Transformers & Chokes

One Electron

One Electron chokes and transformers are designed by John Atwood, to fill the need for high-quality yet affordable audio transformers and chokes that are not normally available elsewhere.

Hammond

Hammond Manufacturing offers a full range of transformers, chokes and enclosures.
P-C194B Choke - Hammond, for Fender Bandmaster, Dual Showman, etc.
Replacement for Fender Bandmaster, Dual Showman, Pro Reverb, Twin Super Equivalent to Manufacturer part number 125C1A & 022699 Specifications:
  • Inductance ± 15%: 4 H
  • D.C. Current: 90 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.
$17.86
P-T154-P-T156-X Filter Choke - Hammond, Open Bracket
Features
  • Economical "open bracket" - channel mount.
  • Tolerance of 15% on both inductance & resistance.
  • Inductances measured at rated D.C.
Starting at $12.81
Save 2%
Originally: $13.02
Note:
P-T156B: 1.5 mH / 5 A
P-T155B: 6 mH / 2 A
P-T159ZC: 60 mH / 2 A
P-T156M: 3 H / 100 mA
P-T157Q: 3.5 H / 150 mA
P-T156L: 5 H / 75 mA
P-T154G: 9 H / 40 mA (700 ohm)
P-T155C: 60 H / 8 mA
are special order items.
Note: some of these items are special order items.
P-T119DA Transformer - Hammond, Audio Interstage, 12 Watt
Developed in response to requests from the Collins Collectors Association"this is a matching audio transformer for older equipment with 600 ohm audio outputdriving modern speakers. Or for "classic" high impedance speakers used with newer equipmentsimply swap primary for secondary (ie...4 or 8 ohm input and 600 ohms out). Key Features Isolation unit: (i.e.
$30.16
P-T1750X-FENDER Transformer - Hammond, Output, replacement for Fender
  • Replacements for Fender Amps
  • 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".
Starting at $18.44
Partially Out of Stock
Note:
P-T1760C: 5W | 5k/8kΩ | 3.2/8/16Ω
P-T1750B: 10W | 5482Ω | 8Ω
P-T1750F: 15W | 6.95kΩ | 8Ω
P-T1760J: 40W | 4kΩ | 4/8/16Ω
P-T1760K: 50W | 4kΩ | 2/4/8Ω
P-T1760L: 60W | 4.2kΩ | 4/8/16Ω
P-T1760W: 100W | 2kΩ | 4/8/16Ω
P-T1750WR: 135W | 2kΩ | 4/8 Ω
are special order items.
Note: some of these items are special order items.
P-C194A Choke - Hammond, for Fender Deluxe, Deluxe Reverb, etc.
Replacement for Fender Deluxe, Deluxe Reverb, Vibrolux, Vibrolux Reverb Equivalent to Manufacturer part number 125C3A & 022707 Specifications: Inductance ± 15% 4 H D.C. Current 50 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.
$16.42
P-T125X Transformer - Hammond, Universal Push-Pull
  • Designed for general purpose or replacement use in push-pull tube output circuits. (For single ended use, see our 125 SE series - optimized for single ended tube output circuits).
  • Frequency response: 150 Hz. - 15 Khz (± 1db max. ref. 1 Khz).
  • Open style with minimum 5" long primary leads, secondary solder lugs for convenient secondary connections.
  • Tables provided with transformer listing 90 pre-calculated impedance ratios.
Starting at $36.82
Note:
P-T125B: 5 W / 45 mA
P-T125D: 10 W / 70 mA
are special order items.
Note: some of these items are special order items.
P-TUBT-3 Transformer - One Electron, Output, 3000 Ω to 16/8/4 Ω
The UBT-3 from One Electron is the same size and power (15 watts) as the UBT-1, but has a primary impedance suitable for single or paralleled tubes running at B+ voltages of 300 to 400 volts, such as: 2A3, WE 300B, 50, etc.
$109.95
P-T290-FENDER Transformer - Hammond, Guitar Amplifier, replacement for Fender
Replacement for Fender Champ, Vibro Champ, Princeton, Princeton Reverb, Tweed Deluxe Equivalent to Fender part number 125P1B & 022772 Primary:120 VAC, 60 Hz. For 240V version, see P-T290AEX Features:
  • Designed for drop in replacement of original units.
  • Physically, parts were designed to look similar to original factory units (where possible).
  • Plastic Core
  • Material used & design specs. were kept as close as possible to the original part to preserve the stock "tone".

