Speakers that are good with tubes

Legacy Audio, Goldenear Triton Ref's or 1.r's.

Spatial Audio Lab X5s and X3s. High efficient, open baffle speakers you can drive with 2 plus watt tube amps. 

I use Klipsch Cornwalls with a 45 SET amp............. about 1-1/2 watts.

Couldn't be happier!

Aacoustic Zen Crescendo Mark ll.  They hold steady at 6 ohms for almost every frequency.  Not sure of another speaker that comes so close to being the perfect speaker for a tube amp.  Huge power is not required.

Find speakers you like , then the tube amplifier! If you buy a 10 watt amp you are restricting your choice of speaker, massively. I tried for years finding high sensitivity speaker I liked, never found one. I use Audio Physic 89dB 4 ohms, with 40 watt amp, actually all listening done in better 22 watt configuration, more than enough power.