Vintage amplifiers for sale

Vintage amplifiers for sale DEFAULT

Rare, Custom and Vintage Amps

A guitar amp is an electronic amplifier that functions by increasing the signal of an electric or acoustic guitar so that it can produce sound through a loudspeaker. A common misconception about guitar amps is that they are used solely to amplify sound. Most amplifiers are also able to modify the tone of an instrument by emphasizing or de-emphasizing certain frequencies, and by adding effects to create different sounds.

 

Amps were first used in the s as a way to amplify the sound of acoustic guitars. However, their use became more popular in the s when Hawaiian music surged in popularity. Initially, tone control on guitar amps was simple and could provide a lot of treble boost. However, their low power, and limited control gave poor high treble and bass output. In the s, musicians began to experiment with distortion by overdriving guitar amps. Later on, most guitar amps came with preamplifier distortion controls, fuzz boxes, and other units designed to produce distorted sounds. Today, the overdrive and distortion produced by guitar amps are important elements to many styles of electric guitar music.

 

Vintage amps come in two standard forms: combination or “combo amps”, which are made up on one amplifier, with one, two or four speakers, all housed in a wooden cabinet. As well as standalone or head amps, sometimes called the “amp head”, which do not incorporate a speaker, and generate sound through a speaker cabinet. A wide range of vintage amps exist, some intended for general purposes, where others are designed for particular instruments or sounds. These include:

  • Traditional guitar amplifiers – which produce a clean, warm sound, often used by traditional rock, country, and blues musicians. Nowadays, they have become popular with indie and alternative bands as well.
  • Hard rock guitar amplifiers – which tend to use pre-amplification controls, tone filters, and distortion producing effects to create their characteristic tone. This type of vintage amp is used in a wide range of music genres, including hard rock, punk and metal.
  • Bass amps –their extended bass response and tone controls that make them optimal for bass guitars.
  • Acoustic amps – these amps are designed to create a ‘clean’, ‘transparent’, ‘acoustic’ sound when used with acoustic instruments.

At VintageandRare.com, we showcase a wide selection of vintage amps, from dealers around the world, who can help you create whatever sound you are looking for. We carry a lot of Vintage Fender Amps, as well as a wide range of vintage, custom hand-made boutique amps. If you don’t find what you are looking for, check back often and see what’s for sale, since our selection changes daily.

Please scroll down and have a look at our collection of amazing amps.

 

See more>>

Sours: https://www.vintageandrare.com/category/Amps

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

 


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


PRE-AMPS:
 

         

    

NEW LISTING 9/1/
(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg ( bytes) warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGE PIONEER STEREO PRE-AMPLIFIER
THE VERY SOUGHT AFTER
PIONEER SPEC-1 (aka C)
RACK MOUNTABLE
W/ ORIGINAL BOX & PACKING
  #M
 Circa ~'82
"WORLD AC POWER"�
 MIJ
 for sale
 
� Our technician has completely gone through and 'Certified' this unit.
 
� Circuit boards inspected and found to be FREE of any potentially problematic, 'Black-Legged' transistors that we have been seeing more and more often over the past hand-full of years.

� Following ext / int visual inspection entire unit was cleaned inside and out including all contacts, switches and controls.
 
� Sluggish/ stiff power switch actuator removed, disassembled, cleaned and lubed



� 'Wafer' switches / selectors had their contacts burnished to remove 'sound robbing' tarnish.

� Switches and controls now clean sounding and performing solidly.

� Internal power supply found to be producing proper Voltages at outputs

� New # power / pilot lamp installed
 
� 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!

� Original, rear service bumpers still intact

� Original, bottom feet / pads still intact

� All Original, speaker input and output connectors perfectly intact
 
� Following electronic refurb, entire unit was cosmetically detailed

� RCA's all Dremel burnished / cleaned / polished

� Top sheet metal plate, looks as if it may have been refinished at one point
 
� Following service / refurb procedures, the unit was ran continuously for 72+ hours.
Very quiet. All functions operating perfectly. No power supply hum electrically or machanically.
Total restoration time investment 10+ hours. You will not be disappointed.
  
Very sought after for 'Spec Racks', the classic Pioneer Spec-1 pre-amplifier. Spec-1 preamps are the heart and 1st main building block for any, proper, Pioneer SPEC rack. Made to mate up with Pioneer's Spec-2 or Spec-4 power amps (or both as it has dual outputs). Cosmetically it's in BEAUTIFUL condition with nothing really worth mentioning.

All internal wiring very neatly routed and loomed.
All internal potentiometers and 'Step attenuators' ALPS brand. All circuit boards very clean with no corrosion or evidence of bad or amateur re-soldering. All internal metal clean with no corrosion. Looks virtually NEW inside!From the tech notes; "VERY clean inside. Probably spent most of it's life in the western US away from humid environments".    
From the original brochure; "EQ and Control Amplifier both designed with 3-stage, direct-coupled, Class-A 'SEPP' with 1st stage differential amplifier".
Does not appear to have every been rack mounted so no 'rack rash' around the mounting holes of the face plate.

With the exception of a small area on the rack handles, none of what's becoming very common 'Pioneer Green' corrosion. 

