Re-wired all the input jacks with new switchcraft jacks and still no sound. I measured the B+ voltages with the standby off (amp should be making sound) as it runs through the circuit. The first 16uf where the main DC comes into the board measured 421V, the second 16uf to the right was 383V, and the third 16uf measured 300V. Then further to the right where it runs to the resistors (100K & 56K, 100K & 100K) in parallel to each tube it also measured 300V on both. Do you have any suggestions on what to check next. I'm running out of ideas.
I can tell the 5y3 is working, supplying power down the line, so I'm sure the power switch, fuse, standby and power transformer solders are fine. I also measured the filament pins while running and I know these are good as well (and I can see the tube glowing). I would assume it is somewhere in the pre-amp, PI, or EQ stage that something is awry, but I have ohmed out every pin through the board and it all jives. The only thing that I cannot really check is the capacitors. I know a DMM is not much help here besides showing shorts. The large 16uf caps showed around 9ohms of resistance that continue to grow, which is normal. Could I have fried my OT, is there a way to tell? I'm just not sure what to try anymore.
I do not have any extra 6v6 or 5y3 tubes, so I plan on purchasing some just to eliminate any doubts of bad tubes.
I can tell the 5y3 is working, supplying power down the line, so I'm sure the power switch, fuse, standby and power transformer solders are fine. I also measured the filament pins while running and I know these are good as well (and I can see the tube glowing). I would assume it is somewhere in the pre-amp, PI, or EQ stage that something is awry, but I have ohmed out every pin through the board and it all jives. The only thing that I cannot really check is the capacitors. I know a DMM is not much help here besides showing shorts. The large 16uf caps showed around 9ohms of resistance that continue to grow, which is normal. Could I have fried my OT, is there a way to tell? I'm just not sure what to try anymore.
I do not have any extra 6v6 or 5y3 tubes, so I plan on purchasing some just to eliminate any doubts of bad tubes.
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