I just finished my build and I'm having a few issues.
Upon initial power up, both tubes glowed, but audio only came through the left channel. All I could hear from the right was humming. In the process of testing voltages to try to narrow down the source of the problem, I accidently shorted my circuit somewhere.
Now, nothing but humming comes out of both channels, and I no longer get 48V in. I tested the wall wart and it outputs 48V with no load. Only one of the tubes attempts to fire up, and it just pulses. The input voltage oscillates at the same frequency from 0 to approximately 10V. Any suggestions on how to figure out what I broke? Ha