Relationship of amplifier sound to transformer quality?

EveAnna Manley is so convinced of this that they make their own trannies in house.

"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.