Lots of talk about both of these on the Asylum. Here is one persons post on both of them:
Have both the GL reissue 12AX7's and the Pavane's; I also use these in the pre section of my Grant Fidelity A-534B (300B SET) integrated. I think they are both very good; the GL's may be a touch more 'vivid' and bold, with the Pavanes a slight bit smoother, but both are keepers IMHO.