Well finished the 100 watt PA tonight and did not spend as much time checking components as I should have :(
All resistance checks where good and everything checked out (fan, swr cal, ect) until I got to the point where I powered the K2 radio from the high current supply. I detected a "crackle" on power and shut it down to check. All looked OK so I tried it again. Seemed OK and everything looked good with current draw but the bias would not adjust at all. Just stayed around 600. So I started doing resistance checks and across the power plug it was several hundred ohms and not > 10K it should have been. This checked OK originally without power. So I start lifting components to narrow it down and I get back to U7 and if I had looked in the first place, I would have noticed I put it in backwards <sigh> So upon removal the resistance across the power plug is back to normal. I am sure U7 it toast since the resistance was OK before power and not after. Can someone tell me if there is anything else I should order when I do? Maybe Q5? That is what you get when you dont follow directions ! 73, Rich kdozv _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com