Hey... just sitting here listening to amp clips and something made me wonder: I've seen those walls of old Vacuum tubes in this world. The Thousands of tube varients and numbers and makes.... ...so why are guitar amps pretty much 99% 6v6, 6l6, el34 or el84? What if an amp company started to get wild and started experimenting with the tonal variations of some crazy power tubes numbers? Just a thought from a NON-tech guy. Thanks!