No reason to beat up Nordic, we should welcome newcomers to the forum. Two comments on postings so far:
(1) Class "T" is really a class "D" amp. Tripath was one manufacturer of chips for the technology, and ARC called their amp a class "T" simply because they used the Tripath chip for their 150.2, 300.2, and 150M amplifiers. When Tripath went bankrupt and the chips were no longer available, ARC discontinued those models. The new ARC class D amplifiers, their "DS" series, use in-house developed chips, so the class "T" designation no longer exists.
(2) As was mentioned earlier, the combination of tube preamp and class D amp is primarily a matter of synergy. In my case I use all ARC components, and, at least to my ears, the combination of an LS-17 tube pre feeding a class D 150.2 and Maggie 1.6QR speakers, sounds very good. Of course, ARC components are made to mate well with each other.