The JJ Electronic 5751 is a dual triode that can be used in place of most 12AX7 circuits. The rugged build of this tube and reduced gain (30% less than a 12AX7) can improve headroom and give better control in high gain stages allowing users to more easily dial in sweet spots. The JJ 5751 features a smooth and balanced tone and a detailed response with low noise and low microphonics.

For a Performance Tested or Matched version of this tube, see T-5751-JJ-GX.

Product Measurements

Item Diameter: 22 mm
Item Height: 56.3 mm
Body Height: 49.2 mm
Filament Voltage (Uf): 6.3 / 12.6 V
Filament Current (If): 350 / 175 mA
Plate Voltage (Ua): ≤ 300 V, 100 V typical
Plate Current (Ia): 0.8 mA
Grid Voltage (Ug): ≥ -50 V, -1 V typical
Transconductance (S): 1.2 mA/V
Gain (μ): 70
Internal Resistance (Ri): 58 kΩ
Plate Dissipation (Wa): ≤ 1 W
Grid capacitance (cg1): 1.6 pF
Plate Capacitance (ca): 0.33 pF
Grid to Plate Capacitance (ca/g): 1.7 pF