[MrFixr55]

HI KBLF,

Easiest way is to check the fuse. I expect that it would be between 7.5 and 10A. For a 6 tube radio, i expect that the filaments alone would draw a total of 3.6 -5A. Throw in another amp or 2 for the vibrator and plate supply. I would think that 14 gauge would be more than plenty, especially if the pigtail is less than say 3 ft long. I would not be surprised if the cable was 16 or even 18 gauge. There are tables for voltage drop for various gauges of wire at given currents. For 14 gauge wire and a 10 A DC Draw, the voltage drop is 0.025V/ft. For 18 gauge, the voltage drop for a 10A DC draw is 0.032V/ft.

I agree with the others that various suppliers of wire for antique auto restorations will have the wire that you need. This type of wire was common in cars even into the early 1950s.