Tacs,
Maybe you should have a bit more knowledge before you spout off? Rowland power amps have rather high input impedances, perfect for tube preamps. The Model 10 and 12 for example are IIRC 47kohm. Any modern tube preamp/linestage with even average drive output can mate with such an input impedance w/o problems.
I have used several different tube linestages with Rowland power amps with nary a problem; and much better sound than even Rowland's own Synergy II, which I did not like. But then, I have yet to hear a solid-state linestage that I like.