One of the best sounds I have ever heard for anywhere near the price was at CES several years ago. A pair of KEF LS 50s powered by a Prima Luna integrated tube amp. The amps you mentioned are all good, especially the Pass XA 25, but all have an electronic edge.
If you are already leaning toward a tube preamp, go integrated tube! Put your money into a smooth, natural and musical foundation for a great sounding system you can build on and enjoy for years. Rather than trying to mix and match with mixed results, lots of cables and lots of money. The KEF/Prima Luna combination is a sure thing. And focus on upgrading your source. I would highly recommend even an entry level Rega TT and entry level phono stage and move up some in the Ortofon cartridge line. I have been at this game for 61 years.
If you are already leaning toward a tube preamp, go integrated tube! Put your money into a smooth, natural and musical foundation for a great sounding system you can build on and enjoy for years. Rather than trying to mix and match with mixed results, lots of cables and lots of money. The KEF/Prima Luna combination is a sure thing. And focus on upgrading your source. I would highly recommend even an entry level Rega TT and entry level phono stage and move up some in the Ortofon cartridge line. I have been at this game for 61 years.