[Elecraft] KPA500 Hum when off?

[Jack Brindle]

Jim;

Make sure the transformer is bolted down appropriately. If it works loose then it will cause the hum.

Jack Brindle, W6FB


On Jun 11, 2013, at 7:51 AM, Jim Miller <jim at jtmiller.com> wrote:

> I leave my KPA500 back panel switch in the ON position most of the time and
> use the front panel switch to bring it to life.
> 
> However in even when in the "Front panel off/Back panel on" state the
> KPA500 will occasionally hum for a few seconds.
> 
> Is this normal? Any suggested causes to worry about?
> 
> Thanks
> 
> jim ab3cv
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