Electro-Harmonix 12AU7 (ECC82) (Preamp Vacuum Tube)

Medium-Mu twin triode for use in preamplifier and driver circuits.
The 12AU7 is a miniature medium-mu twin triode intended for service in radio and TV receivers or in audio amplifiers. The tube is suitable for use in a variety of stages, such as general-purpose amplifier, phase inverter, oscillator, or multivibrator.

The 12AU7 tube type is equivalent to the ECC82 tube