Audio Proz Service and Sales


A-PA1 Solid State Stereo Phono Pre-amp

Audio Proz Inv #: 27173

Stereo Phono preamp.

$ 24  Contact Us  

Accuphase C200

Audio Proz Inv #: 27016

Excellent preamp - one of the best ever made!!! All special design. Ground lifted all input. RF protected/shielded. Tape 1 to 2 copy. Tone controls are switched resistor/eq circuits. High variable frequency turnover. 3 auxiliary ins, tuner in, 2 phonos. Super quality phono preamp. With gain controls. Ultra quiet. Serviced, callibrated, cleaned and excellent condition.

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ADA MB-1 Guitar Preamp

Audio Proz Inv #: 59229

Super clean and low use condition. Original high quality tubes, Nationals made in China. These are super low noise version tubes REV 2.05. Low use time was used in personal studio, not roaded. 9/10 condition, very minor rack rash at holes, recent battery cleaned and calibrated.

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Adcom 6FP 555 II

Audio Proz Inv #: 63473

Basic preamp. Top quality phono (with correct ground layout)! Audiophile tone controls, only accent extreme high and low. 5 inputs, bad obvious light scratch at switch, #8- condition. 

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Adcom GFP-750

Audio Proz Inv #: 27515

Minimalist version, no tone controls - volume only, balance control, processor loop, stereo/reverse/mono control, cd balanced input + RCA, balanced main outs + 2 RCA, cleaned controls, excellent conditon - with remote

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We are presently operating on an APPOINTMENT ONLY basis. Please call us first at (617) 926-8020 to schedule an appointment before you come into the shop for repairs, rentals, product recommendations, consultations, or anything other than minor purchases.


Adcom GTP-400

Audio Proz Inv #: 42302

FM/AM tuner, phono, CD, tape 1/2. Balance bass and treble controls. Unit has full service, including all cleaning and FM tuner alignment. Minor scratches on cover, some finger wear on controls, missing 1 memory button. #8 condition.

$ 200  Contact Us  

Adcom GTP-450

Audio Proz Inv #: 70288

Excellent basic design, two tapes, 1 aux, no phono, excellent FM, presets. All clean/calibrated. with remote control.  #9 condition

$ 288  Contact Us  

Adcom GTP-450

Audio Proz Inv #: 70494

AM/FM tuner/preamp. 14 presets. Bass/Treble + Balance Controls. Inputs: CD, Tuner, Tape/Tape 2, Aux. External processor loop. 1/4" headphone jack. Remote control RC-45 included. FM aligned and glue removed. #8 Condition. Note: No phono input.  

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Adcom GTP-500 II

Audio Proz Inv #: 62179

AM/FM Preamp (Preamp with built in Tuner). NO REMOTE. 6 db gain change at output circuit. Low noise for headphone out. Used excellent condition, modified unit for better nicer range on volume control. #9 condition

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Adcom GTP-502

Audio Proz Inv #: 55213

Tuner/Preamp. CD/Tuner/Aux1/Aux2/Tape in,out/Ext Processor in,out inputs. High blend/ Countour/Bass/Treble/Balance controls. 18 Presets, AM/FM tuner. Black slimline unit with black face and digital display. Super audiophile design, extremely well built, rugged relays. Has manual and remote. Unit is virtually unused, like new condition. Condition #9+
Other similar units are available.
**We also do work on Adcom**

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ADCOM GTP-740 A/V Preamp & Tuner

Audio Proz Inv #: 72820

Comes with remote. RCA & S Video inputs include: DVD, Digital RF, Digital Aux, LD, VCR, Video Aux, CD, Tape, Tuner. NO PHONO INPUT. RCA outs include: Front, Rear, Center, Subwoofer.  Many Surround mode settings. 14 FM preset slots. High quality blue boards & Capacitors. Unit has many cool functions, it is recommended that interested customers research these functions online before purchase to see if this unit will fit their needs. Unit has seen very little use time, cosmetically excellent. Faceplate, covers, all controls and connectors are super clean with only minor signs of use (light surface scratching, wear/ staining from age and light use.) #9 Condition.

$ 325  Contact Us  


We offer expert time-saving advice on repairing many types of home and studio equipment, as well as consulting for product and recording issues, at a fair and reasonable cost.  For complex matters, we sometimes must charge a small technical fee.  If we can help solve your repair problem or technical conundrum, give us a call.  (617)926-8020.


Advent MPR-1

Audio Proz Inv #: 41990

Pre-amp with 2 1/4" inputs, 2 RCA outputs (male cable end, 10" long), 18 VDC RCA power cable, can use 2 stacked 9v batteries for PS. Includes 2 dynamic mics with long 25' cables, black, slick design. 1/4" splicing block installed on pre, can be removed upon request. Please inquire for more info.

