2N317A

Historic PNP germanium alloy-junction switching and amplification power transistor housed in a specialized metal thread stud-mount package, engineered by Delco/Motorola for heavy current load handling. Equivalents: 2N317, 2N1100, NTE121. Real-Life Examples: Vintage mid-century automotive multi-band radio power amplifiers, early mobile 12V DC power inverter assemblies, and legacy linear power regulators.