Hello.
Yesterday I finished building my Crack. One of the first times I powered it up for testing the 6080 tube glowed very bright (like a light bulb) in a single spot of the filament. After some power on and off, I connected the input RCAs and the tube returned to glow normally and the amp worked as it should.
Today I installed the Speedball upgrade and when I turned it on for the first time I had the same problem until I connected the input RCAs and tried to turn it on again.
The problem is that even the tube glows normally the right channel is dead. I checked all the connections and they are ok, but not the voltages, terminals 1, 7, A6, B1 and B3 all measures about 170V instead of 90~100V. The two LEDs on one of the small Speedball boards don't emit light (already checked polarity).
Before starting to desolder: have you any idea of what could be the problem?