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GK’s RB Series bass amplifiers have been raising the bar for more than twenty years. These compact, lightweight “superstructures” contain incredibly sophisticated and innovative bass circuitry. In 1972, Bob Gallien created G.I.V.E. Technology (Gate Induced Valve Effect). This “valve effect” is included in the design of all RB Series heads, and plays a part in their unique sound. The RB Series heads feature a warm, punchy tone with a fast transient response with superior sound and feel. GK’s legendary voicing filters and intuitive four-band active EQ make it easy to dial in amazing sound.