KPA500 Clicks

[VK7JB]

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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[Jessie Oberreuter-2]

      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, [hidden email] 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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html

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[Eric Swartz - WA6HHQ]

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, [hidden email] 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
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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