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 - It's Alright Where It Is! - by Anthony West. I have a tale of a different kind to tell. Whilst rooting in the hedge bottoms this week I had cause to visit Chapel lane Farm, the home of an eccentric gentleman by the name of Austin Kendall. I had heard rumours that an old Case Model C was languishing away in the back of one of the outbuildings there. So off I went in search of what would turn out to be a very rare and unusual tractor. Mr Kendall is an excitable chap to say the least. He is amongst the last of a dying breed of farmer who
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