[Elecraft] [K3] Speaker buzz

[The Smiths]

Didn't you get the little foam doughnut that sticks to the back side of the speaker?  This is there to do exactly what you are describing.  If not, you should order one from Elecraft.
 
> Date: Sat, 14 Aug 2010 10:44:54 -0500
> From: wrmoore47 at gmail.com
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] [K3] Speaker buzz
> 
> Just completed my third K3/100 build (this one is actually mine!), and 
> like the other 2, this one had a speaker buzz (not heard through 
> headphones) at audio frequencies around 300 hz on CW, but this one 
> seemed worse. I fixed it by:
> 
> 1. Lining the lip and inside of the speaker shield with one layer of 3M 
> electrical tape. This removed ~80% of the buzz.
> 2. Putting a 1" long piece of same tape over the middle of the top edge 
> of both sides of the KPA3 module shield. This put tape between the top 
> edge of the shield and the top cover of the K3. This removed the 
> remainder of the buzz, and I now have clean CW tones through the speaker!
> 
> 73,
> Randy, KS4L
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