I am frequently asked what are the best 6L6,6V6,12AX7 etc. The following
tubes seem to be the most consistent with the understanding that you just
can't plug and play power tubes, unless the amp is cathode biased. Even
then the amp should be gone over to make certain the tubes will run within
their prescribed parameters.
Biasing has been pretty much beat to death but I will add my 2 cents worth.
Crossover distortion and a good tech will work in about 70% of the cases.
If the amp has been modified or even if it's stock it is always a good
idea to check the plate current on each tube to make sure you are within
the plate dissipation wattage of that tube. One half the plate dissipation
at idle is a safe setting. Installing cathode resistors to measure the
total current seems much simpler than the shunt method, safer too.
NOS tubes. If you cannot get good quality current production tubes then
use NOS. Buy from a good supplier!
These tubes work for me. If you have a different opinion,thats fine too.
6L6--the winged C or SED 6L6GC is a very well built tube and sound great
in just about any amp I have installed them in.