Re: [Amps] Passive grid stability calculation for a tetrode?

[peter chadwick <g8on@fsmail.net>]

Actually Bill, the formula was derived using tuned circuits, where Rp = QXLp 
and Rg = QXLg. As you move off resonance, the impedance and gain naturally 
drops. However, it is worth keeping the value of H around 1 to 1.25 maximum.

The input impedance should be figured as the swamp resistor in shunt with 
121pF, although as that is a lower impedance, it will actually increase 
stability. Whether or not the driver can stand the SWR (and be stable!) is 
another matter.....

73

Peter G3RZP
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