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Regarding the commonly used Micamold, Sangamo, & Aerovox mica capacitors (low capacitance), These too, are injection molded capacitors & can also fail the same way as the larger paper capacitors. that is because of moisture can penetrate them & contaminate the foil that is used in them & cause it to deteriorate. although there may be no DC leakage unlike the paper types, the capacitance will change. i have seen this many times in recent years.
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