Tubes or stick with S/S

Several customers of ours have commented to us that our M-60s make the Tannoys sound the best of any amplifier they've tried. I get these comments but its rare that they tell me what the other amps are. It does appear though that if the amplifier is low distortion that the speaker benefits from having more power. When the power is clean it does not sound loud- IMO/IME that is a sign of a really good system.

If I had a pair of the K-horns, only one place I would be looking for an amp....one of Dennis Had's Inspire Single ended KT88 amps...they work great with efficient speakers.

Go with tubed OTLs with higher power. 30W per channel as a minimum. In my experience, OTLs are in another league when you compare them against SET and push-pull designs on higher impedance speakers. 

I have come to the conclusion the best compromise is to use Tube and Solid State in combination. Tubes for Pre-amp, and  Tubes for Power Mid range and Highs, and Solid State for Bass. This can be achieved by bi amp or Sub-woofer. I prefer Sub-woofers. I would recommend SET amp. There is no right answer - I guess. 

I've never seen a tube driven sub, so an all tube pre/amp system (as I have) with one or two (or a swarm) of solid state amp driven subs seems fairly normal, and using 2 RELs with the mains left alone works for me. The tube amp I use is a 12wpc or so single ended thing, and the subs total 250 watts...sounds sublime.