Could someone explain where the FT240-31 designation for ferrites came
from. I do not see this in the Fair-Rite catalog or any manufactures
that use this designation as a part number. If you Google "FT240-31" you
will be directed to a different part number made by Fair-rite
I realize that it means a 2.4 inch diameter torrid of type 31 material.
So is this an industry standard for classifying the shape and size of
ferrite components, if so what is the standard?
Chuck K9LC
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