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 15W output transformer is a natural step-up from 5W type(which is designed for a single EL84/6V6): it’s designed for use with larger and higher output octal power valves. It has a 3kohm primary and three secondary taps. It has clamp-type mounting and comes with flying leads (300mm long). It’s made in Britain.
Dimensions & info
This output transformer is 78mm wide, 70mm deep and 65mm tall. Fixing centres for the U-clamp mounting feet are 96mm apart. 3k ohms into 4, 8 or 16 ohms. Inductance is 2.5H at 1KHz and leakage inductance is 6mH.