Audio Proz Service and Sales


Allied Control Co. MH-18D relay

Audio Proz Inv #: 48069

26.5vDC, 240 ohms. New.

$ 18  Contact Us  

Raytheon 292-11020G1

Audio Proz Inv #: 48068

150/600 ohms, +8dB max level, balanced line transformer in sealed shielded can. Excellent condition.

$ 30  Contact Us  

Ampex #4580200-12

Audio Proz Inv #: 48067

Matching input transformer. Very good #8 condition.

$ 26  Contact Us  

Raytheon UX-7350

Audio Proz Inv #: 48066

Very good #8 condition.

$ 8  Contact Us  

Essex Wire Corp C-280-A

Audio Proz Inv #: 48063

Class 1A transformer, in shielded metal can, 1.5" square. 250-4000 to 600 input, or output line balancing transformer. +24dB. Very good #8 condition, pair available.

$ 32  Contact Us  


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.


Halldorson TR-54

Audio Proz Inv #: 48062

Tiny size transformer for micro mic or guitar transformer coupling. New.

$ 14  Contact Us  

Halldorson TR-27

Audio Proz Inv #: 48061

New stock.

$ 8  Contact Us  

Halldorson TR-9

Audio Proz Inv #: 48059

Interstage transformer for audio coupling at guitar or mic level. New in box.

$ 16  Contact Us  

UTC DOT-1 interstage transformer

Audio Proz Inv #: 48058

25:1 imp ratio. Transformer coupler, for mic or guitar. New in box.

$ 16  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  

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  


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.


TOA line transformer

Audio Proz Inv #: 47956

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

$ 8  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  

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  

Altec 1588c

Audio Proz Inv #: 47642

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

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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  

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  


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.


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.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Teac 122 transformer UT-3061

Audio Proz Inv #: 46279

Excellent #9 condition.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

SLT-5W6-D transformer

Audio Proz Inv #: 46232

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

$ 14  Contact Us  

UTC A-21

Audio Proz Inv #: 45451

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

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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.

Contact Us  Contact Us  

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.

Contact Us  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.


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.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

Sescom TR-136A

Audio Proz Inv #: 45055

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

$ 14  Contact Us