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Had it been modern chinese garbage, it would probably be ruined; but, the old stuff is more forgiving. Even if you did fry parts, it's likely still worth repairing and the damage probably won't be that extensive.
On new capacitors, the negative lead is almost always indicated by an arrow with a "-" symbol inside the arrow that points to the negative lead. Older capacitors often have different markings; but, almost always have some indication of the "-" or "+" lead.
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