imho, your V1 tube is going to have as much to do with your sound as your pickup, or your speaker or anything else, and one of the cheapest MAJOR upgrades one can make to an amp . A JJ ECC81? Obvs I already opined that I don't care for JJ or any new Russian/Serbian/Chinese preamp tubes I have tried ( I think JJ or Svetlana 6L6's are decent, but then again I am an SS power convert and have probably never used any real "premium" output tubes)... but most any 81(=12at7) in V1 will probably sound lifeless to you if you are a dynamic guitarist and like to be able to dig into the strings for a bit of overdrive. If you want a less "dirt", a less drastic approach would be to try a 5751 in V1, preferably a JAN G.E., with the green printing. Very hi-fi sound; I tried it for awhile but went back to the hotter, greasier 7025's.
"There, in huge black letters, was 'The Grateful Dead'. It just... cancelled my mind out."-Garcia