This is EXACTLY the answer I needed. The amp uses a pair of 4-125As
and the screens are at "350V - 400V" Plates at "2000V - 3000V" (but no
terminating resistor) so I guess that makes it a class AB1 linear. The
screen grids have several bypass caps to ground but no resistor. The
signal is fed to the control grids through the MB-40-L and the plate
circuit is prety normal..
Just what I needed for my vintage shack linear.
R. Measures wrote:
Jim -- If the tetrodes are being operated at roughly half of their max
screen-V rating, they are likely being run in a non-linear mode. If
they are being operated at their max. screen-V rating, and there is a
grid-terminating R, they are probably operating in Class AB1 linear
service.
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