6AD7G

Triode-Power Pentode Multi-Unit Tube, combining an independent triode element with a high-gain power pentode section inside a single glass envelope. Operating from a 6.3V heater, the triode functions as an audio voltage pre-amplifier while the power pentode section delivers speaker-level acoustic amplification or vertical sweep drive parameters, housed in a standard large 8-pin Octal-style base glass envelope.