 

Pioneer SPEC-1 Pre-Amp Features and 'Creature Comforts' include:

 
- All internal potentiometers and 'Step attenuators' ALPS brand
- Speaker Selector (we know, preamps are not supposed to have speaker selectors on them, but we'll explain how that works below)
- Subsonic filter built-in for cutting turntable rumble
selectable CUT-OFF at 15Hz, 30 Hz or Off
- High filter for reducing tape hiss, tuner broadcast hiss, hiss from poorly recorded YouTube / TV videos or any 'electronic hiss) selectable 8kHz, 12kHz or Off

- Huge fixed Resistor, De-tented volume control (no typical "dirty volume pot" to ever have to worry about).
-
Tone Bypass switch for purest audio signal path if so desired
- 4-band Eq / Tone control using fixed resistor pre-sets. (No potentiometer tracks to get dirty and wear out) 
Bass centered @ 50Hz,
Mid Bass centered @ Hz, 
Mid-highs centered @ 10kHz, 
 and Highs centered @ 20Khz.
 - Pre-amp section 'Stereo / Mono' / Reverse / L/ R / L+R Stereo selector
- Dual tape deck monitors (Tape Monitors can be used with Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape Duplication / Dubbing capabilities
- Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amps and with Phono "2" having an infinitely variable attenuator selectable from 0 to dB level
- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.)
- DUAL AUXs 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.)
- Mic input featuring Mic Mixing control, On-Off and front located 1/4" input jack (great for DJ / Karaoke use - watch those 'Home Audio' grade speakers with an open mic)
- Stereo Mode selector for Normal, Reverse & Mono
- Instant volume Attenuator (Muting) selectable for 0, or dB (especially useful for 'fine tuning' the graduations in Volume Level as this unit is designed with a '3dB/Step' volume attenuator instead of a standard 'carbon trace pot').
- Front mounted 1/4" stereo headphone jack (only energized if speaker outputs from a power amp are connected)
- Rack Mount front plate with handles (designed for standard 19"  EIA racks).
- Rear panel features full RCA patch bay for all inputs (each 'fastened separately' to the rear panel, and 'point to point' wired internally, instead of being soldered directly to the circuit board, which is always a 'failure point').
- Dual ground lugs
- Power amp speaker connectors for A&B speaker selector and headphone use
- 5 AC convenience outlets; 3x Switched and 2x un-switched AC outlets for a maximum load of Watts of external gear.
- True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from v, v, v and Volts AC input.

  
Pioneer SPEC-1 Pre-Amp Original Specifications:
 

 
Circuitry:
"EQ and Control Amplifier both designed with 3-stage, direct-coupled, Class-A 'SEPP' with 1st stage differential amplifier".
S/N (IHF):
90dB for 'non-phono' inputs
THD: across kHz @ 2V output = % and @ 7V output = %
Freq Response (non-phono inputs): 10HzkHz at full rated power
Input Sensitivities 'AUX, TUNER & TAPE' inputs for full rated output: mV / k&#; via RCA's
Input Sensitivity 'Microphone' input for full rated output: mV / 50k&#;
Output at Main Output: 2V-7V for 'rated output' @ Ohms
Output at Tape Monitors: mV / k Ohms via RCA's
Sub Bass Control:  �dB @ 50Hz
Bass Control:
  �dB @ Hz
Treble Control:  �dB @ 10kHz
Upper Treble Control:  �dB @ 20kHz
Low filter:
@ 15Hz or 30 Hz or Off and 12dB/Oct
High filter: @8kHz or 12kHz or Off and 12dB/Oct
  
 Phono Section:

Freq Response: 30HzkHz (Limited by RIAA EQ standards)
 S/N: MM= 70dB (Shorted)
 Phono MM Sensitivity:
Phono 1; mV & 50k Ohms
Phono 2; mV to 10mV& 50k Ohms
Phono Maximum Input Level:
Phono 1; HUGE @ mV@ 1kHz
Phono 2; even HUGE'errr @ mV@ 1kHz

  
Again, as stated before, our technician has completely refurb'd this Pioneer SPEC-2 Pre-Amp, 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. This is only the second Pioneer SPEC-2 preamp we've had in 24 years of the website and the last was in
Comes with an 'e' copy / pdf download of the original Pioneer SPEC-1 Pre-Amp users manual and brochure, service manual if purchaser so desires.
Also comes with it's original Pioneer SPEC-1 box and packingand YES, the serial number on the box matches the unit!!!

Measures 19" wide x " deep x " tall and weighs 24 lbs unpacked. Includes our 90 day limited warranty!
Pioneer SPEC-1 Pre-Amp
Cond. +++
$
(C) M.H.

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

 

    

NEW LISTING 9/16/

(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg ( bytes) warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGE CARVER STEREO PRE-AMPLIFIER
CARVER C-1
"HIGH FIDELITY CONTROL CONSOLE"
SAME MODEL WE USE HERE IN OUR AUDITION / DEMO RACK
W/ ORIGINAL BOX & PACKING
  #
 Circa
SEMI "WORLD AC POWER"�
 MIJ
 for sale
 
� Our technician has completely gone through and 'Certified' this unit.

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

� Switches and controls now clean sounding and performing solidly (requires adding access ports for push switches).

� Internal power supply found to be producing proper Voltages at outputs
 
� 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!

� Original, bottom feet / pads still intact
 
� Following electronic refurb, entire unit was cosmetically detailed
 
� Following service / refurb procedures, the unit was ran continuously for 72+ hours.
Very quiet. All functions operating perfectly. No power supply hum electrically or machanically.
Total restoration time investment + hours. You will not be disappointed.
  
Quality CARVER C-1 pre-amplifier. Cosmetically it's in BEAUTIFUL condition with nothing really worth mentioning.

 

CARVER C-1 Pre-Amp Features and 'Creature Comforts' include:

 
- Sonic Holography Built-In (this was one of Bob Carvers, 'Signature' patents and were expensive when purchase separately. I sold them when new in the 's) (note; with "Sonic Holography" engaged, 'Balance' control has limited function)
- Infrasonic (Subsonic) filter built-in for cutting turntable rumble
selectable CUT-OFF at 18Hz and 12dB / OCT(rear panel switchable)
-
Tone Bypass switch for purest audio signal path if so desired
- Separate L&R Bass and Treble Controls
- 40Hz / Loudness (Bass turnover, increases effect and range of Bass controls when engaged)
- 8kHz / 12kHz (Treble turnover, increases effect and range of Bass controls when engaged {and changes their 'centers'})
 - Pre-amp section '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 / Dubbing capabilities
- Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amps and with Phono "2" having a built-in 'head-amp' for moving coil cartridges (that in itself is worth a few hundred $$$ if you are utilizing a 'Moving Coil' cart)
- Phono Loading for Phono #1; 0pf, pf or pf

- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.)
- DUAL AUXs 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.)
- External Processor Loop for direct connection of signal processors such as reverbs, delays, EQ's, etc. (may also be used as an additional 'pre-volume' input 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 (works with any 'dynamic' type headphones)

- Dual outputs for driving 2 power amps or feeding other external systems; whole house, mixer, computer, etc.
- 'Delayed' turn-on to the outputs mutes the signal for seconds so that amps do not get the initial cap charging DC surge
- "Speaker Off" switch disconnects main outputs

- Rear panel features full RCA patch bay for all inputs
- Dual ground lugs
- 6X AC convenience outlets; 3x Switched @ Watts and 3x un-switched AC outlets @ Watts for a maximum load of Watts of external gear.
- Semi "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC (would require a transformer for Voltage conversion).

