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.

roduct Measurements by Type 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