I enjoy my Cary Audio SLP2002 preamp with my Pass X250, balanced XLR interconnects between them. No problems with Z match. I also have a Cary 308T CD player sporting a tubed analog gain stage. The Pass amp mates very well with these tubed components, makes my big Magnepan 3.6R's really sing. The tubes add just the right amount of warmth and seem to eliminate any digital grit and grain. Big Maggies love power and the Pass feeds them very well indeed.
match tube preamp w/Pass X250 recommendations?
what are some good matching (impedance?) tube preamps (balanced) for use with a Pass Labs X250.