Fender Twin Red Knob* Guitar Amp Replacement Transformers


  • Fender “The Twin” Red Knob*, 25/100 Watt
  • Physically, parts were designed to look similar to original factory units (where possible).
  • Material used & design specs. were kept as close as possible to the original part to preserve the stock “tone”.
  • See drawing for specifications and size.
  • Do you know of any models we don’t list? If so please contact us for information.
  • DISCLAIMER: * Hammond Mfg. or Digi-Key is not affiliated with Fender Musical Instruments Corp. Amplifier model names are trademarks of the Amplifier companies and are just listed here for reference purpose only.

Power Transformer Domestic 120V, 60 Hz.

Part No. HM5049-ND (290RX)

Used in “The Twin” Red Knob
Fender No: 26477
Core: Paper

Power Transformer International 100/120/220/240V, 50/60 Hz.

Part No. 290REX
-If clicking on the part doesn’t bring you to the product page, it may be a special order item. Click here for special order form to have the part specially ordered.

Used in “The Twin” Red Knob
Fender No: 26477
Core: Paper

Output Transformer - 4, 8, 16 Ohms

Part No. HM4558-ND (1750D)

Used in Twin Red Knob* chassis:

Fender No: 26478
Core: Paper

The TechForum Cross Reference category is for parts that Digi-Key does not sell or parts that have gone obsolete. Our Engineers and Techs have reviewed the specifications for these parts and made a recommendation for a replacement. Please review the suggested part to ensure it will work for your application.