[AMPS] Blown TL922A... What to do?

[Peter Chadwick]

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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