Mesa Boogie Mark Series

The Mesa Boogie Mark Series of guitar amplifiers by Mesa Engineering. It is one of the most influential series of amps ever made[citation needed], and was Mesa's flagship product until the introduction of the Rectifier series. Introduced in the Mark II-B was the Simul-Class power amplifier stage, which combined tubes running in Class A and Class AB through the same output transformer.

The Mark I Reissue and the Mark IV were discontinued in 2008. New for 2009, Mesa has released the Mark V.