Audio Proz Service and Sales


3BX remote

Audio Proz Inv #: 40783

Add on remote for older version 3bx adds release of expansion, and fade of volume down 20 foor cable like new in box. If you are having trouble finding parts enter the name into search bar

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ACT 8 channel

Audio Proz Inv #: 18609

Balancing 8 channel bay, active op-amp, -10 to +14 dBm, phone to XLR, front panel clip lights, very quiet, well-built, ruggedly constructed

$ 130  Contact Us  

ADA MP1

Audio Proz Inv #: 17208

Guitar Preamp, input replaced with rugged jack and level control, Unit is Rev 5 low noise modified tube/solid st. RFI modified ground mods tube front end modified to be truly warmer and thicker overdrive and solid state circuits have been more evenly matched. Slightly worn cosmetics, input replaced with rugged jack and level control.

On my website is a clear explanation about ADA MP1 and mods. Without a doubt the 3 tube mod is a waste of time and money and actually will make the ADA MP1 run incorrectly. This unit operates on the principal that the FETs control the tube voltage and carefully inject distortions into the cathode of the tube and also, the programming on the front panel changes plate voltages to tubes! A remarkably clever design! Obviously, the people who offer this 3 tube mod and double transformer mod do not understand this circuit or its operations technology and they are misleading concerned players.

The modification that I do actually lessens the tube gain, lowers the noise floor, and adds equalization that is better for todays vintage sound. Players want more versatility in programming usual guitar overdrive effects. The original design is way too screechy metal in its overdriven character for too many programs. My alteration allows a wider range of programming to go from the metal to warm, driven to crank, to a bluesy overdrive whereby the overdrive and equalization controls are calibrated more in the middle range of its programming numbers; i.e. Number 5 on the overdrive is now a nicely driven sound rather than a badly overdriven sound but the ADA MP1 will be still be able to be heavily overdriven on an 8 or 9 setting. These modifications were acceptable to the ADA engineer at the time. In fact, he commented that the electro acoustic sound with my parts change was similar to his thinking too, in that it allows for more flexibility for front panel adjustment for even more guitar tube preamping effects.

I have done this mod for 25 years!! No complaints yet. Please call me directly for more info.

$ 480  Contact Us  

ADA MP1

Audio Proz Inv #: 42090

Tube Guitar Preamp. Version 2.00. This unit is in brand new condition in box, with manual. Mods are available, call for details.

$ 480  Contact Us  

ADA MP1 Tube Preamp (Rev 6)

Audio Proz Inv #: 40272

#8+ Condition, Excellent Audio, No rack Scratches, New Front Jack, Tube EQ Mod, Battery LED Mod, Battery Supply Mod, Audio Circuit Low Noise, 5534 op amp mod, upgrade k246 FET, super low noise mod. very rugged front panel jack, jack only works as guitar input, #8 condition, excellent audio, no rack scratches

$ 540  Contact Us  


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.


ADA MP2

Audio Proz Inv #: 40484

Midi Tube guitar Preamp, update noise gate/effects loop, good cosmetic condition (minor chassis scratches on top), excellent mechanical, virtually no running time (#8 overall condition), Update - noise gate, later power supply version. Stereo effects, tremelo, chorus. XLR out.

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ADA PitchTraq

Audio Proz Inv #: 14220

Programmable pitch transposer, 1 rack mount space, good cosmetics, fully programmable touch button pitch transposer with 16 (4x4) memory banks, matte surface membrane panel, rear I/O and special functions, 1/4" phone jacks

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ADC DD-4AX Stereo Digital Delay

Audio Proz Inv #: 57398

Stereo delay and reverb with 20 watts per channel. 1 rack space, DBX company design. Tested, low use, serviced and cleaned switches. Condition: 9

$ 125  Contact Us  

ADC VSS-2

Audio Proz Inv #: 11581

Video processor/router, has I/O for 3 VCRs, does Audio/Video fades, full functional check OK, cleaned and QC.

