Sometimes you have to be creative with replacement parts. The one thing I'd like to insert here is...
you did have a functioning amp that was "dead quiet" before folks started chiming in with what should be replaced, whether it was a ticking time bomb, etc...
while all well intentioned, as a new member, it's hard to know what experience level you have working on gear, and there's been more than one piece of vintage gear rendered inoperative by well intentioned, but inexperienced folks. Hopefully all is well.