Audio Proz Service and Sales


ADA MP1

Audio Proz Inv #: 42090

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

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Boss ME-10

Audio Proz Inv #: 27927

Guitar Multiple Effects (compressor, overdrive/distortion, noise suppression, EQ, Phaser, Flanger, Pitch Shifter, Delay, Stereo Chorus, Stereo Reverb, Effect Loop, Tuner, Midi in/out). Functionally tested OK. Excellent cosmetic and mechanical condition.

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Washburn OB100N

Audio Proz Inv #: 32469

Acoustic Bass with soft case.

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Yamaha PB1

Audio Proz Inv #: 24610

bass pre

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Roland GK-1 Synthesizer Driver

Audio Proz Inv #: 18388

Synthesizer Pickup

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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 V-Amp

Audio Proz Inv #: 36819

Guitar Multi-Effect Processor

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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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Ibanez AD202 Analog Delay

Audio Proz Inv #: 45143

Dual channel delay unit. Channel 1 and 2 level control, tone control, mode select, delay time, speed, width, regeneration, blend controls. Very good #8 condition with some minor marks. Very low mileage, professionally cleaned and serviced.

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Zoom 606

Audio Proz Inv #: 39258

Multi effects processor for guitar. 35 effects (9 at once), 42 programs, expression pedal.

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Marlboro Guitar/Bass Amplifier #520B

Audio Proz Inv #: 27914

15"inch driver, inputs: bass/guitar/flat. Controls: volume/bass/treble. Modified power supply switch. (3x) ruggedized board, power on indicator lamp, tolex (black) with metal corners. Unit has been double checked.

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Behringer GX-112 Blue Devil

Audio Proz Inv #: 36068

Guitar Combo Amp, 60 Watts, onboard effects - Reverb, Delay, Phaser, Chorus, Flanger, Pitch Shifter, Speaker Simulator, etc.

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Need your guitar or bass amp tuned up? We have always serviced tube and solid state amps. We now have a new technician especially dedicated to repairs, upgrades, and modifications to all types of guitar amps. Orange, Mesa Boogie, Fender, Marshall, Hughes and Kettner, Peavey, Ampeg, Gibson, Silvertone, etc. Read more about it here


ADA TFX4

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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Tech 21 NYC Killer Wail

Audio Proz Inv #: 48414

Chrome and nickel plated wah pedal, mint condition.

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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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Lectrosonics Maxi Mouse various parts

Audio Proz Inv #: 48560

R1379229 dual 100k control $16, R1379238 10k control $8, 3-position switch $6, amp IC TDA2002 $6. Other parts may be available.

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Crate GX-15 Amp

Audio Proz Inv #: 60311

Headphone jack, external 1/4" speaker jack. Overdrive channel. 6", 4 ohm SCM Electronics Speaker. Great practice amp, good condition, all knobs intact. A few minor dings, dents in the cabinet tolex. Tested. Nice. Condition 9.

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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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Peavey Classic 20

Audio Proz Inv #: 58718

8" Speaker. All tube design. Unit has an easy to overdrive sound character. Tweed cover/skin. Nice for solo lead guitar! 8/10 condition overall. Circuitry in #9 condition. Tweed in #7 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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Beringer Ultra Bass BX1800

Audio Proz Inv #: 61564

180 watt bass workstation, DX loop headphones jack, CD in RCA inputs, -6 db pad switch, 15" speaker with piezo tweeter in excellent condition, unit has some wear, marks, scuffs on tolex, few small tears, grill cloth in great shape, new power switch installed, interior is clean, sounds good, versatile amp, 7+ condition

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Dean Markley K-20BX

Audio Proz Inv #: 61548

gain, low mid, high mid, bass, treble, 1 × 8" Dean Markley vintage rock design speaker, cute little practice amp, good condition, few very minor marks, headphone jack currently does not null out speaker (would require rewiring), great student/practice model!, #8 condition

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GK MB 115

Audio Proz Inv #: 63935

Bass Combo Amp. Passive/Active 1/4" inputs. Bass, Treble, Hi Mid, Low Mid controls (level). Cabinet has been dampened to improve Bass + smoothness of bass quality. Output: Master control + Boost, Limiter on/off, Horn on/off. Original woofer and Horn sweep tested, all OK. Aux in 1/8", Direct out XLR & headphone out 1/4". Nice sturdy but lightweight textured cabinet, with NEW G&K 200 watt, AMP MODULE INSTALLED #9 condition 

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ADA MP-1

Audio Proz Inv #: 72125

Guitar Processor. Unit has Rev 6/ Rev 5 Modifications. Engineering Sample. Better Overdrive/ Tube EQ etc. Back panel phone jack is for line level. Unit has high/ low output switch on top cover. Fair amount of rack rash and scratches. Fully functional unit with only some minor cosmetic flaws. #8- Condition


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.

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