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.'
An interesting paper, with references back to late 1800s, when arcs of this
sort in vacuum were described. Whether or not it would scan, I don't know - I
only have a photocopy of a photocopy.
73
Peter G3RZP
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