Have you ever considered a Hybrid preamp and/or amplifier? You get the flavor of tubes and the power of SS without most of the heat. My first taste came from an ARC SP9mkll. It uses 6922 tubes for its input stage and SS for its output. (I still love its sound) And now I am using PS Audio BHK preamp and amps. All three have tube input stages and SS outputs.
Just a thought.