Why is there "no signal" grid current?
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On Mar 1, 2011, at 12:38, "Wayne Rogers" <n1wr@chesapeake.net> wrote:
> I have a 4-1000 g-g homebrew amp. It was designed 4000 volts on the plate.
> My new supply is 5500 volts under load.
>
> With the grid at ground potential and at 4000 volts on the plate the no
> signal grid current is 40 mA. and the plate current is 170 mA, which seems
> right.
>
> At 5500 volts on the plate and the grid at ground potential Ig is 80 mA. and
> Ip is 300 mA. which seems a bit high. My plan is to add bias to the grid.
> How do I determine what the correct operating point is for grounded grid?
> At 300 mA. I'm dissipating .3 X 5500 = 1650 watts which is way over the
> tubes rating.
>
> Thanks, Wayne N1WR
>
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