Hammond 1760J 40W Push-Pull Output Transformer for Pro Reverb
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Create Free Business AccountKey Features
- 40 W push-pull output transformer, 4,000 ohm C.T. primary
- 4, 8 and 16 ohm secondaries
- For Fender Bandmaster, Tremolux and Pro (Ref. 125A6A, 022848, 125A7A)
- Bobbin wound
- Frequency response 70Hz - 15KHz (0/-1.5dB), distortion under 1% at 70Hz
- Open style, all leads 9 in long minimum
- 1500VRMS dielectric strength, -40 to 105 degC
- RoHS and REACH compliant
The 1760J is a 40 watt push-pull output transformer for tube guitar amplifiers, listed for the Fender Bandmaster, Tremolux and Pro and similar to Fender part numbers 125A6A, 022848 and 125A7A. The chassis references span Blonde, 6G7-A, Blackface, AA763, AB763, Silverface, AC568, AD1269 and several Reverb variants, so it suits technicians servicing many generations of these amplifiers.
It is bobbin wound with a 4,000 ohm center-tapped primary and 4, 8 and 16 ohm secondaries. Frequency response is 70Hz to 15KHz (0/-1.5dB referenced at 1KHz) and distortion is below 1% at 70Hz. DC resistance is 185.0 ohms (primary brown-blue), 0.356 ohm (black-green), 0.502 ohm (black-yellow) and 0.910 ohm (black-white). The primary brown-blue measures 19.5H (124K ohm) at 1.0 kHz, 1.0 V, with 35.93mH leakage inductance. Dielectric strength is 1500VRMS and the temperature range is -40 to 105 degC.
Materials and design specifications were kept as close as possible to the original to preserve the stock tone. The open style unit has all leads at least 9 in long. Primary leads are brown, red (center tap) and blue; on the secondary, black is common, green is 4 ohm, yellow is 8 ohm and white is 16 ohm.
Drawing dimensions are A 4.000 in, B 2.80 in (REF), C 2.63 in (MAX) and D 3.560 in, with a 0.187 in slot. Shipping weight is 4 lbs (1.81 kg). The 1760J is RoHS and REACH compliant.
Ideal For
- Replacing the output transformer in a Fender Pro Reverb
- Bandmaster and Tremolux repair
- 40 W push-pull tube amp builds
- Adding 8 and 16 ohm speaker options to 4 ohm Fender designs
Overview
| Series | 1750 Series (Tube Guitar Amplifier - Output Transformers) |
| Product Type | Tube guitar amplifier output transformer |
| Manufacturer Description | Output transformer, guitar amp, 4,000 C.T. ohm pri., 4, 8, 16 ohm sec., 40W |
| Manufacturer Short Description | OUTPUT 40W PRO REVERB SEC=4OHM |
Dimensions
| Dimension A | 4.000 in ±0.063 |
| Dimension B | 2.80 in REF |
| Dimension C | 2.63 in MAX |
| Dimension D | 3.560 in ±0.063 |
| Mounting Slot G | 0.187 in ±0.015 |
Electrical
| Distortion | Less than 1% @ 70Hz |
| Power Rating | 40 W |
| Primary Leads | BRN, RED (4000 C.T.), BLU |
| Amplifier Type | Push-Pull |
| Primary Impedance | 4,000 ohms C.T. |
| Frequency Response | 70Hz - 15KHz (0/-1.5dB reference @ 1KHz) |
| Dielectric Strength | 1500VRMS |
| Secondary Impedance | 4, 8, 16 ohms |
| DCR Primary Brown-Blue | 185.0 ohms |
| DCR Secondary Black-Green | 0.356 ohm |
| DCR Secondary Black-White | 0.910 ohm |
| DCR Secondary Black-Yellow | 0.502 ohm |
| Leakage Inductance Brown-Blue (@ 1.0 KHz, 1.0 V SC) | 35.93mH |
| Inductance / Impedance Primary Brown-Blue (@ 1.0 KHz, 1.0 V OC) | 19.5H / 124K ohm |
Identifiers
| UPC | 623980252452 |
| UNSPSC | 39121301 |
Compatibility
| Fender Amps (Ref.) | Bandmaster*, Tremolux*, Pro* |
| Fender Chassis No. (Ref.) | Blonde, 6G7-A, Blackface, AA763, AB763, Silverface, AC568, AD1269, Blackface Reverb, Reverb, Reverb AA763, Silverface Reverb, Reverb AA1069, Reverb AA270 |
| Original Amp Manufacturer | Fender |
| Similar Fender P/N (Ref.) | 125A6A, 022848, 125A7A |
Packaging & Shipping
| Shipping Weight | 4 lbs (1.81 kg) |
Construction & Finish
| Leads | All leads 9 in long minimum |
| Style | Open style |
| Appearance | Constructed to look similar to original factory units (where possible) |
| Winding Type | Bobbin |
| Design Intent | Designed for drop in replacement of original units |
| Materials & Design | Material used and design specifications kept as close as possible to the original part to preserve the stock "tone" |
Environmental & Protection
| Temperature Range | -40 to 105 degC |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
Which Fender amps does the 1760J fit?▾
The series table lists the Bandmaster, Tremolux and Pro, similar to Fender P/Ns 125A6A, 022848 and 125A7A, across chassis including 6G7-A, AA763, AB763, AC568 and AD1269.
How does the 1760J differ from the 1750J?▾
The 1750J has a single 4 ohm secondary; the 1760J offers 4, 8 and 16 ohm taps. Both are 40 W, 4,000 ohm C.T., bobbin wound.
Which lead is the 4 ohm tap?▾
Green is 4 ohm, yellow 8 ohm, white 16 ohm and black common.
What is the frequency response?▾
70Hz to 15KHz, 0/-1.5dB referenced at 1KHz.
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