[Vintage-Audio] 12AX7 and other Tube questions

[Philip Atchley]

Phil et al

> As for the 6L6GC tubes I'd buy only Svetlana. These tubes have
> worked well in every amplifier I have used them in. I have yet to get
> a bad one. The Groove Tubes 6L6GC is likely fine too but the price
> is likely a lot higher. Whichever power tubes you get be sure they
> are biased right. High idling current kills tubes, output transformers
> and power supply components!

Interesting note on setting the bias.  This amp runs (I believe) Class AB1
with fixed bias but it is not adjustable as it is all set up with fixed
resistors.  I wonder if Peavey anticipated using "selected" tubes that had
gains within set limits?  I remember my old 100 Watt Blackface Fender Twin
had a bias adjust as did a little 50 Watt Combo (don't recall make) I had at
one time.  That little combo, running 50Watts is the one that "blew up" on
stage making everyone in church jump  more than usual!  I do know that
Peavey claims 60 Watts RMS out of two 6L6's running 500 Volts B+ which seems
to be pushing it a little harder than some folks do.

73 de Phil  KO6BB

REAL Radio is heard on Boatanchor Receivers.
REAL Music is played through  'Valve' Guitar amps!
k06bb@elite.net
Merced, Central California