I'm building a AN762-140 from Communication Concepts, INC. They don't answer email or return phone calls so if you are wanted help from them forget it. If I knew how bad their support was before I had started, I would have gone somewhere else. I have the amp built and did the voltage tests before putting in the RF transformers per the directions. Everything was perfect. Put in the transformers, was trying the set the idle amps when I couldn't get a reading and the heat sink was just heating up. Self Oscillation? When I called, no return call. Email? same. Anyone here have any ideas. Called out ARRL labs because they recommended them and they said try here. Please help.