[Hammarlund] Hammarlund power ground

[Mike Taylor]

Hammarlund manuals say that if there is objectional audio hum, reverse the two wire plug at the outlet. I've never noticed any difference one way or the other. Does this have anything akin to the use of a two wire plug that's polarized? Also, what is the difference between using a three wire plug with the green wire connected to chassis, or connecting the "G" terminal on the antenna input strip to a good earth ground (copper rod driven into the earth or water pipe connection)? Either way, your connected to earth, so what's the difference?