Mono Block tube amp or Stereo Tube amplifier?

Almandog in your current setup I would always look at keeping things simple therefore, a sweet midrange/treble stereo tube amp is preferred IMO. If your truly going to commit to a tube amp you really have to select an amplifer that will help bring synergy and sonics you truly want in the midrange/treble area. I agree, tube rolling will allow you to change the sonics for Legacy Audio 20/20 (nice speaker BTW).

I wonder how much you really gain with MONO amps in the midrange/treble in your current setup. Most great MONOS will cost a lot so look at price/performance ratio hence, stereo tube amp may be a better cost alternative. Tube rolling alone for my two MC275 run in mono...$800 plus to do it right.

The key here is the external crossover which has to deal with two different amplifiers and the potential gain mismatch. The independent output-level controls will have to balance the levels between the woofer and midrange/treble amplifiers.

Almandog, The Onix really is more a power amp than an integrated. I use a preamp in front of it and it sounds great.

Macrojack, is this why Rush uses tubes? My point is that watts is watts, and tubes do just fine with any type of music : )

Check out -Antique Sound Labs- Hurricane, 200 watts per channel in standard mode and 100 watts per channel in triode mode. They are monoblocks and should work well for your application. I have only heard them run full range and not on your speakers, but they sounded very nice in the triode mode.

Better seperation, less cross-talk, can be place very close to your speakers and away from the rest of your rig. Cons- two PC and access to outlets, long IC but short SC , cost more.
Small gain in performance.......but gain nevertheless. Monos don't guaranty good performance. The synergy and quality does.