I recall a good bias current for a 6L6GC is about 35 milliamps. This sets the amount of current (in watts) the plate/cathode can safely sustain. Excess current on the plates will cause "red plating" and will shorten tube life.
Tubes and GAIN on Cary Rom-808
The NOS Black plate 12BZ7 tubes and the 12AX7 tubes are possibilities for GAIN portion of my Rocket 88.
I have little understanding of these. I have them both. I check the bias when I roll them.
Does anyone have knowledge enough to expound on the subtle differences/changes that can be listened for when choosing either one… if there is any?
thanks,Moose