[AMRadio] Viking II no output


Geoff/W5OMR ars.w5omr at gmail.com
Fri Feb 9 13:37:49 EST 2007


kenw2dtc wrote:
> "The output section in an E. F. Johnson Viking II is only producing 
> about 10w output,, or so".
>
> I had a similar problem with a Valiant.  Turned out to be a shorted 
> mica cap on the output of the pi-network.  In my case I started 
> opening up the course control and when it got to position 6 there was 
> suddenly got full power.  It turned out to be one of the large caps 
> for the lower frequencies.  This may not be your solution, but it's 
> worth a quick look.

as stated in the previous message, no moving of the course coupling make 
an appreciable difference on the amount of plate current drawn from the 
final.

The tubes have been checked against a good working set of 6146's.




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