I finally got around to trying to power my Alnico HO's with my MZ2. Normally they are driven by my Z10.
The short version is that it works fine but I would not suggest it for filling a normal room. I could see it for near-field listening, acoustic guitar, or small jazz ensembles but to get the most from these great speakers the Z10 works much better.
The MZ2 however makes for a superb preamp, especially with NOS tubes and the LPS. It also runs very cool so that it is cabinet friendly and therefore has a high SOAF (Significant Other Acceptance Factor)