Mesa Boogie evolved out of Randall Smith's experiments modding Fender amps in late '60s California. In the '70s, the Mark series of Boogie combos set a standard for high-end, high-gain guitar amps. Later, amps like the Dual Rectifier series, the Caliber series, the Lonestar and Maverick amps continued Mesa's tradition of amps to keep pace with modern Rock tones.