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  


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 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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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  


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.


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  


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