On Thu, 26 Oct 2000 16:08:36 -0400 "Tom Rauch" <firstname.lastname@example.org>
>It has no negative feedback. It simply runs a tetrode as a grid
>driven class AB2 triode amplifier, with a tiny amount of time-varying
>screen voltage. The 300 ohm swamping resistor is almost nothing
>in this circuit compared to the peak loading of the exciter when the
>grid swings positive.
The 4-125 exhibits about 2.5K of grid impedance at 100V peak
(positive) drive. The pair will be about 1.25K. This is a reasonable
fraction of the input loading compared to the 300 ohm swamping R.
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