[Elecraft] KPA500 code oscillator

[joeduerbusch]

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

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On Sun, Oct 23, 2016 at 5:46 PM, W1GO (Joe) <w1go at 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
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