5670

Miniature 9-pin medium-mu twin triode utilizing a specialized pinout, designed to function as a reliable wideband amplifier or local oscillator in military and commercial avionics equipment. Equivalents: 2C51, 396A, 5670W, 6385, 6N3P. Real-Life Examples: Vintage aviation radio transceivers, early commercial computing instruments, high-end custom audio line stages.