[Elecraft] Hum on KPA1500

[Andy Durbin]

"The mechanism whereby a coax feedline is carrying RF current into our shack producing hum is that the current couples into electronics (usually by a Pin One Problem) and changes the bias state of some gain stage."

My understanding of the original post is that hum was heard in the shack and that the origin of that hum was believed to be the KPA1500.  We still have not been told if the hum came from the PSU or the RF deck.

I can understand that RF current coupling could possibly influence the quality of the KPA1500 transmitted signal but how would that result in "hum" heard in the shack?

73,
Andy, k3wyc