[Elecraft] KPA500 Hum

Tue Sep 27 00:38:20 EDT 2011

Twice mine has hummed loudly enough (always when off from the front, on from
the rear) that I looked for the noise, and unplugged it.  I guess perhaps
it's related to line voltage, which changes.  I will monitor line voltage
with my KILL-A-WATT meter and see if I can correlate it.

Leigh/WA5ZNU

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