$ 175  Contact Us  

Akai SS-V10 Cable Switcher Patch

Audio Proz Inv #: 57242

10 input audio switcher with remote control of inputs, front audio ins (unit will switch archaic video coax). Value of the machine is in the high quality audio selector memory to remember level matching. Low use, minor scuffs on top. Condition: 8+

$ 120  Contact Us  

Alto Verb II

Audio Proz Inv #: 41501

NEW. 40 bit digital Efx. 256 Stereo Effects. 16 Programs. Bariable 1/o gain. Stereo/mono 1/4 inputs. Demo oempty.

$ 88  Contact Us  


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.


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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Antares ATR-1 Auto Tune

Audio Proz Inv #: 43336

Mint condition unit with low hours of use. Front Panel Features: Screen, big dial, cursor L+R, programs, page, system, + bypass. Rear Panel Features: Balanced XLR + 1/4" ins, Midi in. Balanced XLR, unbalanced 1/4" outs, footswitch 1/4", ground selector (circuit board + chassis). Comes with owner's manual. Very nice performing machine!

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Antares ATR-1a

Audio Proz Inv #: 42392

Autotune Processor. Jog dial, LCD display. #9 condition, with manual. Very popular model with studios.

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Apex compellor model 301

Audio Proz Inv #: 27744

Excellent front panel cosmetics!! manual included. Meter selection- input/output, gain reduction/program, input gain, process balance,output gain, silence gate threshold, bypass. XLR in/out, 1/4" leveling tie input. Mono only unit!!! full rack space.

$ 150  Contact Us  

Aphex 103A Aural Exciter Type C

Audio Proz Inv #: 14989

Different version than most Type C, Has much better drive circuit and 5534 opamp circuits! Nicer sounding and more sophisticated entrance circuitry quieter operation, wider range on frequency tuner.

$ 180  Contact Us  

Aphex 106

Audio Proz Inv #: 26497

4 channel compressor, GAIN RANGING COMPRESSOR

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We have been selling and repairing professional and consumer audio equipment for over 40 years. (Read some of our customers testimonials here)


Aphex Aural Exciter Type B

Audio Proz Inv #: 45088

Two channels, with Drive, Tone, Mix controls. 1/4" in/out, 0 or -10dB selectable. Very good #8+ condition.

$ 88  Contact Us  

Aphex Aural Exciter Type B Model 102

Audio Proz Inv #: 14226

1 rack space, 2 channel drive/tune/mix controls, 1/4" phone jacks for rear I/O

$ 220  Contact Us  

Aphex Aural Exciter Type C

Audio Proz Inv #: 8318

1 rack space, drive/tune/mix controls, 1/4" phone jacks for rear I/O.

$ 90  Contact Us  

Aphex Aural Exciter Type C

Audio Proz Inv #: 53179

Original. #9 condition, ruggedized inputs and outputs solder points.

$ 66  Contact Us  

Aphex Aural Exciter Type C

Audio Proz Inv #: 50891

Stereo processor. Adjustable drive, tune, and mix. RCA and phone in/out. Excellent condition with very minor rack wear.

$ 68  Contact Us  

Aphex Aural Exciter Type E

Audio Proz Inv #: 17882

With manual, Hi-Z input 1/4" phone, Drive/Tune/Mix controls, 1/4" phone I/O, footswitch

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If you are having trouble finding parts, enter the name into our search bar at the top of the page. Please be aware there is a minimum $4-$6 to ship any part. International orders will be $14-$16 to ship for anything larger than an envelope. Shipping costs are non negotiable, so please, PLEASE do not ask for a part, or for us to search for, or quantify a part if you cannot pay for the shipping.


Aphex Compellor

Audio Proz Inv #: 42833

AHX5002 (aka model Ax, Model 300). Completely tested and cleaned. Low use hours. Multi-band dynamic enhancement compressor. The best! #9 condition.

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Aphex Nova Systems Version

Audio Proz Inv #: 23985

Small half space rack unit. Modified by AudioPro- now with a lower noise power supply and a more subtle and musical sounding second order harmonic distortion circuit. Very nice for giving a "tube edge" to analog sound. Unit does second harmonic distortion, adding harmonies to presence frequencies. RCA ins/outs. Can do semi-pro +4dB.

$ 180  Contact Us