How do you know when preamp tubes go bad?


Over the last few days the sound quality of my system has diminished considerably. I'm using a tube preamp driving a SS amp.I've seemed to lost a lot of my my soundstaging.Any input would be greatly appreciated.
mfb33

Showing 1 response by imin2u

I'm no expert, but I thought they started to "ring" at the start of their demise. The ringing would go away by tapping the chassis top but randomly return weeks later. I'm currently running an Audible Illusions 3A with white Amperex 6922 (NOS).