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Amber Preamp Two

Audio Proz Inv #: 54864

This Amber Preamp Two is in excellent condition and along with being serviced by AudioPro, has also received upgraded IC chips to 5532 and mute circuits. The back panel connectors have also been resoldered. -TAPE/AUX/TUNER/PHONE/ -Subsonic/Ultrasonic/Tape Filters -Mono/Stereo Switch/ Mute Switch -Balance/Volume Controls -Blackface 2 Unit Rack -Upgraded IC chips to 5532 -Upgraded Mute Circuit -Resoldered Back Panel Connectors

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Amek System 9098

Audio Proz Inv #: 48664

High performance, solid state design, single channel, one rack space unit. Microphone preamp and equalizer can be used independently. All connections are balanced XLR. Excellent #9+ mint condition, includes manual, original box & packing.

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Ampex phono preamp 4010097-01

Audio Proz Inv #: 48142

Phono preamp with RIAA equalization. (This is a Mono Device) , Uses 8-pin socket connector. (1 only) Excellent #9 condition.

$ 38  Contact Us  

APT 201

Audio Proz Inv #: 52708

100 ohm input impedance, tested good, no mods

$ 100  Contact Us  

APT 202A

Audio Proz Inv #: 45886

Moving coil preamp. 75ohm input impedance. Super low noise top board. Serviced and fully tested, with some capacitor updates. Excellent #9 condition.

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FYI, Around the database you will often see us describe the condition of units on a scale of 1-10. #10 would mean the product is new from one of our suppliers, such as Behringer, Audio Technica, etc. #9 means the product is in perfect condition but is used, #8 implies there are some minor cosmetic scratches but unit is mechanically perfect, and so on and so forth.


APT 202C

Audio Proz Inv #: 52699

super low input with super low noise board, tested, may need cap update soon, condition #9

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APT Holman 1

Audio Proz Inv #: 71751

 PRE Pre-Amp board, phono, 201A board, medium gain version, not updated but works, must be adjusted for specific input impedance, 9 Condition

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Apt Holman 2014

Audio Proz Inv #: 61507

Mc pre-amp board. Complete. Good condition. Tested and working. Has original caps. #9

$ 148  Contact Us  

APT Holman Moving Coil Phono Preamp

Audio Proz Inv #: 61575

Set for 100 ohm impedance, but can be changed per customer request. (15db gain modified).  All caps updated / recapped, noise check, EQ check.OK #9 condition

$ 240  Contact Us  

APT Holman Pre Amp

Audio Proz Inv #: 72905

Pristine cosmetics and fully functional, Audio Pro Modified level III, capacitor updates throughout all boards, relay replaced, upgraded -super clean operation, All controls and switches multistage cleaning, soldering ruggedized throughout especially any connectors and grounds. Ground mods completed, eliminate any low level buzz or DC bleed. Full calibration and mods level III, Excellent cosmetics only light scratches on top cover. #9 condition

$ 988  Contact Us  

Apt Holman Pre Amp Modified Level III

Audio Proz Inv #: 63530

Top Quality Hi accuracy, very well built product. Complete service , clean and calibration. Inputs: Phono 1 and 2 , tuner, Aux1 and 2, Tape 1 and 2   (Dubbing 1>2  2>1) Level 3 modification by AP.  See description herehttps://www.audioproz.com/AP.php?Article=95   #8+ condition Minor scuff on face panel.

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Customers outside of the US, please note that international shipping can be costly (US Post $16 minimum - up to 8oz or 226g). We are glad to combine orders to reduce shipping costs. Take a look at our shipping policies for more information and estimates of prices and shipping time.


APT Holman Preamp

Audio Proz Inv #: 71582

Original version, really nice lightly stropped gray face coloring with light gray purple knobs, nice look with rare and interesting version of cosmetics but still has the look of APT coloring, All Level III Audio Pro Mods, phono update, headphone mod, all audio cap all PS caps, Relay mod, Image control mod, EQ mod, Tone control mod, #9 Condition

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Apt Holman Preamp

Audio Proz Inv #: 71851

High Quality Reference standard pre-amplifier byTom Holman.  This is a stunning looking preamp with a new black pebble face panel and grey knobs- very sharp and Vinces favored look! .  Complete Level III modification which includes : All power supply caps upgraded, Audio caps upgraded, relay updated, headphone amp FET spec. All modification to Phono, EQ, Tone control circuits as well as infra filter. Excellent condition #9 

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