[Johnson] Grid current

[John Lawson]

On Wed, 21 Dec 2005, Chuck Hurley wrote:

> Strange thing happened to my Viking Valiant.  It was operating 
> beautifully on all bands.  Now it will not load on 160 or 80 meters. 
> By that I mean that I cannot get any real grid current on those bands. 
> Works fine on 40,20,15,10.

   Does not load with - low plate current - or - uncontrollable plate 
current?

    If the first, no drive on 160/80 I might look to the VFO first, then 
the multiplier tank circuits, since it seems the multiplier is working on 
the other bands.

    If the second - perhaps the capacitor stack in the final tank for those 
two bands have gone to that Great Scrapyard in the Sky....

>
> VFO switch is being mechanically activated OK by the band switch.  No broken wires to the large coil.
>


   If this is so - does the rig work on (gasp...!) 11 meters?  the 
'escapement' is of course common to that band as well.


   Just some thoughts - you do have the manual/schematics I assume? If not 
they're readily available on BAMA and elsewhere.


   Cheers

John  KB6SCO