replace when it won't hold bias or you hear a rushing sound or it becomes microphonic or the definition softens...tubes can blow and that's never a good thing for an amp....all that said, I wouldn't listen to anything but tubes....music tones sound real.
Tube failure -- what would happen in worst case?
How do you determine when a tube is to be replaced?
Can a tube ever glow bright red and blow up?
If it does, would it damage the amp itself as well as other components including the speakers?
Can a tube ever glow bright red and blow up?
If it does, would it damage the amp itself as well as other components including the speakers?