Tite times with the rarest Gemini, the G-20. You know it’s old when it’s a BLUE LINE version, rather than the 70’s Ampegs which have the black screen printed front panel. Caps and transformers date this old Ampeg to 1968. It was running on GE power tubes and some Amperex 12AX7s. Not sure if these tubes are original but they are from the 70’s at least! Some 12AX7s were noisy and were replaced. The power tubes were still running but very unevenly matched, so they were replaced as well.
This amp has probably the best tremolo I’ve ever heard. The G-12 and G-15 have one 12″ speaker and one 15″ speaker respectively, the G-20 has two 10″ speakers. If you mention this amp in conversation almost no one will know what you’re talking about. Try it.
Chassis shot before recap for strength and stability, in these times.
Evidence of a previous heater to anode short circuit. Probably the most common short.
Old, old Linden, New Jersey pre-magnavox corporate buy out
Ampeg Gemini G-20 schematic