I have a 1965 Ampeg B-15N that I love the sound of. I'm sure there are many who know it, full and tight but not very loud. They are cherished in the studio but rarely seen live. I figure I'd need 3 or 4 of them to give me the stage volume I need these days. So does anyone know how to get that tone in a louder format? I've tried lots of stuff: Mesa, SWR, Bag End, Acme, Sunn, GK... and have to admit utter failure. I guess the closest was a GK 800RB into a Sunn 2x15 but it wasn't really it. Any thoughts old-school warriors?