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Re: [Amps] Neutralizing Dentrons

To: "Amps Amps" <>
Subject: Re: [Amps] Neutralizing Dentrons
From: "Tom W8JI" <>
Date: Sun, 25 Jun 2006 17:55:59 -0400
List-post: <>
> 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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