The amp guru looks back on a career of modding Marshalls, building rigs for Eddie Van Halen, and developing his most simple product ever – and looks forward to the future of NAMM and boutique tech ...

The feature-packed reactive load box is reimagined with a smaller footprint that's ideal for the home recording enthusiast, and guitarist with a tube amp and neighbours ...

Part 5 provides spec summary of the GP/R K2-W vacuum-tube op amp and discusses measurement constraints/conditions and LTspice modeled output. The K2-W vacuum-tube op ...

This one uses two tubes from consumer grade TV receivers ... while the other triode-pentode serves as an audio amplifier. The original circuit from which this one is adapted is available online ...