[Amps] Grid fuses (was: Life and gain of 3-500Z)
Tom W8JI
w8ji at w8ji.com
Fri Jul 21 07:21:30 EDT 2006
>>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.
Very few amplifiers would be running the cathode at 3CPX1500
temperatures and even fewer would have 10kV dc between the
cathode and other elements.
73 Tom
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