[fumplet]

from what Ive learned the emerson 415 was also used in 416 and 420. I think the 420 had a tube socket hookup out the back for the battery cord but same chassis otherwise. Yes it does have a 600 ohm choke. When radio was powered on the magnet and metal around it felt like a field coil speaker. The coil measured 970 ohms. Power to radio is 114.4 volts to obtain 6.3 volts at filaments using a 10uf 370vac run capacitor for a furnace. would be nice to have a smaller capacitor but not sure thats possable. I know a 25.2 volt transformer wouuld definetly work as I have the radio shack 1.2 amp 25.2 volt unit I can use which might be safer yet no heat and no short out that caps can do. My wall voltage is 122.3, which if directly plugged into wall gets me 7.07 volts at filaments with the 10uf run cap