I have not tried these amps on the ML's, but I do own a MV-55. The amp is not switchable between triode and ultra-linear operation, it must be hardwired one way or the other by the factory (or a c-j approved tech). c-j reports that a high number of buyers who opt for the half-power triode option are not happy with it in the long run and have their amps converted back to full-power ultralinear, but I have not personally heard the triode version. I can report that the regular version sounds exceptionally good as is, and I do not wonder about triode. I can also report that I have auditioned triode-switchable Air Tight tube monoblocks on SoundLab DynaStat hybrid-electrostats, and the regular-wired output switch position was clearly preferrable with this combo (the system's owner concurred). Knowing what I do about the MV-55 (and the CAV-50 being essentially the same amp), I would not doubt its ability to drive the small ML's adequately to moderate lisenting levels in a comensurately-sized room, and to sound very good doing so, but as always, do arrange an audition in your own room before you buy, if possible.
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