The YMJ100 amp top is based on the tone of the 'Holy Grail' 1959 Plexi head, the many features of the YMJ100 include a foot-switchable noise gate, series FX Loop and studio quality Digital Reverb with rear panel level control. The YMJ100 has a half power switch that shifts the output power from 100W to 50W when engaged, as well as a built-in variable Attenuator control, which can take the output stage from anywhere between 100 per cent to 0.01 per cent. If one of the output valves encounters a fault, the valve failure circuitry feature will indicate so on the visual indicator on the rear of the amplifier. Yngwie Malmsteen is known for his love of M Limited Edition Signature Series 100-watt Amp Top