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RE: Tried "flywheel" filter + extra LC section with Triad C40X ...

If you are looking for a really quiet B+, you can get rid of the hash chokes. The little chokes are suggested for psychoacoustic "dynamics" or something.

4H -> 50uf ->4H -> 100uf given a critical load of 100mA to 150mA will give you a good starting point for an actual choke regulated supply. Use good chokes rated for 2X the current and low ESR caps. Download PSUII and play with it to get you to a starting point.

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