Tubed-amp power-supply question

Do we have any audio EEs here?

In a ‘pi’ filter with 2 caps connected by a choke, I’ve seen amps with some hi-quality (‘propylene and ‘styrene) capacitance in parallel with the choke. What’s the purpose of that?

jeffreybehr09-20-2004 7:04am

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jeffreybehr OP Details Discussions Posts This discussion Message User 805 posts 09-21-2004 at 03:13am Copy Comment URL Report Comment Edit Delete Awesome indeed. TYVM.
elevick Details Discussions Posts This discussion Message User 2,636 posts 09-20-2004 at 08:12pm Copy Comment URL Report Comment Edit Delete Herman, Awesome answer!
herman Details Discussions Posts This discussion Message User 2,252 posts 09-20-2004 at 01:14pm Copy Comment URL Report Comment Edit Delete A cap in parallel with a choke creates a notch filter, one that is tuned to and has a very high impedance to a narrow range of frequencies. By choosing values that produce a filter centered at the ripple frequency of the power supply, usually 60 or 120Hz in the US, the ripple voltage that passes through is reduced.

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