Filter: 18 dB per octave slope, down 32 dB at 10 Hz.
DC Muting: Seven second turn-on delay during which the outputs are shorted to prevent turn-on transients from reaching the speakers.
Phono Gain: Adjustable 30 to 50 dB (33 to 330 mV for rated output).
 
S/N on Phono MM w/ 5mv signal: 93dB


 Again, as stated before,
our technician has completely refurb'd this Crown PSL-2, "Straight Line", stereo Pre-Amp, cleaning and testing all and it gets our full 'Certification'.  All original knobs intact and no bent control shafts. Face plate in virtually NEW condition as are all the original knobs. Unit looks beautiful and sounds great. Includes a pdf 'e' copy of the Crown PSL-2 brochure / specification sheet. Measures standard 19" rack width wide x 11.5" deep x 1.75" (1 rack space) tall and weighs 11 lbs unpacked. Includes our standard 90 day limited warranty.
CROWN PSL-2 'Straight Line' STEREO PRE-AMPLIFIER
Cond. 8.5++++

(C) M.R.
SOLD 1/21/13
SHIPPED TO NEW YORK

 

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


 

 





         NEW ADDITION 11/2/11
 (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
HARMAN KARDON HK
CITATION ELEVEN / II
STEREO PRE-AMPLIFIER
MADE IN THE USA!
Circa 1973-76
for sale

SOLD 4/5/13
SHIPPED TO MISSOURI

Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all contacts, switches and rotary pots (the graphic faders are already silent, and still have their 'silky smooth' silicon lube intact). New 'foam gasket' cut for graphic controls. Real Wood veneer case had a fresh coat of lemon oil. Unit looks great! All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! Checked with O-Scope. No power supply hum of any kind. It's dead silent!
On our test bench this particular unit, #...0273 drew .05A at idle. DC measured at 00.2 to -00.4 mVAC on left and 00.3 to -00.6 mVAC on the right with outputs 'un-attenuated'.
Preamp amplified incoming signal or .780V to 1.2V. Very quiet as floor noise measured at 00.0 mVAC on both sides outputs 'un-attenuated'. Crosstalk was undetectable with any input!


Very 'handsome' Harman-Kardon, 'Citation-Eleven' Pre-Amp with performance to match. Brushed aluminum face with matching "milled" look knobs. This is a VERY WELL BUILT unit made in the USA. Internal wiring / construction is reminiscent of super high-end "boutique" built audio.
Features include:
 
- 5-band Graphic Eq / Tone controls (Bass centered @ 60Hz, Mid Bass centered @ 320Hz, Mids centered @ 1kHz, Mid-highs centered @ 5kHz, and Highs centered @ 12Khz.
- EQ Bypass switch for purest audio signal path
  - Built-in Subsonic Filter to eliminate excess rumble from sources such as turntables
 - Hi filter for reducing tape hiss / electronic hiss & noise and record static
- Stereo Mode selector for Normal, Reverse, Left / Right or Mono signal input -30 dB
- L / R Balance
- Speaker Selector (when using matching / dedicated HK power amps)
- Dual Tape 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® / SIRUS® CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Dual Phono / turntable inputs
- 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.)
- Triple AUX inputs (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.)
- Dual Front-mounted 1/4" stereo headphone jacks
- Dual ground lugs
- Dual RCA output pairs for feeding two separate power amps, or systems with output level 1 having a rear mounted variable "Limiter" to put a ceiling on the output to protect speakers from excessive level input to the power amp
- 4 AC convenience outlets on rear panel (3 switched for a max load of 600 watts and 1 un-switched for a max of 300 watts)
- 5-6 Pin dedicated power amp input if using matching HK amp for using internal speaker selector


Original Specs:
  

  Design type: 2 Channels, Analog operation
Frequency Response: 2-250kHz
±0.2dB
Maximum Output Level: 6V
 THD; 0.05% at full rated power

 IHF IM DISTORTION; 0.05%
Phono MM Sensitivity: 2.5mv
Phono MM Maximum Input Level: 200mv
 
S/N on Phono MM w/ 5mv signal: 72dB
High Level input impedance / sensitivity (tuner, Aux, Tape) : 20k Ohms / 0.15V


 Again, as stated before,
our technician has completely refurb'd this HARMAN KARDON "CITATION ELEVEN", stereo Pre-Amp, cleaning and testing all and it gets our full 'Certification'.  All original knobs intact and no bent control shafts. Face plate in virtually NEW condition as are all the original knobs. Unit looks beautiful and sounds great. Measures 17" wide x 13" deep x 6.25" tall and weighs 20 lbs unpacked. Includes our standard 90 day limited warranty.
HARMAN KARDON HK CITATION ELEVEN / II STEREO PRE-AMPLIFIER
Cond. 8.5+

in originally optional wood case!

