[Amps] THANKS re: Negative current with a zener screen grid regulator

[N1BUG]

Thank you to all who replied on and off list. Although there were 
opinions on both sides the overwhelming majority consensus is that 
my screen regulator is fine. Eimac seems to agree from what the tube 
data sheet says.

I am just going over things trying to sort out why the amp keeps 
self destructing. Hopefully a hi pot tester I am building may give 
some answers or at least clues. For now, I believe my screen 
regulator is a victim, not the cause (as in screen voltage running 
away and creating mayhem).

Paul N1BUG