Hammond 290RX Twin Red Knob 120V Replacement Power Transformer
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Create Free Business AccountKey Features
- Replacement power transformer for the Fender TWIN RED KNOB (ref. P/N 26477)
- 120V @ 60 Hz primary
- 337Vct @ 1.1A high voltage secondary
- 54V @ 250 mA and 6.4V @ 3A secondary windings
- Paper winding per the series ordering table
- Designed for drop in replacement and a similar look to the factory unit
- 14.75 lbs (6.69 kg) shipping weight; RoHS and REACH compliant
The 290RX is a tube guitar amplifier power transformer from the 290 Series, listed as a replacement for the Fender TWIN RED KNOB (similar amp P/N 26477, reference only). It is aimed at amp technicians, restorers and players who need to replace the mains transformer in a 120V Twin Red Knob chassis.
Its primary is rated 120V @ 60 Hz. The high voltage secondary is 337Vct @ 1.1A, with a 54V @ 250 mA winding (Secondary 3) and a 6.4V @ 3A winding (Secondary 4). The manufacturer's short description summarises the part as 352VCT AC/56VAC/6.3VAC. The series ordering table lists the winding type as paper.
As with every part in the 290 Series, the 290RX was designed for drop in replacement of the original unit, physically designed to look similar to the original factory transformer where possible, and built with materials and design specs kept as close as possible to the original part to preserve the stock tone.
Listed shipping weight is 14.75 lbs (6.69 kg). The part is RoHS and REACH compliant, and carries UPC 623980252629 and UNSPSC 39121301. Amp model and similar part numbers are provided for reference only, so confirm your amplifier's existing transformer ratings before ordering the 290RX.
Ideal For
- Fender TWIN RED KNOB power transformer replacement
- 120V tube guitar amplifier repair
- Amp restoration preserving stock tone
Overview
| Series | 290 Series (Tube Guitar Amplifier - Power Transformers, Replacement & Upgrades) |
| Product Type | Power transformer, replacement for Fender guitar amp, 290 series |
| Short Description | 352VCT AC/56VAC/6.3VAC |
Electrical
| Secondary 1 | 337Vct @ 1.1A |
| Secondary 3 | 54V @ 250 mA |
| Secondary 4 | 6.4V @ 3A |
| Primary Volts | 120V @ 60 Hz |
Identifiers
| UPC | 623980252629 |
| UNSPSC | 39121301 |
Amplifier Reference
| Amp Manufacturer | Fender |
| Amp Model (Ref. Only) | TWIN RED KNOB* |
| Similar Amp P/N's (Ref. Only) | 26477 |
Packaging & Shipping
| Shipping Weight | 14.75 lbs (6.69 kg) |
Construction & Finish
| Winding | Paper |
| Appearance | Designed to look similar to original factory units (where possible) |
| Design Intent | Designed for drop in replacement of original units |
| Materials & Design Specs | Kept as close as possible to the original part to preserve the stock "tone" |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
Which amplifier is the 290RX listed for?▾
It is listed as a replacement power transformer for the Fender TWIN RED KNOB, with similar amp P/N 26477. The amp model and part number are given for reference only.
What primary voltage does the 290RX take?▾
The primary is rated 120V @ 60 Hz.
What are the 290RX secondary ratings?▾
Secondary 1 is 337Vct @ 1.1A, Secondary 3 is 54V @ 250 mA and Secondary 4 is 6.4V @ 3A.
Is the 290RX paper or bobbin wound?▾
The series ordering table lists the winding as paper.
How heavy is the 290RX?▾
The listed shipping weight is 14.75 lbs (6.69 kg).
