Per Valvewizard other stuff page. He has several uses for LED. #2 on the cathode he states it replaces the resistor and capacitor and it acts as a perfect bypass capacitor. I wonder if anyone can explain what he means? I have a Blue 470nm LED on V1b cathode of my 2204 without any resistor or capacitor and it does sound really good to me. Clean tones with plenty of bass, dirty (full preamp on) also sounds rather nice with good control from the guitar volume and tone pots. 2.74Vdc on the cathode is 500mVdc higher than the spec'd voltage from Mark Huss schematic Has anyone here tried this mod? What do you think of it? Why does it work so well? I would like to understand it from an electrical perspective. I have played with this in all three modes of the 3-way cold clipper switch and have not found a downside. Why isn't this a standard on some tube amps already?