JJ Electronic 12AT7 / ECC81

The JJ Electronic 12AT7 / ECC81 is a good choice for phase inverters, reverb drivers, and general preamp use. This tube offers low noise, low microphonics, and warm smooth tones at a great price. Like all JJ tubes, it has a rugged construction that doesn’t compromise the sound of your amp. The JJ 12AT7 is a solid replacement for any 12AT7, ECC81, or 6201 tube. It can also be used to replace 12AX7 tubes in position 1 to reduce gain.

This tube is Apex® Matched and Performance Tested.

• Precision Matching: For even greater accuracy, select for the Matched option, where both sides of dual triodes are transconductance matched.
• Enhanced Phase Inverter Performance: Ideal for phase inverters and balanced amplification applications, matched preamp tubes can provide symmetrical output, reduce distortion and improve clarity.
• Performance Tested: All Matched preamp tubes undergo the same rigorous testing as our standard Performance Tested tubes, ensuring consistent quality and performance.

Product Measurements

Body Height: 49.2 mm
Cathode Current (Ik): ≤ 15 mA
Filament Current (If): 300 / 150 mA
Filament Voltage (Uf): 6.3 / 12.6 V
Gain (μ): 60
Grid Circuit Resistance (Rg): 1 MΩ
Grid Voltage (Ug): ≥ -50 V, -2 V typical
Heater to cathode voltage (Uk/f): ≤ 90 V
Internal Resistance (Ri): 11 kΩ
Item Diameter: 22 mm
Item Height: 56.3 mm
Plate Current (Ia): 10 mA
Plate Dissipation (Wa): ≤ 2.5 W
Plate Voltage (Ua): ≤ 300 V, 250 V typical
Transconductance (S): 5.5 mA/V