\ Class T is just Tripath's trademarked implementation of class D. It's still a PWM based class D topology. Are they both the same preamps? Correct IMO. That's like comparing a Chevy Vega to a Nova, they are both Chevys but they are DIFFERENT amplifiers even if they wear the same nameplate. You could put the Nova motor in place of the Vega motor and the Vega still wouldn't perform the same as the Nova.