If the driver tubes were the problem would they sound great one day and then the next just be barely audible?
I am using the stock Westinghouse tubes plus the Sophia. But I don't have any spares for the driver tubes.
I guess I'll have to order some and try them out.
Has anyone else had such a dramatic difference occur like this? I am new to tubes and I suppose I was under the impression that they would sort of slowly lose their sound quality over time...as opposed to this night and day thing?