That explanation is close. Tube-type electronics requires two different types of electric power, one to heat the tube filaments and one to power the electronic functions. On vehicles, the battery voltage powered the tube filaments directly. The filaments took a little while to get up to temperature, thus the delay in producing sound when turned on. The operating voltage is known as "B+" and is typically in the range of 90-120 volts DC. The vibrator converted the vehicle DC to AC which was then fed to the transformer and increased to 120 volts (AC), then rectified back to 120 volts DC for the B+. The rectifier was frequently an OZ4 tube, a gas rectifier with no filament. They were the most frequent tube to fail. I used to use an old TV transformer to stepdown the 120 volt house voltage to 6 volts for the tube filaments, eliminating the vibrator, and play the radio on household power. Those radios filtered out static much better than the cheaper "All-American 5" household radio circuits that became so popular because of low cost.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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