Rich says;
>I have never been able to find an arc mark in a tube that grid-fil.
>shorted during a big-bang event.
According to Gossling's paper, 'tree like markings' appear, but they can be
quite small. He goes on:'If the discharge current passes through two limbs
of a filament placed side by side, these are often pulled together by the
magnetic attraction of the parallel currents, causing a short circuit and
spoiling the valve', which sounds very much like the filament heix bending
you've observed, Rich.
Question: when these 'big bangs' occur in amps with paralleled tubes (such
as 3-500Zs), do both tubes go west, or only one?
73
Peter G3RZP
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