Hi Paul,

Fair-Rite makes what used to be sold by Amidon I believe.
Their material datasheet https://fair-rite.com/materials/ shows u=10,000 to be their type 76 mix.
For part numbers/sizes see https://fair-rite.com/product-category/inductive-components/toroids/
Digi-key and Mouser sell them, but only certain mix/sizes, so you have to sort for what might work.

73,
Roger

On Nov 20, 2024, at 6:00 AM, Paul N1BUG FN55mf <[email protected]> wrote:

Hey folks,

I am experimenting with MF and LF again.

I'm trying to source a few FT-37-WC toroids. They are .375 inch or
9.53mm OD, W material, epoxy coated. The only reference to such a part I
can find is Amidon. Of course FT-37-WC would not be what the
manufacturer calls these. Amidon prices and minimum order are currently
prohibitive. I would like to get the exact part if possible since I have
tested and know they work well in my application. Failing that I would
try a substitute, but I am unable to find permeability for "W" material.
Can anyone help unravel what these are, who makes them, possible
substitutes or sources in very small quantity?

73,
Paul N1BUG

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