Audio Proz Service and Sales


United Transformer Corp LS-141

Audio Proz Inv #: 61330

500 ohm input  -  500/500 ohm output     Salvage-- Minor dings  #8 Condition

$ 68  Contact Us  

Adjust-A-Volt variable transformer T51u

Audio Proz Inv #: 49631

120v-6A, 50-60Hz, open frame transformer variac, 4.5" square metal mounting plate. Excellent condition.

$ 40  Contact Us  

Allied Control Co. MH-18D relay

Audio Proz Inv #: 48069

26.5vDC, 240 ohms. New.

$ 18  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.

Ampex #4580200-12

Audio Proz Inv #: 48067

Matching input transformer. Very good #8 condition.

$ 26  Contact Us  


Re: International Shipping: We ship internationally often and have yet to encounter a problem or complaint. We are very careful to test the equipment before it’s packed and then to double box the machine with added protection when needed for front panels, etc. We are not amateurs or an ebay store; we know these machines very well and know what it takes to get them to you safely. We use USPS priority internationally which seems to be the cheapest. If you prefer another carrier (you should know who delivers to your area reliably) please let us know. Also please be aware of any tariffs that you may be responsible for upon pick up on your end. International shipping may be expensive but we will make sure it is not a headache on top of the cost. PLEASE NOTE THAT SHIPPING INTERNATIONALLY WILL BE A MINIMUM OF $16 EVEN FOR SMALL PARTS.


Apex 460 transformer XFM0013

Audio Proz Inv #: 49529

New.

$ 24  Contact Us  

Apex 460 transformer XFM0013

Audio Proz Inv #: 49527

Power transformer for use in Apex 460 supply. New.

$ 24  Contact Us  

Audio Frequency Transformer 9072882 77-44

Audio Proz Inv #: 48070

6 watts, 60 cycles. Terminals 1-2 5k ohms; terminals 3-4 1.6k ohms. Can be used as line drive output transformer, +24dBm. Excellent condition.

$ 34  Contact Us  

Audio Speaker Autoformer

Audio Proz Inv #: 55172

Step up, down. High build quality, but unknown brand. Impedance match transformer, 28 ohm to 4 ohm. 30 watt capable. Used to allow loading of extra satellite speakers to be added to any stereo amp. Call for more details. Condition: 9

$ 16  Contact Us  

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.

Beyer 80-000-007

Audio Proz Inv #: 71604

High quality 600 ohm input impedance to 50K output impedance, with electrostatic shield,  few available, New item, (priced each)

$ 22  Contact Us  


Local customers, please do not come to the shop without calling ahead first - (617) 926-8020 - for an appointment, so that we can more efficiently help you with your equipment or sound recording needs.

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.


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.

SOLD  Contact Us  

Contact us about similar items or replacement parts.

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  

Freed Transformer Co. No: 32035

Audio Proz Inv #: 55815

Transistor output transformer. Scully part no.020-304-001. From Scully type 280. Scratch on print face, otherwise good shape, #9

$ 140  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  

Halldorson TR-27

Audio Proz Inv #: 48061

New stock.

$ 8  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.


Halldorson TR-54

Audio Proz Inv #: 48062

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

$ 14  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  

Jensen JE-123-SL 835

Audio Proz Inv #: 48138

Audio transformer for DBX or Behringer output. +24dBm. Very good #8 condition. Pair available. $66 each (call us at 617-926-8020 for best pricing)

$ 66  Contact Us  

Mic Input Transformers

Audio Proz Inv #: 70177

ACEM 70500852 - High quality, superior shielded, 600 to 50k mic transformer, 1" diameter, 12 available ($22 each), 

ACEM 70500166 - 600 to 600 ohm line transformer, up to +14DBM use, similar to most standard fit, 1.5" square fit, (depending use probable fit some square shield around), 4 available ($22 each)

$ 22  Contact Us  

Musashino TOA OT-333

Audio Proz Inv #: 55914

100 watt, 70 volt line transformer. Condition: 9

$ 24  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  


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.


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  

Raytheon UX-7350

Audio Proz Inv #: 48066

Very good #8 condition.

$ 8  Contact Us