Hammond 1750AB 12W 9K CT Push-Pull Guitar Amp Output Transformer
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Create Free Business AccountKey Features
- 12 W push-pull, 9000 ohm CT primary, 8 ohm secondary
- Listed for Fender Musicmaster Bass, similar to Fender P/N 26839
- Designed for drop in replacement of the original unit
- Bobbin winding, open style with 9" minimum leads
- 70 Hz to 15 kHz (0/-1 dB ref. 1 kHz)
- Distortion less than 2% @ 70 Hz
The 1750AB is a 12 watt push-pull output transformer for tube guitar and bass amplifiers. The 1750 series table lists it for the Fender Musicmaster Bass, similar to Fender part number 26839, with a 9000 ohm centre-tapped primary and an 8 ohm secondary.
It is designed for drop in replacement of the original unit and constructed to look similar to the original factory part where possible. Materials and design specifications were kept as close as possible to the original part to preserve the stock "tone". The winding type is bobbin.
Rated frequency response is 70 Hz to 15 kHz (0/-1 dB reference @ 1 kHz), with distortion of less than 2% @ 70 Hz. Typical drawing values at 1 kHz include primary DCR of 146.9 ohms (Brown-Red) and 161.9 ohms (Red-Blue), secondary DCR of 0.307 ohm, primary inductance of 8.74 H with 54.24 kOhm impedance, secondary inductance of 15.76 mH with 111.46 ohm impedance, and 5.96 mH primary leakage inductance (Brown-Blue). Dielectric strength is 2000 Vrms; temperature range -40 to 105 C.
The 1750AB is an open style transformer with minimum 9" long primary and secondary leads: BRN and BLU plate leads with a RED centre tap on the primary, and BLK (common) and GRN (8 ohm) on the secondary. Drawing dimensions are A 3.250" ±0.063, B 2.063" ±0.125, C 1.995" ±0.063 and D 2.813" ±0.063, with G 0.187" ±0.015. Shipping weight is 0.4 lbs. Made in Canada; RoHS and REACH compliant.
Ideal For
- Replacement output transformer for Fender Musicmaster Bass amps
- 12 W push-pull tube guitar or bass amplifier repair
- Restoration keeping the stock tone of the original unit
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, 9000 ohm pri., 8 ohm sec., 12W |
| Manufacturer Short Description | OUTPUT TRANS |
Dimensions
| Dimension A | 3.250" ±0.063 |
| Dimension B | 2.063" ±0.125 |
| Dimension C | 1.995" ±0.063 |
| Dimension D | 2.813" ±0.063 |
Electrical
| Distortion | Less than 2% @ 70 Hz |
| Power Rating | 12 W |
| Amplifier Type | Push-Pull |
| Primary Impedance | 9000 C.T. ohms |
| Frequency Response | 70 Hz - 15 kHz (0/-1 dB reference @ 1 kHz) |
| Secondary Impedance | 8 ohms |
Identifiers
| UPC | 623980474854 |
| UNSPSC | 39121301 |
| Part Number | 1750AB |
Compatibility
| Original Amp Manufacturer | Fender |
| Original Amplifier Models | Musicmaster Bass |
| Similar Original Part Numbers | 26839 |
Packaging & Shipping
| Shipping Weight | 0.4 lbs (0.18 kg) |
Construction & Finish
| Leads | Minimum 9" long primary and secondary leads |
| Construction | Open style |
| Winding Type | Bobbin |
| Lead Colour Code | Primary: BRN, RED (CT), BLU; Secondary: BLK (COM), GRN (8 ohm) |
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 | 12 W |
| Input Impedance | 9000 Ohms |
| Output Impedance | 8 Ohms |
| DCR (Primary Red-Blue) | 161.9 Ohms |
| DCR (Primary Brown-Red) | 146.9 Ohms |
| DCR (Secondary Black-Green) | 0.307 Ohm |
| Impedance (Primary Brown-Red, @ 1.0 KHz, 1.0 V OC) | 54.24 kOhm |
| Inductance (Primary Brown-Red, @ 1.0 KHz, 1.0 V OC) | 8.74 H |
| Impedance (Secondary Black-Green, @ 1.0 KHz, 1.0 V OC) | 111.46 Ohm |
| Inductance (Secondary Black-Green, @ 1.0 KHz, 1.0 V OC) | 15.76 mH |
| Leakage Inductance (Primary Brown-Blue, @ 1.0 KHz, 1.0 V SC) | 5.96 mH |
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Frequently Asked Questions
Which amplifier is the 1750AB listed for?▾
The Fender Musicmaster Bass; it is listed as similar to Fender part number 26839.
What are the primary and secondary impedances?▾
9000 ohms centre-tapped primary and 8 ohm secondary.
Is it push-pull?▾
Yes, it is a push-pull output transformer rated 12 W.
What lead length does it have?▾
Minimum 9" long primary and secondary leads.
What is the distortion rating?▾
Less than 2% at 70 Hz.
