Good Toroidal Transformer recommendations?

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Yes sorry typo its Goss and as you say its purpose is to reduce the stray magnetic field. It may not be as good as MU-metal but its better than nothing
Alan
Oddly non magnetic materials like Copper or Aluminium have a shielding effect.
See Low noise PSU transformer
It is not clear how ? and how much ? It does exist, presumably because of Eddy currents ( aka Foucault current ).
 
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