The JJ Electronic 7591 is a reliable and accurate reproduction of the classic tube. This 19 Watt pentode has been used in a variety of amplifiers including Hi-Fi amps and Ampegs. The JJ 7591 is a great replacement for any 7591 tube position.

These tubes are Apex® Matched.

Product Measurements

Item Diameter: 33.3 mm
Item Height: 79 mm
Body Height: 93 mm
Filament Voltage (Uf): 6.3 V
Filament Current (If): 0.8 A
Plate Voltage (Ua): ≤ 550 V, 300 V typical
Plate Current (Ia): 60 mA
Grid Voltage 1 (Ug1): -10 V typical
Grid Voltage 2 (Ug2): ≤ 440 V, 300 V typical
Grid Current 2 (Ig2): 8 mA
Transconductance (S): 10 mA/V
Gain (μ): 16.8
Plate Dissipation (Wa): ≤ 19 W
Grid 2 dissipation (Wg2): 3.3 W
Cathode Current (Ik): ≤ 85 mA
Grid Circuit Resistance (Rg), Fixed Bias: 0.3 MΩ
Grid capacitance (cg1): 10 pF
Plate Capacitance (ca): 5 pF
Grid to Plate Capacitance (ca/g): 0.25 pF
Grid Circuit Resistance (Rg), Cathode Bias: 1 MΩ