[Elecraft] KPA500 Hum

[AE0MM]

John,

When my KPA500 hums, I assume it is a power quality problem.
It only hums when a curling iron or coffee maker, both of which are on different circuits, are in operation.


--mark/ae0mm


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, January 4, 2019 8:14 AM, John_N1JM <johnn1jm at gmail.com> wrote:

> Thanks Bob. Yes great amp.
> 73, John N1JM
>
> Bob McGraw - K4TAX wrote
>
> > Yes it is normal to hear a slight hum when the Mains switch is on.  Also
> > the left side may be slightly warm.    When the Mains switch is on, the
> > low voltage power supply is on.    This supply is for the logic and
> > processing.
> > See the IMPORTANT section on page 14 of the manual for further details.
> > Wonderful amp.   Love mine.
> > 73
> > Bob, K4TAX
> >
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