Just go Rogue and you will realize the promise of true high end sound value from a US company. No BS. Or go straight for Audio Research if budget allows. VAC is also cream of the crop it seems but won’t come cheap. Oh and do not forget good old Atmasphere. Or Conrad Johnson. The video did increase my appreciation for Prima Luna
The thing I see that does in most tube amps regardless of build quality with users is mismatching with other gear especially between amp and speakers and amp and preamp. If you get either matching wrong your results will be limited. Run the other way whenever someone tells you otherwise.
Otherwise I pretty much view tube amps like flavors of ice cream . The sound can come in all flavors and for a range of cost. Personal preferences will decide who likes what .
Reliability and customer support always matter as well and probably are more important things to consider than which specific “good sound” to choose. I agree it’s hard to find a bad sounding tube amp after all. Cheap or poorly made….for sure. Plenty of those. Cost alone is not the determining factor of course.
But if you want true good sound, performance comes first. Lots of details that go into that. When in doubt, stick with the well known products and vendors that have a long and wide reputation, not just a particular cult following on the internet.