Back in January this year a friend gave me a very nice looking Henry 2KD-5 amp. He had just received his KPA-1500 and didn’t want the Henry. He also told me the amp had high voltage issues, it was fine on the CW position (2400vdc), but on SSB position (3400vdc) it had arc in the power supply somewhere. I got it home on the bench and sure enough, no problem on the low voltage tap, but on the high tap after a while you could hear it snap like breaking a wooden pencil. I decided to completely rebuild the power supply. New capacitors, equalizer resistors, new phenolic board, rectifiers checked OK, transformer megged with a Biddle megger check OK. Reassembled and on initial startup looked good, 2400vdc on CW, 3400vdc on SSB using a Fluke 87 & HV probe NO short NO “snap”. Problem solved? NO under normal load 700ma plate current and about 1250 watts out on the SSB position it shorts and pops just like before. I have tried to see the flash with all the lights off, but can’t see where it’s coming from. Sounds like in the same place as before the back of the capacitor/resistor bank. Anyone out there have any suggestions or ideas? Any help would be appreciated.