The toroidal in my F5 clone hums surprisingly loudly. Virtually no noise at all through the speakers, but you can hear that toroidal humming away from 2 or 3 feet away. It almost makes a grunting sound when I power it up.
EI Vs Toroidal
There are various claims as to which is superior for Hi Fi. I read an article - https://www.audialonline.com/topics/psu-transformers-ei-vs-toroidal-and-more/ which states that from their research EI transformers sounded better than Toroidal...
Please read the article & let me know your views.
Please read the article & let me know your views.