I have always admired VAC preamplifiers, but I have only ever heard their top of the line linestage, not the phono stage, at least not in a few decades. It was excellent. I am not so crazy about the fact that the website indicates the optional phono section uses six 12AX7s. There’s nothing so wrong with using a 12AX7 as an input tube for gain in an MM circuit, but I wonder how they manage to get enough gain for MC, and I am guessing they use an internal step-up transformer. This is suggested by the spec that says the max load resistance for MC is 470 ohms. That’s what you get if you put a 1:10 SUT in front of an MM stage bearing a 47K ohm input impedance. I am also wondering whether they use one of the 12AX7 sections as a
cathode-follower at the output. 12AX7 is very not ideal as a CF. Some of the other verbiage suggests they use transformer-coupling at the output, in lieu of coupling capacitors. That can be fine, too. But don't settle for my speculations; you need to do some further investigating, unless someone else here has direct experience.