Yeah, I guess that's the more practical answer, rather than trying to buy every single piece of equipment SRV used.

One pedal that comes up a lot is the Ibanez TubeScreamer. I believe he used the TS-808, but there is a TS-9 which is basicallt the same pedal. The new ones have a different chip than the original, which some say affects tone. The original chip is a JRC3553 or something like that, and a new one can be modified (even by yourself) to use that chip instead. I found articles galore a couple of months back when I had bought a TS-9 and wanted reviews of it.

Basically, the TS is a clean boost type of pedal, but it can be tuned to introduce some pure-sounding dirt. The pedal is not too expensive. I thought it was OK, but it basically sounded the same as my amp's distortion channel with the gain down low, and I wasn't trying to achieve someone else's tone, so I returned the pedal.