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For the tingle, the chassis of the amp or maybe the tuner must be hot. Look for a capacitor connected from the power to the chassis. Look where the power comes in, on both the amp and the chassis. This cap (or caps) is (are) probably electrically leaky. If you find one or two, replace with "y" rated safety caps. if you find one connected across the line, replace that with an "x" rated cap.
There will likely be a few other paper caps in there that will need changing, too.
Regarding the turntable, I would bet on the wheel itself being dried out and not sticky anymore. I think this a more common failure than a spring.
The micromatic is a well-built unit, but it's tracking weight is fairly high by today's standards. Possibly consider plugging a modern turnatble and a phono stage into the Magnavox's phono inputs.
Oh, and welcome to AK!
John
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