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I must say the rationale for 4-pole electrolytic capacitors has always eluded me. I think they are kind of a gimmick. I would love to know Ralph's take on them. However, if you follow the negative node in the schematic you posted, you will note that the negative output from the bridge rectifier ends up going to ground via the neg inputs and outputs of the caps. This indicates to me that the negative input and output poles on the capacitors must be internally connected, because there has to be continuity between the negative node of the bridge rectifier and ground, shown on the right hand end of your schematic. I could be only half right. Perhaps there is some advantage as regards noise or filtering, but nothing to go nuts over.


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