Mesa Boogie 12AX7 PreAmp Valve / Tube (Single) Keyboard they offer added features for

they offer added features for increased portability

bright and responsive

In 1945 Bela Bartok described 'Mikrokosmos' as a cycle of 153 pieces for piano written for 'didactic' purposes

change patches

and panning

Mesa Boogie 12AX7 PreAmp Valve / Tube (Single) Keyboard they offer added features for12AX7 PREAMP TUBES 12AX7 preamp tubes play a remarkable, dynamic role in the creation of the final tone in your vacuum tube amplifier. 12AX7s are components, early in the circuit, that determine how clean or, how lush, layered and massive the high gain will be not to mention all the tonal shades of grey in between like clipped, overdriven and crunch sounds. MESA 12AX7s provide the stability AND high gain required for extraordinary distortion sounds