Audio Proz Service and Sales


Tubessence Aphex 107 face plate

Audio Proz Inv #: 45343

New old stock, never used. For two channel thermionic microphone preamplifier. White lettering with gray background and purple border. Perfect condition!

$ 18  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  

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  

Symetrix SX-202

Audio Proz Inv #: 61557

Dual mic pre-amp, polarity: 0/180, 15dB pad, gain adjustment, balanced/unbalanced, line input + outputs, �" phone jacks, mic inputs: XLR, power supply: 12V AC 400mA, special knobs installed for RFI on audiophile caps and grounding updates and precise gain tweaks, channel gain matching and 2db better noise floor, #8 condition

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Rolls PB24

Audio Proz Inv #: 19289

Mic Preamp mono, phantom 12/48v, super compact, can run on battery or with power supply

$ 78  Contact Us  


We are a very different kind of shop. To help ensure a smoother experience please read our letter about our current shop policies.

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.


Rolls MP13 Mini Mic Preamp

Audio Proz Inv #: 18815

Mini Mic Preamp - Mic preamp with 30v phantom power

$ 90  Contact Us  

Rolls MP13 Mini Mic Preamp

Audio Proz Inv #: 19512

Mini Mic Preamp - Mic preamp with 30v phantom power

$ 90  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  

Presonus Eureka

Audio Proz Inv #: 47694

Mic preamp/compressor/parametric EQ. Demo unit, engineering sample. Excellent #9 condition with some minor scratches on top and bottom of case.

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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  

Peavey Tube Sweetener

Audio Proz Inv #: 56135

Tube line amp - 2 channel. 1/4 inch and RCA in/out per channel. 1 rack space unit. check and select tubes for channel and nice second harmonic enhancement with high quality controls. Unit can produce nice "soft sag" for guitar in studio. Nice soft clipping.

We can repair & service these units, call us at 617-926-8020 for more information

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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


Mic Input Transformers

Audio Proz Inv #: 70177

ACEM 70500852 - High quality, superior shielded, 600 to 50k mic transformer, 1" diameter, 12 available ($22 each), 

ACEM 70500166 - 600 to 600 ohm line transformer, up to +14DBM use, similar to most standard fit, 1.5" square fit, (depending use probable fit some square shield around), 4 available ($22 each)

$ 22  Contact Us  

Furman MM-8A

Audio Proz Inv #: 40829

Excellent quality low noise 4 mic pre mix to 2 channel (4x2 mixer). 48V ground lift, some minor updates. 5534 op amp design, 1 effects send.

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Demeter VTMP-2A

Audio Proz Inv #: 44032

Tube mic preamp modified by AudioPro. Modified gain and second order harmonic distortion for in-phase/out-of-phase harmonic. All variable gain drive for mic preamp and variable tube harmonic enhancement.

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dbx Mini-Pre

Audio Proz Inv #: 42402

Mint condition, single channel design with 12AX7 vacuum tube, -20db pad, phase switch, and 48v phantom supply. Peak and power LEDs. 60dB gain and -infinity to +10dB of output level. XLR microphone input, 1/4" TS line input, balanced 1/4" TRS and XLR outputs Table top design, very portable.

$ 80  Contact Us  

dbx Mini-Pre

Audio Proz Inv #: 42401

Mint condition, single channel design with 12AX7 vacuum tube, -20db pad, phase switch, and 48v phantom supply. Peak and power LEDs. 60dB gain and -infinity to +10dB of output level. XLR microphone input, 1/4" TS line input, balanced 1/4" TRS and XLR outputs Table top design, very portable.

$ 70  Contact Us  

DBX mini-pre

Audio Proz Inv #: 70575

Basic tube based design.  XLR & Phone (1/4) in/out. Like new Demo unit. #9 condition

$ 88  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  

Bellari RP533 Studio Tube Multi-Processor

Audio Proz Inv #: 57546

Unit has Super modified with fast slow compressor, many mods: updated power supply, added RFI protection on XLR, installed better output drive XLR op amp and high quality low noise Mesa Boogie 12A77 tubes, cleaned controls and used dielectric lube in switches. Low use time, very minor rack rash at holes. Face is cosmetically perfect. Condition: 8+

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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  

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  

Bellari RP520

Audio Proz Inv #: 30179

Tube Mic Pre, Gold Face, VU meters

$ 430  Contact Us  

Bellari MP110 Tube Mic Preamp

Audio Proz Inv #: 56095

20dB pad/phantom pwr/phase reverse switches. Gain/Volume controls. XLR, 1/4 inch in/outs. Has premium Phillips 12AX7WA tube. Brushed aluminum face, small footprint with original power supply. Scratches on bottom of unit, minor nicks on top. Condition #9

$ 110  Contact Us  


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.


Bellari MP110

Audio Proz Inv #: 30131

Single channel tube mic preamp, 1/2 rack space, XLR and 1/4" in/out

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Bellari 220 Dual Mic Pre

Audio Proz Inv #: 22546

Dual Mic preamp - Full mods (RFI, Front End Pad, Impedance/Transformer-Higher output level/lower noise, PS, Hi Filter, High Freq slight harmonic distortion, plate saturation, chassis flownoise) - super quiet

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