Hammond 290REX Twin Red Knob Multi-Voltage Power Transformer

The 290REX is a Hammond 290 Series power transformer listed as a replacement for the Fender TWIN RED KNOB. It is aimed at technicians and owners servicing this amp on a range of mains voltages.

The primary is rated 100/120/220/240V @ 50/60 Hz (short description 100/120 220/240V). Secondaries are 337Vct @ 1.1A for the high-voltage supply, 54V @ 250 mA and 6.4V @ 3A. The ordering table lists bobbin winding.

Hammond designed the 290 Series for drop-in replacement of original units, with parts made to look similar to the original factory transformers where possible and materials and design specs kept as close as possible to the original part to preserve the stock tone.

The high-voltage winding is centre-tapped at 337V and rated 1.1A, and the four-tap primary means one part can be wired for 100V, 120V, 220V or 240V supplies. Check which tap matches your mains and compare the listed secondaries with the original transformer or schematic before installing, since the amp model reference is published for reference only.

The 290REX ships at 14.75 lbs (6.69 kg), is RoHS and REACH compliant, and is identified by UPC 623980284262 and UNSPSC 39121301. The amp model is listed for reference only, so confirm your chassis before ordering.