A preamp tube that provides the maximum level of output and tone.
MESA/Boogie 12AX7 preamp tubes play a dynamic role in the creation of the final tone in your vacuum tube amplifier. Located early in the circuit, 12AX7s are components that determine how clean or lush, layered or massive the high gain will be—not to mention all the tonal shades of grey in between, like clipped, overdriven and crunch sounds. MESA/Boogie 12AX7s provide the stability and high gain required for extraordinary distortion sounds while also delivering the sensitivity and brilliance needed for some of the world’s most detailed and crisp sounds, as well as the subtleties of the in-between gain ranges.