I've had a peaceful coexistence with tubes for over 10 yrs now. There have been a couple of instances but a fuse was all that "went". Cause in both cases was a short in the rectifier.
I have a tube tester and that helped identify the shorts immediately. I do test tubes with it but I think the best test is to have a backup set and put them in once a year to "test" against the aging ones.
I have a tube tester and that helped identify the shorts immediately. I do test tubes with it but I think the best test is to have a backup set and put them in once a year to "test" against the aging ones.