Tested and selected - Grade A - 100 +
Minimum emission of 100% on both triodes 

The PhilipsECG JAN 12AX7 (USA production, often also Sylvania manufacturing) is a high-quality dual triode preamp tube from the "Joint Army-Navy" (JAN) series and thus meets strict military specifications for durability, reliability, and stability.
It is characterized by a clear, dynamic, and balanced sound. It offers a low-noise signal, excellent amplification, and a very musical harmonic spectrum 



Parameters / Typical Value

• Heater voltage (Uf): 6.3 V (parallel) / 12.6 V (in series)
• Heater current (If): 300 mA (at 6.3 V) / 150 mA (at 12.6 V)
• Anode voltage (Ua): 250 V
• Anode current (Ia) :1.2 mA per system
• Mutual conductance (S): 1.6 mA/V
• Amplification factor (µ): 100
• Internal resistance (Ri): approx. 62.5 kΩ
• Grid leak (max): 0.5 µA
• Maximum Ua limits: 300 V
• Total power consumption: approx. 1 W