Hammond 1760CP 5W Paper-Wound Single-Ended Output Transformer
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Create Free Business AccountKey Features
- 5 W single-ended output transformer, 5,000/8,000 ohm primary
- 4 and 8 ohm secondaries
- Paper-wound for signature tonal characteristic
- For Fender Bronco and Champ (Ref. 125A35A, 022905, 125A3A)
- 40mA maximum primary DC current
- Frequency response 70Hz - 15KHz (0/-1dB), distortion under 1% at 70Hz
- Open style, minimum 9 in leads
- RoHS and REACH compliant
The 1760CP is a 5 watt single-ended output transformer for tube guitar amplifiers, listed for the Fender Bronco and Champ and similar to Fender part numbers 125A35A, 022905 and 125A3A. It suits technicians and restorers who want a drop in replacement with the tonal character of a paper-wound design.
It has a dual 5,000/8,000 ohm primary and 4 and 8 ohm secondaries, with a maximum primary DC current of 40mA. The drawing notes that it is paper-wound for signature tonal characteristic. Frequency response is 70Hz to 15KHz (0/-1dB referenced at 1KHz, 27dBu) and distortion is below 1% at 70Hz.
DC resistances are 357.8 ohms (primary red-brown), 117.5 ohms (primary brown-blue), 0.281 ohm (black-yellow) and 0.395 ohm (black-green). At 1.0 kHz, 1.0 V, primary red-brown measures 8.30H (58.6K ohm), primary red-blue 12.75H (88.0K ohm), black-yellow 10.68mH (124.1 ohm) and black-green 21.44mH (240.9 ohm). Leakage inductance is 13.12mH (red-brown) and 20.16mH (red-blue). Dielectric strength is 1500VRMS and the temperature range is -40 to 105 degC.
The open style design uses primary and secondary leads at least 9 in long. Drawing dimensions are A 2.813 in, B 1.560 in, C 1.683 in and D 2.375 in, with a 0.187 in slot. Shipping weight is 0.6 lbs (0.27 kg). The 1760CP is RoHS and REACH compliant.
Ideal For
- Replacing the output transformer in a Fender Champ or Bronco
- Single-ended 5 W tube amp builds
- Paper-wound tone upgrades for Champ-style circuits
Overview
| Series | 1750 Series (Tube Guitar Amplifier - Output Transformers) |
| Product Type | Tube guitar amplifier output transformer |
| Manufacturer Short Description | O/P 5W PRI=5/8K, SEC= 4/8 OHMS |
Dimensions
| Dimension A | 2.813 in ±0.063 |
| Dimension B | 1.560 in ±0.125 |
| Dimension C | 1.683 in ±0.063 |
| Dimension D | 2.375 in ±0.063 |
| Mounting Slot G | 0.187 in ±0.015 |
Electrical
| Distortion | Less than 1% @ 70Hz |
| Power Rating | 5 W |
| Amplifier Type | Single Ended |
| Primary Impedance | 5,000/8,000 ohms |
| Frequency Response | 70Hz - 15KHz (0/-1dB reference @ 1KHz, 27dBu) |
| Maximum Primary DC | 40mA |
| Dielectric Strength | 1500VRMS |
| Secondary Impedance | 4, 8 ohms |
| DCR Primary Red-Brown | 357.8 ohms |
| DCR Primary Brown-Blue | 117.5 ohms |
| DCR Secondary Black-Green | 0.395 ohm |
| DCR Secondary Black-Yellow | 0.281 ohm |
| Inductance / Impedance Primary Red-Blue | 12.75H / 88.0K ohm |
| Inductance / Impedance Secondary Black-Green | 21.44mH / 240.9 ohm |
| Inductance / Impedance Secondary Black-Yellow | 10.68mH / 124.1 ohm |
| Leakage Inductance Primary Red-Blue (@ 1.0 KHz, 1.0 V SC) | 20.16mH |
| Leakage Inductance Primary Red-Brown (@ 1.0 KHz, 1.0 V SC) | 13.12mH |
| Inductance / Impedance Primary Red-Brown (@ 1.0 KHz, 1.0 V OC) | 8.30H / 58.6K ohm |
Identifiers
| UPC | 623980436180 |
| UNSPSC | 39121301 |
Compatibility
| Fender Amps (Ref.) | Bronco*, Champ* |
| Fender Chassis No. (Ref.) | Blackface*, Silverface*, AA764, AB764 Tweed*, 5C1, 5E1, 5F1, Vibro Blackface* |
| Original Amp Manufacturer | Fender |
| Similar Fender P/N (Ref.) | 125A35A, 022905, 125A3A |
Packaging & Shipping
| Shipping Weight | 0.6 lbs (0.27 kg) |
Construction & Finish
| Leads | Minimum 9 in long primary and secondary leads |
| Style | Open style |
| Winding | Paper (paper-wound for signature tonal characteristic) |
| Appearance | Constructed to look similar to original factory units (where possible) |
| 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
What is the difference between the 1760CP and 1760C?▾
The 1760CP is paper wound with 4 and 8 ohm secondaries; the 1760C is bobbin wound with 3.2, 8 and 16 ohm secondaries. Both are 5 W single-ended with a 5,000/8,000 ohm primary.
Which Fender amps is the 1760CP listed for?▾
The Bronco and Champ, similar to Fender P/Ns 125A35A, 022905 and 125A3A.
What is the maximum primary DC current?▾
40mA.
What is the dielectric strength?▾
1500VRMS.
How long are the leads?▾
At least 9 in for both primary and secondary.
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