6FQ7/6CG7

Medium-Mu Dual Triode Amplifier Tube, featuring an internal shielding barrier between the two triode sections to prevent cross-talk. Operating with a 6.3V heater, it is highly optimized for use as a vertical deflection oscillator, phase inverter, or low-noise audio pre-amplifier in high-fidelity stereo gear and television frames, housed in a standard 9-pin miniature glass envelope (Noval, T-6.5 bulb).