Well, my first guess would be tintinitis, what happens to many of us old guys, especially those who worked in noisy environments. TV used to have a real bad high pitched whine. 'Bout drove me crazy to walk past a display of tvs in a department store. Dont't know if they do still, or if I can't hear that high anymore. New technology has changed how the picture tube is powered. As far as the flourescents, they run at line frequency, 60Hz - most can't hear that low. Led lights if run all in one direction, would have a 60hz flicker, because they would be running on only one side of the ac sine wave, since they are diodes. However, I suspect they are made to run on both sides of the sine wave, to eliminate the flicker. My dad used to tell when they changed from 30 cycle to 60 cycle (they called them cycles back then), Said you could actually see the flicker in lightbulbs at 30 cycles. When they switched, the clocks ran twice as fast!
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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