The heart of Balanced Audio Technology's VK-50SE is a new 6H30 "SuperTube." The 6H30 tube is a high-current low impedance tube that offers a substantial performance improvement over the industry standard 6922. Indeed, comparing the 6H30 tube to a standard 6922 is like comparing a Formula 1 race car to a family sedan. The 6H30 tube is exclusive to Balanced Audio Technology and makes its world debut in the VK-50SE.