Tom says:
>The anode systems are usually resonant far below the grid's
The corollary to Tom's statement is that a tube with the anode parasitic circuit
resonant at a frequency below that of the grid parasitic circuit will not
oscillate. See Terman's 'Radio Engineering'.
In this case parasitic suppressors aren't needed - for a QRO example, see the
Marconi H1500 of 1964, with its 3CX35000 in g-g. That had the grid in a collett
connected to ground, and no parasitic suppression necessary.
73
Peter G3RZP
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