I have the 23rd edition of the Radio Handbook by William Orr W6SAI.In
section 17-9,High Power Amplifier Design it shows a circuit diagram for
a pair of 3-500Z triodes in Grounded Grid.The circuit is basic without
frills but clearly shows the Grids to be directly Grounded.
I have an article from Ham Radio magazine July 1979,linear Amplifier
design By William Orr W6SAI pages 34 to 39.This article has a circuit
for a pair of 3-500Z triodes once more in Grounded Grid.
Take note that in both articles the Grids are directly Grounded.As far
as I am concerned the end of the argument..
Regards...Bob VK3ZL..
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