| tube bass preamp?
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Yeah, I play a Warwick pro fet 2 (125 watts 8 ohms, 250 watts 4 ohms) into a warwick 410 pro. It pumps out enough power and sounds good enough, but I don't generally get enough bass from it, I get a lot more twanginess from it. I like the clarity of it, but at the same time, I think a little more bass would benefit me. Enter the tube bass preamp - I have a couple old heathkit preamps for turntables/recording and the like, these are tube. It wouldn't take much effort to replace the tubes, as well as make it a little more suitable for bass - lower input impedance, lower pitched EQ, and a 1/4" jack output. I already have a solid state power amp that's about 150 watts/8ohms, so there wouldn't be much problem with appropriate power ampage.
however, I have a fender jazz that outputs a lot of treble through any amp - thought there seems to be better balance through tube rigs, would there be a change in bass response significant enough in overall sound to justify the work involved, or would I be better off doing something else? | 
Tubes per se do not change frequency response, any more than transistors do. It's all in how you design the circuit that uses them.
