Stock Crack Loud Buzz/Hum Left Channel

[Troycnc]

Hey Guys,
Just giving a update with my battle with this amp. I ordered a new 12AU7 tube to rule it out as the problem.
Just installed and it is dead quiet. This amp is awsome!!!
I really appreciate your help Paul with everything. I will post new voltage and resistance measurements this evening to make sure all is well.
Troy

 

[Paul Birkeland]

I would hang onto the old tube too.  Sometimes tubes are noisy, and sometimes the act of tube swapping knocks a loose connection back into operation for a while.