SOLD 4/5/13
SHIPPED TO MISSOURI

 

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


 

 



    


           NEW ADDITION 3/27/12
 (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED
KENWOOD POWER AMPLIFIER KM-209 KM209
(SAME SPECS AS KM-205) 
#...4815
   Circa 1985-86
   MIJ

SOLD 2/1/13
SHIPPED TO CALIFORNIA

Our technician has completely gone through and 'Certified' this unit. Unit bench checked / tested. Amp has been cleaned inside and out. Face removed, meter illumination lens removed, cleaned and reattached. All new panel illumination lamps replaced with new. All functions have been tested and pass with flying colors!
Amp designed using Huge Power Supply Transformer and oversized, vertical finned heat sink for very efficient and silent, passive cooling of output devices. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous high volume for 4 hours straight and it functioned flawlessly.
   

   While this amp is originally rated at 150 watts with both channels driven, on our test bench, this particular unit's (#...4815) amplifiers produced 38.5 volts at 8 ohms per channel for 185 watts / channel and 30 volts at 4 ohms per channel for 225 watts / channel via discrete output transistors (2x 2SA1216 & 2x 2SC2922. (Idle AC current draw @ .3A.
DC offset out L= 5.5mV & R= 6.4mV.
Floor noise measured at L= 00.0mVAC and R=00.1mVAC

   

   Great, later model power amp by Kenwood. Model KM-209. HUGE power output! Excellent for 2-channel (stereo) audio listening or for use in an A/V system. Lots of punch and headroom.
   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)

   
 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 @ 1kHz / 8Ω: 35
  Rated RMS Output: 150 watts per channel, min. RMS, @ 8
Ω, both channels driven, from 20Hz to 20kHz.
Music Power 314 watts per channel
THD; 0.015% @ half rated power / 8Ω w/ 20-20kHz
0.001% @ half rated power / 8Ω w/ 1kHz
IMD; 0.002% @ rated power /
   Power Bandwidth: 10Hz-50kHz @ 0.03% THD @ 8Ω
   Potential Frequency Response: 5Hz-200kHz
Damping Factor; >35 @50Hz / 8 ohms
Signal / Noise; 120dB A weighted
 
    
 Again, as stated before, our technician has completely refurb'd this Kenwood KM-209, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'.  With the exception of the afore mentioned, upper, left corner 'ding', and smaller, right corner ding (see above photos), the unit is in beautiful cosmetic condition. 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-209
   Cond. 8.5

SOLD 2/1/13
SHIPPED TO CALIFORNIA

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

 

 

 

 



      

                  YAMAHA C-6 / M-4 PAIR

           NEW LISTING 5/4/12
          NEW LISTING 9/28/12
 
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CheckMarkSmall_web.jpg (792 bytes)  warranty
  YAMAHA
STEREO PRE- AMPLIFIER

YAMAHA C-6 / C6
#...3428
ANALOG PREAMP / CONTROL AMP
with FULLY PARAMETRIC EQUALIZER!
Circa 1979-82
  
"WORLD AC POWER"
 MIJ

SOLD 2/3/13
SHIPPED TO COLORADO

  
Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including cleaning and re-flowing solder joints as necessary including ALL RCA I/O jacks. New internal lamps installed on switches. Unit looks great! All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! Checked with O-Scope. No power supply hum of any kind. It's dead silent!
  
 
 Yamaha C-6 Analog, Stereo Pre-amp / control center. This is 'one quiet' pre-amp. 'Cross pollination' from one input to another is also incredibly low. We were astounded by it's performance in that respect
  
Features include:
  

  -
2-Band FULLY PARAMETRIC EQ / Tone Controls.
- Tone is not only 'De-featable', but assignable to either the 'Pre-Out' or either Tape Record outputs

  - Subsonic filter at 15Hz for reducing turntable rumble / feedback
- Hi filter for reducing tape hiss / electronic hiss & noise and record static
  - Dual tape 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® / 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)
(note; tape monitors combined with source selection, thus any external signal processors are relegated to the Pre's "Output" to Power Amp "Input" signal chain)


  - AUX Input (can be used for CD / DVD (used for 'Audio Only' as an input to the pre-amp) / DAT / MP3 / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc. etc.)

