Tube Pre/ Class D Amp - Who has done it?

I have had a pair of ADG Class D monoblocks in my system. My preamp is an Audio Research Reference 6SE. I was really impressed at the  sound for the money. 

One thing, I will say, that when you take out one piece of equipment with a very synergistic system... that one piece tends to sound as good as it ever could. So I had all Audio Research electronics a substituted just the amp. 

But sounded great for the ~$9K

I had ARC sp16 and Bel Canto ref1000m monoblocks for many happy years. Moved on to newer Class D and dropped the tubes.

It was a very”musical” combo I could listen to for hours, but slightly rolled off high and low end extension, and slightly limited dynamics air and detail.

I recently bought a Marantz PM10 for my summer home, but had it shipped to me at my Florida home first to check it out.  The PM10 was used in lieu of my Conrad-Johnson ART 27A which is Class A, and I used my C-J ART 88 as the line stage.  My speakers in the system are Sony SS-AR2, which have a rated efficiency of 89 db at 1 meter and are a fairly easy load.  So the PM10 was not driven very hard, but in terms of sound quality it acquitted itself very well.  The PM10 line preamp section did not compare as well and so I did not bother to compare the phono stages.  The ART Phono is one of the great phono stages.  When I took the PM10 up to it's permanent home and connected it to B&W 802 Diamonds it worked much harder, but also sounded quite good.  This has been my first experience with Class D amps outside of subs and it has been very satisfactory.  A good tube pre connected to a Class D power amp can be a winning combination. 

I have a system with a tube preamp (ProJect Pre Box RS2, selectable tube stage) and a Class D Purifi amp (NAD 298). It is a very good combination.

Macintosh 12000 tube/ ss pre hybrid,either ss or tube.mcintosh class d mi1502 500 watt/ 1000 hypex class d with good synergism.enjoy the music.