[Amps] 4-400 output problem

[Steve Thompson]

Steve Bookout wrote:

> (With plate current dipped) As I increase drive, the grid current goes 
> up.  I tweak the C2 cap, grid current goes down; RF output goes up.  Maybe 
> touch up the 'tune' cap a bit. All as expected.
> At some point, when drive is increased and grid current goes up, no 
> adjusting of the C2 cap will cause this to be transferred and seen in the 
> RF output.
> In the past, as probably most of have seen, this condition happens when you 
> run out of C2, at which point you would parallel a bit of extra fixed 
> capacitance, but I have plenty of C2
> I can not make the extra RF on the input, be amplified and appear on the 
> output.  Drive goes up; grid current goes up; tubes go RED; output stays 
> the same.
What does the plate current do? Do you have numbers for current vs drive 
power?

Steve