[Elecraft] KPA500 Thermal Clicks

[Dauer, Edward]

    Likewise.  I have run mine (kit built) for years, mostly in contests, and never heard anything at all like that.  I have heard a rapid series of low-volume clicks, lasting a few seconds, when I shut the amp off after a session but never a click while it's running.  OTOH I do not use data modes - almost all CW and rarely SSB.  Those clicks may be "normal" in the sense that others have it as well, but I would think there's a construction flaw somewhere . . .   Can you isolate the source more precisely?

Ted, KN1CBR
    
    
    
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    Message: 21
    Date: Wed, 18 Jul 2018 21:38:24 -0500
    From: Randy Farmer <w8fn at tx.rr.com>
    To: elecraft at mailman.qth.net
    Subject: Re: [Elecraft] KPA500 thermal clicks
    Message-ID: <472786c5-cebf-abba-357e-0c8e8c36d9a9 at tx.rr.com>
    Content-Type: text/plain; charset=utf-8; format=flowed
    
    I have never heard anything like that on my early kit-assembled KPA500. 
    But... I've only used it extensively on CW. It would be interesting to 
    know if the clicks are being experienced only under high duty cycle 
    usage such as digital modes or if they have also been heard in CW/SSB duty.
    
    73...
    Randy, W8FN
    
    On 7/18/2018 6:25 PM, ANDY DURBIN wrote:
    > I placed my Android phone on top of my KPA500 and made a recording while making a few cycles of FT8 TX/RX.  The audio files can be found here:
    >
    > https://www.dropbox.com/sh/amfy3dz8pgl083n/AAAKi2GYripXyIDjiLpJ2hDwa?dl=0
    
    
    
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