WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
Got an old SA220 that's working fine. IMHO simply replacing the stock crap tubes with NOS makes this amp quite listenable. I've also done some fairly simple mods that ramped it up
even futher. Anyone interested in swapping mod ideas?