[Elecraft] Humming KPA500

[F5vjc]

Switching or variation of load on your AC supply?

On 3 September 2017 at 00:43, pkhjr via Elecraft <elecraft at mailman.qth.net>
wrote:

> Mine does the same thing.  I opened it up last year and could not find
> anything loose.  Would like to get it resolved.
>
> Tex ka5y
>
>
>
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