[Elecraft] New KPA500 problem.

[Andy Durbin]

"How about disconnecting all cables except power, antenna, and keying line and testing if the amp operates properly with RF detection?"

Why not start by eliminating everything except the KPA500?

Disconnect everything except KPA500 power and press each KPA500 band button.  Observe KPA500 either displays the appropriate band frequency or it does not.  If test works then add external band control (RF, AUX, or KPA Utility).

Andy, k3wyc