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More research & an article by Lynn Olson

I researched further into the subject matter, and found an article by Lynn Olson. It appears that I should use 4 chokes and a CMC.

I quote"

If you were really hard-core, there would be four chokes: a pair on the high and low-side between the bridge and first cap, and a second pair on the high and low-side between the first and second cap. The first pair, since it emits magnetic noise, would be physically isolated from the audio circuit (on the far side of the chassis, close to the dedicated filament transformer), and the second pair would be close to the DHT, since it is part of a LC filter circuit. Another improvement would be to insert an RF common-mode choke of the type seen in the input of computer power supplies. This would reduce the common-mode RF noise that can sneak through the large power-frequency chokes."


http://www.clarisonus.com/blog/?p=169


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