[Elecraft] KPA500 Hum when off?

[Harlan]

Jim
The KPA500 turns on the fan momentarily when you use the front panel on/off switch. I believe this is to bleed off voltage in the internal power supply. It is a design consideration not a problem

 Harlan
NC3C

Sent from my Verizon Wireless 4G LTE DROID

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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