  
CARVER C-1 Pre-Amp Original Specifications:
 

S/N (IHF):
96dB for 'non-phono' inputs
THD: across kHz < %
Freq Response (non-phono inputs):3HzkHz at full rated power
Input Sensitivities 'AUX, TUNER & TAPE' inputs for full rated output: (likely) mV / k&#; via RCA's
Gain thruto Main Output: 25dB for 'rated output' @ Ohms
Low filter:
@18Hz & 12dB/Oct
  
 Phono Section:

Freq Response: RIAA standards
 S/N: MM= 83dB w/ 5mV input
MC= 77dB w/ uV input
Phono Maximum Input Level:
MM; mV @ 1k
MC;
15mV
  
Again, as stated before, our technician has completely refurb'd this Carver C-1 Pre-Amp, cleaning and testing all and it gets our full 'Certification'. Entire unit, including the original knobs and anodized face are in beautiful condition. Unit looks beautiful and sounds great. This is the first Carver C-1 we've offered for sale. Yes, I know a lot of you knew about one here at the shop, but it's the one we use on our 'burn-in' bench and isn't for sale.
Comes with an 'e' copy / pdf download of the original CARVER C-1 Pre-Amp users manual and brochure.
Also comes with it's original CARVER C-1 box and packingand YES, the serial number on the box matches the unit!!!
Measures " wide x 9" deep x " tall and weighs 7 lbs unpacked. Includes our 90 day limited warranty!
CARVER C-1 Pre-Amp #
Cond. +++
$
(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 10/4/

(click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg ( bytes) warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGE CARVER STEREO PRE-AMPLIFIER
CARVER C-1
"HIGH FIDELITY CONTROL CONSOLE"
SAME MODEL WE USE HERE IN OUR AUDITION / DEMO RACK
W/ ORIGINAL BOX & PACKING
  #
 Circa
SEMI "WORLD AC POWER"�
 MIJ
 for sale
 
� Our technician has completely gone through and 'Certified' this unit.

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

� Switches and controls now clean sounding and performing solidly (requires adding access ports for push switches).

� Internal power supply found to be producing proper Voltages at outputs
 
� 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!

� Original, bottom feet / pads still intact
 
� Following electronic refurb, entire unit was cosmetically detailed
 
� Following service / refurb procedures, the unit was ran continuously for 72+ hours.
Very quiet. All functions operating perfectly. No power supply hum electrically or machanically.
Total restoration time investment 4+ hours. You will not be disappointed.
  
Quality CARVER C-1 pre-amplifier. Cosmetically it's in BEAUTIFUL condition with nothing really worth mentioning.

 

CARVER C-1 Pre-Amp Features and 'Creature Comforts' include:

 
- Sonic Holography Built-In (this was one of Bob Carvers, 'Signature' patents and were expensive when purchase separately. I sold them when new in the 's) (note; with "Sonic Holography" engaged, 'Balance' control has limited function)
- Infrasonic (Subsonic) filter built-in for cutting turntable rumble
selectable CUT-OFF at 18Hz and 12dB / OCT(rear panel switchable)
-
Tone Bypass switch for purest audio signal path if so desired
- Separate L&R Bass and Treble Controls
- 40Hz / Loudness (Bass turnover, increases effect and range of Bass controls when engaged)
- 8kHz / 12kHz (Treble turnover, increases effect and range of Bass controls when engaged {and changes their 'centers'})
 - Pre-amp section '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 / Dubbing capabilities
- Dual Phono / Turntable inputs w/ 'Built-in' phono pre-amps and with Phono "2" having a built-in 'head-amp' for moving coil cartridges (that in itself is worth a few hundred $$$ if you are utilizing a 'Moving Coil' cart)
- Phono Loading for Phono #1; 0pf, pf or pf

- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRUS� etc.)
- DUAL AUXs 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.)
- External Processor Loop for direct connection of signal processors such as reverbs, delays, EQ's, etc. (may also be used as an additional 'pre-volume' input 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 (works with any 'dynamic' type headphones)

- Dual outputs for driving 2 power amps or feeding other external systems; whole house, mixer, computer, etc.
- 'Delayed' turn-on to the outputs mutes the signal for seconds so that amps do not get the initial cap charging DC surge
- "Speaker Off" switch disconnects main outputs

- Rear panel features full RCA patch bay for all inputs
- Dual ground lugs
- 6X AC convenience outlets; 3x Switched @ Watts and 3x un-switched AC outlets @ Watts for a maximum load of Watts of external gear.
- Semi "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC (would require a transformer for Voltage conversion).

