How to tell if the tube needs replacement?


Hi
I don't have any experience with tubes but my CAL Alpha has 2 12ax7's in it's output stage.What to look for in the sound when the tube is going?As you know some days even the best systems sound bad.Thank you.
overhang

Showing 1 response by weiserb

If you hear Strain or distortion . I do try to retube stuff every few years especially power tubes.