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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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