Hammond 1750D 100W Push-Pull Guitar Amp Output Transformer, 4/8/16
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Create Free Business AccountKey Features
- 100 W push-pull, 2350 ohm CT primary
- 4, 8 and 16 ohm secondary taps
- Built-in feedback winding, configurable to reduce noise and distortion
- Listed for Fender Tone Master and Twin Red Knob, similar P/N 26478
- Paper winding, open style with 12" leads (RED lead 25")
- 70 Hz to 15 kHz (0/-1.0 dB), distortion under 1% @ 70 Hz
The 1750D is a 100 watt push-pull output transformer for high-power tube guitar amplifiers. The 1750 series table lists it for the Fender Tone Master and Twin Red Knob, similar to Fender part number 26478, with a 2,350 ohm centre-tapped primary and 4, 8 and 16 ohm secondary taps. The winding type is paper.
A distinguishing feature is its built-in feedback winding, configurable to reduce noise and distortion (ORG-WHT, typical 0.025 ohm DCR). Like the rest of the series it is designed for drop in replacement of the original unit and constructed to look similar to the factory part where possible, with materials and design specifications kept close to the original to preserve the stock "tone".
The drawing rates frequency response at 70 Hz to 15 kHz (0/-1.0 dB reference @ 1 kHz) and distortion at less than 1% @ 70 Hz. Typical 1 kHz data: primary DCR 67.91 ohms (Brown-Blue); secondary DCR 0.300 ohm (Black-Grn/Yel), 0.690 ohm (Black-Green) and 0.860 ohm (Black-Yellow); primary inductance 10.2 H with 65 kOhm impedance; leakage inductance 5.66 mH. Dielectric strength is 2000 Vrms; temperature range -40 to 105 C.
The 1750D is an open style transformer with all leads 12" out minimum except the RED lead, which is 25" out minimum. Drawing dimensions are A 4.050" ±0.063, B 3.715" ±0.125, C 3.500" ±0.063, D 3.500" ±0.063, E 2.500" ±0.063 and F 3.020" ±0.063, with a G slot of 0.187" x 0.300" ±0.015. Shipping weight is 6.5 lbs (2.95 kg). Made in Canada; RoHS and REACH compliant.
Ideal For
- Replacement output transformer for Fender Tone Master amps
- Fender Twin Red Knob repair
- 100 W push-pull tube guitar amplifiers
- Guitar amps needing 4, 8 or 16 ohm speaker outputs
Mounting
| Dimension G | 0.187" x 0.300" ±0.015 |
Overview
| Series | 1750 Series, Tube Guitar Amplifier Output Transformers (Replacement & Upgrades) |
| Design Intent | Designed for drop in replacement of original units; constructed to look similar to original factory units (where possible); materials and design specs kept as close as possible to the original to preserve the stock "tone" |
| Manufacturer Description | Output transformer, guitar amp, 2350 ohm pri., 4, 8, 16 ohm sec., 100W |
| Manufacturer Short Description | CUSTOM TRANSFORMER 100W |
Dimensions
| Dimension A | 4.050" ±0.063 |
| Dimension B | 3.715" ±0.125 |
| Dimension C | 3.500" ±0.063 |
| Dimension D | 3.500" ±0.063 |
| Dimension E | 2.500" ±0.063 |
| Dimension F | 3.020" ±0.063 |
Electrical
| Distortion | Less than 1% @ 70 Hz |
| Power Rating | 100 W |
| Amplifier Type | Push-Pull |
| Feedback Winding | Built-in feedback winding configurable to reduce noise and distortion |
| Primary Impedance | 2,350 C.T. ohms |
| Frequency Response | 70 Hz - 15 kHz (0/-1.0 dB reference @ 1 kHz) |
| Secondary Impedance | 4, 8, 16 ohms |
Identifiers
| UPC | 623980252704 |
| UNSPSC | 39121301 |
| Part Number | 1750D |
Compatibility
| Original Amp Manufacturer | Fender |
| Original Amplifier Models | Tone Master Twin Red Knob |
| Similar Original Part Numbers | 26478 |
Packaging & Shipping
| Shipping Weight | 6.5 lbs (2.95 kg) |
Construction & Finish
| Leads | All leads 12.0" out min., except RED lead which is 25.0" out min. |
| Construction | Open style |
| Winding Type | Paper |
| Lead Colour Code | Primary: BRN, RED (CT), BLU; Secondary: BLK (COM), GRN/YEL (4 ohm), GRN (8 ohm), YEL (16 ohm); Feedback winding: ORG, WHT |
Environmental & Protection
| Temperature Range | -40 to 105 C |
| Dielectric Strength | 2000 Vrms |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
Electrical (Typical, Drawing)
| Output Power | 100 W |
| Input Impedance | 2350 Ohms |
| Output Impedance | 4, 8 & 16 Ohms |
| DCR (Primary Brown-Blue) | 67.91 Ohms |
| DCR (Secondary Black-Green) | 0.690 Ohm |
| DCR (Secondary Black-Yellow) | 0.860 Ohm |
| DCR (Secondary Black-Grn/Yel) | 0.300 Ohm |
| DCR (Feedback Winding Org-Wht) | 0.025 Ohm |
| Impedance (Primary Brown-Blue, @ 1.0 KHz, 1.0 V OC) | 65 kOhm |
| Inductance (Primary Brown-Blue, @ 1.0 KHz, 1.0 V OC) | 10.2 H |
| Leakage Inductance (Brown-Blue, @ 1.0 KHz, 1.0 V SC) | 5.66 mH |
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Frequently Asked Questions
Which amplifiers is the 1750D listed for?▾
The Fender Tone Master and Twin Red Knob, similar to Fender part number 26478.
What is the feedback winding for?▾
The built-in feedback winding (ORG-WHT leads) is configurable to reduce noise and distortion.
What speaker impedances are available?▾
4 ohms (GRN/YEL), 8 ohms (GRN) and 16 ohms (YEL), with BLK as common.
How long are the leads?▾
All leads are 12.0" out minimum, except the RED lead which is 25.0" out minimum.
How much does it weigh?▾
The shipping weight is 6.5 lbs (2.95 kg).
