Vox VT20PLUS 20-Watt 1x8 Guitar Combo Amplifier Tube-driven Vox Valve Reactor circuit uses a 12 AX7 vacuum tube for true-tube tone 8 User Programs for saving your favorite custom settings Amp offers Gain, Volume, and Master Volume; EQ features Treble, Middle, and Bass Unique Power Level control can limit the power amp output wattage, creating distinctive power amp distortion at any listening level. Built-in automatic guitar tuner