GKE-100 tube has a direct heated carbide-coated cathode and a wicker molybdenum grid.
According to pre-WWII Soviet standards, GKE-100 means:
G = "generator tube"
K = "shortwave"
E = "has a screen grid"
100 = "100 watts RF power output"
Key specifications:
RF Power Output: 100 Watts
Maximum Plate Dissipation: 80 Watts
Filament Voltage: 11 Volts
Filament Current: 2 Amps.
Plate Voltage: 1500 Volts
Screen Voltage: 250 Volts
Initial Plate Current: 80 mA
Signal Grid Current: 6.5 mA
Transconductance (Gm): 2.5 mA/V
Amplification Factor: 225
Input Capacitance: 15 mmfd
Output Capacitance: 10.5 mmfd
Grid to Plate Capacitance: 0.05 mmfd
Height: 220-20 mm
Diameter: 62-4 mm
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