@OP. Given the way geopolitics are evolving, I would be concerned about the availability of 6H30 tubes. For what it's worth, I recently did an extensive A/B comparison of an AR Reference 2 Phonostage v a Pass XP 27. The Ref 2 was good - especially on simple material where it had that slightly larger than life presentation that I often hear in tube gear. But on anything more complex, the XP 27 was better - more detail, more refined tonally, and more dynamic.
That's a limited comparison in terms of the preamps, but it does give a bit of insight into as the AR Preamps and Pass Pres have a fairly consistent design philosophy, respectively. I have an XP32 and it's an excellent preamp and, obviously, works very well with the Pass power amps.