piramis
Tube amplifier suggestion for 101 dB speakers
Tyler Acoustics PD30
You've got good efficiency, so you don't need a lot of watts, 50 would do, but these speakers are spec'd by the manufacturer at 4ohms nominal, and you can bet they go down to 3 or maybe even 2ohms somewhere. So I would look at tube amps that have a 2ohm output tap as well as the normal 4 and 8.
Roger Mojeski's Music Reference RM200 amp has this.
http://www.ramlabs-musicreference.com/music_reference_rm-200_hybrid_power_tube_amplifer.html
Cheers George