One of the most enjoyable combi's, or synergy I have had with power amp and pre amp tubes was when I had my Jadis JA 200 with 2 pcs of 12 AX7s and 2 pcs of !2AU7s input tubes mated with my Jadis JPL line stage which had 3 pcs 12AX7s and 1 pc of 12AU7. That pretty much explains my user name.
With that combination, I had Mullard 12AX7s short plate and Tele !2AU7s smooth plate for the amp and Mullard 12AX7s and Tele 12AU7 smooth plate for the pre amp. That really created a magical sound in my system, with a deep and wide soundstage, with lush mids, extended highs and 'tube-tight' bass (as opposed to SS tight bass)
For phone stage, I have been using 6922s all the time on my ARC PS. My fave is the Mullard military grade 2492/6922 goldpins, although the Amperex USN CEP 7308 sound pretty darned musical too, but they were not mine.
I'm a guy who chooses the tube gear, then the tubes. Unfortunately, my ARC VS110 uses Russian 6N1Ps for its input tubes, nothing much to roll over there.
The power tubes I replaced the stock EH6550s with SED KT88s, next dream is the Black Sable Cryo KT88s...