One Electron magnetic products have been designed to fill the need for high-quality yet affordable audio transformers and chokes that are not normally available elsewhere. This is why we have concentrated a bit more on the esoteric types. If you are interested in having One Electron add a new product, contact us, but keep in mind we only mass-produce our products. One Electron does not do custom transformer designs. One Electron transformers and chokes are sold only through Antique Electronic Supply (retail) and CE Distribution (wholesale).

The datasheets for each type have specifications, application information, mechanical drawings, and suggested mounting holes.


Single-Ended Audio Output TransformersUBT picture

The UBT series of single-ended output transformers are well-known for their clean, detailed sound, and broad bandwidth.

 Type

 Primary
Impedance

Secondary
Impedances 

 Max. DC
Primary Current

 Max.
Power

 Datasheet

 UBT-1

 1600 ohms

 4, 8, 16 ohms

160 mA

 15 W
 UBT1_20.pdf

 UBT-2

 4800 ohms

 4, 8, 16 ohms

 110 mA

 15 W
 UBT2_10.pdf

 UBT-3

 3000 ohms

 4, 8, 16 ohms

 110 mA

 15 W
 UBT3_10.pdf


Plate Retard Coils/High Quality Audio Chokes

PRC-1, 2:
PRC-1,2
PRC-3:
PRC-3

The PRC series of audio chokes are intended for shunt-feed single-ended output stages, but are also useful where a high quality filter choke is needed. Each has two windings that can be connected in series or parallel.

 Type

 Connection

 Inductance

 Max. DC
Current

 Resistance
(ohms)

 Datasheet

 PRC-1

 Parallel

 5.5 H

230 mA

 32

 PRC1_10.pdf

 Series

 22 H

115 mA

  128

 PRC-2

 Parallel

 12 H

150 mA

  76
 PRC2_10.pdf

 Series

 48 H

75 mA

  304
 PRC-3 N/A
225H
15 mA
1,850


Power TransformersBFT1B picture

All One Electron power transformers are designed for critical audio applications and include an electrostatic shield between primary and secondary and a copper flux band to reduce stray magnetic fields. The international primary accomodates 100, 110, 120, 200, 220, 230 and 240 volt mains at 50 or 60 Hz.

 Type

 Secondary #1

 Secondary #2

 Secondary #3

Secondary #4 

 Datasheet

 BFT-1B

 770 VCT, 340 mA, with taps at 520 VCT

 5 VCT, 4 A

 6.3 VCT, 9.6A

 6.3 V, 4 A
 BFT1B_11.pdf

Note: for archival purposes, data on the earlier BFT-1 and BFT-1A transformers is given here: BFT1A_10.pdf.


One Electron transformers are distributed by Antique Electronic Supply. They can be reached at:

Go to the One Electron home page