The Streamliner STM-600 bass amp head from Genz Benz boasts a 300-volt, all-tube Class A preamp driven by three 12AX7 preamp tubes utilizing six gain stages. The preamp design features an intuitive and highly effective tone network which is a unique blend of a modified passive Baxandall network for the bass and treble along with an active, tube-driven mid filter with selectable mid frequencies. The versatile all-tube preamp exudes a fat and rich tone that remains articulate. It can be used to simply add warmth to your natural tone or it can be dialed in to provide a wide range of natural tube overdrive.The Streamliner 600 also features proprietary 3 Dimensional Power Management analog technology that adds heft and girth to each individual note while enhancing the amplifier;s responsiveness and headroom. It provides the dynamic and three-dimensional tone and feel of an all-tube power amp design.With its solid extruded aluminum panels, CNC machined solid billet aluminum faceplate and smooth-radius edges the Streamliner 600 chassis emanates the ruggedness and strength of a world-class touring machine. This brushed aluminum chassis is finished in an anodized Gun Metal Blue color.Simply put, the new design of the STM-600 offers a more streamlined approach to finding your voice, yet it still carries forth the GENZ BENZ reputation for performance, reliability, and innovation.