Anyone out there have any thoughts on a '64 Gibson GA-20RVT w/"12. I've an opportunity to get one and am wondering what these things sound like. Up til now I've been using vintage Fender tweeds(champ,vibrolux,twin) and would like to know how this amp compares. It's a 12.5w amp.(very nice) I'm hoping it's sounds along the lines of a blackface Deluxe but would welcome something else as long as it's uniquely usable. Thanks for any help.