Transformers & Chokes

Open style, chassis mount transformers with a 115V 60Hz primary and a 120V center tapped secondary.

Open style, chassis mount transformers with a 115V 60Hz or 50/60Hz primary and a 14V center tapped secondary.

Replacement for Vox AC30 reissue


Inductance ± 15%
5 H


D.C. Current
150 mA


Features:

• Designed for drop in replacement of original units.
• Physically, parts were designed to look similar to original factory units (where possible).
• Inductances measured at rated D.C. current.
• Material used & design specs. were kept as close as possible to the original part to preserve the stock "tone".
• Units are vacuum impregnated with polyurethane varnish for quiet and long life operation.

The PRC-2 audio choke from One Electron was designed for shunt-feed single-ended output applications, but is also useful where quality inductive loads are needed or as high-quality filter chokes.

The BFT-1B from One Electron was designed to power a stereo amplifier using UBT-1's in each channel but will also power an 80 watt push-pull tube amplifier. The BFT-1B is slightly larger than earlier versions of the BFT-1, allowing lower flux density and cooler operation. The tapped high-voltage windings and three filament windings provide flexibility in design. An electrostatic shield between the primaries and secondaries reduces power-line noise coupling. The primary arrangements allows use on virtually any power grid in the world.

Fender® Original Tone Master Power Transformer. Equivalent to #026477.

Genuine Marshall™ 50 watt power transformer for JCM900.

The UBT-1 from One Electron is a low-impedance single-ended output transformer intended for parallel combinations of tubes running a B+ voltages of 250 to 325 volts, such as: two or three EL34s (triode connected), three 2A3s, two 300Bs, two 6AS7s, etc., as well as single sweep tubes run in 'enhanced-triode' mode, resulting in 10 to 15 watts of output power.

• Dual primary 115/230 VAC
• 50/60 Hz. operation
• Dual secondaries for series or parallel connections
• 4,000 V RMS Hipot test
• Class F insulation (155 degrees, C)
• Chassis mount
• Dual bobbin construction
• Dual use terminals
• C UL US recognized (E207860)
• TUV Type Approved
• CE certified to IEC 950 (Approved to EN 60-742 Safety Isolating Transformers)

• Primary 115 VAC, 60 Hz.
• Secondary 5 C.T.
• All secondaries center tapped, VAC (RMS)
• Enclosed, 4 hole chassis mount.
• Minimum 6" long leads.
• Dual bobbin design - no electrostatic shield required.
• Class B insulation (130 degrees C).
• Hi-Pot test of 2,000V RMS.
• UL listed (# E50394) & CSA certified (209651).

• Primary 115VAC, 60 Hz.
• Secondary 115VAC
• Electrostatic shield between primary & secondary
• Connection by flexible leads, 8" minimum length
• Perfect for circuit isolation or "Classic" bias power supply
• CSA certified (209651)
• Remember - These units do NOT convert line frequency

Specifications:

• Size: 15 VA
• Dual Primary: 117 VAC, 234VAC, 50/60 Hz.
• Secondary VAC RMS Series: 5V @ 3 A
• Secondary VAC RMS Parallel: 2.5V @ 6 A

Features:

• Primary 117/234 VAC, 50/60 Hz.
• Dual secondaries
• Secondaries can be used as; a center tapped secondary, parallel connected or used individually
• Units are designed for use with all windings engaged.
• Open style.
• Minimum 6" long leads.
• Dual bobbin design - no electrostatic shield required.
• Class B insulation (130 degrees, C) for extra p

The PRC-3 audio choke from One Electron was designed as a plate load for the output of either a high quality line amplifier or a phono preamp.

Audio watts: 4
Impedance: 5k ohms
D.C. Resistance: 178 ohms
Inductance: 44 henries
Rated D.C. Bias Current: 30 mA
Features:

• Designed for driver use ONLY in single ended tube output amplifiers. These units replace coupling capacitor circuits for improved sound.
• Closed style with minimum 8" long leads.
• All models use bifilar wound windings for exceptional coupling and bandwidth.
• Minimum frequency response 20 Hz. - 20 Khz (± 1db max. ref. 1 Khz.).
• The core is gapped to support the specified D.C.

