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It's hard to find interlock cords today. Sometimes they show up at some of the surplus houses but there are various types of them, pin spacings, one pin larger, etc.
In the good old days with non-polarized plugs you could turn the plug over at the wall receptacle to see which way gave you less hum. Yes, the ideal situation for reception was to have neutral go to the switch to reduce hum. Whichever way was safer WRT the chassis is an ongoing discussion.
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Reece
Perfection is hard to reach with a screwdriver.
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