> After producing the Warrior and the GSB-201, finding that
> even though the RCA Tube Manual's "neutralization"
> circuit deceased feedback at HF, due to phase shifting as
> freq shifted, they came to realize that it had the
> opposite effect at VHF, and neither Heath nor Gonset
> produced another "neutralized" g-g amp.
Not for the reasons you gave.
1.) Heath and Gonset did not make any more four parallel
tube amps using tubes with high feedthrough capacitance.
They had no reason to put it in other amps.
2.) The path for VHF oscillation problems is not back to the
cathode anyway. The control grid floating at VHF from stray
C and the long thin inductive grid lead is the problem.
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