Marshall ValveState 100 amplifier, model 8100. This amp has a solid state power section and a tube preamp. This hybrid setup emulates the tone of a cranked power-tube section of a tube Marshall. It has a clean channel and an overdrive channel. The overdrive channel comes with two voicings and the clean channel has its own EQ. It puts out 100 watts of power with an effects loop. The amp has a very bell like clean tone and more gain than the traditional Marshall. The amp features a contour knob that when turned up emulates pushing the power section of the amp harder. This greatly effects the tone of the amp. The gain can go from traditional British overdrive to searing high gain. This is an excellent amp if your looking for great Marshall tone at reasonable price.