[Elecraft] KPA500 - transformer low level hum

[Eric Swartz - WA6HHQ, Elecraft]

This is normal at this power level.
73, Eric

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On 9/16/2011 7:11 AM, Johnny Siu wrote:
> Hello Group,
>   
> When the KPA500 is operating, I notice that the transformer is vibrating and gives a low level hum.  Is that normal? Can the hum be reduced?
>   
> Any ideas?
>
> TNX&  73,
>
> Johnny VR2XMC