[Elecraft] KPA500 Issue

[Andy Durbin]

"However, what I’m seeing is that when the amp is in OPER mode, my receive signal strength drops way, way off to the point I have to go full AF volume to hear signals. If I put the amp in STBY, signal levels go back to normal."

These exact symptoms have been associated in past reports with a failure of the TR switch PIN diodes.  Jack's idea of incorrect band can be easily confirmed, or eliminated, by looking at the KPA500 band display.

Andy, k3wyc