The VX50 GTV features a Nutube, the new-generation vacuum tube. Using electro-luminescent technology with the same structure as a conventional vacuum tube, the Nutube has been featured on a variety of VOX and other products. The distortion and sense of compression that you expect from a vacuum tube, and even the response and playing feel, perfectly capture the feeling of playing a vacuum tube. In addition to the light-weight design that was unobtainable by a conventional vacuum tube amp, the Nutube brings additional unique advantages such as being maintenance-free and delivering amazing cost-effectiveness.