Warning: Not all amplifier models of the same name use the same transformer model. Please make sure the amplifier transformer which you are replacing has a Fender number matching the equivalent Fender transformer number listed here.
Starting at $41.00
Note:
P-T290EBZ: '65 Twin Reverb Reissue - 120 V
P-T290YX: Bassman 70 Classic - 120 V
P-T290EEX: Bassman, Concert, Pro - 240 V
P-T290DEX: Super Reverb, Pro Reverb - 240 V
P-T290FEX: Twin Reverb, Dual Showman - 240 V
P-T290CEX: Vibrolux, Vibrolux Reverb - 240 V
are special order items.
Note: some of these items are special order items.
P-TUBT-1 Transformer - One Electron, Output, 1600 Ω to 16/8/4 Ω
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.
$125.00
P-T143 Transformer - Hammond, Power, 350-0-350V, 70-90 mA
Custom manufactured to replace most 6 and 7 tube sets of the early 1930s. Supplied with vertical mounting shells. Provides a seperate filament winding for audio output stages.
Specifications
Rating: 350-0-350 V, 70 or 90 mA (if 5 V winding is used with 2 A rectifier)
Windings: 5 V, 3 A; 2.5 V, 7.5 A; 2.5 VCT, 3.5 A
Mounting Centers:2 x 2.625"
Weight: 4.2 lbs.
Overall Height: 3.12"
$105.95
P-T166X-6D3 Transformer - Hammond, Low Voltage / Filament, Open, 6.3 VCT
  • Primary 115 VAC, 60 Hz.
  • Secondary 6.3 C.T.
  • Center tapped secondary.
  • Open style, channel bracket, two hole chassis mount.
  • Minimum 6" long leads.
  • Dual bobbin design - no electrostatic shield required.
  • Class B insulation (130 degrees, C).
  • Hi-Pot test of 2,000 V RMS.
  • UL listed (# E50394) & CSA certified (# LR3902).
Starting at $10.98
Note:
P-T166G6: 0.6 A
P-T166J6: 1 A
P-T166K6B: 1.2 A
P-T166S6: 10 A
are special order items.
Note: some of these items are special order items.
P-TUBT-2 Transformer - One Electron, Output, 4800 Ω to 16/8/4 Ω
The UBT-2 from One Electron is the same size and power (15 watts) as the UBT-1, but has a higher primary impedance suitable for single tubes running at B+ voltages of 400 to 500 volts, such as: 50, WE 300B,etc.
$129.95
P-T166X-2D5 Transformer - Hammond, Low Voltage / Filament, Open, 2.5 VCT
  • Primary 115 VAC, 60 Hz.
  • Secondary 2.5 C.T.
  • Center tapped secondary.
  • Open style, channel bracket, two hole chassis mount.
  • Minimum 6" long leads.
  • Dual bobbin design - no electrostatic shield required.
  • Class B insulation (130 degrees, C).
  • Hi-Pot test of 2,000 V RMS.
  • UL listed (# E50394) & CSA certified (# LR3902).
Starting at $16.44
Partially Out of Stock
Note: P-T166Q2: 6 A is a special order item.
P-T124X Transformer - Hammond, Audio Interstage, 5 Watt
  • Designed for general purpose or replacement use in push-pull or phase inverter tube driver circuits.
  • Should not be used for single ended applications. They have no gap for DC bias current present in SE mode.
  • Open style with minimum 5" long primary leads.
  • Minimum frequency response 150 Hz. - 15 Khz (+/- 1db max. ref. 1 Khz.) at full rated power.
  • Core material is Grain Oriented Silicon Steel.
Starting at $38.60
P-T125XSE Transformer - Hammond, Universal Single Ended
  • Designed for general purpose or replacement use (not Hi-Fi), in single ended, tube output circuits.
  • Frequency response: 100 Hz. - 15 Khz (± 1db max. - ref. 1 Khz). (For full frequency response (20 Hz. to 20 Khz.) - see P-T1627SE).
  • For push-pull output use, see P-T125A - optimized for push-pull tube output circuits.
  • Open style with minimum 12" long primary & secondary leads leads.
  • All sizes use butt stacked cores (using 29M6 steel) with an air gap, to reduce D.C.
Starting at $45.84
Note: P-T125GSE: 25 W / 100 mA is a special order item.
P-T1650X Transformer - Hammond, Tube Output, Push-Pull
  • Designed for push-pull tube output circuits.
  • Enclosed (shielded), 4 slot, above chassis Type 'X' mounting.
  • Frequency response 30 Hz. to 30 Khz. at full rated power (± 1 db max. - ref.
Starting at $85.25
Note: P-T1650W: 280 W / 1.9 kΩ is a special order item.
