There has been a megathread on this, it's a fairly common technique for "metal" bassists these days and yields some good results IME.
You want to use light SS strings, get the action very close to the fretboard, play really freakin hard, and turn down the treble on your amp
. If you have any tweeters turn them off completely, because this technique will sound very lackluster if you have squealy highs on your rig. Tube amps aren't necessary, but I can imagine the natural compression and grindy tone would make this technique pretty sweet.
I will look for the thread on this topic.
EDIT: It's a big read, but here it is...this was in the Stickies BTW Demystifying Metal styles, how to make fingerstyle playing heard in Metal