[Elecraft] KPA500 Clicking Noise

[Andy Durbin]

"but after it warms up - 40 degrees C or so - I start to hear a faint clicking noise."

You should stop using it.  There is clearly something seriously wrong.  All KPA500 should make a loud, not faint, clicking noise as they heat and cool.

(I suppose I shall have to explain that much has been written about KPA500 clicks and the attempts to fix this irritation. Try a search of the archives as discussion of this topic is likely to be cut off short.)

73,
Andy, k3wyc