i have a vintage 70's ampeg v4b. i am looking to retube it for maximum wattage and volume. i am not really keen on dropping tons of dough on the old 7027's. what is a good replacement with out any mods. i have been looking at tesla JJ EL34's and electro harmonix 6L6GC's. any input is appreciated. i run a jazz bass through a sunn 4x10 with an occasional big muff in a loud rock/noise band. thanks.