On Thu, 18 Mar 1999 15:48:44 -0000 Peter Chadwick
<Peter_Chadwick@mitel.com> writes:
>
> >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
>
An arc in a vacuum would not go BANG.
Neither would the opening of a 2W resistor.
Sounds like a HV breakdown to me that is external to the tube.
Off to work; be back in 11 hours....
73 Carl KM1H
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