KPA500 drive needed went up

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KPA500 drive needed went up

David Christ
This morning my K4KIO antenna iced up without my noticing it.  When I
started transmitting I got a high SWR fault on the KPA500.  I checked
the SWR with my RigExpert analyzer and indeed there was high SWR on
all frequencies.

I hooked the KPA500 to my dummy load and where I used to get a good
500 W with 20-25 W drive I now only get about 400 W with 50 W drive.

Any ideas about what is going on?  Did I lose a transistor in the final?

David K0LUM
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