Mesa Boogie Mark VII 90-/45-/25-watt Tube Amp Head - BlackMesa Boogie Mark VII 90 45 25 watt Tube Amp Head Black The Mesa Boogie Mark VII is the "Magnum Opus" of Randall Smith's five decade career in visionary guitar amplifier design. This tube amp head includes three channels with three selectable modes per channel, enabling you to re create the full gamut of classic Mesa Boogie tones, including two modes new to the Mark VII. Each channel sports independent Gain, Treble, Mid, Bass, Presence, and Master