It depends on the tube amp and room size as to which speakers sound good with tube amps.
I had a 20 watt Raven Audio tube integrated driving the supposedly tube non-friendly KEF LS50s in a medium large room and the sound was glorious.
Also a 100 WPC rogue audio amp with great success driving 86db Harbeths.
Flip side a 3 WPC SET tube amp likes much more sensitive speakers- e.g. 93db Audio Note AN-J or E.