I was getting this HI CUR message to and it was driving me CRAZY! I called Elecraft and I was going to send my K3 back to them and then I saw a few YouTube videos and I installed a TON of toroids on the K3 and Amp and every wire in my shack and no more HI CUR message. Best of luck! -- Sent from: http://elecraft.365791.n2.nabble.com/