This is a new development in the world of distortion. To our knowledge, this type of technology has never been used in a distortion pedal before. The technology itself isn't new, in fact, its usage in the audio world was long ago retired. The application though is revolutionary for achieving guitar overdrive/distortion. At the heart of the Screamer Fuzz Selenium, lives a vintage Selenium rectifier. Cusack Music owner Jon Cusack sourced these parts while working on a repair for a vintage amplifier. He purchased the rest of the inventory from the supplier - 26 pieces. The rectifiers are estimated to be 60+ years old. Jon kept these in his personal vault for over 20 years, until he found the right project for them: The Screamer Fuzz Selenium. The Screamer Fuzz Selenium combines the groundbreaking Selenium rectifier overdrive circuit with the LED fuzz circuit of our Screamer Fuzz V3. The layout and signal path is the same as the Screamer Fuzz V3, but that's where the similarities end. The Selenium overdrive's sound is in a league of its own. At low levels, it fattens up the signal adding warm tube-like compression yet, it doesn't limit your dynamics. It sounds and feels more like a parallel compressor with a low mid-range eq shift. As the drive gets turned up the magic of the selenium transforms from a tonal secret weapon to a zippery, smooth, fat overdrive. Blending in the LED fuzz circuit produces a very satisfying, distinct, 3-dimensional sounding fuzz. We haven't heard anything quite like it.