Audio Proz Service and Sales


APT Holman Pre Amp

Audio Proz Inv #: 72905

Pristine cosmetics and fully functional, Audio Pro Modified level III, capacitor updates throughout all boards, relay replaced, upgraded -super clean operation, All controls and switches multistage cleaning, soldering ruggedized throughout especially any connectors and grounds. Ground mods completed, eliminate any low level buzz or DC bleed. Full calibration and mods level III, Excellent cosmetics only light scratches on top cover. #9 condition

$ 988  Contact Us  

SAE Mark 1B

Audio Proz Inv #: 43246

Stereo pre and equalizer. Inputs: Phono 1 & 2, Aux 1 & 2, tuner. 3 tape monitor loops, 2 speaker sets, balance and gain controls, 7 band equalizer. Cap + Coil circuit. Class A Transistor design. Resoldered boards at equalizer circuit. #8- condition with minor scratches on top cover. Power switch glued in place.

$ 680  Contact Us  

Phase Linear 4000 autocorrelation preamplifier

Audio Proz Inv #: 63872

Discrete transistor phono preamp. Has discrete version 4 channel decoder board and Phase Linear updated / best version auto correlator.  RCA's in excellent condition.  SUPER SPEC CALIBRATED ! channel balance +/- 1db or better (one of the most accurate units we have seen) 90% Of all power supply caps replaced & upgraded at boards and main supply. Upgraded grounding on boards and ruggedized solder at board connectors.   ( By design this version 4000 does not lower the audio out signal to totally off at the back panel RCA. A very low level audio signal will always exist. The unit can be modified with a few resistor changes to be totally off if requested at sale)   Low use unit, face and knobs #9 condition

$ 680  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  

Nikko Beta 20

Audio Proz Inv #: 70940

Pre-amp is audiophile grade. 19" Rack mount. Black w/ white lettering. 1 Rack unit. Input: Tape 1, Tape 2, Aux, Tuner, Phono 1 + 2, (Phono switch mm or mc) Super quality class A FET design. Serviced, caps replaced on turn circuit and tested. Good condition. 3 scratches top edge of face panel. (can be touched up) #9 condition.  

$ 348  Contact Us  


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.


ADCOM GTP-740 A/V Preamp & Tuner

Audio Proz Inv #: 72820

Comes with remote. RCA & S Video inputs include: DVD, Digital RF, Digital Aux, LD, VCR, Video Aux, CD, Tape, Tuner. NO PHONO INPUT. RCA outs include: Front, Rear, Center, Subwoofer.  Many Surround mode settings. 14 FM preset slots. High quality blue boards & Capacitors. Unit has many cool functions, it is recommended that interested customers research these functions online before purchase to see if this unit will fit their needs. Unit has seen very little use time, cosmetically excellent. Faceplate, covers, all controls and connectors are super clean with only minor signs of use (light surface scratching, wear/ staining from age and light use.) #9 Condition.

$ 325  Contact Us  

Sumo 0620 Stereo Pre-amp

Audio Proz Inv #: 21849

Class A circuitry design pre-amp, very clean sounding unit, very good condition black one-sapce rack mount.

$ 300  Contact Us  

Rotel RTC-940 AX

Audio Proz Inv #: 41699

Tons of control, 8+ FM digital memory. Aux, CD, Tape 1/2 inputs. No phono inputs. Slim-line, black color (Adcom look), with remote. Excellent, #9 condition with box.

$ 300  Contact Us  

Adcom GTP-450

Audio Proz Inv #: 70288

Excellent basic design, two tapes, 1 aux, no phono, excellent FM, presets. All clean/calibrated. with remote control.  #9 condition

$ 288  Contact Us  

Parasound C/PT-1000R

Audio Proz Inv #: 27851

Tuner Preamplifier, Very good tuner, Digital Display, Excellent condition, PS and ground mods to eliminate hum, modified headphone out to be super quiet

$ 280  Contact Us  

Dynaco Pat 5

Audio Proz Inv #: 27128

Excellent Condition. 3 Tape ins, spare EPL external processor loop, 2 speaker switching capable. Many modifications and updates, most capacitors in audio circuits and upgrade some power supply capacitor clean all controls switch.

