Audio Proz Service and Sales


Bryston 1B

Audio Proz Inv #: 943207

Make an offer. In: Tape1/Tape2/Aux/Tuner/Phono 1 and 2. Ruggedized and fixed AC wiring. Complete, intact, working unit. Cleaned controls with AG cleaner. All channels calibrate +- 1db, with a 88db noise floor. Cleaned corrosion on board, fuse, and connectors. 220 Volt operation. #8- condition

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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  

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  

Yamaha PG1

Audio Proz Inv #: 72736

Full feature unit with effect send levels IN/OUT Guitar Preamp with Guitar distortion, multiband EQ, 2 channel switching, double spring reverb, (modified to make rugged and dampened spring pan for cleaner brighter spring sound, nice shorter delay / decay spring). Original spring pan. 1/4"  & XLR outs. #8+ condition

$ 360  Contact Us  

Marantz Model 3200 Stereo Control Console

Audio Proz Inv #: 72678

Headphone out, hi-filter, montor source/ tape, left/right balance slider, bass/ mid/ treble sliders, loudness, tone mode selection. Beautiful unit in excellent functional and cosmetic quality. Better version electronics (tantlum caps). Clean face with minor signs of use. Aftermarket feet installed on bottom. #8+ Condition

SOLD  Contact Us  

Contact us about similar items or replacement parts.


We leave "SOLD" items on our website for machines that we often repair and provide parts for. This is to give you an idea of the products we typically carry, and direct you to alternatives you may not know about - we often have substitutes for out-of-stock parts, and are happy to recommend workarounds and different solutions to common problems.


Apt Holman Preamp

Audio Proz Inv #: 72666

Audio Pro Modified Level III, Nice low use unit , Ground mods, tone control mods, headphone amp mod, All necessary capacitors replace & phono filter, Relay cleaned & tested, RFI mods. Only minor wear on face and top cover #9- condition

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Krell KRC-3 Stereo Preamp

Audio Proz Inv #: 72609

(1) Stereo Balanced XLR, (2) Stereo Line Inputs, (1) Stereo Line/processor, (1) Stereo Line/tape, (1) Tape out RCA's L/R  Main Outputs RCS and XLR, Super Quality, NO REMOTE / NO PHONO, with photocopy of owners manual, Condition #9

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Carver CT-24 Preamplifier Tuner

Audio Proz Inv #: 72286

Black face/rack mount, digital AM/FM 10 presets, excellent tuner, use of head phone jack stops audio output by design, FM battery memory OK, re-soldered power supply board and minor service updates, cleaned and calibrated, cleaned all connectors, 1 Phono, 3 Line-ins, 3 Tape loops, NO REMOTE, Condition #8+

$ 268  Contact Us  

Marantz 3200

Audio Proz Inv #: 72101

Vintage preamp, silver face with black inset, bass / mid / treble controls with turnover 250hz 4kHz, phono 1 / 2, tape 1/ 2, tuner, aux inputs, *back panel RCA's have been replaced (metal plate was cut to fit new RCAs), fully serviced, excellent condition, all basic service, condition #9

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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 

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Apt Holman Preamp

Audio Proz Inv #: 71840

Complete level III update, Rack face, no handle. Minor bends and dents at one rack hole. Slight bend at each side. Flat matte black face. Lettering is perfect. . SN: 2527, but has later version boards. Unit can have another face installed, call. Condition #9.  See about Level III mods here. https://www.audioproz.com/AP.php?Article=95

SOLD  Contact Us  

Contact us about similar items or replacement parts.


Need an APT unit serviced or modified? Vince, the owner of Audio Pro, ran the production line at APT for many years, and has decades of experience working with APT products. Read all about our APT Holman service and mods here. Also read about the APT Moving Coil Phono Mod Here.


Dynaco PAT 5

Audio Proz Inv #: 71763

Light Gold/Silver Faceplate, Back panel RCA perfect, low phono noise level excellent, Absolute mint condition original, no mods, low use, Excellent quality Assembly, #9 Condition

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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

Contact Us  Contact Us  

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

SOLD  Contact Us  

Contact us about similar items or replacement parts.

NAD 114

Audio Proz Inv #: 71510

Stereo preamplifier - Gray with black knobs - Slim unit. Inputs: 2 tape (1+2) Tuner, Aux, Video, CD, Phono (MM)  Outputs: 2 Preouts and Headphone (1/4" Jack). When headphones are plugged in, Pre outs are muted -Nice feature! Very nice quality basic preamp with good phone stage.  Low use #9 condition

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Apt Holman Preamp 2

Audio Proz Inv #: 71499

Serial number J81E223. Level III mod, upgraded: all P.S. caps, all audio caps, headphone op amp, phono EQ circuit. AP correctly updated unit. Condition 9

SOLD  Contact Us  

Contact us about similar items or replacement parts.

B&K PT3 Series II Tuner Preamp

Audio Proz Inv #: 71220

5 line inputs, (no phono) with original remote control, (face plate lettering is dim)  Be careful in sleep mode (button), powered on unit may look to be off ! # 7 condition.

$ 118  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.


Rotel RQ-970 BX Phono Pre

Audio Proz Inv #: 71215

MM & MC inputs, Simple slimline design using super low noise AD744 OP amp. about 6db of gain extra for MC.  Audiophile grade components. Bench test QC, all OK. #9 condition 

$ 188  Contact Us  

ART USB phono plus

Audio Proz Inv #: 71196

Hi Quality Phono pre and computer I/O, Line / phono input select. 1/8" headphone monitor with level adjust. RCA ,s/pdif & optical connections. USB or extermal power power supply (includes USB cable but not external supply-thoes can be purchased seperately) 

$ 118  Contact Us  

Nikko Beta 20

Audio Proz Inv #: 70940

Pre-amp is audiophile grade. 19" Rack mount. Black w/ white lettering. 1 Rack unit. Input: Tape 1, Tape 2, Aux, Tuner, Phono 1 + 2, (Phono switch mm or mc) Super quality class A FET design. Serviced, caps replaced on turn circuit and tested. Good condition. 3 scratches top edge of face panel. (can be touched up) #9 condition.  

$ 348  Contact Us  

NAD C162

Audio Proz Inv #: 70757

Fancy high preamp. Class A module design. Slimline design. Bass/treble controls. MM, MC input. Headphone out. Unit does indeed have little more clarity in over all design (subtle). Some power supply upgrades of crucial resistor and rugged resoldering. #9 condition.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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.  

SOLD  Contact Us  

Contact us about similar items or replacement parts.

MCM Model 40-630 Solid State Stereo Phono Pre-amplifier

Audio Proz Inv #: 70434

Basic phono preamp, 1 stereo input, 1 stereo output, Black case (4"x2.5"x1.5"), Good condition (#9)

$ 14  Contact Us  


Need an APT unit serviced or modified? Vince, the owner of Audio Pro, ran the production line at APT for many years, and has decades of experience working with APT products. Read all about our APT Holman service and mods here. Also read about the APT Moving Coil Phono Mod Here.


Luxman 5C50

Audio Proz Inv #: 70414

Super Quality Preamp, Much class  circuit design, (2) new upgrade quasi op amp circuit for phono section. (2) other modules (original) have been opened and re-soldered mini circuit board, double up on Mylar preamp coupling caps. Excellent Noise Floor, MC transformer installed type 8020 40ohm load. Most caps replaced in power supply (small value types) All calibrations done for preamp module D.C. offset, new status bulbs. case and cover has few minor scuffs, Face is #9 Very low use machine #8+ condition

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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