I recently stumbled upon a small lot of vintage Sprague and the like electrolytic capacitors, and after measuring and sorting I am left with quite a few with super short leads or totally out of spec. The ones I kept were basically within 20% of printed value; but many were double the printed value or more.
From what I understand, especially, old electrolytic caps go bad usually due to the deterioration of the dilectric. Is that what would cause their capacitance to increase?
Are these worth keeping and potentially using, even so out of spec?
(Not intending to rekindle the debate over MOJO or NO-JO, let's just assume some of us like handling the old stuff for kicks)