12AU7 is a miniature 9-pin medium-gain dual triode vacuum tube. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A). 12AU7 is also known in Europe under its Mullard-Philips tube designation ECC82.

The tube is popular in hi-fi vacuum tube audio as a low noise line amplifier, driver and phase-inverter in vacuum tube push-pull amplifier circuits. There are opinions which indicate that this popularity is caused by audiophile industry/media polarization, not by its performance. The tube has a center tapped filament so it can be used in either 6.3V 300mA or 12.6V 150mA heater circuits.

Current production of 12AU7 takes place in Russia, Slovakia, Serbia and China.

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