5W single ended output transformer

2021 UPDATE: This TX is used in Amp Maker kits and has also been a popular choice for other amp builders. It’s no longer available to buy from Amp Maker, but you can order it directly from the TX maker, Primary Windings Ltd

This output transformer is made in England by a traditional and long-standing transformer winding company. It’s designed for use in single-ended EL84 valve output stages, and will also work well with 6V6 valves. The primary impedance is 5k ohms and it has 4, 8 and 16 ohm speaker taps. It’s clamp-mounting, with standard solder lugs for primary and secondary connections. For those who worry about such things, the transformer uses grain-oriented laminations. Audio performance is equal to equivalent Hammond SE output transformers, -1dB at 100Hz with no negative feedback, and flat frequency response to well over 10kHz. It sounds fantastic for both medium- and high-gain guitar circuits.

Dimensions & info

This output transformer is 60mm wide, 55mm deep and 50mm tall. Fixing centres for the U-clamp mounting feet are 75mm apart. It’s rated at 5-7W output, with a primary impedance of 5k ohms. It comes with an insulating sleeve that you slip over the primary’s solder lugs to prevent accidental touches of the high voltage supply. The transformer has secondary taps for 4, 8 and 16 ohm speaker load.