Power conditioner types


Do any power conditioners actually store the energy from the outlet/power company and then generate it on demand or do they all filter the current as it is coming through?

Or is it more complicated than that?

If any do store it, are they a different class?
sokogear
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I know that my phono stage manufacturer, Sutherland, used to make one that was battery powered called the PhD which was popular back in the day. Not sure why he stopped making them, but it makes sense since they use so little power.
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