Relationship of amplifier sound to transformer quality?

"Magnetic field outside of toroidal transformer is theoretically zero. It is completely contained inside of the core. Toroidal transformer has no gaps making it more sensitive to presence of DC voltage."

Theory doesn’t seem to hold for a lot of things in audio. I wrapped a toroidal transformer, the aftermarket transformer in my uber modded Oppo 103, and heard good results. Maybe it doesn’t take much leakage to be audible, who knows?

Does anyone know who supplies Levinson,Spectral or Boulder?

The heavier the better!

True for bass Don, but that compromises the highs. As in most things Hi-Fi, it's a balancing act. That's the art of transformer design.

if the transformer is hand wounded using high quality silver wires with iron-nickel alloy in Double-C configuration, will this give deep bass without compromising the highs and still sound quick & agile?