[Amps] Clean carrier-hum on harmonic

["Nils Petter Pedersen" <la7sl@online.no>]

Using an Acom 2000A.connected to a 20m Yagi,
 When listening on the carrier on a portable receiver,
attenuator on, short whip antenna, it sounds nice an clean.
2. harmonic on 10m has a lot of hum-modulation, I would guess
more than 50 % . And it is wide and noisy. 
The hum is power line harmonics sounding really distorted.
Any ideas ?
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