Hi, Andre - I wonder if it's a problem with blown D16 and D17 in the KPA100. If you follow this forum on-line at nabble.com, you can do a search for "D16" and see many postings on the topic. Good luck. - Bruce K1FFX ----- Bruce Rosen K1FFX K2/100 6982 KSB2 KAT100-1 KAF2 KIO2 -- Sent from: http://elecraft.365791.n2.nabble.com/