>
>Hi All,
>
>I am try to build linear amp using single 4-400A, I don't know, how much
>drive required for 4-400A in class AB1..Any body could describe me, how much
>is it ??.
>
? With 4kV on the anode and 800v on the screen, it takes about neg. 140v
on the grid to make 75mA of ZSAC. . With a 200-ohm grid termination R
and a 1 to 2 bifilar input transformer, 140 p-v works out to about 50w of
drive. For best stability, ground the screen direct to the chassis and
DC-float the cathode. There's a circuit on my Web site.
- cheers, Firson
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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