I too have noticed a hum emanating from the KPA500 (#26), but the circumstances are a bit strange. The hum comes sometimes when the KPA500 is off. By that I mean it is powered down (front panel power switch is off..no leds are lit), but not removed from the AC outlet. If I flip the rocker switch on the back of the rig, the hum disappears, which would make sense because no AC would be coming into the box, right?
But if I leave the back rocker switch on and use only the push button switch on the front panel to turn the amp on and off, occasionally I hear a hum when it is 'off'. And I do mean only occasionally. I have noticed it only a few times and I have been using the amp almost daily for the last month and a half. When it has occurred, it has been eliminated by switching off the rocker switch in the back. It is not really a problem for me, but I thought it might be additional information for Wayne et al. ..mike AI6II -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-500-Hum-tp6640065p6643696.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
