Audio Proz Service and Sales


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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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 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 (possibly sold unit see our other listings)

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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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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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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.


ADA 2FX Digital Multi-Effects Faceplate (only)

Audio Proz Inv #: 72785

Some damage & wear. Needs cleaning. Definite signs of use but not overly damaged or worn. Condition 8

$ 24  Contact Us  

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  

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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