Mesa Boogie 1x12" Mark V Tube ComboIT TOOK 40 YEARS of Randall Smith's experience designing high performance tube amplifiers to get this much TONE under one roof and keep it easy to dial. More than a collection of amplifiers, the MARK V is a living history of MESA's contributions and a tribute to the evolution of electric guitar tone. The MARK V is really a collection of amplifiers. There are far too many circuits and sounds to think of it as merely an amp. It is also a living history