GK71
PENTODE
The GK71 pentode is used for generation and power amplification in stationary RF equipment.
GENERAL
Cathode: carbonized thoriated tungsten.
Envelope: glass, with base.
Height: at most 195 mm.
Diameter: at most 68 mm.
Mass: at most 320 g.
Limit Operating Values  
Filament voltage, V  1822 
Anode voltage, kV  1.5 
Grid 2 voltage, V  400 
Dissipation, W:  
anode  125 
grid 2  25 
Frequency, MHz  20 
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +55 
Relative humidity at up to +25 °C, %  98 
Vibration loads:  
frequency, Hz  1622 
acceleration, m/s²  49 
BASIC DATA Electrical Parameters 

Filament voltage, V  20 
Filament current, A  2.73.5 
Mutual conductance (at anode voltage 600 V, grid 2 voltage 400 V, grid 3 voltage 50 V, anode currents 150 and 200 mA), mA/V  3.14.9 
Gain coefficient (grid 1 grid 2) (at anode voltage 750 V, grid 2 voltages 300 and 400 V, grid 3 voltage 50 V, anode current 130 mA)  46 
Interelectrode capacitance, pF:  
input  1422 
output  1024 
transfer,at most  0.15 
Output power (at 5200 MHz, anode voltage 1.5 kV, arid 2 voltage 40Q V, firid 1 voltage 100 V, grid 3 voltage 50 V), W, at least  200 
Averaged Anode Characteristic Curves:
U_{f} = 20V; U_{g2} = 0.3kV; U_{g3} = 50V
Averaged Anode Characteristics:
U_{f} = 20 V; U_{g2} = 0.4 kV; U_{g3} = 50 V;
— • — P_{a max}
Averaged GridAnode Characteristic Curves:
U_{f} = 20V; U_{g2} = 0.4kV; U_{g3} = 50V
Averaged Characteristic Curves:
U_{f} = 20V; U_{g2} = 1.5kV; U_{g3} = 50V
_____ anodegrid;
    grid 2
Averaged AnodeGrid 2 Characteristic Curves:
U_{f} = 20V; U_{g2} = 0.3kV; U_{g3} = 50V
Averaged Grid Characteristic Curves:
U_{f} = 20V; U_{g2} = 1.5kV; U_{g3} = 50V
Averaged Grid 2 Anode Characteristic Curves:
U_{f} = 20V; U_{g2} = 0.4kV; U_{g3} = 50V
Averaged Characteristic Curves:
U_{f}  20V; U_{g2} = 0.3kV: U_{g3}  50V;
_____ anodegrid;
_ _ _ grid 2
Averaged Characteristic Curves:
U_{f} = 20V; U_{g2} = 0.4kV; U_{g3} = 50V;
_____ anodegrid;
_ _ _ grid 2