[Elecraft] K3S speaker vibration/whine

[Ron D'Eau Claire]

Are all the top screws in place, including the chassis stiffener bar that is mounted on the KPA3 shield and attaches to the top with three screws?

When assembled, there are no "vertical metal pieces that contact the top" that are not secured by screws. 

73, Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of ae4pb at carolinaheli.com
Sent: Thursday, October 22, 2015 8:56 AM
To: 'Randy Moore'; ae4pb at carolinaheli.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3S speaker vibration/whine

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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