Toroidal Isolation Power Conditioner

By their nature, toroidal transformers have a much wider bandwidth than EI transformers, meaning they pass more high frequencies than an EI would, while both will pass the fundamental AC frequency well (60 or 50Hz). The goal of an isolation transformer used as a filter is to block as much of the HF hash as possible, preventing it from getting into the connected equipment, so it stands to reason that a more lossy transformer would do a better job of that.

Not saying a toroid with an interwinding screen won't do a good job, but I don't see any reason to fixate on a toroid; an EI can do as well or better for filtering.

Here's one man's thoughts on the subject of EI vs Toroid:

http://www.soundstage.com/maxdb/maxdb071998.htm

Another data point to consider:

http://www.audialonline.com/online-topics/psu-transformers-ei-vs-toroidal-and-more/

Note the graph showing the bandwidths of the various transformers tested and the discussion that follows.

Ait. Sorry to disagree. Check the Equitech website to learn what many many 'extreme' hi-tech companies know. End of conversation thanks.

End, indeed. The facts speak for themselves.