Audio Proz Service and Sales

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Preamps
( 217 Preamps sorted by Price High to Low.)
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Shure M64
# 43886
Shure M64 stereo preamp. 2 channels, RCA ins/outs, equalization switch for phono, flat, or tape.
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Demeter VTMP-2A
# 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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APT 202A
# 45886
Moving coil preamp. 75ohm input impedance. Super low noise top board. Serviced and fully tested, with some capacitor updates. Excellent #9 condition.
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Bryston 1B
# 943207
Make an offer. In: Tape1/Tape2/Aux/Tuner/Phono 1 and 2. Ruggedized and fixed AC wiring. Complete, intact, working unit. Cleaned controls with AG cleaner. All channels calibrate +- 1db, with a 88db noise floor. Cleaned corrosion on board, fuse, and connectors. 220 Volt operation. #8- condition
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Aphex 107
# 46133
Two channel thermionic mic preamp. New in box.
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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
Pioneer SPEC-1
# 47386
Full function stereo pramplifier, silver face, 120/240v switchable, fully cleaned and tested, truly excellent cosmetic condition.
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Yamaha PG1
# 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
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Presonus Eureka
# 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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Amek System 9098
# 48664
High performance, solid state design, single channel, one rack space unit. Microphone preamp and equalizer can be used independently. All connections are balanced XLR. Excellent #9+ mint condition, includes manual, original box & packing.
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NAD 1155
# 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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APT Holman Preamp AP Rev5
# 50230
61G333 late version model, black face rackmount with handles. With AudioPro modifications Rev5. See "Custom Mods" page for more details! Excellent cosmetics.
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NAD 1300
# 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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ART USB Dual Pre PS
# 52232
Project Series two channel microphone preamp and USB audio computer interface. Fully balanced XLR and 1/4" TRS inputs. New in box.
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PS Audio 5.6
# 73235
Stereo Preamplifier. Phono, 2 tape in, 3 line inputs. Super quality built machine. High quality parts. Socketed Op Amp, OP 37 & LT 115. Controls/ connectors all cleaned, fully tested. Handles have slight metal discolor but otherwise very little signs of use/ wear. #9 condition
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Carver C-1
# 52481
Stereo w/sonic holography, inputs: 2 aux, tuner, 2 phono (1 for MM & MC), stereo/mono switch, speakers on/off, 2 tape/monitor loops, dubbing 1 to 2 & 2 to 1, loudness, tone on/off, 2khz & 8khz turnover switch, separate bass & treble for each channel, power switch is not operational. Switch jumpered to lessen noise in pre amp.
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We leave "SOLD" items on our website for machines that we often repair and provide parts for. This is to give you an idea of the products we typically carry, and direct you to alternatives you may not know about - we often have substitutes for out-of-stock parts, and are happy to recommend workarounds and different solutions to common problems.
Phase Linear 4000
# 62305
Autocorrelation preamplifier. Unit has seen extremely low use time. All controls switches board connectors cleaned corrected power supply per Phase Linear update, some IC sockets and best noise version op amp installed. Repaireds some RCA inputs and fortified them with glue. Replaced various capacitors anywhere in unit which measured off spec (about 20 caps changed). Install "star ground" modification to reduce noise and RFI ruggedize all board connectors auto corrector circuit. Spec of unit noise floor and channel matching is excellent! Tracks excellent +/-1db channel match!
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Creek OBH-8SE
# 53047
Phone preamp, we've installed MU metal shielding and changed the P. S. Grounds to make it super low noise, FET front end, condition #9
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Parasound P/FET 900II
# 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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Amber Preamp Two
# 54864
This Amber Preamp Two is in excellent condition and along with being serviced by AudioPro, has also received upgraded IC chips to 5532 and mute circuits. The back panel connectors have also been resoldered. -TAPE/AUX/TUNER/PHONE/ -Subsonic/Ultrasonic/Tape Filters -Mono/Stereo Switch/ Mute Switch -Balance/Volume Controls -Blackface 2 Unit Rack -Upgraded IC chips to 5532 -Upgraded Mute Circuit -Resoldered Back Panel Connectors
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Parasound P/SP-1000
# 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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NEC AVD-700
# 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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Apt Holman Pre Amp Modified Level III
# 63530
Top Quality Hi accuracy, very well built product. Complete service , clean and calibration. Inputs: Phono 1 and 2 , tuner, Aux1 and 2, Tape 1 and 2 (Dubbing 1>2 2>1) Level 3 modification by AP. See description here : https://www. Audioproz. Com/AP. Php?Article=95 #8+ condition Minor scuff on face panel.
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Audionics RS-1
# 55837
2 RU Rackmount preamp.
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Peavey Tube Sweetener
# 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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Rotel RC-970BX
# 62303
Stereo Control Amplifier (preamp), black face, very simple layout, bass/treble, tone on/off, tuner/cd aux/tape 1/tape 2 inputs, tuner/cd/aux/tape 1/tape 2 REC out selectors, excellent condition, very clean, easy to use, 2 hairline scratches right hand corner
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We are presently operating on an APPOINTMENT ONLY basis. Please call us first at (617) 926-8020 or email us at sales@audioproz.com to schedule an appointment before you come into the shop for repairs, rentals, product recommendations, consultations, or anything other than minor purchases.
ART PRO MPA II
# 57639
Variable impedance. Two channel MIC/HIZ. M/S Matrix. Variable plate voltage switch. QC Lubed, exercised, burn-in. #10 Condition (New)
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Onkyo P-3150 V
# 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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Adcom GTP-450
# 70494
AM/FM tuner/preamp. 14 presets. Bass/Treble + Balance Controls. Inputs: CD, Tuner, Tape/Tape 2, Aux. External processor loop. 1/4" headphone jack. Remote control RC-45 included. FM aligned and glue removed. #8 Condition. Note: No phono input.
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ART MP/C
# 73002
High quality Mic-preamp and tube/ vactrol compressor. One time rental. Box packing. Condition 9
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ADA MB-1 Guitar Preamp
# 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.
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