Audio Proz Service and Sales


Art Pro MPA with Rev6 Mod

Audio Proz Inv #: 71596

Had 10dB higher gain preamp. Full audio pro rev 6 modification. Has T.H.E. tube harmonic equalizer circuit. Updated mic pre with RFI suppression. Updated tube plate volts. Updated low frequency EQ predominance. Phase corrected filter. (No loss of extreme deep bass) Has complete mod of tube vactrol auto compression and EQ at 0 dB. SN 4930. Has box. Condition #9

$ 888  Contact Us  

Bellari RP533

Audio Proz Inv #: 60665

Modified with transformer, Automatic EQ compressor. This design allows deep bass and impulse response to be enhanced and less high frequency attenuation and clarity enhancement circuit. Unit has a ground modification and capacitor update for 6db noise floor improvement. This version has a 4560 op amp upgrade for line out balanced out. Mic pre amp RFI suppression capacitor. Modified with first stage tube harmonic bias control (right control) Cleaned switch with silver paste. #9 condition

$ 800  Contact Us  

ART Pro Channel

Audio Proz Inv #: 48537

Tube mic preamp/compressor/equalizer. AUDIO PRO MODIFIED: Tube Harmonic T.H.E. Bias control transformer in Vactrol EQ Mod. Highly recommended, Super noise spec machine!  QC, Test All. #10 new in box

$ 568  Contact Us  

Art Pro Channel

Audio Proz Inv #: 54689

Modified vactrol variable transformer dynamic EQ, and variable tube bias mod. Professional tube microphone pre-amplifier. Tube/optical compressor. +48V phantom power supply. With true "tube gain cell" compressor. B stock.  See more details about the mod here, https://www.audioproz.com/AP.php?Article=19&Tab=Modifications

$ 548  Contact Us  

Bellari RP533

Audio Proz Inv #: 50898

Studio tube compressor/limiter preamp. AudioPro modifications to optimize tube gain and noise, power supply updates, phase switch pad and hi gain switch added on front panel. Excellent #9 condition.

$ 520  Contact Us  


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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. 

Customers outside of the US, please note that international shipping can be costly (US Post $16 minimum - up to 8oz or 226g). We are glad to combine orders to reduce shipping costs. Take a look at our shipping policies for more information and estimates of prices and shipping time.


ART Tube Channel Model 259

Audio Proz Inv #: 56801

Mic pre with compressors and parametric EQ. Tubes: RCA vintage 12AT7, Sovtek 12AX7. Selected tubes for higher tube character, real nice 12% distortion. Like new demo unit with clean controls, resolder ruggedized board, no rack rash, and original operator's manual. Condition: 9

$ 460  Contact Us  

Bellari RP520

Audio Proz Inv #: 30179

Tube Mic Pre, Gold Face, VU meters

$ 430  Contact Us  

ART Pro Channel II

Audio Proz Inv #: 56014

Class A mic preamp. Tube Preamp, compressor, eq. Super spec unit. Special upgrade. Updated power supply to run any type tube, new, old etc. Unit can run on 90 VAC line current. Special bypass capacitors on power supply. New in box, QC - low noise spec.

$ 388  Contact Us  

Tascam MX-80 Mic Mixer

Audio Proz Inv #: 22246

8 channel mic preamp, add on 48v power, extremely high gain low noise full bandwidth mic pre, 2 space rack unit, excellent conditon

$ 360  Contact Us  

ART Digital MPA II

Audio Proz Inv #: 54241

Two Channel Tube Mic Preamp with digital outs. XLR I/O, 1/4 inch output. AES/EBU, SPDIF, ADAT, Optical outputs. Word Clock in/thru. Sample rate control. MS Matrix. Variable input impedence. Minor rack rash.

$ 360  Contact Us  

ART Digital MPA II

Audio Proz Inv #: 54242

Two Channel Tube Mic Preamp with digital outs. XLR I/O, 1/4 inch output. AES/EBU, SPDIF, ADAT, Optical outputs. Word Clock in/thru. Sample rate control. MS Matrix. Variable input impedence. Minor rack rash.

$ 360  Contact Us  


Need your guitar or bass amp tuned up? We are now doing 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


Art Pro Channel II

Audio Proz Inv #: 59878

Single channel mic pre EQ compressor. SN:S150861225. New

$ 348  Contact Us  

Art Pro Channel Model 215

Audio Proz Inv #: 71285

Like new. All QC checked by Audio Pro. Low noise tubes. In box with manual. #9 condition.

$ 348  Contact Us  

ART PRO MPA II

Audio Proz Inv #: 57640

Two channel Mic/HiZ. M/S Matrix. Variable input Impedance. Variable plate voltage. QC- Lubed, Burn-in, switches exercised. #10 Condition (New).

$ 328  Contact Us  

Presonus Eureka

Audio Proz Inv #: 57492

Transformer coupled class A preamplifier. Variable input / instrument input, compressor, parametric EQ. Very low use, minor rack rash. Can be updated to remove SMD caps + replaced with better caps input/output balancing line caps.

$ 300  Contact Us  

ART MPA gold mic pre

Audio Proz Inv #: 39767

sw: MO70103917. Sale

$ 300  Contact Us  

Tascam MX80 cahnnel Mic Preamp

Audio Proz Inv #: 63831

Add on 48 volt, some codes are color blue. Rental Unit excellent serious low noise class A preamp design. #8 condition. 

$ 300  Contact Us  



ART Pro MPAII

Audio Proz Inv #: 49288

Two channel tube mic preamplifier. New. Highly recommended product!

$ 288  Contact Us  

DBX 386

Audio Proz Inv #: 43676

Dual vacuum tube preamplifier. 2 channels, each with 1/4" and XLR ins/outs. Professionally cleaned and serviced. Some minor scratches on top cover.

$ 275  Contact Us  

ART Dual MP Model 254

Audio Proz Inv #: 33159

Two channel tube mic preamp - basic tube mic preamp, 48v phantom, in/out level led meter, 1 rackspace

$ 240  Contact Us  

Presonus Blue Tube Mic Pre

Audio Proz Inv #: 40931

2 channel tube preamp. XLR, 1/4 inch in/out. New in Box.

$ 200  Contact Us  

Aphex 107 tubessence

Audio Proz Inv #: 53204

2 mic in. 20db pad, gain control 80Hz low cut filter, polarity, phantom. With power supply. 9+ condition. Very low use time. Cleaned controls and switches. One rack scratch.

$ 188  Contact Us  

Aphex 107 Tubessence

Audio Proz Inv #: 53824

2 channels, tube gain stage preamp design. Like new unit, has better high-quality power supply. Minor scuff on top. In rack. Condition: 9

$ 188  Contact Us  


Need your guitar or bass amp tuned up? We are now doing 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


ART SCC

Audio Proz Inv #: 60036

Studio control center. Project series. 10 condition. New.

$ 148  Contact Us  

ART Tube MP/C

Audio Proz Inv #: 61024

Professional tube preamp/opto compressor - limiter/DI, hand-selected 12AX7a tube, +48V phantom power, #10 new in box

$ 128  Contact Us