Tom
> If the cathode
>isn't stripped by the attempt to draw beyond safe emission limits
>(a thoriated tungsten filament emitter does NOT have this problem,
>it will simply saturate at lower currents as temperature falls) the
>anode and screen will be ruined from heat produced by the many
>electrons smashing into them.
Something at the back of my mind says that I've seen somewhere that one
shouldn't run a thoriated filament in saturation, but I can't remember
why - the penalty of getting old, I guess. If you run it too hot, then
you boil out the thoria, but doesn't something nasty happen if you run
it too cold, besides not getting enough emission?
73
G3RZP
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