I would start with a Rogue Cronus Magnum 3. It’s not the quietest of amps but it does all the things that tubes are known to do well. It may fall short of some other tube and SS amps in one area or another but it’s pretty darn good as a complete package. It is in an entirely different league from Rogue’s hybrid tube/classD amps, the latter of which just sound like mediocre SS. The CM is one of my all time favorite amps. It has a very forward midrange but not in the obnoxious glaring way, but in a sense that it makes you feel like a artist is there in the room with you for an intimate performance. You’d probably have to move up to low power 300B tubes to do any better in this regard.
The CM is manual bias but the procedure is simple and doesn’t have to be performed often. Manual bias is also preferred by many designers as they claim it results in better sound quality and bias stability.