2N929

High-gain, low-noise NPN silicon planar small-signal transistor housed in a metal TO-18 can, specifically optimized for precision low-level audio amplifiers, input stages, and high-impedance instrumentation. Equivalents: 2N929A, BC108, BC548 (plastic TO-92 version), NTE123A. Real-Life Examples: Vintage studio microphone preamplifiers, high-end classic analog mixing consoles, laboratory-grade testing instruments, and precision monitoring gear.