Audio Proz Service and Sales


Electro Harmonix - Octave Multiplexer

Audio Proz Inv #: 90092

One Octave Bass tone generator. Two separate smoothing filters enable you to tailor your sub-octave signal to the exact bass sound you desire. Controls: High Filter, Blend, Bass Filter, Range Switch, Bypass. New in Box.

$ 75  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  

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.

Not For Sale  Contact Us  

Contact us about similar items or replacement parts.

Dean M10 Guitar Practice Amp

Audio Proz Inv #: 71757

Boost Switch, Phone Jack, #9 Condition

$ 48  Contact Us  

Line 6 Spider III

Audio Proz Inv #: 71736

15 watt, 8 inch driver, has very simple but very nice chorus, tremolo, reverb, tape echo effect, 2 effects at a time, compact 14 inch high cabinet, low use, basic service done, #8+ Condition (CALL FIRST)

$ 158  Contact Us  


All Remotes are now 25% off or Free Shipping!!!  (Reel to Reel remotes excluded).


Ibanez Tone Blaster Model TB50R

Audio Proz Inv #: 71514

External speaker out. FX loop. 2 footswitch controls. 55W. Spring reverb. Clean & overdrive w/ bass, mid, treble EQs. Warmer sound character, but has nice EQ and overdrive. Virtually no use. Condition 9

$ 188  Contact Us  

Hartke LH500 Bass Amp

Audio Proz Inv #: 64300

500 watt peak power, excellent super rugged construction, 3 band eq (special switchable eq curves), tube front end pre and limiter circuit, 2 rack space, 8+ condition.

$ 360  Contact Us  

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 

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Yamaha G50 112II

Audio Proz Inv #: 63046

Guitar amplifier, w/distortion control mods, spring reverb, 3 band EQ, 2 ch, foot pedal (reverb, ch, EQ) Amp  comes with vinyl cover(Black)  Cleaned and serviced. Unit plays loud, Jazz tone, high quality and bright sounding! #9 Very Nice condition 

$ 285  Contact Us  

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

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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

SOLD  Contact Us  

Contact us about similar items or replacement parts.


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


Crate Stealth-50 GT-50

Audio Proz Inv #: 60360

With 16ohm Clestion Vintage 30 speaker, impedance speaker matching switch gives different tone qualities. Spring reverb. 4 6V6 Amplifier, excellent, 4 new Sovtek 6V6 tubes installed, 2 channel IN, multiband EQ, FX send loop, footswitch. 8/10 condition cleaned, calibrated, major super-ruggedization, doubled upon grounds, tested reverb/speaker. new fuse holder.

$ 348  Contact Us  

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.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Electro Harmonix Bad Stone

Audio Proz Inv #: 58447

Phase Shifter Pedal

$ 68  Contact Us  

Electro Harmonix Ring Thing

Audio Proz Inv #: 58446

Single sideband modulator

$ 188  Contact Us  


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


Electro Harmonix B-9 Organ Machine

Audio Proz Inv #: 58429

Awesome foot pedal that makes guitar sound like a B-9 organ. Give a call.

$ 188  Contact Us  

Rocktron Rampage R10 Amp

Audio Proz Inv #: 57679

10 watts, 6" speaker. Unit has low use time. Features headphone jack and overdrive effect; overdrive has been modified to be less aggressive with lower noise. Condition: 9

$ 48  Contact Us  

Hopper Pedals

Audio Proz Inv #: 56739

Features 1 single in/out, but allows punch in/off. 1 or 2 effects loops (2 send and returns). Small, well built cast metal box. Does not come with a power supply, but the battery only runs the LED. Condition: 9

$ 48  Contact Us  

Fender Princeton Chorus

Audio Proz Inv #: 56545

2 channel solid state amp. Channel 1 controls: Volume/Mid/Treble/Bass/Reverb; Channel 2 controls: Gain/Limiter/Presence/Volume. Features Chorus effect with rate and depth controls, and Mono/Stereo effects loops. Has original 2x10 drivers.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Crate Taxi TX-30

Audio Proz Inv #: 55897

Battery powered combo amp. 2 inputs/2 channels- ch1 level/ tone controls ch2 gain/low/mid/high/level controls, 1/4 inch insert/phones jack. Brand new battery. Has charger. Can also run off 12 volt power supply. AP dampened cabinet, nicer sound, Audio Pro Modified for more natural sound, but forward voice, Upgrade speaker supplied upon request.. 8" driver 2" tweeter. Unit has seen low use time, all Tolex covers are nice. 9 condition

$ 288  Contact Us  

Behringer VB-1

Audio Proz Inv #: 55688

Vintage bass foot pedal. Dual dynamic filter.

$ 50  Contact Us  


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


Gorilla GG-20 Plus mini-guitar amp

Audio Proz Inv #: 54654

Gorilla GG-20 mini-guitar Amp -Speaker replaced with high quality 3-way driver -12VDC optional Power Supply (can run on battery) -#8+ condition minor scuffs

$ 100  Contact Us  

Maxi-Mouse 1/4" input jack part

Audio Proz Inv #: 54089

9 terminal switching 1/4" jack for input, closed frame design. Rare part. Actually 3 versions exist. (show us a picture of yours for us to match). Some creative thinking may be needed to adapt wiring or nut mounting. This is the only solution. Used part. Looks good. (1) Board mount version, sits flat on board, 9 legs available for $16. Condition 8/10.

$ 14  Contact Us