  
CARVER C-1 Pre-Amp Original Specifications:
 

S/N (IHF):
96dB for 'non-phono' inputs
THD: across kHz < %
Freq Response (non-phono inputs):3HzkHz at full rated power
Input Sensitivities 'AUX, TUNER & TAPE' inputs for full rated output: (likely) mV / k&#; via RCA's
Gain thruto Main Output: 25dB for 'rated output' @ Ohms
Low filter:
@18Hz & 12dB/Oct
  
 Phono Section:

Freq Response: RIAA standards
 S/N: MM= 83dB w/ 5mV input
MC= 77dB w/ uV input
Phono Maximum Input Level:
MM; mV @ 1k
MC;
15mV
  
Again, as stated before, our technician has completely refurb'd this Carver C-1 Pre-Amp, cleaning and testing all and it gets our full 'Certification'.About the only cosmetic issue worth mentioning is that it appears that the volume knob has been refinished at some point. Overall, the unit, including the original knobs and anodized face are in great condition. Unit looks good and sounds great. This is the second Carver C-1 we've offered for sale. Yes, I know a lot of you knew about one here at the shop, but it's the one we use on our 'burn-in' bench and isn't for sale.
Comes with an 'e' copy / pdf download of the original CARVER C-1 Pre-Amp users manual and brochure.
Measures " wide x 9" deep x " tall and weighs 7 lbs unpacked. Includes our 90 day limited warranty!
CARVER C-1 Pre-Amp #
Cond. +
$
(C) R.R.

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




 

 

 


POWER AMPS:
 

         

          NEW LISTING 4/15/20
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REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGEDYNACO STEREO POWER AMPLIFIER
 DYNACO "STEREO " POWER AMP
DC OFFSET ADJUSTED TO SUPER LOW LEVEL
OUTPUT BIAS SET TO SPEC
#
 Circa
 MADE IN U.S.A.
for sale

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

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



Floor noise measured at L& R = > dBm

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


DYNACO STEREO Original Specs:
Design type:
2 Channels, AB operation
Rated RMS Output Stereo ,Hz: Watts per channel, min. RMS, @ 4&#;
75 Watts per channel, min. RMS, @ 8&#;
Rated RMS Output Bridged Mono ,Hz: Watts per channel, min. RMS, @ 8&#;
Damping Factor:@ 1kHz / 8&#;: >80
@ 50HzkHz / 8&#;: >50
Signal / Noise: >95dB @ 75Watts
THD; <% @ rated power / 8&#;
IMD; <% @ rated power / 8&#;
Input Sensitivity: V for 75 Watts output
Input Impedance:35k Ohms
Channel Separation: >70dB @ 20HzkHz
Freq response:10HzkHz @ 8&#;
Max Power consumption:
Watts

Again, our senior tech has completely gone thru this Dynaco Stereo and it gets our full 'Certification'.  Cosmetically it has a few 'battle scars', but nothing too distracting (see photos above). Only 'performance' issue to be aware of is that Dynaco amps do not have 'relays' to block 'turn On / Off' thumps / sounds, so at turn-on you will hear a bit of 'electronic noise' as the circuits come to life, but nothing that is destructive. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 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 " wide x " deep x " high and weighs ~26 lbs unpacked. Includes our 90 day limited warranty.
 DYNACO STEREO , 2-CHANNEL POWER AMP
Cond.
$
 (C) R.R.

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


 

 

    

         NEW
LISTING 6/17/19
 (Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg ( bytes)warranty
REFURBISHED / FULLY SERVICED & WARRANTED 
 VINTAGEDYNACO STEREO POWER AMPLIFIER
 DYNACO "STEREO " POWER AMP
#
 Circa
 MADE IN U.S.A.
for sale

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

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

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

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

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

Again, our senior tech has completely gone thru this Dynaco Stereo and it gets our full 'Certification'.  Nickel / chrome plating is in great shape with none of the typical surface pitting / corrosion / rust. Perforated, top cover also rust and dent free. Unit looks, works and sounds great! Again, while not much on cosmetics or 'button features / whistles or bells' Dynaco amps are known for incredible punch, headroom, and musicality. Includes an 'e-copy' pdf download of the Dynaco Stereo 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 " wide x 13" deep x 4" high and weighs 20 lbs unpacked. Includes our 30 day limited warranty.
 DYNACO STEREO , 2-CHANNEL STEREO POWER AMP
Cond.
$
 (C) R.R.

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

 

b&k_av_5-multi-channel_av_amplifier_web.jpg    

  b&k_av_5-multi-channel_av_amplifier_collage.jpg

          NEW LISTING8/24/12
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CheckMarkSmall_web.jpg ( bytes)warranty
B&K MULTI-CHANNEL
AV
5-CHANNEL
AUDIO / VIDEO POWER AMPLIFIER
#

Circa
"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 (#) FIVE (5) amplifiers produced Volts at 8 Ohms per channel for 56 Watts / channel and Volts at 4 Ohms per channel for 78 Watts / channel (4 Ohm operation not recommended) via discrete output transistors (5x LMT. (Idle AC current draw @ A. DC offset / out <2mV each channel.
   

   Great condition, late model, 5-Channel power amp by B&K. Model B&K AV 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
- VDC 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 v, v, v and Volts AC input.

 

Also from the OM:  
"The most obvious function for the AV series II is to take five separate
audio inputs and provide five separate amplified outputs. Your AV
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 AV 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 AV 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 AV Specifications
(II specs, but essentially the same amp):
 "60 Watts per channel minimum RMS, @ 8Ohms, 1k, with no more than % THD"
   Design type:5 Channels, Class-A/B operation
Input Sensitivity:V
Input impedance:k Ohms
THD: % @ 1kHz
   Power Bandwidth:5HzkHz
Slew Rate:14V / mSec
Damping Factor:80 / 8 Ohms
Signal / Noise:95dB A weighted
Dynamic Headroom:1dB
Max Power Consumption: Watts
 
    
 Again, as stated before, our technician has completely gone thru this B&K AV, multi-channelPower-Amp, cleaning and testing all and it gets our full 'Certification'.Overall amp in great cosmetic condition, with only minor wear to the top cover. Unit looks, works and sounds great! Includes a pdf 'e' copy of the B&K AV owners / users manual. Unit measures 17" wide x 12" deep x " high and weighs 23 lbs unpacked. Includes our standard 90 day limited warranty.
B&K AV MULTI-CHANNEL POWER AMPLIFIER
Cond.
$

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

   

 

         

NEW LISTING 8/24/
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FULLY SERVICED / BENCH TESTED
ADCOM STEREO POWER AMPLIFIER
ADCOM GFA
MOSFET OUTPUTS
 #
Circa
for sale

�  Our technician has completely gone through and 'Certified' this unitcleaning all.

