I need to know, when did they stop making the 400's and start the 400+'s? Is there a way to find out what year my 400+ is by the # or something?
Late 1980's. I wanna say 1988 but don't quote me on that. Call Mesa and give 'em the serial # from your amp and they should be able to tell ya.
The 400's and 400+'s are easily identifiable from one another if that's what you're inquiring about. If not...call Mesa.


