[MrFixr55]

Hi Larry,

Back when this set was built, they did not use polarized power plugs. Technically, your chassis is sitting at about 60V above ground due to the small current across the caps in the bakelite block, C100A and B. Like Rod B suggested, if a polarized or 2 wire cord is used, Hot goes to the terminal of C100 that leads to the power switch.

Although it is certainly safe to attach a 3 wire cable to a transformer powered chassis, in this modern- day world of computers, the Internet of Things, LED and CFL lights, computers, digital TVs, carrier current meter reading etc., using the power line ground as a ground for the antenna may introduce EMI noise.