  - Tuner input (can be used for Video / CD / DVD / VCR / DAT / MP3 / Video / iPod® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS® etc. etc.)
  - Phono / Turntable input
- Phono / Turntable input with selector for either MM (Moving Magnet cartridge) or MC (Moving Coil Cartridge) (this feature alone could be worth hundreds of $$ if you are going to utilize a Moving Coil turntable cartridge)
 - Record Out selector with bi-directional tape dubbing controls. (Separate "Record Out" allows recording from one source while you listen to another)
- Global Stereo / Mono selector
- 24 Karat Gold plated I/O jacks on Phono Inputs.
- Instant -20 dB Audio Level Muting
  - Triple AC outlets ( 2 switched, 1 un-switched) for a total capacity of 400 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.
  
Yamaha C-6 Preamp Original Specs:
  

  Design type: 2-Channels, Analog operation
Frequency Response: 20-20kHz +0 / -0.2dB on Phono MM & 10-100kHz +0 / -0.5dB on all 'Non-Phono'
Maximum Output Level @ 'Pre': 13V @ 0.01% THD
 THD on all inputs except 'Phono'; 0.01% at full rated power 10V
 
S/N @ all 'non-phono' inputs: 102dB
 Channel Separation: 70dB @ 1kHz & Vol @ -30dB
Residual Noise: 7.75μV

Input Sensitivity AUX / Tape; 150mV @ 47
Max Input AUX / Tape; 1V @ 1kHz
Maximum Output Level 'Rec Out': 150mV @ 220 Ohms
  Bass Control;  ±12dB Selectable Center from 31.5Hz to 640Hz
  Treble Control;  ±12dB Selectable Center from 640Hz to 12.5kHz
Bandwidth;  3.0 Oct to 0.3 (1/3) Oct
  Low Filter;  15Hz @ 12dB Oct
  High Filter;  10kHz @ 12dB Oct

Headphone Maximum Output Level: 12mW @ 8 Ohms

Phono Section:
Frequency Response: 20-20kHz +0 / -0.2dB on Phono MM
Phono MM Sensitivity: 2.5mV @
47
Phono MC Sensitivity: 100μV @
50Ω
Phono MM Maximum Input Level: 240mV @
1
Phono MC Maximum Input Level: 9mV @ 1
THD on 'MM'; 0.005% at -30dB
THD on 'MC'; 0.02% at -30dB
 
S/N on Phono MM w/ 5mv signal: 97dB
 
S/N on Phono MC w/ 5mv signal: 88dB
 
Channel Separation: 70dB @ 1kHz & Vol @ -30dB
 
Phono Capacitance:
220pF

  Again, as stated before, our technician has completely refurb'd this Yamaha C-6, stereo Pre-Amp, cleaning and testing all and it gets our full 'Certification'. This Yamaha C-6 is a very high quality control / pre-amplifier for most any system especially those requiring EQ / Tone Control section. Yamaha has always been known for building pre-amps that can hold their own with units 3-5 times the cost. Will work with most any power amplifier, tube or solid state. After bench work the unit looks, performs and sounds great! Comes with a pdf / 'e' copy of the Yamaha C-6 owners / users manual. Unit measures 17.25" wide x 4.5" tall x 13.5" deep and weighs 14 lbs unpacked. Includes our standard 90 day limited  warranty.
YAMAHA C-6 PRE-AMPLIFIER
  Condition
8.5
(C) M.R.
SOLD 2/3/13
SHIPPED TO COLORADO

 

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

 

 

 

    

 


          NEW ADDITION 3/27/12

 
 (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED  
KENWOOD STEREO PRE AMPLIFIER KC-209 KC209

 / 7-BAND GRAPHIC EQ 

 Circa early-mid '90's

SOLD 3/4/13
SHIPPED TO FLORIDA

Our technician has completely gone through and 'Certified' this unit. Everything was cleaned inside and out including all contacts, switches and controls. Unit looks like NEW! All functions tested for perfect operation. All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Also, check the specs on this pre-amp against other Kenwood models.
 
