Strangely, I can’t seem to get stable performance out of a single speaker connected to this amp.
my 2×8″ cabinet works fine. my 1×12″ cabinet makes it squeal. either 8″ speaker alone seems to make it squeal.
if I have the 1×12 in on one speaker out jack, it squeals, but stops as soon as i plug the 2×8 into the other (both are 8 ohm cabs). but the 2×8″ cab goes almost completely silent and i only hear the 1×12 – which doesn’t squeal.
eventually this amp is going in a 1×8 combo so i need to solve this problem…
i’ll try some other 12ax7s tomorrow and see what happens.