John, When my KPA500 hums, I assume it is a power quality problem. It only hums when a curling iron or coffee maker, both of which are on different circuits, are in operation.
--mark/ae0mm ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Friday, January 4, 2019 8:14 AM, John_N1JM <[email protected]> wrote: > Thanks Bob. Yes great amp. > 73, John N1JM > > Bob McGraw - K4TAX wrote > > > Yes it is normal to hear a slight hum when the Mains switch is on. Also > > the left side may be slightly warm. When the Mains switch is on, the > > low voltage power supply is on. This supply is for the logic and > > processing. > > See the IMPORTANT section on page 14 of the manual for further details. > > Wonderful amp. Love mine. > > 73 > > Bob, K4TAX > > > > 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 > > Message delivered to > > > [email protected] > > -- > > Sent from: http://elecraft.365791.n2.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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
