[Johnson] Grid current

[Jim Brannigan]

Johnson used a VFO-multiplier design.
A 160M fundamental is used for 160 and 80M, and a 40M fundamental is used 
for the rest of the bands.

Mechanically, the VFO circuit is switched by a "escapement" type mechanism 
driven by the Band Switch.
If 80 and 160M are not working, then it could be the VFO switch is out of 
sync or a component has failed in the 160/80M VFO circuit.

Jim


> Sounds like no oscillation on those two bands....
>
> I'm new to the Johnson designs.  Does the VFO oscillate on the fundamental 
> frequency or is it mixed with another local oscillator?   One of the two 
> don't want to oscillate on those two bands...
>
> Cecil....

> 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.
>
> VFO switch is being mechanically activated OK by the band switch.  No 
> broken wires to the large coil.
>
> Need some help fast
>
> Chuck  K1TLI