Audio Proz Service and Sales


Tube Output transformer #562100

Audio Proz Inv #: 43253

NEW STOC. For EL34 type tubes. EIA 606-543, for Fender and Marshall EL34 output. (not available at this time)

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U.R.E.I 8 80 12614-C Transformer

Audio Proz Inv #: 43916

Original transformer. 4 legs. Excellent #9 condition. Pair available, price is per transformer.

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UTC A-11 "A65 28" transformer

Audio Proz Inv #: 44061

Primary ohms - 50, 200, 50. Secondary ohms - 50K, P.P. Max level +5DBM. 20~-20KC, 500v hipot. Magnetic shield. 9 leg. Red Print on side. Excellent #9 condition.

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Chicago Standard Transformer Corp BO-1

Audio Proz Inv #: 44062

Plate voltage to 600ohm output. For tube preamp with feedback tap similar to Pultec. Frequency response 30 - 15000 (+20 DBM), P.W.V. 535. 8 legs. Excellent #9 condition. Pair available, price is per transformer.

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UTC A-18 transformer

Audio Proz Inv #: 44080

D72 44. 15k ohms primary, 80k ohms secondary. Max level +15dbm. 9-leg. Excellent condition.

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We are a very different kind of shop. To help ensure a smoother experience please read our letter about our current shop policies.

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.


UTC A-24 transformer

Audio Proz Inv #: 44083

168-46. 15k ohms primary; 500, 333, 200, 125, 183, 486, 50, 283, 485 ohms secondary. Max level +15dbm.

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UTC HE-812 transformer

Audio Proz Inv #: 44241

Like new, in package. Looks to be an interstage matching transformer..

$ 48  Contact Us  

UTC LS-12x

Audio Proz Inv #: 44414

Primary ohms: 500, 333, 200, 125, 50. 80ohms secondary. Excellent #9 condition with ribbon connector pre-soldered to pins.

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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  

Sescom TR-136A

Audio Proz Inv #: 45055

150/600/10k to 60k/10k. 9pin connector. New old stock.

$ 14  Contact Us  

UTCCR-725

Audio Proz Inv #: 45057

Transformer UTCCR-725, RCA #B-8480798-1. 100ohm to 600ohm/300ohm. 30 to 15kC, +20dBm. Used in #7 condition.

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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.


Scott 311-D parts

Audio Proz Inv #: 45163

We have many parts available for the Scott 311-D tuner, including meters, switches, controls, transformer #138952, TR-6-2, and tubes 6BS8, ECC82, EF94/6AU6, and 6U8A. If possible please provide us with a picture of the part desired. All parts in excellent condition. Meter, $25; various tubes, $8 to $12 each.

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Scott 310-D parts

Audio Proz Inv #: 45165

We have many excellent condition parts available for the Scott 311-D tuner, including meters, switches, controls, transformers, and tubes. If possible please provide us with a picture of the part desired. Meter, $25; Transformer, $12.

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UTC A-21

Audio Proz Inv #: 45451

50-200 ohm primary and secondary. Excellent #9 condition. Seven available.

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SLT-5W6-D transformer

Audio Proz Inv #: 46232

with Circuit Board Rectifier (#SUP-3460, TP-N85). Very good #8 condition.

$ 14  Contact Us  

Teac 122 transformer UT-3061

Audio Proz Inv #: 46279

Excellent #9 condition.

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Behringer OT-1

Audio Proz Inv #: 46540

High quality, shielded input or output transformer, from DBX 160xt or Behringer Composer Pro. For use with most DBX and Behringer products. Perfect condition new old stock. Two pieces available.

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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.


UTC CR-725

Audio Proz Inv #: 47525

Primary ohms 100; secondary ohms 600; max level +20dBm; frequency response 1/2dB 30-15Kc. Four pieces available.

$ 30  Contact Us  

UTC AR-533

Audio Proz Inv #: 47545

RCA 8446104-1. Input:Output is 1:1.58. Input impedance appears to be variable 50 to 1000, 10K to 50K output impedance. Perfect for high quality mic preamp with variable input matching. Used in very good #8 condition. 4 pieces available.

$ 40  Contact Us  

Altec 1588c

Audio Proz Inv #: 47642

Unusual phantom powered gain circuit and transformer installed in 8-pin octal can. Excellent condition.

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Webster Electric T-511-1

Audio Proz Inv #: 47643

Telephone line transformer. 10k ohm to 200 ohm, -25dBm. 6-pin connector, shielded can. Excellent condition, two pieces available.

$ 14  Contact Us  

United Transformer Corp H-42A

Audio Proz Inv #: 47646

10k to 10k ohm, max level 2dB. Excellent choice for certain tube cathode coupling or direct box matching. Ten pieces available, excellent condition.

$ 22  Contact Us  

TOA line transformer

Audio Proz Inv #: 47956

Chrome, 4" long, octal pins. Excellent condition. Three pieces available.

$ 8  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.


Halldorson 24s59

Audio Proz Inv #: 48056

Audio output transformer, 5watts, good for mini guitar amp projects or balanced line drive. Primary 25k ohms, secondary 3.5 ohms. New.

$ 24  Contact Us  

Halldorson 22s75

Audio Proz Inv #: 48057

Output transformer, can also be used as unusual mic pre or +24dBm 600 line drive. Primary 7k ohm, secondary 50 ohm.

$ 24  Contact Us