On Jul 21, 2006, at 4:21 AM, Tom W8JI wrote:
>>> An 8877 cathode can emit 50A. If 50A is flowing into the
>>> grid, how
>>> does your electronic circuitry stop it?...
>
> That sounds factual on the surface but the 50 amps actually
> comes from anode current at 10kV anode voltage in pulsed
> applications with a 3CPX1500A7 pulse rated tube with hotter
> cathode and driven with a kilowatt, not 8877 grid current.
The tech spec sheets tell us the 8877 cathode can emit >50A. If the
anode happens to be no more positive than the grid would many
electrons go to the anode?
>
> Very few amplifiers would be running the cathode at 3CPX1500
> temperatures and even fewer would have 10kV dc between the
> cathode and other elements.
The problem is what happens when the anode potential of an 8877 drops
to under 100v.
>
> 73 Tom
>
>
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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