Dave, my first car had a vacuum tube radio. Talk about squeezin blood out of a turnip, it had 6v battery and the tubes in the radio needed 300v DC. Also, had old tube type CB radio, did the same thing. Today, we use solid state, transistors and diodes. Back then we used an old tube called a multi-vibrator, it made a buzzing sound, that flip floped the 6 voltages in to a step up transformer, before converting it back to 300v DC. This technology may be older than you, perhaps older than most on YT. George
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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