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Original Message
and further...LOL
Posted by PakProtector on April 21, 2017 at 03:49:48:
The so-called g3 in this sort of tube is actually a beam concentrating set of plates. Beam tetrode is the correct term, as the electron concentration has the same sort of effect as hanging a third grid at ground potential, known as the suppressor grid in between the screen grid( g2 ) and the anode.
cheers,
Douglas