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an I raise the 200uF values simply by installing a film cap across each 100uF pair?

Right now, don't you have three (3) 100uF caps in parallel on each phase of the bipolar HV supply? Any film caps you wire up in parallel with those electrolytics will add additional capacitance, but because the film caps are likely to be small in value compared to 300uF (the net of three 100uF caps in parallel), the film caps won't add significantly. For example, if you use a 30uF film cap, which would have a hope of being audible, the final total capacitance will be 330uF. Some would also bypass the main film bypass capacitor with increasingly smaller value film caps, down to 0.01uF. Some would not.


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