For tube systems, the criteria begins with high speaker sensitivity. I have auditioned many brands and models and owned a number of models. I have two pair that will remain... at very different budgets:
Daedalus Muse speakers (95.5 dB SPL). Meticulous wood finish and wonderful sound in their price range (<$10K). They hold their own and surpass any models I've ever heard in their price range. Lou, the artisan / designer is a highly-regarded veteran in the audio industry and is directly involved in the building of each pair. I'll add that I know a number of well-known dealers / distributors who personally own his creations as their personal end-game choice. If your budget allows, his Apollo speakers take it up to another level. But the Muse are gems.
Tobian 12 Signature Horn speakers (99 db SPL). Handmade in Switzerland. Works of art. Beautifully musical, meticulously custom-built. Priced at around $45k (maybe a little more due to tariffs), I haven't heard anything that outshines them at twice the price. I am using a pair of 300B tube mono blocks and a pair of 45 tube monos. Imaging and detail are show stoppers. To inquire or buy, contact Mike at Suncoast Audio in Sarasota, the importer.

