Hammond 290EX 120V Blackface Bandmaster/Bassman Power Transformer

The 290EX is a paper-wound power transformer in the Hammond 290 Series, listed as a replacement for Fender guitar amplifiers. It is aimed at technicians and restorers working on Blond, Brownface, Blackface and Silverface era amps on 120V mains.

The part page rates the primary at 120V, and the ordering table lists 120V @ 60 Hz for the Bassman and Concert entries. Secondaries are 660Vct @ 275 mA (short description 330-0-330), a 53V bias winding, and a heater winding listed as 6.3Vct @ 4A on the part page and 6.4Vct @ 4A in the ordering table. There is no separate winding listed.

Reference listings cover the BANDMASTER (Blond, 6G7-A, Blackface, AA763, AB763, Silverface, AC568, AD1269), the BASSMAN (Blackface, AA864, AA165, AB165, Silverface, AA270) and the CONCERT (Brownface, 6G12A, Blackface, AA763). Similar amp part numbers are 67233, 125P7D, 125P7DX and 022814. All model data is for reference only.

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 290EX ships at 7.65 lbs (3.47 kg), is RoHS and REACH compliant, and carries UPC 623980094083 and UNSPSC 39121301. The 290EEX is the multi-voltage version.