KSA 100-S toroidal tranformer versus square E & I

I had one with the cut core transformer. The only reason it was in the ksa-100s, was a shortage of the "torid" for the 100s. I sold it to a friend and it developed a hum traced to the transformer. They replaced it with the Toroidal transformer.
He never commented it sounded better.
Some believe cut core are better and some toroidal.
Good Luck,

millenium

thasnks millenium