[Johnson] Fw: Valiant grid drive problem

[john w. king]

----- Original Message -----
From: john w. king <jbkking@bellsouth.net>
To: <Johnson@qth.net>
Sent: Wednesday, November 20, 2002 10:02 PM
Subject: Valiant grid drive problem


> Tonite I put three new 6146 W tubes in the final of my Johnson Viking
> Valiant. Didn't think final tubes were the problem, but have seen bad
final
> tubes affect entire operation. Problem is lack of grid drive to finals. I
> have observed the following symptoms:
>
> 1. I get osc current and buffer current on all bands.
>
> 2. I get a smidging of grid current on 40 meters and 15 meters but get no
> grid current on the other bands.
>
> 3. The grid current meter goes negative on all bands except 40 and 15.
>
> What is happening to my grid current??????? The drive control works on the
> osc and buffer  meter switch positioms, but doesn't seem to do anything in
> the grid positions. Do you have any trouble shooting suggestions for
> restoring the grid drive to the three 6146W tubes.
>
> Your knowledge, experience and assistance will greatly appreciated. 73,
> John, K5PGW
>