I have been told that the small signal tubes do not need to be matched but that the power tubes do unless you can adjust the bias on your amp.
Chuck
Chuck
Do small preamp tubes 12ax7 need to be matched?
I had a Telefunken 12ax7 tube go out on me in the V4 (R) position of my Aesthetix Rhea, so I replaced the pair with stock Sovtek 12ax7WBs. Do I need to replace the Teles with a matched pair, or can I just pick up a single and throw it in. Obviously, I'll stick with smooth plate, as that is what was in there.