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Clarification: the current rating is DC to achieve rated inductance.

Hi Alan,

The chokes are rated at a particular DC current because their inductance will be higher at lower currents and lower at higher currents. See the link.

The choke used as an AC filter will draw slightly less than 64 mA because it has no DC current. However, this does not affect its observed performance.

I expect you are getting improved performance from the 193M because of the higher Ohmic resistance of the winding. Two of them in series should work better.

Al

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