Fred says;
>How did you discern that it was not one of Eimac's fabled "barnacle"
>incidents?
The phenomena known sometimes as 'barnacles' is also called 'flash arc'. It
was described in a paper by B. S. Gossling of the General Electric Company
Research Laboratory at Wembley, England in the Journal of the IEE in 1932.
I can provide copies of it if anyone wants it (24 pages). It has exactly the
same symptons as ascribed by Rich to parasitics. I quote the summary:
'The "flash arc" phenomenon, sometimes called the "Rocky Point effect," is
the spontaneous and complete breakdown of the high insulation normally
afforded by a good vacuum between metallic electrodes. The breakdown does
not, in general, follow immediately upon the application of the voltage, but
is preceded by an interval or "time lag" of widely variable duration.'
That seems to me to be a pretty accurate description of the phenomena
referred to.
73
Peter G3RZP
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