> According to Gossling's paper in the Journal of the IEE
> (which means it was certainly peer reviewed!), flash arcs
> is slightly affected by residual gas: the 'clean up'
> effect of the arc can lower the flashing voltage. He
> recommends series resistance in the anode supply (now
> where have we seen that recommended!) but says that it
> isn't generally pracitcable with valves over 10kW. He
> comments that the 'most general visible after effect is
> widespread tree like markings on the grid and filament
> supports. The fine wires in the active part of the grid
> are, however, never damaged.'
That's exactly the type of damage I have seen. As I posted
earlier, 3-500z's generally mark the grid support cone at
the bottom with very fine lines.
73 Tom
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