Hafler DH-220/Transcendence - 220W/8ohm?

Anybody has an experience with this model?
It looks exactly the same as DH-220. The manual appears to be exactly the same -- the only difference I could find was that it says DH-220/Transcendence not DH-220, and the power rating is 220W/8ohm, not 115W/8ohm. The look, schematics, weight, and components used all appear to be the same.

What difference Hafler Transcendence models do make? How does it achieve double the power rating with all the same size/weight/components used in non-Transcendence model?
The "Transcendence" mods were done by Frank Van Alstine. Maybe send him an email.