With series crossovers which use much smaller and far fewer parts than regular speaker crossovers, my loudspeakers are very easy to drive with tube amps. I have 8 push-pull integrated tube amps with EL84, EL34, 6L6, 6550, KT88 & KT90 power tubes with 12 to 80 watts per channel and a 300B amp @ 8 watts, a EL34 single power tube amp @ 5 watts and a Decware EL84 amp with 2.3 watts per channel that drives all of my speakers great in my 14 x 22 ft living room.
Happy listening... Fritz