Just some old SVT questions: 1969-1972 was the blueline amp. 1972-1975 was the blackline amp. 1975-1979 was the blackline amp with white rockers. After 1979, it was redone in the black case? Where did the "vintage SVT" tone fall off? I guess I've always been under the impression that the best ones were made from 1969-1975, but what were the differences between all of these series? Is a white rocker SVT inferior to the series prior to it? Thanks for the help, SVT dudes.