Masterbuilt Amplification Stone Groove. This item is used in very good condition, the label on the side is just faded.
 
Killer tone, massive boost and furious tube distortion! Easily adjust from mild bluesy gain to an incredible rock roaring thunder that fills the room. Enjoy creamy, warm overdriven tube tone from the finest oversized premium components that make microphonics and hum a thing of the past. This unit features volume and gain knobs with a switch that separately warms a balanced 12AX7 before operation. This switch prepares and keeps the tube ready for you when you are disengaged
 
Power Supply is included.