On Jun 26, 2006, at 2:40 PM, Keith Dutson wrote:
> IMO, comparing current flow through semi-conductors and tubes is
> not wise.
> Solid state devices can avalanche while metal in a vacuum has no such
> characteristic that I am aware of. I think this is why
> manufacturers of the
> former are reluctant to be lenient on warranty claims.
In this case, warranty claims are not the issue since a thoriated
tungsten filament/cathode's emissive layer can not be dislodged by
even double the required driving P.
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