Anyone running a tube preamp with a Pass XA25?


I've got a Pass XA25 and an XP12, great combo, no issues. Having said that, I'm curious how a tube pre might play with an XA25? Anyone running a combo? Thoughts? Impressions? No need for balanced out, a line stage is what I need. Thanks all!
geof3
Sure, many great tube preamps avail. I’m looking for specifics with the XA25... 
Absolutely.... My Pass XA25 is fed by an Aric Audio Special 6SN7 linestage. Stellar match!
@geof3 -- i don’t have your pass but i can vouch for the wonderful et5... it is a keeper for me

that been said, don't the current pass amps like balanced in better? maybe an audio research ref 3 or 5? they are wonderful too...