new old stock

New old stock, often abbreviated NOS, describes vintage components such as transistors, diodes, and tubes that are old but unused, and that builders install in pedals and other effects¹²³. In fuzz and overdrive circuits, NOS transistors are reported to shape gain and character, for example lowering gain for a warmer, woolier, more versatile sound¹⁴, or producing a perceptible midrange bump with increased top-end headroom⁵. NOS germanium diodes are used to achieve a classic sound with tighter low end, richer mids, and smoother highs⁶, or a lighter, more open-sounding overdrive⁷. Builders also pair NOS parts with careful matching to individual units for optimum tone and performance⁸.