Audio Proz Service and Sales

8" AR Guitar Driver

Audio Proz Inv #: 25737

Accordion surround, large square magnet, extra harmonic content. Acoustic Research speaker converted to guitar driver.

$ 30  Contact Us  

ADA Continuous Control Pedal

Audio Proz Inv #: 40949

Continuous Controller Pedal for MXC controller going into MP-2. Excellent Condition.

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ADA Digitizer 4

Audio Proz Inv #: 41310

Programable delay. 1 space rack. #8 cosmetics. Modified to be lower noise floor, warmer echo and regeneration (more of the analog type sound. Call for details if interested.

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Audio Proz Inv #: 36464

5 button foot control pedal for ADA units. Memory/Bypass, Flanger, Chorus, Echo/Hold, Repeat. LED's for each button. For ADA 2FX. Comes with cable, low use at owner's home studio. Good (#7) Condition.

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ADA MB-1 AC transformer B507-E

Audio Proz Inv #: 51652

120vAC transformer for ADA MB-1. 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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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  


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  


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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Audio Proz Inv #: 53403

Unit has REV6 modifications. Engineering sample. Better Overdrive/ Tube EQ ETC. SN:807518. Super quiet. Replace jacks with high quality phone jacks. #8 condition.

$ 580  Contact Us  

Customers outside of the US, please note that international shipping can be costly ($14-16 minimum for anything larger than an envelope). Take a look at our shipping policies for more information and estimates of prices and shipping time.

ADA Pedal Kit for MP2

Audio Proz Inv #: 20479

MXC 10 button midi foot switcher, ADA "quad switch" controller, 20ft midi w/phantom power cable

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ADA Quad Switch

Audio Proz Inv #: 40948

Midi Continuous Controller switch for use with ADA MXC

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Audio Proz Inv #: 48300

Single rack space, classic four effect, all analog delay/flanger machine. Includes foot control and remote cable. Modified with added switch to allow blending of chorus or flange with the echo in a nice, subtle way. #7 cosmetic condition with evidence of road use, obvious bent edges, rusty spots on pedal, but all internal mechanics and electronics cleaned and/or replaced, professionally serviced and tested. Sounds beautiful!

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AMP 420 Bass Amp

Audio Proz Inv #: 14728


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ART 410 Power Plant

Audio Proz Inv #: 48402

Very sophisticated, all analog circuit. Quiet EQ and gain, even quieter preamp. Has a thicker, warmer tone quality even in overdrive, but we have modified it to allow more edge and clarity of extreme highs to pass through slightly "silvery" sounding. Tone control of highs will be more effective to darken or brighten guitar. Unit has effect send, XLR out, headphone out, and input for optional channel switching pedal. Like new condition, all cleaned, calibrated, and serviced.

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Ashly IBP41

Audio Proz Inv #: 14562

Single Rack Space Bass Preamp with 2 way crossover out, stage out, and balanced direct/line out. Parametric and 3 fixed EQ. 2 Ch switchable input and headphone out. Professionally cleaned and serviced and modified to be more rugged--call for details. Excellent condition.

$ 200  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.

Audio Technica Uni-Pac guitar adapter

Audio Proz Inv #: 42717

For ATW1031 series. Allows you to transmit guitar through wireless microphone unit.

$ 20  Contact Us  

BBE 381

Audio Proz Inv #: 42119

2 channels (clean and distorted), BBE Process control, unit is fully cleaned and serviced, #9 condition

$ 160  Contact Us  

Behringer Bass V-Amp

Audio Proz Inv #: 45016

New stock.

$ 108  Contact Us  

Behringer Bass V-Amp Pro

Audio Proz Inv #: 43996

Rackmount bass preamp processor.

$ 170  Contact Us  

Behringer Bass V-Amp Pro

Audio Proz Inv #: 44212

2 space rack design. 32 amp models, 23 cabinet models, 16 effects (analog and digital). 1/4" headphone out.

$ 170  Contact Us  

Behringer DD-100 Digital Delay

Audio Proz Inv #: 38975

Digital delay line foot pedal (V)

$ 28  Contact Us  

We keep our database up to date with almost 10,000 items in stock. If you see a part number and a price, we have that item in stock.

Behringer FCV-100

Audio Proz Inv #: 39644

For foot control of volume or modulation. New in box.

$ 26  Contact Us  

Behringer FX600

Audio Proz Inv #: 53697

Digital Multi-FX pedal. Flanger, Chorus, Phase, Delay, Tremolo, Pitch shifter. 1 time demo. New. 10 condition

$ 48  Contact Us