[Amps] Trouble with LK500-ZB

[Vic Rosenthal]

CGranski at aol.com wrote:
> Have an Amp Supply LK500-ZB that has developed a problem on 160
> meters. This amp uses a pair of 3-500's in grounded grid. Power
> output on a Bird has dropped to ~400 watts max and it draws excessive
> plate current with more than 50 watts of drive power. Performance on
> all other bands is normal and the problem is present with a dummy
> load or antenna. The ceramic caps switched in on 160 have all just
> been replaced with no improvement. Input SWR is normal.

If you've replaced the capacitors you probably looked carefully at all 
the bandswitch contacts...right?  Is there a plate current dip when you 
try to tune it?


-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco