[RFI] Fair Rite #31 Mix Material

[Paul Christensen]

I am looking for small toroid cores in a #31 mix to construct my own 
bifilar-wound CM chokes for audio RFI abatement applications.  From what I 
glean on the Fair-Rite website, #31 material is only available in a snap-on 
core type, elongated cable cores, and large donut cores.

Anyone know a source of small toroid donut cores in #31 material?  Do they 
even exist?  Is #31 material exclusive to Fair-Rite?  In addition to 
Fair-Rite, I tried Amidon and CWS ByteMark - and no luck there either.

Paul, W9AC