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

[Larry Molitor]

70 ohms for a pair.

73,

Larry - W7IUV


At 04:03 PM 1/12/00 -0600, Charlie Ocker wrote:
>
>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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