tube amp, or SS,

I'm using a Belles350A ref, power amp, matched with joulet Electra 150Mkii preamp. sounds very good, but would like a more organic,liquid sound, thinking on going tube all the way, got my sight on a audio research,VT100mkii, what difference in sound would I get comparing the two? and would the joulet be a good match with the AR, amp, never auditioned an tube amp before, like any info before taking the plunge,thanks:"