01-24-2014, 10:40 PM
The cord is referring to the power cord. A polarized cord like explained in another reply is one that has one wide blade and one narrower blade, the blades are the two metal prongs that go into the wall outlet. In this case you want the wide/neutral blade connected to the negative side of things in the radio to help with hum reduction. Like in one of the other replies some chassis have one side of the line connected to the chassis which is dangerous and needs to be connected to the neutral/wide blade.
Gregb
Gregb