Date: July 02, 2008 at 15:59:41 From: Greg Simon Subject: Re: Trannys for a Gibson GA-40 les paul amp
"I'm not a complete expert on Gibson amp production years, but I think the change in cabinet design was around in '60."
I believe it was '59...My uncle has a GA-20T that has the new style cabinet and it's pots are dated to 1959, and it is all tweed with the slanted front. A great sounding amp for sure!