[AMPS] Question: input Z on class AB gnd grid pair 4-400 ??

[charlie.ocker@tellabs.com (Charlie Ocker)]

Greetings,

After digesting the material that I have collected and the responses
from an earlier post (tnx, Skipp), I think the best way to go for my
homebrew amp is to run the 4-400's in class AB grounded grid.

I have dug up a couple of construction articles.  One is from the 1982
ARRL Handbook.  In chapter 6, it describes "An Economy 2-kW Amplifier"
that uses these tubes grounded grid.  It doesn't, however, have a tuned
input network.

I'd like to add one.  But before I do, I need to know what the approx.
input impedance is for a pair of 4-400's in grounded grid.  If it
matters any, I plan to run 3000 ~ 3500v on the plates.

Thanks in advance!

73,
Charlie  N9CO

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