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[Misic, George J.]

Hi all,

The real problem with the "min Ip, maximum output" neutralization method has
to do with the grid drive to the finals.  This method works fairly well with
Class C finals that are driven fairly hard [so that variations in the drive
level do not materially effect the tube plate current or output power, as
the drive signal switches the tube betwixt cutoff and saturation]; however,
with tubes in Class AB [not driven into saturation], the feedback effects of
the RF signal change the drive level in a somewhat unpredictable way, thus
changing how much drive signal is effectively applied to the tubes.
Removing the plate and screen voltage allows the bridge circuit to be
balanced more effectively.  73.

George KE8RN

> -----Original Message-----
> From: Steve and Anne Ray [SMTP:sbralr at WORLDNET.ATT.NET]
>
> I have used 6146Bs in my HW-101 with very good success, the secret to
> neutralizing is to do it by the method in the service bulletin, where the
> plate and screen voltage are disconnected.   The results showed me that I
> got a lot better results and
> I really did not have the optimum neutralization by just doing it max
> poweroutput and min plate current method.
>
>

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