� Amp has been cleaned inside and out.

�  Internal fuses checked for correct values and function

� Bias and DC offset set correctly (DC offset was actually able to be set to ZERO on both L & R!)

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

Amp designed using Huge, Toroidal Power Supply Transformer, Dual power supply and super quality (expensive) filter caps. Huge, vertically finned heat sink for very efficient and silent, passive cooling of output devices (all amps / receivers should be designed this way). This amplifier is in both great electronic and physical shape. Looks LIKE NEW and sounds fantastic! All inputs tested and both side produces clean and even sine waves! No power supply hum of any kind. It's dead silent! Following restoration procedures, we burned it in, in the shop at continuous high volume for 8 hours straight and it functioned flawlessly.
Technician's note:
"VERY good build quality"
   
On our test bench, this unit's (#) amplifiers produced 30 Volts at 8 Ohms per channel for Watts / channel and 27 Volts at 4 Ohms per channel for Watts / channel via discrete, Mosfet output transistors; 4x IRFP & 4x IRFP (DC offset adjusted to 0mV (as in "ZERO" per channel!!!). Floor noise >dBm. Idle AC current draw @ A)
   
Great "general purpose" power amp for a variety of consumer and Pro-Audio applications. Super quiet operation and build quality. We run this amp in our main demo system and have for a few weeks now and Love it!!! Great for full range stereo speakers, Studio Monitors, home audio, practice PA etc.
For you 'tech-savvy' types, here's an excerpt from the original manual regarding amp design:
"Low number of gain stages improves signal reproduction accuracy""Custom toroidal power transformer provides better regulation and greater peak current capability""Large, internal heatsinks for greater cooling capability of output devices".
    
The final output stage uses multiple lateral, Precision Matched, MOSFET�s (Metal Oxide Semiconductor Field Effect Transistors): four devices per channel in the GFA These devices, unlike conventional bipolar transistors, have a negative temperature coefficient, which means that they do not exhibit �thermal runaway�. Thermal runaway is a phenomenon whereby a transistor heats up as it conducts more current, which causes it to get hotter, and conduct more current, and so on, until the device self-destructs. Since MOSFET�s are inherently self-protecting, no sonically degrading, complex circuitry is required to monitor and protect the output devices.

Furthermore, these lateral MOSFET�s exhibit a very linear input to output transfer function. Their connection in circuits and operating characteristics are very similar to vacuum tubes, which is perhaps responsible for their widely recognized sonic trait of being very �musical� and non-fatiguing.

 
ADCOM GFA FEATURES:
  





1)- Dual Power Supply
4)- Discrete, Precision Matched, MOSFET Output transistors
2)- 40,
&#;F of power supply filter capacitance with low ESR
8)- Custom toroidal power transformer

- Two Channel, Class A-B architecture
3)- Very Large internal heatsinks to keep the outputs cool with matching bottom and top plate louvers to facilitate air flow
- Silicone output insulators instead of typical 'white paste'
)- Super Quality internal construction methods
6)- Internally wired with heavy gauge wire
5)- All, proper, 'old-school' components inside. NO anemic, low current SMD parts!
- 'Soft Turn-On / Turn-Off' protection against "turn-on / turn-off" transients
- LED distortion detection indicators (Distortion Alert circuit is a unique Adcom system which reads all forms of non-linear distortion such as excessive THD, IM, Slew-induced, 'clipping' etc. The LED's will react when any type reaches 1%)
- Thermal protection for amplifier w/ LED indicators
7)- Point to Point I/O jack wiring (not directly soldered to circuit boards avoids flexing solder joints)
7)- Gold PlatedRCA input signal jacks
7)- Speaker outputs via 5-Way binding / banana posts

  
 Cosmetically it's in decent shape. There's a few tics / finish wear across the front edges, some scratches on the top and one side, but nothing distracting, especially when viewed from the front. Works and sounds great!We've actually been using this amp on our shop audio system following it's bench service for a couple months and it's performed flawlessly (in fact, once it sells, not sure what we're going to put in it's place that will test speakers so well).
  
ADCOM GFA ORIGINAL SPECIFICATIONS / SPECS:


Dynamic Headroom @ 4 Ohms: dB
Input Sensitivity (for 80 Watts @ 8 Ohms): VRMS
THD:% @ 1kHz
Power Bandwidth: 3Hz to Hz
S/N: >dB @ 80 Watts @ 8&#; un-weighted
Gain:29dB
Rise Time: 5kHz, 80V p-p w/ square wave, from % = &#;sec
Damping Factor: > to 1k / 8&#; & > to 10k / 8&#;
Input Impedance: k ohms unbalanced
Connectors (each channel): Input: Gold Plated RCA. Output: 5-way binding posts
Cooling: Convection (Vertically mounted, heat sinks)
Amplifier Protection: Full thermal
Speaker Protection: 'Soft Turn-On / Turn-Off'
Power Consumption: VA @ 'quiescent' and VA at max output
  
Rated Output Power (per channel):
Continuous Average Output Power Both Channels Driven:
8 Ohms, 20Hz - 20kHz, % THD: 80 Watts
4 Ohms, 20Hz - 20kHz, % THD: Watts
  
Again, we have completely gone through the unit cleaning and testing all. On our test bench, both amplifiers produce perfectly clean and symmetrical sine waves at both 8 & 4 ohm loads.
Includes an 'e-copy' pdf download of the Adcom GFA owners / users / instruction manual and the service manual if purchaser desires. Measures 17" wide x deep x " tall and weighs 22 lbs unpacked. Includes our standard 90 day limited warranty.
ADCOM GFA
Cond. 8+
$
 
(Cons.) R.R.
 
