Hammond 290ETX Ampeg Super Echo Twin PT-109 Power Transformer

The 290ETX is a Hammond 290 Series power transformer listed as a replacement for an Ampeg guitar amp. In the AMPEG section of the ordering table it is shown for the SUPER ECHO TWIN and listed as equivalent to Ampeg part number PT-109. It is aimed at technicians and collectors restoring this amplifier.

The published rating is a 120 VAC 60 Hz primary, and the ordering table lists it as bobbin wound. Secondary voltages and currents are not published for this part, so compare against the original PT-109 or your amp schematic before installing.

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.

Because the ordering table gives the Ampeg part number it is equivalent to, the PT-109 marking on the original transformer is a practical way to confirm you have the right replacement before ordering.

The 290ETX ships at 7.65 lbs (3.47 kg). It is RoHS and REACH compliant and identified by UPC 623980930695 and UNSPSC 39121301. The part page labels the amp model and similar part number as reference only.