[Amps] Amplifier scenario question

[mikea]

On Thu, Sep 17, 2009 at 06:41:57AM -0400, Gudguyham at aol.com wrote:
> As a prelude to my next post, I would like to ask this question for the  
> benefit of some of the newer members here.  What could happen if I am  driving 
> an amplifier with a full 100 watts and suddenly (unaware to me) I lose  HV 
> on the anode of the tube and I continue to  transmit?

If it's a triode, or if it's a tetrode with screen voltage derived from
the plate supply, you're OK. If it's a tetrode and the screen voltage
stays on even after plate HV drops, the screen starts acting like the
plate, which is A (Very) Bad Thing Indeed.

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin