Based on the original Electro Harmonix hot tubes pedal, this tube-less version provides all the tone and versatility of the original. It can be used as a clean boost, a light overdrive, or a roaring distortion. Each of the knobs has a massive range, and the tone circuit can be cut out completely via an on-on switch below the tone knob. Even with the simplicity of the pedal, the Hot Tubes can turn any amp into a high-gain monster. I personally use it as a boost and add a little color to my tone with the gain and tone knobs. It can breathe life into any thin-sounding amp or pedal. Try it out!