 
(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 <% 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 's and certainly was in 'full force' past the early 's for most 'main stream' consumer-grade audio amplifiers. Unfortunately this also 'suppressed' tone and 'punch' (musicality) but it made the numbers look good to the 'spoon fed' consumer (kind of like overly high speaker wattage numbers, and sorry if you're in that group and, most folks were so you're not alone). Secondly manufacturers were moving away from 'discrete-transistor' output designs to more 'monolithic' 'power-pack' output designs. While these designs reduced power supply requirements, thus reducing parts costs and weight (also translates to lower prices due to savings on freight from Asia) they generally sounded anywhere from somewhat 'anemic' compared with the designs from a few years previous, to completely 'gutless' and 'un-musical'. But, hey,� they had very low distortion figures�.Can anyone say 'threw the baby out with the bath water'?
Excerpts of the above text from the website of one of the best Car Audio sites and stores in the world, 'Car-Fi' www.car-fi.com .  

 

 


 


INTEGRATED AMPS:
 

         

NEW LISTING 9/1/
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REFURBISHED / FULLY SERVICED / WARRANTED
VINTAGE MARANTZ STEREO INTEGRATED AMPLIFIER (CONSOLE AMPLIFIER)
CLASSIC MARANTZ
#
MIJ
Circa  
for sale

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

� Everything was cleaned inside and out including all switches, controls and contacts. Cleaned and re-lubed all control shafts. Access ports created on push switches. ('Balance' control still has slight noise when manipulated after multiple cleaning).

� Replaced missing line fuse w/ correct value

� Intermittent power issue tracked down to bad solder joint found and repaired at transformer primary input

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

� All circuit boards inspected for any 'black legged' devices and none found

� Removed semi-conductors from heat sinks and old, crusty heat sink compound replaced on outputs and voltage rectifiers / regulators

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

� All functions tested for perfect operation.

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

� Walnut wood veneer cabinet had structural issues addressed as well as loose veneer sections. Following that, had a fresh coat of lemon oil applied. Looks beautiful.

� 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!

� 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 72+ hours. (Technicians note, "this is a fairly 'tech friendly & serviceable' amplifier design")
Total tech time 9 hours.


On our test bench, each internal amplifier of this particular unit, #, produced peak power of Volts per channel at 8 ohms for 69 Watts per channel and Volts at 4 ohms for 98 Watts per channel via discrete output transistors @ 1kHz. Bias set to proper 12mA at emmiters.
DC offset set to no greater than 23mVDC either channel. AC Idle current at mA. Floor noise >dBu.
 
____________________________
 
This is the first Marantz we've had in almost 3 decades (really "ever")! BEAUTIFUL Brushed Aluminum Face surrounded by originally optional Walnut cabinet. Marantz Stereo Integrated Amplifier looks and sounds great!Great amp for 2-channel stereo systems up to medium-large and "recording studio" use. "Real" output transistors and substantial power supply! Just a great 'all-around utility' amplifier for probably more than 80% of the audio systems out there.
 
Marantz Features include:
 
- Real Class A/B amplifier architecture
- A or B of OFF speaker select
- Super qualityvolume control
- 3-Band, Graphic EQ, w/ Separate Bass, Mid and Treble with high quality de-tented controls

- �EQ / Tone Defeat� for purest signal path and most un-adulterated sound

- 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� / SIRIUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape Dubbing capability
- Dual Phono / Turntable inputs w/ built-in Phono Pre-Amps
- Tuner input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs)
- AUX input (can also be used for ( Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� etc. inputs)
- Loudness function to increase �fullness� of sound at lower volume levels by accentuating the Lower and Upper frequencies relative to the mid range.
- Built-in High filter for reducing 19 kHz FM pilot tones and tape hiss and AM noise
- Pre-out / Main-in loop (allows feed to an additional / larger power amp, or to 'direct feed' the power-amp in the receiver with another pre-amp or audio mixer)

- Stereo / Mono Selector

- Front mounted
" stereo headphone jack
- Back panel features full RCA patch bay for all inputs. Spring-loaded, Push type speaker connectors for A&B and Quad AC convenience outlets2x Switched and 2x un-switched AC outlets for a maximum load of Watts of external gear.

 
Marantz Specifications:
 
 
Output: Continuous 45 Watts per channel, min. RMS, @ 8 Ohms & 57 Watts per channel, min. RMS, @ 4 Ohms, both channels driven, from 20Hz to 20kHz.
Power Band Freq Response:20HzkHz
Design type: 2 Channels, Integrated Pre /
 Class A/B operation Power Amplifier
Damping Factor: >[email protected] 20Hz into 8&#;
THD and IMD: % at full rated power into 8&#; w/ kHz
Freq Response of Pre-amp:20HzkHz
S/N:dB @ "Main-In" @ 88dB on Pre
Bass Control:  �12dB @ 50Hz(taken from OM)
Mid Control: �12dB @ Hz (taken from OM)
Treble Control: �12dB @ 15kHz (taken from OM)
High Filter:  dB / oct @ 9kHz (taken from OM)
Loudness Control: +dB @ Hz (dB Vol Level) ('assumed' as this is typical rating from other units)
Input Sensitivities (Non-Phono): mV / 25k&#;
Pre outputs: V w/ mV @ AUX with a max of V w/ mV at input
Output Impedances: Tape Out &#;, Pre Out &#;

PHONO SECTION SPECS:
Freq Response:
RIAA standard w/ RIAA Equalization of �dB or 20HzkHz
S/N: >78dB
Dynamic Range: >96dB
Input Sensitivity:mV @ 47k&#; (works VERY well with most MM cartridges)
Phono Overload: mV @ 1kHz

This is a very 'musical' sounding integrated amplifier. Very 'punchy' with great detail across the audio spectrum. You can really appreciate the 'discrete' outputs over more modern amplifier architecture with 'chip / STK / Darlington' type outputs, or as my tech wrote on the service work sheets,
"Clean, symmetrical Sine waves. Well balanced output signals left and rightGreat Old School soundOld School Serviceability".
Again as stated earlier, the Amp has had our standard FULL SERVICE inside and out including cleaning all control pots and contacts, replacing any necessary parts, and completely tested. All functions have been tested and passed with flying colors! Face and knobs are in excellent condition with only a few, very minor striations. Real, Walnut wood veneer cabinet also in fabulous shape. Unit looks and sounds great! Includes pdf download of Marantz owners / users / instruction manual (as the OM for the seems to be 'un-obtainium').
Measures 18" wide x " deep x " tall and weighs 27 lbs unpacked. Includes our day limited warranty!
MARANTZ
 Cond. +
 
