[Elecraft] hum in K3 when above 30W

[Don Wilhelm]

Have you considered that it could be coming from your power supply? Try 
another power supply or run it from a large battery as a test.

73,
Don W3FPR

On 1/31/2016 2:05 PM, NK6A-Don Minkoff wrote:
> I have a K3, Ser no 4569, that all of a sudden is giving me a 
> transformer like hum when I transmit above 30 W.  Does something need 
> tightening all of a sudden? This is a very annoying. Anyone else 
> experience this and find a fix?
>