The JJ Electronic 12AU7 / ECC82 is a medium gain dual triode built with the quality and reliability that we’ve come to expect from a JJ tube. This 12AU7 offers smooth tones and clear definition which is why it’s no surprise that this tube is often found in hifi equipment as well as guitar amplifiers.

For a Performance Tested or Matched version of this tube, see T-12AU7-JJ-GX.

Product Measurements

Item Diameter: 22.2 mm
Item Height: 56.3 mm
Body Height: 49.2 mm
Filament Voltage (Uf): 6.3 / 12.6 V
Filament Current (If): 300 / 150 mA
Plate Voltage (Ua): ≤ 300 V, 250 V typical
Plate Current (Ia): 10.5 mA
Grid Voltage (Ug): ≥ -50 V, -8.5 V typical
Transconductance (S): 2.2 mA/V
Gain (μ): 17
Internal Resistance (Ri): 7.7 kΩ
Plate Dissipation (Wa): ≤ 2.75 W
Cathode Current (Ik): ≤ 20 mA
Heater to cathode voltage (Uk/f): ≤ 180 V
Heater to cathode resistance (Rk/f): 150 kΩ