[Reece]

Before looking at the schematic, I thought that set looked suspiciously as if it had a vibrator power supply; which it does. The transformer, rectifier, and vibrator are in the metal compartment. It's a farm set. It was made to be used also off the power line on a 6-volt car battery. Lots of rural areas still didn't have power in the late thirties, and even later. Sometimes they would use a car/truck/tractor battery, bring it in the house and run the radio off of it. Next day they'd put it back in the vehicle and charge it while running the vehicle. Or some had a dedicated battery that they would take to a garage to be charged when required. When they finally got AC power, all the farmer had to do was turn the voltage switch in the back of the radio and plug it in, goodbye battery headaches. Note that the schematic says that if the set is to operate on AC continuously, it is recommended to unplug the vibrator. The last user didn't do that. It's the round metal can inside the transformer compartment and is not used at all in the circuit when running the set on AC.

You can use a PM speaker with it. The loose transformer does appear to be the output transformer but can't see the secondary connections. It appears to be plugged into a socket on the rear of the chassis, common practice, but the schematic doesn't show a speaker plug/socket. Bad draftsman that day! It's got BC and SW, the latter not always seen in farm sets. By 1938 folks were getting antsy about Hitler so SW was very popular.

Reece