[Elecraft] K3 - speaker buzz

[Steef PA2A]

I am still using the original washers, but I have put two nuts on each of 
the four screws to prevent the nuts from falling into the rig.

Steef PA2A
K3 #1184

----- Original Message ----- 
From: "Nick-WA5BDU" <nick-wa5bdu at suddenlink.net>
To: <Elecraft at mailman.qth.net>
Sent: Friday, August 01, 2008 8:26 PM
Subject: [Elecraft] K3 - speaker buzz


>A month or so ago there was a flurry of posts about buzz in the speaker. 
>On poster replaced fiber washers used to mount the speakers with neoprene 
>and reported good results.
>
> With my sidetone level set at about 45, I heard pronounced buzzing at 350 
> and 400 Hz sidetones.  (Adjust your sidetone level with MON, then go to 
> PITCH and adjust the sidetone pitch throughout its range.)
>
> Since I had to pop the top to install my back ordered 6kHz filter, I took 
> the opportunity to replace the fiber washers with improvised ones made 
> from small grommets sliced in half.  I did get some improvement.  Now the 
> major buzz is limited to 350 Hz.  In putting some slight finger pressure 
> at various places on the top cover, I see that the speaker isn't at fault 
> but that the top plate has some resonances.  I'm thinking of putting some 
> kind of resonance killers on the underside, maybe some globs or beads of 
> RTV or similar, so as to avoid any kind of permanent change to the rig.
>
> Anyone else done anything similar?
>
> 73--Nick, WA5BDU
> #1195
>
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