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Voltage rating of Vintage Oil Caps ?


Cut-Throat

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Those old capacitors in Klipsch vintage xovers are " motor starting " capacitors and would have a rating well in excess of 100 volts. One watt translates into something on the order of 2.87 volts ( help memory fade here is that voltage correct ?)
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2.83 volts @ 1 watt into an 8 ohm load. The voltage on motor start caps will normally be upwards of 120 volts depending on the motor circuit they're applied to. Audio usage won't push the voltage rating at all in most cases. For instance 100 watts into an 8 ohm load gives 28.3 volts. If you are using Heritage series speakers, cover your ears!

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Most of the oil caps I have seen in Klipsch Heritage speakers have been rated 100 V or so. But I did see a 50 V cap in a Heresy. Don't recall whether that one was before or after the autotransformer. You ought to be able to get away with a lower rated cap after the autotransformer because it reduces the voltage seen by caps after it. But there is really no reason to do so. The only thing that matters is that the rating be high enough.

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