I have used a PP Leben tube amp, a couple of class D amps, a SE 300B amp, and now a First Watt SIT2 SE solid state amp with my Alnico Super's. The SIT2 was by far the best over all. The 300B had some magic that the First Watt did not however the bass was just too flabby. The SIT2 is just spooky in it's clarity and tonal purity.
I am going to ad a DHT tube preamp in the next week, A single 301A directly heated tube with a transformer output, to see if I can add just a pinch of tube DHT goodness.