Do it the right way,,When in doubt,buy another set and have them on hand..If anything changes ( in sound ) dump the old set for the new...Always try to stay one step ahead of trouble.......
Tube Life
I’m using a phono pre-amp with a pair of telefunken 12AX7 and one 12AT7. I purchased these tubes several years ago and they were rated at about 50% life. Are tube noise and tube rush the only reasons to change out tubes? Everything is silent and yet I can’t help but think that several years of use should indicate some sort of wear. Any experience or suggestions will be appreciated.