Tubes usually give you a “warmer” “fatter” and more rounded sound than solid state amps. I use SWR bass amplifiers and they are fantastic. My SM500 has a tube preamp that provides a warm sound. I am not sure what size SVT you are getting but I know the 450H is offered with a tube power amp and a choice of solid state or tube preamp. You might want to play through SVT’s in a music store and compare the tube preamp with the solid state to see which sound you prefer. I have played through many Ampeg amps throughout the years and was always happy with their sound and performance.
I'm not exactly sure what your asking but if you were to experiement with settings on your own that will be the best way to master the controls and get the sound you like.
