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.
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.
$14.61
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Originally: $16.42

Replacement for Fender Bandmaster, Dual Showman, Pro Reverb, Twin Super Equivalent to Manufacturer part number 125C1A & 022699 Specifications:
Features:
- 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.
$15.90
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Originally: $17.86

Replacement for Marshall Plexi JCM 800.
Inductance ± 15%
40 H
D.C. Current
50 mA
Features:
Inductance ± 15%
40 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.
$31.26
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Originally: $35.12

Replacement for Vox AC30 reissue
Inductance ± 15%
5 H
D.C. Current
150 mA
Features:
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.
$33.49
Save 11%
Originally: $37.63

Replacement for Vox AC30 vintage
Inductance ± 15%
30 H
D.C. Current
100 mA
Features:
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.
$30.58
Save 11%
Originally: $34.36

Replacement for Marshall Plexi Specifications:
Features:
- Inductance ± 15%: 3 H
- D.C. Current: 250 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.
$19.70
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Originally: $22.14

The PRC-1 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.
$75.65
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Originally: $85.00

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.
$62.26
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Originally: $69.95

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.
$62.26
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Originally: $69.95

Special Order Item
Features:- Perfect for audio input, line matching, isolation or output transformer applications.
- 2 watt (± 1.5 dB, 300 Hz. - 50 kHz.).
- Epoxy potted in an attractive black molded case, Pin type P.C. board mount (min. 0.187" length).
- Power level ratings are maximum at lowest frequency rating
- Power can be increased slightly at higher frequencies.
- Will withstand soldering for 10 sec. @ 260 degrees C, ambient temp. 85 degrees C max.
$29.49
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Originally: $33.14

Special Order Item
Toroidal power transformer. 30VA, 50/60 Hz. 12.30% voltage regulation, open toroid center.- Torodial transformer benefits:
- low profile
- lightweight
- cool running / high efficiency
- due to the core shape - low stray magnetic flux leakage (low EMI)
- Dual 117/234 VAC primary, 50/60 Hz. operation.
- Note: Units are designed to have all windings engaged (either series or parallel connected) or connected as an autotransformer.
- Supplied with two neoprene rubber insulating pads, one metal centering washer and all mounting hardware
- Minimum 8" long flexible leads
- Manufactured using Class B (130 degree C) materials.
- Hi-Pot test of 4,000VAC RMS between primary & secondary
- UL recognized to UL506 (XPTQ2.Guide) UL file #E207860
- CSA certified to C22.2 #66 - CSA file #209651
- CE compliant to IEC 61558-2-4
$49.45
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Originally: $55.56

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.
$26.84
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Originally: $30.16

- 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 $34.35
Save 11%
Originally: $38.60

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
$32.93
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Originally: $37.00

Special Order Item
Specifications Audio Watts: 8 Primary Impendance (Ohms): 2.5k/4K center-tapped Secondary Impendance (Ohms): 6/8 - 3.2/4 Mounting centers: 2-13/16u-bracket Weight: 1.0 lb.
$31.35
Save 11%
Originally: $35.23

- 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 $32.77
Save 11%
Originally: $36.82

- 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 $40.80
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Originally: $45.84

Special Order Item
Audio watts: 4Impedance: 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.
$90.23
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Originally: $101.38

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"
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"
$94.30
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Originally: $105.95

Special Order Item
Audio TX driver, chassis mount.- 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.
- Primary: 600 ohms
- Secondary: 600 ohms
- Primary D.C.: 18 mA
- D.C. Resistance (±15%): 30 ohms primary, 38 ohms secondary
- Output: 200 mW
$19.56
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Originally: $21.98

Special Order Item
- Application: Driver
- Primary Impedance: 4000 ohms
- Secondary Impedance: 600 ct
- Primary D.C.: 8 mA
- Primary D.C. Resistance: 340 ohms
- Secondary D.C. Resistance: 24 ohms
- Output: 135 mW
- Dimensions A: 1.63
- Dimensions B: 0.88
- Dimensions C: 0.81
- Dimensions D: 1.38
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.
- Net weight: 0.5 oz.
$19.56
Save 11%
Originally: $21.98

Special Order Item
- Application: Driver
- Primary Impedance: 10000 ohms
- Secondary Impedance: 2000 ct
- Primary D.C.: 5 mA
- Primary D.C. Resistance: 700 ohms
- Secondary D.C. Resistance: 89 ohms
- Output: 135 mW
- Dimensions A: 1.63
- Dimensions B: 0.88
- Dimensions C: 0.81
- Dimensions D: 1.38
Features:
- Small, economical, open, two hole horizontal bracket mount.
- Insulated, color coded flexible leads, 4" long minimum
- Frequency response 150 Hz. to 15 Khz.
$19.56
Save 11%
Originally: $21.98

Features
- Economical "open bracket" - channel mount.
- Tolerance of 15% on both inductance & resistance.
- Inductances measured at rated D.C.
Starting at $11.40
Save 11%
Originally: $12.81

Special Order Item
- Vertical mount, split bobbin design.
- Non-concentric wound.
- Low primary to secondary coupling - no electrostatic shield required.
- High insulation - Hipot of 2,000V RMS.
- Class B insulation - 130 degrees C.
- CSA certified (File # LR3902) and UL recognized (File #E207860).
$6.84
Save 11%
Originally: $7.69