[Amps] Henry 2KD-5 120 Hz Hum (Solution)

[hamguy2]

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.


----------------------
Ron Schuster  N9rc
Cincinnati, OH
----------------------