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
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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...