[Collins] KWM-2A output

[Jim Brannigan]

I suspect your finals are a bit soft.

Jim

> In the process of repairing the plate cap for the 30L-1, I checked the
> output of my KWM-2A.  I was disappointed to find I only had 75 watts
> into a dummy load.  With 225 ma and 820V (184 watts) on the plate that
> only gives me 40% efficiency.  If I load to 275 ma and 800 volts (220
> watts), I get 100 watts out and 45%.  The spec in my manual is 160 watts
> input CW and 100 watts out.  That's on 80, 40 and 20M.  I was testing on
> 80 and 40M.
>
> I checked the idle current and that is OK.  I guess the plate meter
> could be wrong but I doubt it.  Tune up is supposed to be at 230 ma.
> Before I chase a ghost, is anyone else getting better than 50% efficiency?
>
> 73,
>
> Bill, K3PGB