Many tubes will do more aggressive sound than solid state.. Many think the tube nature is to roll of etc.. some tubes have wider bandwith and more attack than several of the widely used transistors on the market. Thats where tube rolling and synergy get sticky to know what direction you need to take things to make enjoyable music.
A question regarding "tubes"
This may me a dumb question but does all tube products (amps, CD player and pre amps) roll off, or softens the highs and gives up some bass slam.