2N721

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General-purpose PNP silicon planar small-signal transistor housed in a metal TO-18 can, built to act as the complementary pair to the 2N718 in balanced push-pull configurations. Eq uivalents: 2N721A, BC177, NTE159. Real-Life Examples: Mid-century analog instrumentation amplifiers, vintage audio preamplifier drivers, and early commercial testing hardware. Show more