Speakers that are good with tubes

Blumenhofer FS1 speakers

If you like the sound of Maggies, but don't want or can't afford a 300 watt tube amp, look into the Eminent Technology LFT-8. Like Maggies, the LFT employs planar-magnetic drivers. Unlike the Maggies, the LFT is a tube-friendly loudspeaker, it's modulus of impedance 8 ohms and above. And if you bi-amp (two pair of binding posts are provided: one for the p-m drivers---180Hz up, another for the woofer), the impedance of the panels is 11 ohms, even better for tube amps. 

Klipsch KG 4s are a winning hand with tube amps. I sold mine and do miss them now even though I have a set of Klipsch Fortes I and its little brother the Quartets.

@hilde45

You can avoid the output transformer problem altogether by going with an OTL, such as atmasphere, or Futterman.

I use Altec 604Cs - 101db - paired with the NY Audiolab OTL3 version of the Futterman design, converted to triode.

Don’t listen to folks who haven’t tried any given combination. I ran my ATC SCM40 V2’s with a Line Magnetic 805ia and it was bliss—sounded convincingly like ATC’s own P2 which I also owned. There are class a high current tube amps that will drive many of the 6-8 ohm speakers out there easily.
 

The only thing with tubes is that they tend to lead you down the high efficiency speaker path at some point. I drive my Tannoy Turnberry GR’s with a 14 watt Line Magnetic and my Pure Audio Project Duets with a 1.5 watt SET amp.