Info from my "Noise" presentation yesterday for those who inquired:

#31 Mix toroids - These are the two inch diameter like I showed:
Mouser # 623-2631803802
Fair-Rite Part No:2631803802

Jim Brown, K9YC, paper on RFI and toroids:
http://k9yc.com/RFI-Ham.pdf

Steve, VE6WZ YouTube video on noise cancelling (You all need to watch this):
https://www.youtube.com/watch?v=Gt0Hokz_m3w