[Amps] Input impedance of pair 3-500z's in GG

[Charlie Ocker <N9CO@aol.com>]

Hello, group.

What is an acceptable value used in normal practice for the input impedance of
a pair of 3-500z's in grounded grid?

I've searched the archives, and haven't found an answer.

The Eimac data sheet for the 3-500z says 115 ohms for a single 3-500z with 3000
volts on the plate.

I've seen values used from 60 to 65 ohms for the pair.

73,
Charlie  N9CO

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