Guitar Amp Output Transformer Replacements
Author: kevinm Date Posted:14 August 2017
Hammond Replacement Output Transformers
This is a list of output transformers designed by Hammond and ranged by Evatco. We find these to be great quality and value.
Drop-in Replacement
Designed for drop-in replacement of original units.
Vintage Appearance
Physically, parts were designed to look similar to original factory units (where possible).
Preserved Stock Tone
Material used & design specs were kept as close as possible to the original part to preserve the stock "tone".
Output Transformers Directory
| Hammond Part Number |
Primary (Ohms) |
Secondary (Ohms) |
Amp Type |
Power (Watts) |
Construction Bobbin / Paper |
Amplifier Model Names |
Equivalent To Mfr Part No. |
|---|---|---|---|---|---|---|---|
| Fender (Output Transformers) | |||||||
| 1750A | 22,800 | 8 | Single Ended | 3.5 | Bobbin | Reverb Driver | 125A20B & 022921 |
| 1750AX New | 7,500 | 8 | Single Ended | 3.5 | Bobbin | 6G15 Reverb | 125A12A, 47605 |
| 1750B | 5,482 | 8 | Single Ended | 10 | Paper | Reverb Driver - Vibro King | 24038 |
| 1750C | 5,000 / 8,000 | 3.2 | Single Ended | 5 | Bobbin | (Bronco, AA764, AB764, Blackface, Silverface) (Champ, Tweed, 5C1, 5E1, 5F1, AA764, Blackface, Silverface, Vibro Blackface) (Harvard, 6G10) (Princeton Tweed, 5B2, 5C2, 5D2, 5E2, 5F2, 5F2A) | 125A35A & 022905 |
| 1760C | 5,000 / 8,000 | UPGRADE 3.2, 8, 16 | Single Ended | 5 | Bobbin | (Bronco, AA764, AB764, Blackface, Silverface) (Champ, Tweed, 5C1, 5E1, 5F1, AA764, Blackface, Silverface, Vibro Blackface) (Harvard, 6G10) (Princeton Tweed, 5B2, 5C2, 5D2, 5E2, 5F2, 5F2A) | 125A35A & 022905 |
| 1750E | 8,500 C.T. | 8 | Push-Pull | 15 | Bobbin | (Harvard 5F10) (Princeton Brown, AA964, Blackface, Silverface) (Princeton Reverb AA1164, AA764, B1270, Blackface, Silverface) | 125A10B & 022913 |
| 1760E | 8,500 C.T. | UPGRADE 4, 8, 16 | Push-Pull | 15 | Bobbin | (Harvard 5F10) (Princeton Brown, AA964, Blackface, Silverface) (Princeton Reverb AA1164, AA764, B1270, Blackface, Silverface) | 125A10B & 022913 |
| 1750F | 6,950 C.T. | 8 | Push-Pull | 15 | Paper | Blues Junior | 49969 |
| 1760F | 6,950 C.T. | UPGRADE 4, 8, 16 | Push-Pull | 15 | Paper | Blues Junior | 49969 |
| 1750H | 6,600 C.T. | 8 | Push-Pull | 20 | Paper | Deluxe, Deluxe Reverb | 125A1A & 022640 |
| 1760H | 6,600 C.T. | UPGRADE 4, 8, 16 | Push-Pull | 20 | Paper | Deluxe, Deluxe Reverb | 125A1A & 022640 |
| 1750J | 4,000 C.T. | 4 | Push-Pull | 40 | Bobbin | Pro-Reverb, Tremolux, Vibrolux, Vibroverb | 125A6A, 125A7A & 022848 |
| 1760J | 4,000 C.T. | UPGRADE 4, 8, 16 | Push-Pull | 40 | Bobbin | Pro-Reverb, Tremolux, Vibrolux, Vibroverb | 125A6A, 125A7A & 022848 |
| 1750JA | 4,250 C.T. | 4, 8 | Push-Pull | 40 | Paper | Hot Rod Deluxe | 50438 |
