12AU7

Medium-Mu Dual Triode Amplifier Tube, featuring a 12.6V center-tapped heater configuration. Operating as a highly versatile, general-purpose dual-section voltage amplifier, it serves as a foundational industry standard for pre-amplifier stages, tone control circuits, and phase inverters in high-fidelity stereo gear and guitar amplifiers, housed in a standard 9-pin miniature glass envelope (Noval, T-6.5 bulb).