Audio Proz Service and Sales


Otari 5050B main power supply PB9A171B

Audio Proz Inv #: 47908

Main power supply and logic board with relays. Pulled from working machine with hardly any use time. Color coded connectors intact in proper position. Excellent #9 condition.

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Otari 5050b knob kit

Audio Proz Inv #: 48625

Grey version. Includes three upper knobs, three lower knobs and two washers. Worn #7 condition.

$ 14  Contact Us  

otari 5050b KEW038 spindle base

Audio Proz Inv #: 48672

3/4" diameter, three holes with three small flanges. Base for twist lock spindle.

$ 6  Contact Us  

Otari 5050B II left brake

Audio Proz Inv #: 48076

Left side brake assembly. Excellent condition.

$ 28  Contact Us  

Otari 5050B dual knobs

Audio Proz Inv #: 47960

Top knob and bottom ring, grey color, with clear slip washer and set screws. (1) sets of knobs available. some scuffs / wear on top. condition #8

$ 14  Contact Us  


We offer expert time-saving advice on repairing many types of home and studio equipment, as well as consulting for product and recording issues, at a fair and reasonable cost.  For complex matters, we sometimes must charge a small technical fee.  If we can help solve your repair problem or technical conundrum, give us a call.  (617)926-8020.


Otari 5050b cue arm

Audio Proz Inv #: 48668

with latch. New stock.

$ 14  Contact Us  

Otari 5050B BII HD

Audio Proz Inv #: 53072

tension arms only for forward or supply, 2 available, #9 condition

$ 34  Contact Us  

Otari 5050B 50k potentiometer

Audio Proz Inv #: 47959

M 20k ohm A, dual control pot with leads intact. Excellent condition. Two pieces available.

$ 8  Contact Us  

Otari 5050b 5-position micro switch

Audio Proz Inv #: 48763

Play, fast forward, stop, rewind, pause. Excellent condition, from low use machine.

$ 6  Contact Us  

Otari 5050B #PB9A177A

Audio Proz Inv #: 47961

Switch assembly edit, reel, speed, power,  with wire leads  Individual switches $8 ea,  #9 condition

$ 8  Contact Us  

Otari 5050B

Audio Proz Inv #: 61869

(2) Meter T90919 #8+ good bulb (24$). (2) Meter 93.12.16. #9 good bulb (24). 

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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.


Otari 5050 transport buttons

Audio Proz Inv #: 47609

Older, smaller style button with six horizontal lines. Orange color for record.  with 1/8" space on each side when installed. Very good condition. # 8 condition

$ 8  Contact Us  

Otari 5050 transformer

Audio Proz Inv #: 44753

Old version Transformer #ET-11-186. Good #8 condition--leads are cut short but are still usable.

$ 30  Contact Us  

Otari 5050 Starm Arm Sensor Switch

Audio Proz Inv #: 44747

Good #7 condition.

$ 14  Contact Us  

Otari 5050 Series hub spacer adapter

Audio Proz Inv #: 47624

This is the special Otari part that easily fits on the button of a KWOH009 10" hub to convert the 1/4" reel hub to correctly use 1/2" reels. Two pieces available.

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Otari 5050 Series head 4A01F

Audio Proz Inv #: 49739

Reproduce head for 1/2 track 5050 Series machines. New old stock.

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Otari 5050 Series erase head 227B

Audio Proz Inv #: 49790

Erase head for 2-track 5050 Series machines. New old stock.

$ 32  Contact Us  


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.


Otari 5050 series

Audio Proz Inv #: 62823

(2) Hub locks 1/4 reels #KWOH00 $88 EACH #8 condition

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Otari 5050 right brake assembly

Audio Proz Inv #: 48075

with attached plate, brake guide, and hub. Very good condition with some minor wear on brake pad.

$ 26  Contact Us  

Otari 5050 reel table and spindle

Audio Proz Inv #: 47621

"Bullet" style center spindle, NOT the twist lock version. Reel table has 24 rectangular slots for gripping. Very good #8 condition with some very minor rust spots and rubber wear.

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Otari 5050 reel motor

Audio Proz Inv #: 44745

Old version. Left side reel motor with brake band/solenoid. Good #7 condition.

$ 36  Contact Us  

Otari 5050 power transformer TF-11030

Audio Proz Inv #: 52018

Complete with all Molex connectors. TF-11030 3D12127. Excellent condition. (Possible Others Exist)

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Otari 5050 Operating Manual

Audio Proz Inv #: 41640

Original manual for Otari 5050 MKIII8, complete, #8 condition, MANUAL ONLY

$ 68  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.


Otari 5050 Old Series

Audio Proz Inv #: 58251

Wood side board with handle. 19 1/2 by 7 5/8. Fits left or right. 7+/10 condition (Nice, but minor wear and dents on corners).

$ 18  Contact Us  

Otari 5050 Motor Starter Capacitor

Audio Proz Inv #: 44748

5.5uf, 250 wv ac. #7 condition.

$ 14  Contact Us