Germanium refers to a type of semiconductor material commonly used in older guitar effect pedals, particularly in fuzz and distortion pedals. Germanium transistors offer a warmer, more organic sound with a smoother and more responsive breakup compared to their more modern silicon counterparts. This makes them a favourite for achieving vintage-style tones, especially for players seeking classic fuzz or overdrive sounds with a distinctive character.

Pedals like the Electro-Harmonix Big Muff and Fuzz Face (from brands like Dallas Arbiter and Marshall) have been made with germanium transistors, contributing to their iconic tone. Germanium fuzz pedals tend to produce rich harmonic overtones and dynamic response to picking intensity, making them highly sought after by musicians who appreciate a more nuanced and vintage approach to tone shaping. However, they are more temperature-sensitive than silicon transistors, which can lead to changes in tone as environmental conditions shift.