2N708

High-speed NPN silicon planar epitaxial small-signal transistor housed in a metal TO-18 can, engineered for very low saturation voltage and high-frequency RF amplification up to VHF bands. Equivalents: 2N708A, BSX19, NTE123A. Real-Life Examples: Vintage shortwave receiver front ends, legacy digital computer clock distribution lines, and early modular telemetry systems.