Yesterday such a white ring was found at the size of a very large coin. Where had it come from?
It may prove very suitable for winding an "air" ring core Pleiades (R,L) filter with R made up bungle reaistance of the very long wire needed for given inductance, say 40mH.
Advantages: No hum due to toroidal shape. No magnetic saturation. Resistance ie gentle high pass slope. Ready to just connect to pins 2 and 3 of a balance signal path. Usually directly accross mic's output.
Disadvantage: A patient tortoise is needed for winding it.
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