$


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

 

 

 

 

    



        NEW ADDITION
8/20/19
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CheckMarkSmall_web.jpg ( bytes)warranty
REFURBISHED / FULLY SERVICED & WARRANTED
OLD-SCHOOL, 2-CHANNEL STEREO
VINTAGE KENWOOD STEREO INTEGRATED AMPLIFIER
KENWOOD
KA / KA
BIG 'DYNAMIC' POWER AND LOADS OF INPUTS!!!
#
  Circa
"WORLD AC POWER"�
MIJ
for sale

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

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

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

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

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

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

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

� All functions tested for perfect operation.

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

� Even though all Power and Function Indicator illumination lamps were in working condition, we replaced all; 6x # and 1x #

� 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!

� Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours.
Total tech time 13 hours.


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

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

Kenwood KA Features include:

  
- Discrete Output Transistors
- Large, power supply for plenty of headroom 
- Speaker selector for A or B, A+B or Off 
- Separate Bass and Treble controls, utilizing NOT pots, but a 2dB, 'Wafer Attenuator' and are TRUELY 'de-featable' for purest signal path when set to 'OFF'
- Serviceable, 'Open' body switches for ease of future cleaning
- Dual Tape Monitors with Bi-Directional dubbing (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc. as well as for CDR)
- Dual AUX Inputs(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.)
- Tuner input (may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.)
- Both Tape I/O's feature DIN as well as standard RCA I/O's
- Dual Phono / turntable inputs with built-in cartridge pre-amp
- Stereo Mode switch for Stereo / Mono-Mix / Stereo-Reverse, L or R selector (very handy for trouble-shooting system and speakers
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Dual, Built-in Low / Sub-Sonic filters for cutting turntable rumble / hum. 40Hz and 80Hz
- Built-in High filter for @ 7 kHz. Great for reducing AM noise
 - Instant dB Audio-Muting / Volume attenuation

- Front mounted 1/4" stereo headphone jack
- Front mounted. L&R 1/4" 'Microphone' jacks (be careful running microphones into your 'home audio' speakers)
- Rear located 'Mains' protection fuse
 - Pre-Amp out / Power-Amp In RCA loop with built-in Normal / Separate switch (no need for jumpers).
- Quad convenience AC outlets; 3 Switched and 1 un-switched for a total capacity of Watts
- True "WORLD AC POWER"� allows unit to be operated on 50 or 60 Hz AC and will select voltages from v, v, v and Volts AC input.

Kenwood KA Original Specs:
  
Design type: 2 Channels, AB operation
Dynamic Power Watts / Channel @ 4 Ohms
Rated RMS Output Watts per channel, min. RMS, at 8 Ohms, both channels driven, from 20Hz to 20kHz.
Damping Factor DC, / 8&#;:32
Power BandwidthHzkHz
THD; % at full rated power (40 W) into 8&#; w/ kHz.
S/N on Phono MM w/ mV signaldB
S/N on Tuner / AUX / Tape w/ mV signaldB
Input Sensitivity Phono (MM): mV @ 50k&#;
Input Sensitivity Microphone:3mV @ 50k&#;
Input Sensitivity Tuner / AUX / Tape mV @ k&#;
Input Sensitivity Main Amp:1V @ 50k&#;
Tape Rec Level (Via RCA's):mV
Tape Rec Level (Via DIN):40 mV
Bass Control; �10dB @ Hz (2dB 'Step Switch Attenuator)
Treble Control; �10dB @ 10kHz (2dB 'Step Switch Attenuator)
Subsonic Filter: 40Hz, 12 dB/Oct
Low Filter: 80Hz, 12 dB/Oct
High Filter: 7kHz, 6 dB/Oct
Loudness Control: +8dB @ Hz & +3dB & 10kHz (dB Vol Level)

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


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        NEW LISTING 5/1/19
(Click on above thumbnails to enlarge photos)
CheckMarkSmall_web.jpg ( bytes)warranty
REFURBISHED / FULLY SERVICED & WARRANTED
VINTAGE PIONEER STEREO INTEGRATEDAMPLIFIER
PIONEER SAII / SAII
#F
Circa
MIJ

SOLD 3/1/
SHIPPING TO KEN IN FLORIDA


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

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

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

�  Input function switch replaced as the original had intermittent issues

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

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

�  New AC Power / Pilot lamp installed

�  Amplifier section had output bias and DC offset checked to acceptable levels after 10 min warm-up.

�  All functions tested for perfect operation.

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

�  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!

�  Following restoration procedures, the unit was run continuously at medium volume, as all our amplifier / receivers are, into a load with "Loudness" on and both Tone Controls at 10 for 48 hours. (Technicians note, "this is a very 'tech friendly & serviceable' amplifier design")
Total tech time 6+ hours.

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

Pioneer SAII Features include:
   

- Discrete Amplifier Output design 
- Speaker A, B Off selector
- Separate Bass and Treble controls featuring high-quality, de-tented controls
- "Tone" switch to bypass tone controls for purest, most un-adulterated signal path
- "Loudness" function to boost Bass and Treble in relationship to Mid frequencies at lower volume levels for a much fuller sound.
- Dual tape deck monitors
(Tape Monitors can be used with Tape decks such as Cassette Tape Recorders/ Players, Reel to Reel's, 8-Track Tape Cartridge Decks, Video / CD / DVD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iTouch� / iGadget / MP3 / XM� / SIRIUS� CDR (CD recorders as well as for inserting signal processors, such as EQ's, Reverbs, Spatial Enhancers / Dynamic Processors, Noise Reduction units, Special Effects units, Time Delays, etc)
- Tape Dubbing 1->2 Capability
- Phono / Turntable input with Built-In Phono Pre-Amp
- AUX Input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.)
- Tuner input
(may also be used for Video / CD / DVD / LD / VCR / DAT / MP3 / iPod� / iPad� / iPhone� / iPod� / iTouch� / iGadget / eReader / MP3 / XM� / SIRIUS� etc.)
- 1/4" stereo headphone jack
- Spring loaded, 'Push'' speaker outputs
- Quad AC Convenience outlets (2 switched and 2 un-switched) with a total capacity of Watts


