Because I have an obsessive need to try out all sorts of gear, I paired my Cornwall IVs with a nice Marantz PM KI Ruby integrated. What surprised me was I actually liked a Class D design at a "reasonable price" and the resulting sound is more than livable. It's a great pairing.
There's little chance I sell off my tube museum of gear and valves, but this experiment was a pleasant surprise. I have now tried them with push pull EL 34, KT88/KT120, KT150, 300 B, and Class A solid state, and Class D solid state.
Any of you out there in hifi land using a solid state amplifier with Cornwall IVs or a horn loaded speaker to great effect? I am appreciative to hear your experience.