Hello,
As I recall from the Cyril Bateman, part 6 (10uF to 100uF) article, going with a bipolar electrolytic rather than a polarized one, with a larger capacity to keep the developed voltage down and a higher voltage rating all got distortion way way down when combined.
Also, two non polar electrolytic caps in series had less than a single one.
At the time he had to build the test gear as commercially there wasn't anything sensitive enough.
FWIW
Greg
As I recall from the Cyril Bateman, part 6 (10uF to 100uF) article, going with a bipolar electrolytic rather than a polarized one, with a larger capacity to keep the developed voltage down and a higher voltage rating all got distortion way way down when combined.
Also, two non polar electrolytic caps in series had less than a single one.
At the time he had to build the test gear as commercially there wasn't anything sensitive enough.
FWIW
Greg