7581A, Tung-Sol Reissue, Matched Vacuum Tube, Matched Quad

Rated for more power than the standard 7581 (35W plate dissipation vs 30W plate dissipation).

Product Measurements

Item Height: 4.25 in.
Body Height: 3.688 in.
Item Diameter: 1.562 in.
Capacitance, grid to plate: 0.6 pF
Capacitance, input: 10 pF
Capacitance, output: 6.5 pF
Heater Voltage: 6.3 V
Heater Current: 900 mA
Heater to cathode voltage (Uk/f): 200 V
Plate Voltage, pentode (Ua): ≤ 500 V, 70 V typical
Plate Voltage, triode (Ua): ≤ 450 V, 250 V typical
Screen Voltage, pentode: ≤ 450 V, 300 V typical
Plate Dissipation (Wa): 35 W
Screen Dissipation: 5 W
Grid Circuit Resistance (Rg), Fixed Bias: 0.1 MΩ
Grid Circuit Resistance (Rg), Cathode Bias: 0.5 MΩ
Transconductance (S): 6,000 μmhos
Plate Current, pentode (Ia): 210 mA
Plate Current, triode (Ia): 72 mA
Screen Current, pentode: 25 mA
Screen Current, triode: 5 mA
Grid 1 Voltage: -14 V
Plate Resistance (Ra): 22.5 KΩ