Hammond 1760JB 40W Output Transformer for Tweed Bandmaster Amps
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Create Free Business AccountKey Features
- 40 W push-pull output transformer, 6,000 ohm C.T. primary
- 2.67, 4 and 8 ohm secondaries
- For Fender Tweed Bandmaster (Ref. 45216, 1846, 1848)
- Bobbin wound
- Frequency response 70Hz - 15KHz (0/-1dB), 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 1760JB is a 40 watt push-pull output transformer for tube guitar amplifiers, listed for the Fender Bandmaster with a Tweed chassis reference and similar to Fender part numbers 45216, 1846 and 1848. It is a drop in replacement for technicians and restorers working on tweed Bandmaster amplifiers.
Its 6,000 ohm center-tapped primary drives 2.67, 4 and 8 ohm secondaries, and it is bobbin wound. Typical frequency response is 70Hz to 15KHz (0/-1dB referenced at 1KHz), with distortion under 1% at 70Hz. DC resistance is 114.0 ohms (primary brown-blue), 0.135 ohm (black-violet), 0.160 ohm (black-green) and 0.274 ohm (black-yellow). At 1.0 kHz, 1.0 V the primary measures 7.65 H (48.5 K ohm); secondaries measure 8.438 mH (126 ohm) black-violet, 12.765 mH (180.05 ohm) black-green and 27.76 mH (334.5 ohm) black-yellow. Leakage inductance brown-blue is 21.69 mH.
Dielectric strength is 1500VRMS and the temperature range is -40 to 105 degC. The open style design has all leads at least 9 in long: brown, red (center tap) and blue on the primary; black (common), violet (2.67 ohm), green (4 ohm) and yellow (8 ohm) on the secondary. Materials and design specifications follow the original to preserve the stock tone.
Drawing dimensions are A 4.00 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 1760JB is RoHS and REACH compliant.
Ideal For
- Replacing the output transformer in a Fender Tweed Bandmaster
- Tweed-era 40 W push-pull amp restoration
- Amps driving 2.67, 4 or 8 ohm speaker loads
Overview
| Series | 1750 Series (Tube Guitar Amplifier - Output Transformers) |
| Product Type | Tube guitar amplifier output transformer |
| Manufacturer Description | Output transformer, guitar amp, 6,000 C.T. ohm pri., 2.67, 4, 8 ohm sec., 40W |
| Manufacturer Short Description | OUTPUT 40W , SEC=2.6/4/8 OHM |
Dimensions
| Dimension A | 4.00 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 (6000 C.T.), BLU |
| Amplifier Type | Push-Pull |
| Primary Impedance | 6,000 ohms C.T. |
| Frequency Response | 70Hz - 15KHz (0/-1dB reference @ 1KHz) |
| Dielectric Strength | 1500VRMS |
| Secondary Impedance | 2.67, 4, 8 ohms |
| DCR Primary Brown-Blue | 114.0 ohms |
| DCR Secondary Black-Green | 0.160 ohm |
| DCR Secondary Black-Violet | 0.135 ohm |
| DCR Secondary Black-Yellow | 0.274 ohm |
| Inductance / Impedance Secondary Black-Green | 12.765 mH / 180.05 ohm |
| Inductance / Impedance Secondary Black-Violet | 8.438 mH / 126 ohm |
| Inductance / Impedance Secondary Black-Yellow | 27.76 mH / 334.5 ohm |
| Leakage Inductance Brown-Blue (@ 1.0 KHz, 1.0 V SC) | 21.69 mH |
| Inductance / Impedance Primary Brown-Blue (@ 1.0 KHz, 1.0 V OC) | 7.65 H / 48.5 K ohm |
Identifiers
| UPC | 623980186184 |
| UNSPSC | 39121301 |
Compatibility
| Original Amp Manufacturer | Fender |
| Amp Model Name (Ref. Only) | Bandmaster* |
| OEM Chassis Number (Ref. Only) | Tweed |
| Similar To OEM Part Number (Ref. Only) | 45216, 1846, 1848 |
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 amplifier is the 1760JB for?▾
The Fender Bandmaster with a Tweed chassis reference, similar to Fender P/Ns 45216, 1846 and 1848.
What secondary impedances does it offer?▾
2.67, 4 and 8 ohms, on violet, green and yellow leads with black as common.
What is the primary impedance?▾
6,000 ohms center-tapped.
Is the 1760JB paper or bobbin wound?▾
Bobbin wound.
What is the dielectric strength?▾
1500VRMS.
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