I like tubes. When I went to Engineer School they were current technology. If I had a choice I would still be using full tube amps. BUT age crept up on me and my tube amps just got to be unmanageable. Something had ti give. The route I followed was a 2KW capable class D Stereo power amp to drive my Acme Sound B2 2x10 three way cabinets. I usually use two in a vertical skinny stack at 4Ω per channel. If I want more I can run all four for 2Ω per channel. I designed and built a two channel tube pre-amp to drive the power amp and the whole system sounds very good.