Mesa/Boogie Mark II

The Mesa/Boogie Mark II, introduced in 1980, was the first production guitar amplifier to feature a fully switchable lead channel with its own gain and master volume controls. Building on Randall Smith's original Mark I design, the Mark II added a footswitchable second channel and a five-band graphic EQ, making it the foundation for the high-gain tones that would define 1980s rock and metal. The amp's cascading gain stages produced a thick, harmonically rich overdrive that responded dynamically to picking attack, and the graphic EQ allowed players to sculpt the midrange cut that became the Mesa signature. Carlos Santana, Keith Richards, and Berton Averre of The Knack all used versions of the Mark II. It was succeeded by the Mark III in 1985, but the Mark II remains a sought-after amp for players who value its tighter, less scooped voicing compared to later models.