JJ Electronic 12AX7 / ECC83

The JJ Electronic 12AX7 / ECC83 has quickly become a modern classic in preamp tubes. Its rugged design and rich harmonics make this tube an obvious choice for musicians who need a reliable and high quality tube at a reasonable price.

The balanced tone of the JJ 12AX7 works well in any amp. This versatile tube sounds excellent in clean amps offering an amazing dynamic response while also proving itself in high gain amps with its low noise and noticeably less microphonic issues than other tubes. The warm highs and transparent lows make it a great choice for any position in a tube amp. The JJ 12AX7 is the go-to tube of many amp builders and touring musicians.

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): ≤ 8 mA
Filament Current (If): 300 / 150 mA
Filament Voltage (Uf): 6.3 / 12.6 V
Gain (μ): 100
Grid Circuit Resistance (Rg): 2.2 MΩ
Grid Voltage (Ug): ≥ -50 V, -2 V typical
Heater to cathode resistance (Rk/f): 150 kΩ
Heater to cathode voltage (Uk/f): ≤ 180 V
Internal Resistance (Ri): 62.5 kΩ
Item Diameter: 22 mm
Item Height: 56.3 mm
Plate Current (Ia): 1.2 mA
Plate Dissipation (Wa): ≤ 1 W
Plate Voltage (Ua): ≤ 300 V, 250 V typical
Transconductance (S): 1.6 mA/V