Has anyone replaced their 12ax7 preamp tubes with either the 12at7 or the spax7?
If so.. what were the major differences?
98' 1960 Les Paul Classic
00' 57' Reissue Goldtop Les Paul
92' R0' Historic Les Paul

Mesa Boogie Dual Rectifier Trem-o-verb 2x12 combo
Mesa 2x12 Rectifier Extention cabinet
Boss GT-8
Korg DTR-1 Rackmount tuner
Sennheiser WZ-300 wireless
probably just slight differences in tone. maybe buy a set of both and decide for yourself. besides, it's always a good idea to have some extra tubes laying around.