Nice score. You may be set for life on 12AX7's. Funny thing is that those Sylvania 12AX7's were not very desirable not all that long ago. You could get great testing UOS for 10 bucks or less and NOS easily for under $20 ... basically, the price range of current production tubes. The "audiophiles" wanted nothing to do with them. Now, they are magically much more highly regarded and probably the only folks who don't want anything to do with them are the ones who have a stash of Mullards, Telefunkens, etc. That's not to bag on the tubes, just making the point of how perceptions change given diminishing lack of choices.