You won't do better than a Radford sta 25 with these speakers. If you heard Westlower's you wouldn't even be asking the question! It's not as simple as valve versus solid state with these Tannoys. Too much damping-Class D, solid state-and they clam up. Too little damping-too low damping factor and /or feedback-and the bass will disappear like a toilet roll in Tesco's during lockdown. So you need push pull, running Class AB, with the right damping factor for these speakers to show their best. There are solid state amps that will do the job, but they won't better the Radford /Tannoy combo