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Re: [Amps] 8877 Plate Voltage

To: "Mike Tubby" <mike@tubby.org>
Subject: Re: [Amps] 8877 Plate Voltage
From: "Jerry Kaidor" <jerry@tr2.com>
Reply-to: jerry@tr2.com
Date: Tue, 3 Jul 2012 15:25:07 -0700 (PDT)
List-post: <amps@contesting.com">mailto:amps@contesting.com>
> Don,
>
> Agreed, I have a single 3-500Z on 6m (very good design from QST 1971)
> but it had a bit too much gain with 3600V on the tube, so I put 3 x 22R
> 3W MOF resistor in parallel (giving about 7R at 9W) and put this in
> series with the cathode (after the tuned input) and it reduced the gain
> a couple of dB and produced a bit of NFB... works a treat.

*** I did this with a multi-tube amp running grounded grid.  One
resistor per tube.  It quieted down the current hogs and encouraged the
shy ones :).

                   - Jerry Kaidor, KF6VB




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