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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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