| 1760JB | 6,000 C.T. | 2.67, 4, 8 | Push-Pull | 40 | Bobbin | Bandmaster Tweed, Pro Tweed, Super Brownface, Super Tweed | 045216, 1846, 1848 |
| 1750K | 4,000 C.T. | 2 | Push-Pull | 50 | Paper | Tweed Bassman, Super Reverb | 125A9A & 022855 |
| 1760K | 4,000 C.T. | UPGRADE 2, 4, 8 | Push-Pull | 50 | Paper | Tweed Bassman, Super Reverb | 125A9A & 022855 |
| 1750KA | 4,150 C.T. | 2 | Push-Pull | 50 | Paper | 59 Bassman | 36485 |
| 1750M | 4,200 C.T. | 2, 4, 8 | Push-Pull | 60 | Paper | General Replacement | 125A13A & 022871 |
| 1750L | 4,200 C.T. | 4 | Push-Pull | 60 | Paper | Bassman, Hot Rod Deville | 125A13A & 022871 |
| 1760L | 4,200 C.T. | 4, 8, 16 | Push-Pull | 60 | Paper | Bassman, Hot Rod Deville | 125A13A, 022871, 048832 |
| 1750W | 2,000 C.T. | 4 | Push-Pull | 100 | Paper | Dual Showman, Twin Reverb, Super Six | 125A29A & 022889 |
| 1760W | 2,000 C.T. | UPGRADE 4, 8, 16 | Push-Pull | 100 | Paper | Dual Showman, Twin Reverb, Super Six | 125A29A & 022889 |
| 1750D | 2,350 C.T. | 4, 8, 16 | Push-Pull | 100 | Paper | Tone Master | 26478 |
| 1750WR | 2,000 C.T | 4, 8 | Push-Pull | 135 | Paper | Bassman 135, Twin Reverb, Vibrosonic Reverb | 13691 |
| Marshall (Output Transformers) | |||||||
| 1750PA | 8,400 C.T. | 4, 8, 16 | Push-Pull | 18 | Bobbin | 18 Watt Combo | — |
| 1750Q | 6,000 C.T. | 4, 8, 16 | Push-Pull | 30 | Bobbin | JTM30 | — |
| 1750NA | 8,000 C.T. | 8, 16 | Push-Pull | 30 | Bobbin | J30 | — |
| 1750MA | 8,000 C.T. | 8, 16 | Push-Pull | 45 / 50 | Bobbin | JTM45 | — |
| 1750G | 3,400 C.T. | 4, 8, 16 | Push-Pull | 50 | Paper | JCM 800 | — |
| 1750X | 3,200 C.T. | 4, 8, 16 | Push-Pull | 50 | Paper | JCM 900 | — |
| 1750H | 1,700 C.T. | 4, 8, 16 | Push-Pull | 100 | Paper | JCM 800 | — |
| 1750U | 1,700 C.T. | 4, 8, 16 | Push-Pull | 100 | Paper | JCM 900 | — |
| Vox (Output Transformers) | |||||||
| 1750P | 6,200 C.T. | 8, 16 | Push-Pull | 15 | Bobbin | AC15 | — |
| 1750V | 4,000 C.T. | 8, 16 | Push-Pull | 30 | Paper | AC30 Reissue | — |
| 1750T | 4,000 C.T. | 8, 16 | Push-Pull | 30 | Paper | AC30 Vintage | — |
| Gibson (Output Transformers) | |||||||
| 1750GA | 5,000 / 8,000 | 3.2, 8, 16 | Single Ended | 5 | Bobbin | GA-5, Les Paul Junior | — |
| Ampeg (Output Transformers) | |||||||
| 1750AMP | 4,000 C.T. | 2, 4, 8 | Push-Pull | 100 | Paper | SVT, V4 | — |
| Traynor (Output Transformers) | |||||||
| 1750TR | 4,200 C.T. | 4, 8 | Push-Pull | 45 | Paper | YBA-1 Bass Master | — |
Hammond Mfg. is not affiliated with Fender, Marshall, Vox, Gibson, Ampeg or Traynor. Amplifier model names are trademarks of their respective owners and are listed for reference purposes only. Output transformers marked UPGRADE allow for extra speaker output impedance choices.
