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To begin with while you have a working selenium in place, measure the voltage drop across it, the current running through it, and the shape of the rectified signal. Use the current, and voltage drop to figure out what resistor to put there..... And the scope pic of the wave after it, when you put a cap across it, compare the new picture to the old one..... Call it engineering a solution.
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Yes you can call me "Squirrel boy"
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