[Elecraft] K3S speaker vibration/whine

[ac5p at sbcglobal.net]

I use a 60 degree deflector made from 3" ABS plastic pipe that sits over the stock top mounted speaker.   This gives a noticeable boost to the sidetonefrequency I prefer, 540Hz.   I get nice room filling volume at low settings of the AF gain pot directed toward ear level.   So far this has outperformed anyexternal speaker or headphones I have used for CW.    One of these days should be able to compare to K3S, but I would bet on my deflector first.Never heard any spurious vibration/whine.   
Mike  AC5P    


     On Thursday, October 22, 2015 12:36 PM, Vic Rosenthal 4X6GP/K2VCO <k2vco.vic at gmail.com> wrote:
   

 If you do this, be sure to leave some bare metal around the screws so 
there can be good electrical contact for shielding purposes.

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/


On 22 Oct 2015 18:56, ae4pb at carolinaheli.com wrote:
> Outstanding!! I’ll try that. I don’t listen to my rig often over the
> speaker as I have some different hearing losses in each ear.
>
> <snip>
>
> Jerry,
>
> I have this buzzing in my K3, and have heard it in some (not all) of
> the K3s I have built for friends. I have found that most of it comes
> from vibration between the case top and the vertical metal pieces
> that contact the top. If that's what you're hearing, you can minimize
> it by putting some vinyl tape over the tops of the metal pieces.  In
> each case I've seen,  the buzzing is worst around 400 Hz, near my
> favored CW sidetone frequency!
>
> 73,
>
> Randy, KS4L
>
> </snip>
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