[Elecraft] KPA 500 Hum

[n5ge at n5ge.com]

Klaus,

Are you sure it is the KPA500?

My computer speakers in the shack will hum when using any of my HF amplifiers on
CW.

73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member


On Mon, 1 Aug 2011 07:33:05 +0000, Klaus Koppendorfer <KK at ccf.net> wrote:

>
>Last week i assembled the kpa500 of oe6rdd
>when we transmit we hear a realy loud hum (50hz) in the rythm of the cw signals
>
>i have compared this with my own kpa-500 and there is no hum
>i have tried to loosen the big srew which holds the tranformer with no result
>
>any ideas ??
>
>73
>Klaus
>OE6KYG
>KX1 244
>K2 1331
>K3 115
>
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