6550, Tung-Sol Reissue, Matched Vacuum Tube, Apex Matched Pair

Copy of the original type 3 Tung-Sol 6550 made in the 1960s. Triple getter, carbonized screen, and gold plated grid. The current production benchmark of the classic 6550. Made in Saratov, Russia

These tubes are Apex® Matched.

Product Measurements

Capacitance, grid to plate: 0.8 pF
Capacitance, input: 15 pF
Capacitance, output: 10 pF
Heater Voltage: 6.3 V
Heater Current: 1.6 A
Heater Cathode Voltage, Negative: 300 V
Heater Cathode Voltage, Positive: 100 V
Plate Voltage (Ua): 660 V
Grid 2 Voltage, Pentode: 440 V
Grid 2 Voltage, Triode: 500 V
Grid 1 Voltage: -300 V
Plate Dissipation (Wa): 42 W
Grid 2 Dissipation: 6 W
Cathode Current (Ik): 190 mA
Grid Circuit Resistance (Rg), Fixed Bias: 50 kΩ
Grid Circuit Resistance (Rg), Self Bias: 250 kΩ
Bulb Temperature: 250°C