[AMPS] More on the SB220

[Peter Chadwick]

	>In all the years that I spent working on high power transmitters, I
have
	>never witnessed a failure caused by a parasitic when the
transmitter was
	>powered but unkeyed. That's why I'm having a hard time accepting
that the
>fault was caused by a parasitic. 


Could it be that you have a 'flash arc' or 'Rocky Point effect'? Although
the voltage may be considered low for a glass tube, the effects you describe
fit the description. A reference is:

The FlashArc in High Power Valves, by B. S. Gossling, Journal IEE, London,
1932 - don't have the full reference, only a copy of the proof copy.

73


Peter G3RZP



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