Jon says:
>Is the amplitude of a spark that is generated by hotswitching a 100W
>signal on the input relay really large enough to drive the tube and
>thereby generate a change in anode current on the output?
Isn't this one of the 'does the sound exist in the forest if no one is there
to hear it?' type arguments? If there's an arc at the input applied to the
amplifier, it is coincidental in arriving at the input with the input RF
which will drive the amplifier and change its plate current anyway.
Personally, I disagree in general with Rich about parasitics and killing
tubes, although I concede that a parasitic could boil gold on a tube with
low grid dissipation. It's just funny that commercial manufacturers of
amplifiers (commercial meaning for commercial market, as opposed to the
amateur market) just don't seem to get a problem. I also question whether
overheating of parasitic suppressors isn't down to them getting very hot
because of physically where they are, and to them being under rated for the
amount of dissipation of the fundamental they get, especially on 10, 12 and
15 metres.
73
Peter G3RZP
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