All of our amplifiers are hand built, meticulously constructed using the point-to-point method, without reliance on Printed Circuit Boards. All output transformers are custom made for our amplifiers. A special circuit has been designed to prevent damage to transformers should a speaker cable become disconnected. The amplifiers are self-biasing, meaning you never have to manually adjust the tube bias. These features are unheard of for amplifiers in our price range.