 Versatile, and modern Kenwood KC-209 Pre-amp / Graphic EQ / control center. 
 Features include:
 

 
 - Super quality control amplifier
 - 7-Band, Digitally controlled, Graphic EQ w/ 5 memory presets (use 'Call' button to toggle thru them)
 
- 7 frequency centers are as follows: 60Hz - 150Hz - 400Hz - 1kHz - 2.4kHz - 6kHz & 15kHz with ±12 dB (most do only 10 dB)

 - "EQ Record" function allows EQ curve to be imprinted to tape / CD / MP3 recording

 - Full Fluorescent readout for unit status, including 7 band Spectrum Analyzer

 - Tuner Input
(may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)
  - Phono / Turntable input 

 - CD Input
(may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)

 - "CD Direct" allows purest tone of CD through electronics. Also allows you to listen to your CD's while you record other sources to tape, etc.

 - 2 Video / AUX Inputs
(may also be used for Video / CD / DVD /DAT / VCR / MP3 / iPod® / iPad® / iPhone® / iTouch® / iGadget / MP3 / XM® / SIRUS®  etc.)

   - Dual Tape 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® / 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 2 can also serve as a Signal Processor / Surround Sound processor access point / loop)

 - Loudness selector (+8dB @ 100Hz (@-30dB volume level)
 - Dual switched AC convenience outlets on rear panel with  a capacity of 680 watts of accessories
 - Kenwood "XS" System Control jacks for use with other compatible Kenwood "XS" gear
 - Remote Wireless capable with either a universal type remote or Kenwood's RC-70 (remote control not included)
 
 
Specs:
  
  Design type: 2 Channels
 Input Sensitivities: Phono - 2.5mV / 47KΩ
 All other inputs = 150mV / 33KΩ
 S/N: 79dB for Phono w/ 2.5mV or 85 dB w/ 5.0 mV input and 103dB for all other inputs
 Phono Max input level: 130mV, THD 0.03% @ 1kHz
 Phono Frequency Response: 20-20kHz RIAA Standard Curve ±3dB
  Line Input Frequency Response: 10-70kHz, -3dB
 Output: Tape Rec; 150mV/ 330Ω
 Pre Out; 1000mV/ 330Ω
 THD: 0.004% at full rated output w/ 20-20kHz / 0.003% @ 1kHz
 Loudness: +8dB @ 100Hz (@-30dB volume level)

 
Our
technician has completely refurb'd this Kenwood KC-209, stereo Pre-Amp, cleaning and testing all and it gets our full 'Certification'. Great control / pre-amplifier for just about any stereo system / power amp. Unit looks NEW and sounds great! Unit measures 16.5" wide x 3.25" tall x 11" deep and weighs 7 lbs unpacked. Includes our standard 90 day limited warranty.
 KENWOOD KC-209 Stereo Preamplifier
 Cond. 9.5

SOLD 3/4/13
SHIPPED TO FLORIDA

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

 



           NEW LISTING 5/4/12
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
PRE-OWNED
CROWN
PS-200
PROFESSIONAL
STEREO POWER AMPLIFIER
CLASS-A / CLASS A-B
#...7317
MADE IN THE USA!

SOLD 2-20-13
SHIPPED TO SOUTH CAROLINA

Our technician has completely gone through and 'Certified' this unit. Unit bench checked / tested. Amp has been cleaned inside and out. Attenuators are 'sealed' for your protection and never need cleaning! All functions have been tested and pass with flying colors! Amp designed using Huge, Power Supply Transformer and Massive, very efficient, externally located, vertically oriented heat sinks, for sufficient cooling. This amplifier is in both great electronic and physical shape. Looks NEAR 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 4 hours straight and it functioned flawlessly.

I have owned and sold many Crown power-amps and they are famous for a good reason. Very quiet, solid, reliable and REAL power.  

  
On our test bench, this particular Crown PS-200 power amplifier, #...7317, unit's amplifiers produced 28.4 volts at 8 Ohms per channel for 100 continuous watts, and 27.1 volts @ 4 Ohms for 183 watts / channel discrete TO-3, output transistors. 

Features:

- Ultra-low-noise/ low-distortion design
- Stereo or Bridge Mono Operation
- 'Multi-mode®' Operation enables amp to operate in 'Class-A' mode at lower volumes then switches to normal 'Class A-B' at higher volumes
- Advanced 'IOC' protection / Distortion Indicator (compares input and output signals and alerts user if distortion exceeds 0.05%)
- Signal Level Indicators
- Signal inputs that accommodate 'unbalanced' 1/4" plugs or barrier strip for permanent connection
- 1/4" Stereo headphone jack on front panel
- 1/4" jacks, barrier strip inputs and 5-way binding post / barrier strip outputs
- Power On, Signal Present and IOC LEDs
- 3-U Standard Rack Mountable Design


