Hammond 1750C 5W Single-Ended Guitar Output Transformer, 3.2 Ohm
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- 5 W single-ended, 5000/8000 ohm primary, 3.2 ohm secondary
- Listed for Fender Champ, Bronco, Princeton, Vibro Champ, Harvard
- Similar to Fender P/Ns 125A35A, 022905, 125A3A
- Maximum primary DC 50 mA
- Bobbin winding, open style with 9" minimum leads
- 70 Hz to 15 kHz (0/-1.0 dB), distortion under 1% @ 70 Hz
The 1750C is a 5 watt single-ended output transformer for small tube guitar amplifiers. The 1750 series table lists it for the Fender Bronco, Champ, Princeton, Vibro Champ and Harvard, as similar to Fender part numbers 125A35A, 022905 and 125A3A, across chassis including Blackface, Silverface, AA764, AB764, Tweed, 5C1, 5E1, 5F1 and Vibro Blackface.
Its dual primary offers 5000 ohm (BRN lead) or 8000 ohm (BLU lead) taps against the RED lead, with a maximum primary DC of 50 mA, driving a 3.2 ohm secondary (YEL, with BLK common). It is bobbin wound and designed for drop in replacement of the original unit, constructed to look similar to the factory part where possible, with material and design specs 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 values: primary DCR 255.84 ohms (Red-Brown) and 73.89 ohms (Brown-Blue), secondary DCR 0.295 ohm; primary inductance 14.25 H (Red-Brown) and 20.42 H (Red-Blue); leakage inductance 54.28 mH and 74.48 mH. Dielectric strength is 1500 Vrms; temperature range -40 to 105 C.
The 1750C is an open style unit with minimum 9" long leads. Drawing dimensions are A 2.813" ±0.063, B 1.560" ±0.125, C 1.683" ±0.063, D 2.375" ±0.063 and G 0.187" ±0.015. Shipping weight is 0.65 lbs (0.29 kg). Made in Canada; RoHS and REACH compliant.
Ideal For
- Replacement output transformer for Fender Champ and Vibro Champ
- Fender Bronco, Princeton or Harvard repair
- 5 W single-ended tube guitar amps with 3.2 ohm speakers
- Tweed 5C1, 5E1 and 5F1 chassis restoration
Mounting
| Dimension G | 0.187" ±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, 5,000/8,000 ohm pri., 3.2 ohm sec., 5W |
| Manufacturer Short Description | OUTPUT 5W PRI=5/8K, SEC=3.2OHM |
Dimensions
| Dimension A | 2.813" ±0.063 |
| Dimension B | 1.560" ±0.125 |
| Dimension C | 1.683" ±0.063 |
| Dimension D | 2.375" ±0.063 |
Electrical
| Distortion | Less than 1% @ 70 Hz |
| Power Rating | 5 W |
| Amplifier Type | Single Ended |
| Primary Impedance | 5,000/8,000 ohms |
| Frequency Response | 70 Hz - 15 kHz (0/-1.0 dB reference @ 1 kHz) |
| Secondary Impedance | 3.2 ohms |
Identifiers
| UPC | 623980094106 |
| UNSPSC | 39121301 |
| Part Number | 1750C |
Compatibility
| Original Chassis Numbers | Blackface, Silverface, AA764, AB764 Tweed, 5C1, 5E1, 5F1, Vibro Blackface |
| Original Amp Manufacturer | Fender |
| Original Amplifier Models | Bronco Champ Princeton Vibro Champ Harvard |
| Similar Original Part Numbers | 125A35A, 022905, 125A3A |
Packaging & Shipping
| Shipping Weight | 0.65 lbs (0.29 kg) |
Construction & Finish
| Leads | Minimum 9" long primary and secondary leads (all leads 9" long min.) |
| Construction | Open style |
| Winding Type | Bobbin |
| Lead Colour Code | Primary: RED, BRN (5000 ohm), BLU (8000 ohm); Secondary: BLK (COM), YEL (3.2 ohm) |
Environmental & Protection
| Temperature Range | -40 to 105 C |
| Dielectric Strength | 1500 Vrms |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
Electrical (Typical, Drawing)
| Output Power | 5 W |
| Max Primary DC | 50 mA |
| Input Impedance | 5000/8000 Ohms |
| Output Impedance | 3.2 Ohms |
| DCR (Primary Red-Brown) | 255.84 Ohms |
| DCR (Primary Brown-Blue) | 73.89 Ohms |
| DCR (Secondary Black-Yellow) | 0.295 Ohm |
| Impedance (Primary Red-Blue, @ 1.0 KHz, 1.0 V OC) | 122.68 kOhm |
| Impedance (Primary Red-Brown, @ 1.0 KHz, 1.0 V OC) | 84.12 kOhm |
| Inductance (Primary Red-Blue, @ 1.0 KHz, 1.0 V OC) | 20.42 H |
| Inductance (Primary Red-Brown, @ 1.0 KHz, 1.0 V OC) | 14.25 H |
| Impedance (Secondary Black-Yellow, @ 1.0 KHz, 1.0 V OC) | 154.90 Ohm |
| Inductance (Secondary Black-Yellow, @ 1.0 KHz, 1.0 V OC) | 64.53 mH |
| Leakage Inductance (Primary Red-Blue, @ 1.0 KHz, 1.0 V SC) | 74.48 mH |
| Leakage Inductance (Primary Red-Brown, @ 1.0 KHz, 1.0 V SC) | 54.28 mH |
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Frequently Asked Questions
Which amplifiers is the 1750C listed for?▾
The Fender Bronco, Champ, Princeton, Vibro Champ and Harvard, similar to Fender P/Ns 125A35A, 022905 and 125A3A.
How do I select 5000 or 8000 ohms?▾
Per the drawing, the 5000 ohm tap is the BRN lead and the 8000 ohm tap is the BLU lead, with RED as the other primary connection.
What speaker impedance does it drive?▾
3.2 ohms, on the YEL lead with BLK common.
What is the maximum primary DC current?▾
50 mA.
How long are the leads?▾
All leads are 9" long minimum.
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