$ 280  Contact Us  


We have been selling and repairing professional and consumer audio equipment for over 40 years. (Read some of our customers testimonials here)

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.


Carver CT-24 Preamplifier Tuner

Audio Proz Inv #: 72286

Black face/rack mount, digital AM/FM 10 presets, excellent tuner, use of head phone jack stops audio output by design, FM battery memory OK, re-soldered power supply board and minor service updates, cleaned and calibrated, cleaned all connectors, 1 Phono, 3 Line-ins, 3 Tape loops, NO REMOTE, Condition #8+

$ 268  Contact Us  

Fisher 50-PR

Audio Proz Inv #: 27660

Phono preamplifier/equalizer, Mint Condition Cosmetically, Mono Vintage device in brown bakalite box with brass face plate, for 78 equalization, unit has powersupply upgrades, cleaned and serviced.

$ 265  Contact Us  

APT Holman Moving Coil Phono Preamp

Audio Proz Inv #: 61575

Set for 100 ohm impedance, but can be changed per customer request. (15db gain modified).  All caps updated / recapped, noise check, EQ check.OK #9 condition

$ 240  Contact Us  

APT Moving Coil Preamp

Audio Proz Inv #: 45882

#201/202. Moving coil preamp for Holman. Set for 100ohm input impedance, but can be changed per customer request. All caps updated, with noise check and EQ check. New old stock.

$ 240  Contact Us  

Adcom GTP-400

Audio Proz Inv #: 42302

FM/AM tuner, phono, CD, tape 1/2. Balance bass and treble controls. Unit has full service, including all cleaning and FM tuner alignment. Minor scratches on cover, some finger wear on controls, missing 1 memory button. #8 condition.

$ 200  Contact Us  

Audio Access PX-600

Audio Proz Inv #: 52812

preamp control unit only, requires special cable/connector, tested ok, condition #9

$ 200  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.


Creek OBH-8se

Audio Proz Inv #: 63596

MM Phono preamp, updated power supply, replaced power cord, checked for noise - floor is excellent, Condition #9

$ 188  Contact Us  

Rotel RQ-970 BX Phono Pre

Audio Proz Inv #: 71215

MM & MC inputs, Simple slimline design using super low noise AD744 OP amp. about 6db of gain extra for MC.  Audiophile grade components. Bench test QC, all OK. #9 condition 

$ 188  Contact Us  

Pyramid SEA-2500x

Audio Proz Inv #: 45446

Tuner, Aux, CD, Phono, Mic inputs. Bass, Mid, and Treble EQ controls. Made minor modifications to make perfect level and EQ match between channels. New stock, QC'ed.

$ 185  Contact Us  

Ashly SC-44 "Keyboard Input Processor"

Audio Proz Inv #: 51396

4-channel mixer with 3-band sweepable equalizer per channel, PA send, and separate monitor send. 3-rack space unit. Excellent condition, cleaned, serviced, tested.

$ 160  Contact Us  

Apt Holman 2014

Audio Proz Inv #: 61507

Mc pre-amp board. Complete. Good condition. Tested and working. Has original caps. #9

$ 148  Contact Us  

APT moving coll preamp, model 201A

Audio Proz Inv #: 61188

Set for 100Ω impedance but this version can be reset to as low as 20Ω, low noise spec, no capacitor update but unit performs perfect, low use, QC check, #9

$ 128  Contact Us  


Need an APT unit serviced or modified? Vince, the owner of Audio Pro, ran the production line at APT for many years, and has decades of experience working with APT products. Read all about our APT Holman service and mods here. Also read about the APT Moving Coil Phono Mod Here.


Pyramid SEA 2500

Audio Proz Inv #: 63815

Basic Preamp. This is an excellent quality product, with high quality controls, switches. Input switching IC is same as expensive products. Low noise op amp for phono. 3 band eq. Some ground mods were done. rack mount. #9 condition

$ 128  Contact Us  

B&K PT3 Series II Tuner Preamp

Audio Proz Inv #: 71220

5 line inputs, (no phono) with original remote control, (face plate lettering is dim)  Be careful in sleep mode (button), powered on unit may look to be off ! # 7 condition.

$ 118  Contact Us