JJ Electronics 12AT7/ECC81 Vacuum Preamp Tube T-12AT7-JJ

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.

Product Measurements by Type
Amplification Factor 50
Capacitance, each triode 1.6 pF
Capacitance, input 2.5 pF
Capacitance, output 0.4 pF
Cathode to Heater Voltage < 200 V
Grid Circuit Resistance (Rg), Automatic Bias, Each Triode 1.0 MΩ
Grid Circuit Resistance (Rg), Fixed Bias, Each Triode 0.25 MΩ
Grid Reverse Current 0.5 μA
Grid Reverse Current Max 55 mA
Heater Current 330 - 360 mA
Heater Voltage 6 V / 12 V
Plate Current (Ia) < 18 mA
Plate Dissipation, per triode (Wa) 3.25 W
Plate Voltage (Ua) < 330 V
Transconductance (S)