71.163.19.71
In Reply to: RE: Dual chokes? posted by Audiodyssey on October 18, 2009 at 22:02:01
These are power supply filter chokes, not plate chokes. They appear to only be rated for a 60VAC ripple, so probably cannot be used as an input choke in a choke input supply, but can be used between the first and second capacitor. Basically, you can use them at least four ways that I can think of. (1), use both sections in series for a 20H choke with 135ohm + 135ohm = 270 ohm DC resistance at no more than 140mA current; (2), a variation of the first for a more highly filtered supply, where you use the center tap (common) as a connection to a capacitor, so you have two 10H LC filters in series; (3), for a stereo amplifier, you can use only one choke and split the supply into seperate L/R B+ supplies using the common as input and feeding each power supply leg through one of the choke sections. Probably not as good as seperate chokes due to magnetic coupling on the same core; (4), you can parallel the two sections together for a 5H choke with a 67 ohm DC resistance and 280mA of DC current capability.
I hope that gives you enough ideas on how to use it. If you are only using RC filtering in your B+ supply currently, you really want to use a choke in place of the resistor. You will get much better filtering and probably a higher B+ (due to lower DC resistance of a choke vs a resistor that is more than minimally effective in an RC supply).
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