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A piece of germanium
Germanium transistors

Germanium is a chemical element. Its chemical symbol is Ge. Its atomic number is 32. It was discovered by Clemens Winkler. It is a shiny, hard, silver-white metalloid. The chemistry of Germanium is quite like tin. Germanium forms many organometallic compounds. It is an important semiconductor material used in transistors. Many of the earliest transistors were based on germanium. Most later ones were based on silicon. The sound of germanium-based amplifiers and effect pedals is associated with 1960s-era rock music. Germanium-based guitar pedals are still made and are often used for their classic sound.