P-T193X Filter Choke - Hammond, D.C. choke, Enclosed
  • Enclosed, 4-hole mount chokes
  • Tolerance of 15% on both inductance & resistance.
  • Inductances measured at rated D.C. current.
  • Minimum 8" long leads.
  • Units will exhibit less inductance at slightly higher currents or more at lower currents.
  • Perfect for high voltage power supply filtering, case matches power transformers & tube audio output transformers.
  • Units are vacuum impregnated with polyurethane varnish for quiet and long life operation.
  • For more sizes and voltages (open - bracket mount type) - see P-T154-P-T156-X
  • Operating temperature range is -40C to 85C
Starting at $38.65
Partially Out of Stock
Note:
P-T193T: 0.05 H / 2 A
P-T193N: 3 H / 500 mA
P-T193P: 5 H / 500 mA
P-T193G: 10 H / 150 mA
P-T193M: 10 H / 300 mA
P-T193Q: 10 H / 500 mA
P-T193B: 12 H / 100 mA
P-T193C: 20 H / 100 mA
are special order items.
Note: some of these items are special order items.
P-T166N12 Transformer - Hammond, Low Voltage / Filament, Open, 12.6 VCT
  • Primary 115 VAC, 60 Hz.
  • Secondary 12.6 C.T.
  • Center tapped secondary.
  • Open style, channel bracket, two hole chassis mount.
  • Minimum 6" long leads.
  • Dual bobbin design - no electrostatic shield required.
  • Class B insulation (130 degrees, C).
  • Hi-Pot test of 2,000 V RMS.
  • UL listed (# E50394) & CSA certified (# LR3902).
$24.67
P-T263-X Transformer - Hammond, High Voltage Plate & Filament, Vertical mount
  • Vertical Mount. For Horizontal Mount, see P-T263-Z
  • Primary 115 VAC, 60 Hz. - except as noted
  • Enclosed, 4 hole, chassis mount.
  • Minimum 6" long leads.
  • Units can be run full wave bridge or full wave C.T.
  • Class A insulation (105 degrees C).
  • Hi-Pot test of 2,000V RMS.
  • Conservative designs - CSA certified (209651).
Starting at $48.97
Save 2%
Originally: $49.93
Partially Out of Stock
Note:
P-T263AX: 200 V C.T. @ 115 mA
P-T269BX: 300 V C.T. @ 86 mA
P-T263CX: 360 V C.T. @ 287 mA
P-T269GX: 450 V C.T. @ 75 mA
P-T270X: 480 V C.T. @ 46 mA
P-T270BX: 550 V C.T. @ 57.5 mA
P-T273DX: 700 V C.T. @ 103 mA
P-T274AX: 720 V C.T. @ 138 mA
P-T274X: 750 V C.T. @ 126 mA
P-T279X: 850 V C.T. @ 172 mA
P-T282X: 1,000 V C.T. @ 230 mA
are special order items.
Note: some of these items are special order items.
P-T125H Transformer - Hammond, Output, 8 W, 10k Primary
Specifications Audio Watts: 8 watts Primary Impendance (Ohms): 10K center-tapped Secondary Impendance (Ohms): 2/4/8 Mounting centers: 2-3/8u-bracket Weight: 1.0 lbs. Cat. No. Dimensions (Inches) A B C D G Mtg. Hole 125H 2.81 1.4 1.7 2.36 0.187
$37.00
P-T263-Z Transformer - Hammond, High Voltage Plate & Filament, Horizontal mount
  • Horizontal mount. For Vertical Mount, see P-T263-X
  • Primary 117 VAC, 50/60 Hz. - except as noted
  • Enclosed, 4 hole, chassis mount.
  • Minimum 6" long leads.
  • Units can be run full wave bridge or full wave C.T.
  • Class A insulation (105 degrees C).
  • Hi-Pot test of 2,000V RMS.
  • Conservative designs - CSA certified (209651).
  • For Vertical Mount, see P-T263-X
Starting at $65.03
Partially Out of Stock
Note:
P-T270DAZ: 520 V C.T. @ 104 mA
P-T273AZ: 650 V C.T. @ 46 mA
P-T291AX: 650 V C.T. @ 81 mA
P-T273CZ: 650 V C.T. @ 172 mA
P-T273DZ: 700 V C.T. @ 103 mA
are special order items.
Note: some of these items are special order items.
P-TBFT-1B Transformer - One Electron, BFT-1B, Power
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.
$225.00
P-T167X-6D3 Transformer - Hammond, Low Voltage / Filament, Enclosed, 6.3 VCT
  • Primary 115 VAC, 60 Hz.
  • Secondary 6.3 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).
Starting at $38.17
Note:
P-T167N6: 4 A
P-T167T6: 12 A
are special order items.
Note: some of these items are special order items.
P-C194E Choke - Hammond, Replacement for Vox AC30 vintage
Replacement for Vox AC30 vintage


Inductance ± 15%
30 H


D.C. Current
100 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.
$34.36
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