Toroidal power transformers seem to be the overwhelming choice for high end products. However as an example the entire Luxman line including the 595 ASE and the 20K 10x amp use EI transformers with great results. Does the choice really matter?
The components in my system that sound the best use R-Core transformers. These use a continuous conductor and have opposing windings to cancel out magnetic flux and have ultra low noise.
Toroidal transformers are quieter to a point, but the larger they get the more susceptible they are to DC offset. I was told it starts to be more common in toroidal’s over 300va. They can start humming or buzzing because of anything from a space heater to LED lights, especially when they are variable lights.
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