[AMPS] Calculating input impedance and drive requirements?

[Randall DuCharme]

Greetings gurus,

I'm a little bit lost....

I'm unsure as to the correct mathematics and methods
to calculate the input impedance and drive
requirements of an amplifier stage.  Seems that I need
this info in order to design the inputs.

The project at hand is a 4x813 HF amp, cathode-driven,
with bypassed screen and bias supplies.  


Hoping this isn't a ridiculously stupid question :-)

Many thanks in advance for any assistance!

Kind Regards

(KD5IZI/AE)

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