What pre/power amp for jm lab Mezzo's

I'm not a JM Labs owner or dealer, but based on the dozen or so times I've sat down and listened to JM Labs speakers in my opinion they sound best with tube amps. If you're determined to stay with solid state, I'd suggest Levinson over Krell, and possible alternitives include Accuphase and Pass Labs Aleph series or current generation equivalent.

Duke

I have Ayre K-5Xe preamp and V-5Xe power amp with the JM Labs Diva BE and I just love the sound. Might want to give this combo a try.

Ok, not really up to date with tube design I have read that tube can lack bottom end slam, is it better to go for hybrid design, what the best brands for money (second hand)do you use tube pre with these, I am open to experiment, what your thoughts

I feel hybrids are the way to go. They achieve a natural balance and sound, along with great slam. I use Kora Aries monoblocks with my JM Labs and the synergy is like I have never heard before. Simply fantastic amplifiers. But they aren't common and don't get the press they deserve (at least in the USA).

I owned 3 JM labs including the Mezzos, always found solid state amps to be too harsh on the titanium tweeter, especially the Krell 400xi. Try the Mcintosh MA2275 or Airtight, or even the Jadis DA60 used if its within your budget. All 3 amps will easily drive the mezzo unless your room is too large.