[radiomikee]

Just because the field coil is rated at 40 mA does not mean that is how much current is actually flowing through it. To measure the current flowing through the field coil, put the VTVM in series with it and measure the current flowing. The power being consumed in the field coil will be the current times the voltage drop across it, on the order of 2-3 watts maximum. This power is used to generate the magent field for the speaker, and a small amount of heat. Given the big metal shaft through the center of the field coil and the air in there, you will not feel it as heat. For interest, go back and check the power draw for the entire radio. It's about 80 watts to my recall, not having the radio in front of me. The rated total plate current for all the tubes is 35 mA. On an average plate voltage of 250 Volts, thats about 10 watts. If you study the plate current draw per tube, 80% of the power is used by the audio output tube 47. You could also figure out the amount of power used to heat the filaments of the tubes, that's about 5-8 watts per tube depending on which one. Most power in the set is consumed heating filaments and as audio power, with small amounts consumed in the speaker field coil, and some wasted as heat passing through dropping resistors, the main choke out of the 80 rectifier ahead of the field coil, and in the dial lamp.