06-19-2008, 08:43 AM
I've also thought that the older type wax-paper construction of these caps partially contributed to the higher voltage rating, due to needing a high value of capacitance.
Since the required capacitance was high (1uF and up) and a lot of paper dielectric was used, (paper is only 200 volts/mil breakdown), the thick paper by consequence, gave the cap a higher breakdown voltage, so that was the rating given in the Philco parts catalogues, even though the caps saw service in the 300-400 VDC ranges.
Chuck
Since the required capacitance was high (1uF and up) and a lot of paper dielectric was used, (paper is only 200 volts/mil breakdown), the thick paper by consequence, gave the cap a higher breakdown voltage, so that was the rating given in the Philco parts catalogues, even though the caps saw service in the 300-400 VDC ranges.
Chuck
Chuck Schwark,
The Philco Repair Bench
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