[Amps] Grid fuses (was: Life and gain of 3-500Z)

[Tom W8JI]

>>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