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As to electrolytic values, older ones used round numbers like 20, 30, 50 mfd. etc. These days you won't always find round numbers like that but numbers like 47 mfd. This is the modern equivalent for an old 50 mfd. electrolytic and will work fine. Truth is, the old caps and the new ones may have a 20% tolerance, so either one could be higher or lower than marked, anyway. On a new cap stick with the old voltage rating or higher, and a microfarad value close to the old one or a little higher.
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Reece
Perfection is hard to reach with a screwdriver.
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