Hammond 1760L 60W Push-Pull Output Transformer for Bassman Amps
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Create Free Business AccountKey Features
- 60 W (50/60W per drawing) push-pull output transformer
- 4,200 ohm C.T. primary with 4, 8 and 16 ohm secondaries
- For Fender Bassman, Hot Rod Deville, Concert II (Ref. 022871, 125A13A)
- Paper wound
- Frequency response 70Hz - 15KHz (0/-1dB), distortion under 2% at 70Hz
- 2828VDC dielectric strength, -40 to 105 degC
- Open style, all leads 9.0 in out minimum
- RoHS and REACH compliant
The 1760L is a 60 watt push-pull output transformer for tube guitar amplifiers, listed for the Fender Bassman, Hot Rod Deville and Concert II and similar to Fender part numbers 022871 and 125A13A. Chassis references include 5F6, 5F6A, 10, Blackface, AA864, AA165, AB165, Silverface and AA270, making it a drop in option for technicians across several Bassman generations.
It is paper wound with a 4,200 ohm center-tapped primary and 4, 8 and 16 ohm secondaries; the drawing marks the output power as 50/60W. Frequency response is 70Hz to 15KHz (0/-1dB referenced at 1KHz) with distortion under 2% at 70Hz. DC resistance is 46.48 ohm (primary brown-red), 51.04 ohm (primary red-blue), 0.238 ohm (green-black), 0.405 ohm (green-yellow) and 0.578 ohm (green-white). At 1.0 kHz, 1.0 V the primary measures 5.72 H (36.4 K ohm); secondaries measure 9.31 mH (66.26 ohm), 18.15 mH (126.85 ohm) and 34.23 mH (233.5 ohm). Primary leakage inductance is 3.506 mH.
Dielectric strength is 2828VDC and the temperature range is -40 to 105 degC. On this part the secondary common is the green lead, with black for 4 ohm, yellow for 8 ohm and white for 16 ohm; the primary uses brown, red (center tap) and blue. All leads come out at least 9.0 in.
Drawing dimensions are A 4.063 in, B 3.150 in, C 3.500 in, D 3.500 in, E 1.955 in and F 2.480 in, with 0.180 x 0.300 in slots. Shipping weight is 4 lbs (1.81 kg). The 1760L is RoHS and REACH compliant.
Ideal For
- Replacing the output transformer in a Fender Bassman head
- Hot Rod Deville and Concert II repair
- 5F6-A and AA165 Bassman restoration
- 50/60 W push-pull tube amp builds
Overview
| Series | 1750 Series (Tube Guitar Amplifier - Output Transformers) |
| Product Type | Tube guitar amplifier output transformer |
| Manufacturer Description | Output transformer, guitar amp, 4,200 C.T. ohm pri., 4, 8, 16 ohm sec., 60W |
| Manufacturer Short Description | OUTPUT50W BASSMAN HEADSEC=4OHM |
Dimensions
| Dimension A | 4.063 in ±0.063 |
| Dimension B | 3.150 in ±0.125 |
| Dimension C | 3.500 in ±0.063 |
| Dimension D | 3.500 in ±0.063 |
| Dimension E | 1.955 in ±0.063 |
| Dimension F | 2.480 in ±0.063 |
| Mounting Slot G | 0.180 in x 0.300 in ±0.015 |
Electrical
| Distortion | Less than 2% @ 70Hz |
| Power Rating | 60 W |
| Primary Leads | BLU, RED (4200 C.T.), BRN |
| Amplifier Type | Push-Pull |
| Primary Impedance | 4,200 ohms C.T. |
| Frequency Response | 70Hz - 15KHz (0/-1dB reference @ 1KHz) |
| Dielectric Strength | 2828VDC |
| Secondary Impedance | 4, 8, 16 ohms |
| DCR Primary Red-Blue | 51.04 ohm |
| DCR Primary Brown-Red | 46.48 ohm |
| Output Power (Drawing) | 50/60W |
| DCR Secondary Green-Black | 0.238 ohm |
| DCR Secondary Green-White | 0.578 ohm |
| DCR Secondary Green-Yellow | 0.405 ohm |
| Inductance / Impedance Secondary Green-Black | 9.31 mH / 66.26 ohm |
| Inductance / Impedance Secondary Green-White | 34.23 mH / 233.5 ohm |
| Inductance / Impedance Secondary Green-Yellow | 18.15 mH / 126.85 ohm |
| Leakage Inductance Primary Brown-Blue (@ 1.0 KHz, 1.0 V SC) | 3.506 mH |
| Inductance / Impedance Primary Brown-Blue (@ 1.0 KHz, 1.0 V OC) | 5.72 H / 36.4 K ohm |
Identifiers
| UPC | 623980252476 |
| UNSPSC | 39121301 |
Compatibility
| Fender Amps (Ref.) | Bassman*, Hot rod Deville*, Concert II* |
| Fender Chassis No. (Ref.) | 5F6, 5F6A, 10, Blackface, AA864, AA165, AB165, Silverface, AA270 |
| Original Amp Manufacturer | Fender |
| Similar Fender P/N (Ref.) | 022871, 125A13A |
Packaging & Shipping
| Shipping Weight | 4 lbs (1.81 kg) |
Construction & Finish
| Leads | All leads 9.0 in out minimum |
| Style | Open style |
| Appearance | Constructed to look similar to original factory units (where possible) |
| Winding Type | Paper |
| 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 is the 1760L listed for?▾
The Bassman, Hot Rod Deville and Concert II, similar to Fender P/Ns 022871 and 125A13A, with chassis references including 5F6, 5F6A, AA864, AA165, AB165 and AA270.
Which lead is the secondary common?▾
On the 1760L the green lead is common; black is 4 ohm, yellow 8 ohm and white 16 ohm.
What power rating does it carry?▾
The part page lists 60 W; the drawing marks output power as 50/60W.
How does it differ from the 1750L?▾
The 1750L has a single 4 ohm secondary; the 1760L provides 4, 8 and 16 ohm taps. Both use a 4,200 ohm C.T. primary and paper winding.
What is the dielectric strength?▾
2828VDC.
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