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

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.

I have an Atma-Sphere MP-3.3 tube preamp pushing Atma-Sphere Class D mono blocks and they're glorious. All the beauty of my previous Atma-Shpere M-60 amps without the 12 tube-per-monoblock paranoia. Speakers are Zu Druid Vs, not hard to drive at all but loving the headroom provided by 50 watts.

I have a Schiit Freya+ preamp with 6SN7 tubes feeding a PS Audio S300 class D amp into Harbeth 30.2 XD Speakers and a REL T/5x Sub. I like it.