Specs:

- Frequency Response: ±0.1dB from DC (0Hz) to 20kHz at 1 Watt
- Signal to Noise Ratio: 112dB (20Hz to 20kHz) at full output
- Total Harmonic Distortion (THD): <0.001% from 20Hz to 400Hz and increasingly linearly to 0.05% to 20kHz at 95 watts.
- Intermodulation Distortion (IMD): <0.05% from 10mW to 0.25W to 95 W
- Damping Factor: >400 from DC (0Hz) to 400Hz Output Power:
Rated RMS Output: 95-100 watts per channel, min. RMS, @ 8Ω, & 170 wpc @ 4 Ohms both channels driven, from 20Hz to 20kHz.
- Bridge-Mono: 345 W into 8Ω
- Load Impedance: Rated for 16, 8, 4 ohm use
- Input Impedance: 30K Ω nominal
- Input Sensitivity: 1.30V for rated power into 8Ω
- Output Connector: Heavy duty, 3-way binding posts
- Output Impedance: <15 milliohms in series with <3 micro-henries
- Required AC Mains: 50-400Hz AC with selectable transformer taps for 100, 120, 200, 220, and 240 volts
- AC Line Connector: Standard 3-wire grounded connector input/Output:
- Input Connector: Un-balanced ¼" phone jack each channel and 3-terminal barrier block
- Accessory Input: 11-pin radial socket - accepts optional active or passive balanced input module
- Output Monitor: ¼-inch stereo phone jack on front panel
- Chassis Ground: two-terminal barrier block w/shorting strap

 Again, as stated before, our technician has completely refurb'd this Crown PS-200, stereo Power-Amp, cleaning and testing all and it gets our full 'Certification'. The Crown PS-200 is built around the Crown multi-mode circuit design, which provides utmost reliability and sonic accuracy at all listening levels. The multi-mode circuit, a three stage AB+B design, functions at low levels as a non-switching Class A amp. At middle power levels, the two-stage drivers continue as Class A devices with the output stages in Class B. At higher power levels, the multi-mode circuit drivers function in the AB mode, with output stages adding more Class B power. The multi-mode design uses output devices efficiently and powerfully, minimizes amp distortion whether audible or test bench detectable, and provides long-term reliability.
  Beautiful condition pro audio power amp by Crown, model PS-200! Excellent for most pro audio applications, as well as home stereo use. Also great music room amp for band rehearsal, and studio monitors. Lots of punch and headroom.
Huge power from a company know for building "rock solid", VERY dependable gear. Comes with e-copy of original Crown PS-200 brochure.
 Measures standard 19" 'rack-width' wide x 10.25" depth x 5.35" tall (3-rack spaces) and weighs 25 lbs unpacked. Includes our standard 90 day limited warranty.
CROWN PS-200 POWER AMPLIFIER
 Cond. 8.5
PRE-OWNED
(C) M.R.
SOLD 2-20-13
SHIPPED TO SOUTH CAROLINA

 

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


 

 

 



       

          NEW LISTING 8/14/12
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg (792 bytes)  warranty
VINTAGE HARMAN KARDON CITATION-16 / SIXTEEN
CLASSIC AND SERIOUS
STEREO POWER AMPLIFIER
CLASS-A / CLASS A-B
#...0147
Circa 1976-79

MADE IN THE USA!

SOLD 2/3/13
SHIPPED TO COLORADO

Our technician has completely gone through and 'Certified' this unit. Unit bench checked, necessary repairs made, cleaning / detailing inside and out, fully tested and Certified. Our technician reset the voltage to correct 120vAC. He then replaced EVERY electrolytic capacitor, including the four 10,000μF filter caps.



He actually 'upped' them to 12,000μF.

Prior to that, the amp did 'function' to a degree that the average 'ear' might no notice any issue with, however it had THE WORST condition capacitors we have ever come across (and we're talking many 'thousands' of units). Even considering we restore gear from the 1940s! The main filter caps had electrolyte so dried up, and so bad, you could actually hear the the crystallized electrolyte 'rattling around' inside when we shook them!!! The amp should have 'smoked' when powered up, but nothing 'drew' alarmingly on the vari-ac, however the amp did have -550mV on one side and -135mV on the other. Again, it still produced sound that the average person might perceive as 'passable'. I say all that to make you aware of the IMPORTANCE of having an amp gone thru, by a qualified technician. Most folks would not have noticed any of the issues until something 'went south' catastrophically.

