The GA-77 was a high line amp and one of the very first amps to incorporate reverb (but no tremolo). This amp is so rare, Gibson says it doesn't exist. There is no schematic anywhere to be found. Probably 26 watts or so into a single Jensen P15N. 15" speakers are out of fashion these days but those who know still seek them out. Condition is probably 8/10 and everything works great. Every bit as good as a Fender tweed Pro for one third the price. And you get reverb. Still has the foot switch. Three prong AC. Photos coming
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