I don't think it is going to work, at least at any realistic volumes. Those speakers like power in reserve.
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As a Dyn C1 owner (85db) I just bought an Octave V70SE and even with el34 tubes it has the CURRENT not watts which Dyn's do best with. Considering the Cary is class 'A' I think you'll like it. Mine is push - pull @70W with Kt88 and approx 49w with EL34's. There was a review somewhere (can't remember) when someone used the V40 with the C4's and loved it.
IF there is any way you could demo it in your home or take the C5's to a dealer that would tell you if it matches up to your expectations.
For some reason the Dyn's and tubes make a good match. On the other hand if you are talking solid state I still say look for good clean Current (yeah I know very few manufacturers publish current). One example is the Naim supernait (especially with the flatcap p/s) rated at 80w. Burmester is my favorite with Dyns but so far out of my budget. The Octave with black box was just outside my budget but I stretched and happy I did so.