Thanks to all that responded on and off reflector.
Problem appears to be cockpit error on my part and fuzzy
instructions in manual. I connected the chassis ground(green wire)
to 220 V neutral in wiring the plug. Since the Henry load is
unbalanced(to run the fan etc.) thus causing the neutral to conduct
such that I apparently created a ground loop causing the hum. I
corrected the plug with neutral wired to neutral and can now
detect practically no hum in tests. The amp chassis is connected
to the station earth ground.
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Ron Schuster N9rc
Cincinnati, OH
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