04-11-2014, 11:35 AM
You never know. Sometimes it can be something simple and quite unexpected. The other day I was listening to my prized Sherwood and a channel went dead. All of the horrible possibilities, like having to find a new OPT went through my head. When I had it apart, I could not believe that the filament on a 6EU7 had opened up. Other than old battery radios, how often does that happen?! Well it gave me a chance to reset the bias. All happy now.