"Clyde Slick" said:

Improper bias setting caused planes to fly directly into the ground.
Russian EL34's implicated.

"sound's good"

I've had a customer recently with a Marshall geetah amp.
I put Sovtek EL34s skinnies in there some 3 years ago.
This guy has approx. 2 gigs a week and Marshalls run their tubes HOT!

The tubes still tested over 80 % on my AVO tester (and yes, it's
calibrated !) .

So don't anyone start about bad quality Russkies :-)

--
Sander deWaal
"SOA of a KT88? Sufficient."