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Although I have seen plenty of 100 ufd, etc. capacitors at 450 volts, I have not seen many above this rating. This is why I picked up the 33ufd at 500 volts when I saw them. These were the largest values the seller had and , according to the seller, they were the last production of the 500 volt ones.
450 volt caps might work, but if the voltage surge is above 450 volts, failure might occur. I suspect 475 volt caps were specified for a reason.
As to my 500 volt caps, they are Chinese made, so I am not sure of the quality yet. I have used one in restoring an Admiral B&W TV where a 475 volt cap was specified and had no issues to date. I just finished the restoration, so the jury is sill out.
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