Mine is silent during normal use, but when someone in the house prints something using the laser printer that is on the same circuit, the transformer gives off a brief groan.
I don't think this means my transformer is defective, would anyone disagree? 73, Matt NQ6N On Tue, Dec 20, 2016 at 11:10 AM Ron D'Eau Claire <r...@cobi.biz> wrote: > I believe most of the noise comes from the steel bottom of the kpa500. > > > > 73, Ron AC7AC > > > > -----Original Message----- > > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of > > Charlie T, K3ICH > > Sent: Tuesday, December 20, 2016 4:40 AM > > To: elecraft@mailman.qth.net > > Subject: Re: [Elecraft] [KPA500] incredible hum from PA > > > > > > "No trees were killed in the sending of this message. However, a large > > number of electrons were terribly inconvenienced !" > > > > Yeah, but you have to realize, electrons LIKE to run around madly. They > > LIVE for the opportunity to be driven by that strange (to them) > > electromotive force, regardless of whether it's in one direction (DC) or > > back and forth (AC), just as horses luv to run. > > They live basically a very nomadic life, jumping from one nucleus to > > another. They get sluggish if not driven regularly. This is why old stock > > vacuum tubes can fail while just sitting on the shelf. > > Electrons also appreciate the applause as horses do when they perform, but > > seldom get to enjoy it. So, when you make them run, at least provide a > > little noise so that know they're well liked. Hmmm, maybe THAT"s why the > > transformer hums? > > > > More to the point of the subject, I wonder if it would have been possible > to > > use a brass bolt or maybe even nylon mounting hardware for the big toroid? > > Probably not worth the effort is a simple re-tightening can fix it. > > ( You'll just have to provide some outside method of showing your > > appreciation to the electrons for their efforts.) > > > > 73 Charlie k3ICH > > > > > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > Message > > delivered to r...@elecraft.com > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to m...@nq6n.com > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
