Hoots, SH put a bug in my ear, and for a $100-150 "intro" to tubes, I'm going to try one of these:

http://www.behringer.com/02_products/prodindex.cfm?id=T1951&lang=eng

I get to keep all my ss stuff, and just see what the effect of tubes would be. ("Poor man's" version.)

And, I get a parametric eq for my mains. (I have a pro Symetrix 552E I've never had a chance to install in my system. Taming room nodes and stuff, not trying to make a perfectly flat response or anything.)

The funny thing? Behringer (to me) is most well known for their DSP1124 Feedback Destroyer, which is a digital parametric eq useful for eq'ing subs. But the T1951? All analog baby!