One day I dug through my pile of salvaged transformers and came across an interesting little piece. It’s an inter-stage percussion transformer from a Hammond M3 organ, part A0-24113-0. It is listed as T5 in the AO67, M100, and other circuits. It’s about 1.5″ x 2″, not very big. Hammond used it as an inter-stage signal transformer that also coupled in a low-impedance signal on a third winding. Everyone who has ever scrapped a Hammond organ has one of these sitting around, so there are plenty of them out there for cheap or free. I fed it a little AC...