Re: Cathode material
The circuit board flux cleaning method can compromise the end seal of electrolytic capacitors. Perhaps that is what happened to the original Illinois ones.
Or they are Chinese knock offs. At one stage they thought they were doing industrial espionage, but were fed with misinformation with an incorrect formulation for the chemistry, with the effect that their look-alikes failed in precisely that way. That was sometime in the 1990's IIRC.
Craig
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