[Elecraft] KPA500 Clicks

[Eric Swartz - WA6HHQ, Elecraft]

As noted in the current KPA500 manual, this is normal and can happen after the 
heatsink has been heated up. As it cools the different metals in KPA500 case and 
heatsink contract at a different rate, causing the slight ticking that is 
occasionally heard.

73,

Eric
elecraft.com

On 4/2/2014 3:15 PM, Jessie Oberreuter wrote:
>
>      This came up recently w/ the K3 as well, and perhaps a year or two back.  
> It /sounds/ like a tiny relay is clicking in the K3 on t/r switching even 
> though it's all solid-state.  Wayne speculated that the sound might be coming 
> from relay springs re-balancing slightly in response to associated voltage 
> changes on the power rails.  I don't believe it's been tested further. Perhaps 
> you're hearing something similar from the KPA500.  -kb7psg
>
>
> On Mon, 27 Jan 2014, zendoc at netspace.net.au wrote:
>
>> FWIW, I've noticed these clicks from within my KPA500 too.  I always
>> assumed they were thermal expansion and contraction of hardware within
>> the amp.  I ignore them because they have
>> never been associated with any problem with the function of the amp.
>> Besides,  I don't know how you'd begin to try to isolate exactly
>> which bit of metal in there is doing the clicking to be able to do
>> anything about it.
>>
>> 73,
>> John
>> VK7JB
>>
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