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lack of hum doesn't mean they are good, they could be shorted. you get hum when they dry out and have less capacity. if they short out, you don't get hum, you get smoke!
if here are wax capacitors they should be changes to they get electrically leaky as the oiled paper oxidizes and degrades. paper and electrolytic caps go bad from age, if they are not bad already, they will be soon.
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