I'm looking to do a total tube replacement for my Vox AC15C1 amp. I got the amp about a year and a half ago brand new and loved the amp when I first got it. However, it's been giving me staticky/popping sounds intermittently and the overall tone has seemed to decrease. The volume will also give out mid playing. I bought the amp from Sweetwater and contacted them regarding this a few months ago since it's still under warranty. They sent me one pre amp tube to replace. Once I did, I could immediately hear and improvement in the sound. Since changing just one made that good of a difference, I now want to replace the entire set. I really like the classic Vox sound. The tone I'm looking for is a clean, full tone, that has a bit of grit when pushed. I don't want anything too tinny. I've narrowed down the preamp tubes to a Genalex Gold Lion 12AX7 Gold Pin Preamp Tube or maybe the Mesa-Boogie 12AX7 Preamp Tubes. (Power tubes would be either Genalex or Mesa-Boggie EL-84's). What do you recommend? Any help would be appreciated, I'm kind of at a loss as to what to choose. Thanks in advance!