I just picked up a Heathkit SP-1 Preamp and what looks like a Heathkit W4-AM mono amp but with no lettering on the chassis and one of the transformers replaced. Though the amp looks very nice with a pair of Mullard EL37 output tubes.
Does anyone have any idea of what's going on with the amp?
Thank you.
Does anyone have any idea of what's going on with the amp?
Thank you.