You Zingalis have the efficiency for not needing many watts (tube or ss) but if they have any severe dips in impedance and even worse, a bad phase angle in the lower ranges, a tube amp may not be the best choice. Most tube amps do not like dishing out a bunch of current at a moments notice, the Pass couldn't care less.
A tube preamp would be a step in the right direction. A tube amp may be a bigger step toward your goal.
A tube preamp would be a step in the right direction. A tube amp may be a bigger step toward your goal.