Hl Joe, I also have a KPA500. It also had the Buzz and noise. I sent it in to Elecraft for a different reason, and they found a Bad "Z-Bracket" and replaced it. Now is the KPA500 is silent except for the loud fan. Mine was factory built, so I don't know what this bracket is, but think you should take a look at it.
Joe K0BX #1 Honor Roll Mixed Honor Roll Phone Honor Roll CW Honor Roll RTTY Honor Roll 20 Meters 5BDXCC Plus 30,17,12 5BWAS Stop the insanity! Please do not add me to any distribution lists (Joke, Stories or Junk) without my permission. On Sun, Oct 23, 2016 at 5:46 PM, W1GO (Joe) <w...@icloud.com> wrote: > > Hi all, > > Finished assembly of KPA500 and a little surprised at the magnitude of hum > / buzz during CW (no real issue on SSB); I've read about it but was > surprised at just how pronounced it is. I could use the KPA500 as a code > oscillator for practice; no need to keep monitor turned on. I've read most > of the historical dialogue regarding methods to minimize "the buzz": use > yellow wire tap, keep wires from touching chassis, make sure everything > (including transformer) is good and tight, etc. all those things are done > with little positive impact. I'm running off well regulated 240 VAC. > > I just wonder if anyone has any other "secrets" they might share. My code > proficiency is not great, at this point, and having the KPA500 groan in > response to my keying is somewhat distracting; even with headphones when > monitor is turned up higher than usual. > > Best regards, > > Joe > W1GO > ______________________________________________________________ > 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 k...@arrl.net > ______________________________________________________________ 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
