Audio Proz Service and Sales


ADA MB-1 AC transformer B507-E

Audio Proz Inv #: 51652

120vAC transformer for ADA MB-1. Excellent condition.

SOLD  Contact Us  

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Adcom GFP-1A

Audio Proz Inv #: 60988

Rackmount faceplate, lettering good but faceplate has lost black anodization and turned purple, no scratches, #7

$ 22  Contact Us  

Ampex AM10 MX10 3-position switch

Audio Proz Inv #: 46544

Appears to be the same part for either AM10 or MX10. Three position switch with two sets of contacts.

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APT Holman

Audio Proz Inv #: 63526

(1) MC Board (MC PreAmp), allows moving coil cartridge to be used in Apt Holman Pre-Amp. MUST BE INSTALLED. 100 ohm impedance, used - very good #9 condition

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APT Holman

Audio Proz Inv #: 53132

Special kit of black, anodized knobs with a shiny finish. 4 small, 2 large. Unique, custom set for prototype audiophile version. For in house use, requires special fit onto shafts. Very sexy! Like new! Condition 9+

$ 56  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.


APT HOLMAN

Audio Proz Inv #: 61095

Knob kit. 2 large, 4 small. Matte black quasi anodized paint. Nice #9+ condition.

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Apt Holman 19" Rack Face Panel

Audio Proz Inv #: 72400

Gray, All lettering intact, this face can use previous screws standard to regular face, very slight bend upper left hand corner, used, Condition #8+

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Apt Holman Pre Amp 19 " Rack mount Face Panel

Audio Proz Inv #: 72402

Black with white lettering, black anodized, all lettering intact, very light, small scratch below center screw very light about 2" long, this face can use previous screws standard to regular face, very good condition, shows well, Condition #9-

$ 68  Contact Us  

Apt Holman Pre Amp 19" Rack Mount Face Panel

Audio Proz Inv #: 72405

Black with white lettering, black anodized, all lettering intact, very slight discoloration of surface below lower right side screw hole, looks very nice, excellent condition, Condition #9

$ 88  Contact Us  

Apt Holman Pre Amp 19" Rack Mount Face Plate

Audio Proz Inv #: 72404

Black with white lettering, black anodized, all lettering intact *except (L-R) "L" slightly rubbed and discoloration of black surface, this face panel can use previous screws standard to regular face, very good, still shows nicely, Condition #9+

$ 88  Contact Us  

Apt Holman Pre Amp Standard Face Panel

Audio Proz Inv #: 72401

Black Pebble finish, small cosmetic flaws, above volume scratched very minor, right of "bass" discoloration, all lettering intact, very good condition, Condition #9

$ 88  Contact Us  


All Remotes are now 25% off or Free Shipping!!!  (Reel to Reel remotes excluded).


APT Holman Preamp

Audio Proz Inv #: 61153

#A02393, Removed back panel and power switch, no faceplate, missing some controls and components, for in-house use, for salvaging parts, not functional, #7

Not For Sale  Contact Us  

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APT HOLMAN PREAMP

Audio Proz Inv #: 61713

power switch, complete with mounting harness, button, leads, used, salvaged from unit, fully in tact, great condition, works well, condition # 9

$ 12  Contact Us  

Apt Holman Preamp Top Cover

Audio Proz Inv #: 71501

Brown stain on cover, could be painted. Condition 8

$ 14  Contact Us  

Apt Holman Rack Mount Face Panel

Audio Proz Inv #: 62875

Rack holes show some scratches and lower right hand corner slightly bent/distorted, grey smooth finish, lettering all intact and distinct, some paint scratch on top edge and bottom edges (19" wide x 3.5" tall) Used Good Condition, comes with no hardware, reuse standard Apt face screws to install. Condition #8

$ 68  Contact Us  

Apt Pre Amp Faceplate Gerard Grey

Audio Proz Inv #: 72783

Single Piece, Good condition, lightly worn, lightly scratched but no broken. #7 Condition

$ 20  Contact Us  

Apt Pre Amp Faceplate Gerard Grey

Audio Proz Inv #: 72781

Single Piece. In good condition with minor scuffs and wear. Corners lightly bent and scratched. #7+ Condition

$ 20  Contact Us  


We are presently operating on an APPOINTMENT ONLY basis. Please call us first at (617) 926-8020 to schedule an appointment before you come into the shop for repairs, rentals, product recommendations, consultations, or anything other than minor purchases.


APT preamp back panel

Audio Proz Inv #: 47016

(1) Complete back panel assembly with 120vAC connector. Excellent #9 condition.

$ 55  Contact Us  

APT preamp face plate

Audio Proz Inv #: 47015

Rack mount version, green and black color. No handles included with this piece, but some may be available here. Good #7 condition with three or four long scuff marks in middle, but acceptable for someone who needs a rack face.

$ 38  Contact Us  

APT Preamp Faceplate

Audio Proz Inv #: 56243

worn off lettering at volume & input label, very minor scuffs at edges, usable but obvious finger wear. Condition: 7

$ 20  Contact Us  

APT Preamp Faceplates

Audio Proz Inv #: 63434

Pebble Black Finish, various available. One (1) in #9 Condition- $68. Six (6) more available in various conditions, all good with no major damage, approximate #8+ condition -$46.

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APT Preamp Knob Kit

Audio Proz Inv #: 52516

charcoal gray, 2 large, 4 small, screws, very good condition-like new, condition #9


*for in house use*

$ 60  Contact Us  

APT Preamp Knob Kit

Audio Proz Inv #: 61096

2 large, 2 small. Typical grey anodized knobs. Used but real nice. No obvious scratches. #8 condition.

$ 52  Contact Us  


We know you have many options for purchasing audio equipment and parts, and we truly appreciate your business.  We strive to offer good products at competitive prices.  While we can't always match the prices of one isolated reseller, we make up for it by carefully selecting, testing, and finding unique and special rare parts, and we are here for the long run.  We guarantee everything we sell and we hope it helps you to enjoy a great listening experience.

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.


Audio Research MJ413

Audio Proz Inv #: 48449

Special, high voltage regulator transistor. New old stock.

$ 22  Contact Us  

Dynaco Preamp

Audio Proz Inv #: 58408

Substitute balance control for #1347005, 220K. Alps control is far better part. Click stop, high accuracy, low noise. Shaft must be cut down a little.

$ 18  Contact Us