This is normal on the KA500 (and also on the KPA1500) and is due to slightly
different rates of thermal expansion and contraction of the heatrsink and sheet
metal connected to it. In general it occurs mostly when the amp is used in
higher duty cycle operation and will vary slightly from unit to unit.
73,
Eric
/elecraft.com/
On 7/18/2018 8:31 PM, Paul Antos wrote:
> I doubt that a phone recording has the proper range to qualify as a test device.
>
> I'll wait for the resident audio guru K9YC to set things a-right on a scientific test.
>
> The only time I get clicks on my very early kit built is in a RTTY contest, where I already have the fan at level two ... they are few and far between, doesn't bother me, and beats the heck out of other screaming banshee amps I have put up with.
>
> NS2N
> (Ex WB2ABD)
> No sign off message
>
> Get Outlook for Android<
https://aka.ms/ghei36>
>
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