5T8

Medium-Mu Triode and Sharp-Cutoff Pentode Multi-Unit Tube, engineered with a 4.7V heater filament. It is configured primarily for VHF tuner front-ends, where the triode functions as a low-noise localized oscillator and the pentode serves as a high-frequency RF mixer, housed in a standard 9-pin miniature glass envelope (Noval, T-6.5 bulb).