Sorry for kidnapping...
interesting story about Harold Leak. I have 2 Stereo 20, and at the 16 ohms taps with some good tubes and original carbon resistors of the right value they sound really very good e.g. with horn loaded speakers. They have an unusual high input sensitivity but they make a good match with an older and simple made, but very good sounding Croft preamp which does not boost the signal so much.
