Quote:
Originally Posted by rotorwrench
They hadn't started using a vibrator circuit yet to step up voltages with the pulsating DC into a transformer. They used a DC Dynamotor that works a lot like an inverter to step up the low DC voltage to a high DC voltage to make the tubes work. These were used clear up and into WWII and later for long range recievers on aircraft and ships.
The Carter Genemotor was one of the brands of the day. Pioneer, GE, Black & Decker, Electrolux, and other motor manufacturing companies made Dynamotors.
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Years ago I was restoring a 1936 zenith radio that was a 6 V farm radio. It was amazing how such a simple technology using a vibrator circuit could enable a 6 V tractor battery to feed and make a tube radio work. They were truly genius in the day.