Audio Proz Service and Sales


Phase Linear 3500

Audio Proz Inv #: 22762

Preamp - 3 band sweepable parametric EQ, selectable EQ bandwidth, tone bypass, 2 tape monitors, 1 aux input. Low filter, mute and loudness switches, cleaned and calibrated, Modified - Call for details

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Phase Linear 2000

Audio Proz Inv #: 62240

nice, basic preamp, EQ, updated with TL075 op amp for tone controls (lower distortion, noise), did 250pf and 18k resistors on all input jacks for RFI protection, did 50pf RFI protection on phono input, revised more correct grounding for phono input, updated power supply capacitors and improved grounding, nice face, not original bass controls, # 8 + condition

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Parasound P/SP-1000

Audio Proz Inv #: 54866

This Parasound P/SP-1000 has low use and has been all calibrated and all serviced by Audiopro to ensure the unit is in excellent working condition. -AV Processor/Pre-Amp -LD/Video 1/Video 2/Tape/Line Inputs -Dolby Pro Logic -Reverbs: Stadium, Hall, Club -Preamp Direct Option, Bass EQ Switch - 15/20/30ms Delay -Subwoofer/Rear/Center Levels -Overload and Front Balance Knobs -2 Space Rack Mount

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Parasound P/FET 900II

Audio Proz Inv #: 54863

The Parasound P/FET 900II is a Class A circuit preamp using audiophile grade componets, with a full featured set of ins and outs, slim black faced design, and this particular unit has our improved grounding mod which helps reduce any unwanted hum in the signal path. The unit is in excellent condition and like all our items, it has been cleaned and inspected by Audio Proz to ensure you are receiving the highest quality products. -Inputs: Tape 1/Tape 2/Video/CD/Tuner/Phono -Record Out on Tape 1/2 -Bass/Treble/Balance/Loudness/Volume Controls -Tone Defeat/ Mono Switches -No Headphone -Black -AudioProz grounding Modification -Condition #9

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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  


If you are having trouble finding parts, enter the name into our search bar at the top of the page. Please be aware there is a minimum $4-$6 to ship any part. International orders will be $14-$16 to ship for anything larger than an envelope. Shipping costs are non negotiable, so please, PLEASE do not ask for a part, or for us to search for, or quantify a part if you cannot pay for the shipping.


Ortofon MCA76

Audio Proz Inv #: 17004

moving coil preamp

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Onkyo P301

Audio Proz Inv #: 57761

Phono in, 6 line level inputs, front panel in black, nice EQ. #9

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Onkyo P-3150 V

Audio Proz Inv #: 57891

Better quality phono, tone control slider a little sticky, but works, special enhancement EQ control. #7, missing front bezel. 7 inputs.

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Nikko Beta 50 II

Audio Proz Inv #: 17049

Stereo Preamp, On front panel 2 input mixing/monitor, 3 external processor loops, resoldered, modified, cleaned, new power supply

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Nikko Beta 50

Audio Proz Inv #: 14480

Preamp - Stereo, modified (PS, headphone, regulator stage, tone control for better signal to noise), unit in excellent condition

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Nikko Beta 30

Audio Proz Inv #: 25159

Stereo preamp with box, packing, and manual, 1 1/4 rack space (non standard) power supply mods, 2 simultaneous ins/outs, sound proc loop, phono, tape monitor, bass treble

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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.


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  

Newmann PV76

Audio Proz Inv #: 44157

Up to 76dB gain in 6dB increments, selectable high pass filter at 40, 80 and 140Hz, XLR mic level inputs and XLR +4 dB outputs.

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NEC AVD-700

Audio Proz Inv #: 55112

Disital Surround Processor/Preamp. CD/Tuner/Aux 1/Aux 2/Tape/Video 1/Video 2/Video 3/Video 4/ TV/SS inputs. Adjustable millisecond delay/ channel inversion/ adjustable echo. Dolby surround/Hall/Matrix/Creation modes. Adjustable left/right input level. Nice line level remote preamp, excellent surround processor. Blackface unit with digital display. Ruggedized grounds, updated power supply. Unit has remote. Condition #8+

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Nakamichi TA-3A

Audio Proz Inv #: 63461

Receiver converted into PREAMP. Black faceplate. Phono, CD, Video 1, Video 2, Tape 1, and Tape 2 inputs. 10 tuner presets. Built on (non-original) volume knob, with cut hole for LED indicator. #7 condition 

$ 98  Contact Us  

Nakamichi CA-7A

Audio Proz Inv #: 62855

Control Amp. (2) Phono in with selectable MC/MM, 3 position cartridge loading switch, and 3 position gain selector. Tuner, CD, Aux 1 and 2 inputs. (2) Tape loops, and (2) set main RCA outputs. (Has some DIN connectors for Tape, CD, Tuner). Complete cleaning and serviced by AP. No remote, Missing (2) function selector gap covers. #8 condition. Missing (2) Function selector gap covers for CD and Tuner

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NAD Series 20 1020

Audio Proz Inv #: 26539

Stereo preamp, Good phono preamp, all controls and switches cleaned

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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.


NAD PP-1

Audio Proz Inv #: 59056

Basic as new demo high quality phono preamp. 9/10 condition.

$ 88  Contact Us  

NAD C162

Audio Proz Inv #: 70757

Fancy high preamp. Class A module design. Slimline design. Bass/treble controls. MM, MC input. Headphone out. Unit does indeed have little more clarity in over all design (subtle). Some power supply upgrades of crucial resistor and rugged resoldering. #9 condition.

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NAD 1300

Audio Proz Inv #: 61197

Pre amplifier, superior design, gunmetal gray, rack mount with rack handles, excellent phono stage, MM + moving coil class A fet design, eq circuit with turnovers (3), (bass 50/120/250 treble 3K/6K/12K), external processor (EPL loop), cosmetics excellent, low use, all control switches cleaned, #9

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NAD 1240

Audio Proz Inv #: 63173

Stereo Preamp. Tuner, Phono, CD, Aux 1, Aux 2, and Video inputs. Loudness, and low level switch. Bass and treble EQ controls. Infrasonic filter switch. #8+ condition - Minor scratches and wear on face and top cover. 

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NAD 1155

Audio Proz Inv #: 50224

Stereo preamp with headphones out, phono/MM/MC in, aux/tape/CD in, monitor listen switch. Excellent basic audiophile preamp. Professionally cleaned, serviced, tested.

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NAD 114

Audio Proz Inv #: 71510

Stereo preamplifier - Gray with black knobs - Slim unit. Inputs: 2 tape (1+2) Tuner, Aux, Video, CD, Phono (MM)  Outputs: 2 Preouts and Headphone (1/4" Jack). When headphones are plugged in, Pre outs are muted -Nice feature! Very nice quality basic preamp with good phone stage.  Low use #9 condition

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Local customers, please do not come to the shop without calling ahead first - (617) 926-8020 - for an appointment, so that we can more efficiently help you with your equipment or sound recording needs.

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.


NAD 1130 Stereo Preamplifier

Audio Proz Inv #: 43200

Phono/Aux/CD/Tape1/Tape2/Tuner in. 2 outputs, 2 band bass/treble tone control. Capacitance load switch. Does moving cartridge or moving magnet. #8+ condition with some minor scratches on top cover. All controls and switches cleaned. Fully tested. No noise or modulation.

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Model PE2 Line Amp

Audio Proz Inv #: 26438

Preamp, 600 ohm in, 8 ohm out, input/output volume control, small add on line box converter for installation/adapting audio signal - call for details

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