Pioneer SAII Original Specs:

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

S/NdB for Tuner, Tape and AUX inputs
Bass Control:+9dB /[email protected] Hz
Treble Control:  +8dB /[email protected] 10kHz
Loudness Control: +8dB @ Hz & +5dB @ 10kHz (dB Vol Level)

Input Sensitivities: Non-Phono inputs = mV / 50k&#;
Non-Phono Inputs: mV / 50k&#;
Tape outputs: mV / 50k&#;

PHONO SECTION SPECS:
Freq Response:
20HzkHz w/ RIAAEqualization of �dB
S/N:

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Vintage amplifier /receiver buying tips

For audiophiles, there’s no doubting the appeal of vintage audio equipment. Part of it has to do with rarity, the thrill of hunting down a Marantz stereo receiver from the s, heritage speakers by Klipsch or JBL, or a vintage Thorens turntable. Part of it has to do with fidelity, that the old stuff sounds better. And part of it has to do with charm and character. Vintage units just have that special something that modern equipment lacks.

“I constantly use the analogy of vintage cars running parallels with vintage audio,” says Mike Garry, owner of Hudson Valley HiFi, which specializes in buying, restoring and selling vintage audio equipment. “The early s muscle car may not be as reliable or perform as well as a modern one, but there is just something cool and fun about the year-old model.” Like with vintage cars, vintage audio depends a heck-of-a-lot on restoration. Old gear naturally breaks down over time and needs new parts to perform at their best. A lot of these vital parts, also, aren’t being made anymore because they’re so old, so restoring them isn’t a quick fix for technicians at these vintage audio shop. For consumers, this means they are either finding non-working units and getting them restored, or likely paying a premium on restored units.

Garry’s shop, Hudson Valley HiFi, is located in Cornwall, New York, on the western shore of the Hudson River, and it specializes in both modern and vintage audio gear. “Unlike most audio equipment businesses out there, the most common equipment we sell is two-channel stereo,” he said. For vintage restoration, Garry says that they work primarily on the s vacuum tube gear and s solid-state. To get a little more insight, we asked Garry to share the most popular receivers and amplifiers that people come to his shop for. The answers, in all his own quotes, are below.

Some of the below quotes have been edited for brevity and clarity.

Fisher c Stereo Receiver

“The Fisher c was a wonderful receiver made in New York in the early s. It was one of the first FM stereo tuners to use multiplex, which is the same system for FM stereo used today. It utilized a variant of the 6L6 power tube which provided 32wpc powering most efficient speakers at that time. The c was a little over $ new, which at the time was a good chunk of change. The prices of Fisher tube gear have skyrocketed and it is difficult to find good clean examples — now but they are still out there. I highly advise against playing these units without proper restoration, since wall voltage is quite a bit higher than when these were new and this increases the voltages in the amp. There are many mods we do to Fisher gear to make them safer and run a little cooler on modern wall current.”

Learn More: HereLearn More: Here

Marantz Stereo Receiver

“If any marketing team wants to see a successful campaign from the mids, they can check out the brilliant ads for the Marantz Ads included a story of a fire in an apartment building in which a beloved fell through the floor yet survived only requiring a new power cord since the original had melted. Thanks to their marketing, Marantz sold a ton of receivers and it became an icon. The aluminum faceplate with beautiful dashed knobs, three sets of four buttons below a blue backlit dial, has such appeal even 45 years after it hit the market. The sound of the receiver is so enjoyable even Marantz’s current two-channel amps are voiced similar to the ”

Learn More: HereLearn More: Here (eBay)

Pioneer SX Stereo Receiver

“In the later years of the s, the big receiver builders were at each other’s throats building the biggest most powerful units they could. The Pioneer SX is not the biggest or the most powerful — but it is huge, heavy, and has plenty of power. My feeling is the big receivers of Pioneer’s SX-x50 series were the best-designed receivers from that era. Huge toroidal power transformer with massive filtering capacitors created a well-designed power supply to feed the beast. The silver faceplate and dial with very elegant lighting, wrapped in walnut make it one of my favorites in terms of looks. These, like many big receivers, do need a ton of work to restore, but once done they are just plain fun to play.”

Learn More: HereLearn More: Here (eBay)

McIntosh MC Vacuum Tube Amplifier

“There are many well-known hi-fi brands but McIntosh always seems to be a common ‘name drop’ when someone wants to emphasize quality. They’re built-in Binghamton, New York from essentially scratch, Mac tube amps have been increasing in value tremendously in the last decade. Using their proprietary auto-bias system for power tubes and beautiful potted transformers these amps are easy to roll tubes for different sound characteristics. The McIntosh MC is a 6L6 push-pull power amp making 40wpc, hand-wired point to point design, and has a very robust power supply. The iron is very heavy on this amp which any valve amp builder will tell you the quality of an amp can be measured by the weight of its transformers. We see many Mac tube amps but the MC is definitely the most common coming in for restoration.”

Learn More: Here (eBay)

Dynaco ST70 Stereo Tube Amplifier

“Today, the big appeal of the Dynaco ST70 is that [it’s usually] fairly reasonably priced. The amp can be restored with its original design intact or, if one desires, it can be heavily modded just by removing the driver board and replacing it with one of the many modern boards available. By replacing the board you essentially change the entire circuit design and gives you the ability to use different driver tubes than the original difficult to find triode/pentode. The ST70 is easy to work on since it was designed as a kit and with push-pull EL34 power tubes, there are many options to tube roll to change its sonic characteristics.”

Learn More: Here (eBay

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