Maybe you should ask the guys at the Planar speaker asylum. Here's a link to save you the trouble. http://www.audioasylum.com/forums/MUG/bbs.html
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Not a good match. I have a pair that I use as a back-up when my mains are in transition. I hooked them up recently to my McIntosh MC 2102 (100wpc into 8,4,2 ohms) and in my 20x 18 room they sucked all 100 wpc ( I know because the Mac has meters) If you have a small/medium sized room and play at very moderate levels, the 20 wpc tube amp might suffice.
Your McIntosh sucked, huh? You said it, not me.
MMGs are FINE with a tube amp. I used a pair (in a 25X30 room) with an ASL 50wpc tube amp and it worked great. I also used a pair of MMGs in a 10X12 room with a Forte Model 4 (50wpc class A) and it was a beautiful match.
Finally, I drove a pair of 1.6QRs with a 110wpc Audio Research D-115MK2 and it was INCREDIBLE.