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I got a 300a too and measured the caps from 1976 and unbelievable they test ok, their values test actually higher than their ratings, how is this possible a 45 year old electrolyte capacitor not  deteriorating? Plus sadly it did not come with it's transformer box, please help me out and advise where to get this 300 volt 1.5A / 12 volt 3A transformer or replacement?