[Elecraft] [KPA500] incredible hum from PA

[kevino z]

Nope. I have one at work and it is quiet. Something is different with this one. As I stated in my original post, I'm confident that Elecraft will make this right. They are great folks over there.
-Kevin (KK4YEL)

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The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.

On Dec 20, 2016, at 12:12, Ron D'Eau Claire <ron at cobi.biz<mailto:ron at 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-bounces at mailman.qth.net] On Behalf Of
Charlie T, K3ICH
Sent: Tuesday, December 20, 2016 4:40 AM
To: elecraft at mailman.qth.net<mailto:elecraft at 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



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