• Open style, chassis mount transformers with a 115V 60Hz primary and a 50V center tapped secondary.

• Open style, chassis mount transformers with a 115V 60Hz primary and a 16V center tapped secondary.

Specifications:

• Size: 18 VA
• Dual Primary: 117 VAC, 234VAC, 50/60 Hz.
• Secondary VAC RMS Series: 36V @ 0.5 A
• Secondary VAC RMS Parallel: 18V @ 1 A

Features:

• Primary 117/234 VAC, 50/60 Hz.
• Dual secondaries
• Secondaries can be used as; a center tapped secondary, parallel connected or used individually
• Units are designed for use with all windings engaged.
• Open style.
• Minimum 6" long leads.
• Dual bobbin design - no electrostatic shield required.
• Class B insulation (130 degrees, C) for extra

Specifications:

• Size: 48 VA
• Dual Primary: 117 VAC, 234VAC, 50/60 Hz.
• Secondary VAC RMS Series: 48V @ 1 A
• Secondary VAC RMS Parallel: 24V @ 2 A

Features:

• Primary 117/234 VAC, 50/60 Hz.
• Dual secondaries
• Secondaries can be used as; a center tapped secondary, parallel connected or used individually
• Units are designed for use with all windings engaged.
• Open style.
• Minimum 6" long leads.
• Dual bobbin design - no electrostatic shield required.
• Class B insulation (130 degrees, C) for extra p

• Primary 115 VAC, 50 / 60 Hz.
• At 2,000 VAC and above, secondary leads are through rubber bushings
• Units can be run full wave bridge or full wave C.T.
• V.A. is a C.C.S. rating
• Current ratings are CCS (Continuous Commercial Service) & ICAS ratings (Intermittent Commercial or Amateur Service).
• Enclosed, 4 hole chassis mount.
• Minimum 6" long leads.
• Class A insulation (105 degrees C).
• Hi-Pot test at a minimum of twice secondary voltage
• Conservative designs - CSA certified (209651).

• Primary 115 VAC, 60 Hz.
• Designed for small power or bias supplies, test equipment, preamps etc.
• Economical , two hole, channel bracket, chassis mount.
• Minimum 5" long leads.
• Convenient 12.6 filament/auxiliary winding.

Replacement power transformer for Marshall JTM45.

• Replacement for Yorkville/Traynor amplifiers
• Designed for drop in replacement of original units.
• Physically, parts were designed to look similar to original factory units (where possible).
• Material used & design specs. were kept as close as possible to the original part to preserve the stock "tone".

Part No. Primary Secondary 1 Secondary 2 Secondary 3 Yorkville / Traynor Amp Yorkville / Traynor Part No VAC Hz. P-T290TRA 120 V 60 Hz. 320 V @ 600 mA 60 V @ 50 mA 6.3 V.C.T. @ 9 A 100 Watt Bass A-1380 P-T290TRB 120 V 60 Hz. 620 V @ 115 mA 6.3 V.C.T. @ 115 mA YBA2-B A-1314 P-T291JX 120 V 60 Hz. 320 V @ 500 mA 60 V @ 20 mA 6.65 V.C.T.

Features:

• Small, economical, open, two hole horizontal bracket mount.
• Insulated, color coded flexible leads, 4" long minimum
• Frequency response 150 Hz. to 15 Khz. (+/- 1 db, reference 1000 Hz.)
• When operating at impedances below nominal, power capability and the frequency spectrum are proportionately lower, conversely, at higher impedances power capability and frequency spectrum will be proportionately higher.

Part No. Applicaton Nominal Impedance (Ohms) Primary D.C. D.C.

Features:

• Small, economical, open, two hole horizontal bracket mount.
• Insulated, color coded flexible leads, 3" long minimum
• Frequency response 150 Hz. to 15 Khz. (+/- 1 db, reference 1000 Hz.)
• When operating at impedances below nominal, power capability and the frequency spectrum are proportionately lower, conversely, at higher impedances power capability and frequency spectrum will be proportionately higher.