Does anyone know of a database that explains the differences between the earlier Marshall amps like the Plexis? and the various models of 800/900? I searched this board, but the only thread I found was like 14 years old and the links were dead. Looking around all I could really find were things like company histories, I'm trying to improve my Marshall knowledge, especially when it comes to the earlier amps from the late 60s/70s. Anyone know of anything? Thanks.