OT02 came from my search for an output transformer for my PP-18 amp kit (a stripped-down version of the classic Marshall 18W amp of the '60s). There were some British OTs available off-the-shelf (supposedly made for Marshall in recent years), but they seem designed down to a size - as if to fit into a 1U rack mount box - and they didn't sound very good when the amp was pushed. There were also several higher-cost US-made OTs for the 18Wer, including the Heyboer, which I liked (except for the cost of shipping and importing). With no decent and affordable output transformer available, I got one made.
We started by taking that Heyboer apart and making several variations on the theme. After a tone test, I settled on the best-sounding version (which happens to have grain-oriented laminations).
It's designed for use in a typical 2 x EL84 valve power amp, but would work fine in any push-pull output stage of 15-20W that requires an 8k ohms primary impedance. It has 8 and 16 ohm speaker taps. It's clamp-mounting, with standard solder lugs for all connections.
Dimensions & info Wound by the same British company that does all of the Amp Maker transformers, this output transformer is 78mm wide, 64mm deep and 64mm tall. Fixing centres for the U-clamp mounting feet are 96mm apart. It comes with an insulating sleeve (photo, right) that you slip over the primary's solder lugs and prevent accidental touches of the high voltage supply.
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A great-sounding output transformer for classic 18W-based amplifiers
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