All 16 original RCA brand, TO-3 output transistors removed, bad or questionable mica insulators replaced and fresh heat-sink compound installed. He also replaced the disintegrated 'plastic' pilot lamp escutcheons / lamp assemblies and changed the neon lamps from 'red' to 'blue'. As stated, the technician also replaced the balance of the electrolytic capacitors which then allowed the amp to be properly adjusted for bias and DC offset. Both main wafer switch wafers cleaned / burnished. LED panel mounting 'shored-up'.
Following above operations, all functions have been tested and pass with flying colors! Amp designed using Huge, TRUE DUAL Power Supply Transformers, with separate filtration, and MASSIVE, very efficient, externally located, vertically oriented heat sinks, for sufficient cooling. This amplifier is in both great electronic and physical shape. While it's not going to win any 'beauty contests' due to numerous, minor 'battle scars', there are no dented / bent corners or heat sinks (a miracle considering it's mass) (see above photos for details). Performs 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 for 48 hours and it functioned flawlessly (we actually took it into our 'demo' system and 'rocked-it' HARD on our Altec VOTT's. HUGE sound and thump).

  
On our test bench, this particular hk Citation 16 power amplifier, #...0147, unit's amplifiers produced 34.5 volts at 8 Ohms per channel for 148 continuous watts, and 30 volts @ 4 Ohms for 225 watts / channel discrete TO-3, output transistors. (16x RCA 0404. (Idle AC current draw @ .6A. & DC offset out = <7mV on either side. Bias set to 9.9mV. Floor noise measured at <0.1mVAC either side)

hk Citation Sixteen Features:

- Completely separate, DUAL power supplies (has a lot to do with how much this amp 'punches'. That, and the SIXTEEN output transistors.

- Output selectable for either 8 Ohm or 4 Ohm speakers (means you can 'truly' get all of your power into just one set of 8 Ohm speakers. All amps / receiver should have this, but sadly, few do)
- Stereo or Bridge Mono Operation (bridge operation requires a qualified technician to enable)
- Signal Level Indicators with multiple 'level' modes
- Signal inputs via standard RCA jacks
- Heavy duty binding post speaker outputs
- Power On & Signal Present & Signal Level
indicators
- 4-U Standard Rack Mountable Design


Harman Kardon Citation Sixteen / 16 Specifications:

- Rated RMS Output: 150 watts per channel, min. RMS, @ 8Ω, both channels driven, from 20Hz to 20kHz.
- Frequency Response:
5Hz to 70kHz
@ 8Ω, both channels driven, from 20Hz to 20kHz @ 75wpc.
- Signal to Noise Ratio: 100dB (20Hz to 20kHz) at full RMS output
- Total Harmonic Distortion (THD): <0.05% from 250mW  to 150 Watts both channels driven simultaneously 20Hz to 20kHz
- Square Wave Rise Time: >3 micro-sec.
- Slew Rate: >30 volts per micro-sec.
- Damping Factor: >300:1
- Load Impedance: Rated for 16, 8, 4 ohm use
- Input Impedance: 10K Ω nominal
- Input Sensitivity: 1.25V for rated power into 8Ω
- Output Connector: Heavy duty, 3-way binding posts
- Required AC Mains: 50-60Hz AC with selectable transformer taps for 100, 120, 220, and 240 volts and rated to 1200 watts draw
- AC Line Connector: Standard 3-wire grounded connector input/Output:
- Input Connector: RCA
- Output Monitor: Heavy Duty Banana / Binding posts

Again, as stated before, we have completely gone through this HK Citation Sixteen / 16, Power Amplifier cleaning and testing all and it gets our full 'Certification'. This is an amazing performing and sounding amp. We have 'stood on it' hard, with a number of our speaker loads (the most fun being when connected to our Altec 'Voice of the Theaters'. It's a huge sounding and punchy amp, with lots of 'head room'. Handles 'REAL' high power levels perfectly well. If you are looking for serious, vintage power, it ain't gonna get much better than this.
 Comes with e-copy of hk Citation Sixteen / 16 Owners Manual and Technical Manual.
 Measures standard 19" 'rack-width' wide x 14" depth x 9.5" tall (5-rack spaces) and weighs 55 lbs unpacked. Includes our standard 90 day limited warranty.
HARMAN KARDON HK CITATION 16 / SIXTEEN POWER AMPLIFIER
 Cond. 8

SOLD 2/3/13
SHIPPED TO COLORADO

(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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