"Yamaha" G100-212 II Guitar Amplifier

Updated August 7, 2026

Professional Yamaha G100-212 II solid-state guitar combo amplifier housed in its original heavy-duty rolling cover/case. Manufactured during Yamaha's highly regarded late-1970s to 1980s "G-Series" era, the G100-212 II has earned a loyal following among gigging musicians for its exceptional clean headroom, roadworthy construction, and warm analog solid-state tone. Delivering approximately 100 watts RMS through two original Yamaha JA3066 12-inch speakers, this amplifier provides the volume and projection needed for rehearsals, stage performances, churches, clubs, and studio use while remaining highly responsive to pedals. Features include two independent channels with separate volume controls, active EQ, Bright and Fat voicing switches, onboard reverb, parametric EQ, master volume, high and low inputs, external speaker output, direct output, effects loop connections, and a convenience AC outlet on the rear panel. The amplifier has been tested and is fully functional, with all controls operating as intended at the time of cataloging. Included is the original Yamaha padded vinyl rolling cover/case, fitted with integrated casters for easy transport and added protection, a valuable accessory rarely found with these amplifiers. Overall condition is very good for its age, showing normal cosmetic wear from regular use including light scuffs and minor finish wear to the cabinet and cover, while the control panel, grille cloth, and original speakers remain in attractive condition. The rear panel retains the factory-installed Yamaha JA3066 speakers, and the amplifier appears complete. Measures approximately 27 inches wide x 10 inches deep x 22 inches high. Highly regarded by collectors and working musicians alike, the Yamaha G100-212 II is a dependable vintage workhorse celebrated for its powerful clean platform, reliability, and excellent compatibility with modern pedalboards. Please review all photographs carefully to evaluate condition and included components before bidding.

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