GU50 PENTODE
The GU50 pentode is used as a RF oscillator and power amplifier in the metric wavelength range in RF equipment
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glass, nobase.
Height: at most 93.5 mm.
Diameter: at most 45.3 mm.
Mass: at most 100 g
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +55 
Relative humidity at up to +25 °C, %  98 
BASIC DATA Electrical Parameters 

Heater voltage, V  12.6 
Heater current, A  0.60.85 
Mutual conductance (at anode voltage 800 V, grid 2 voltage 250 V, grid 1 voltage increment 5 V, anode current 50 mA), mA/V  35.5 
Bias voltage at operating point, V  2555 
Penetration factor of grid 1 relative to grid 2, %  1626 
Interelectrode capacitance, pF:  
input, at most  1315 
output, at most  10.3 
transfer, at most  0.1 
Output power, W, max.:  
at anode voltage 800 V, grid 2 voltage 250 V, grid 1 voltage 100 V, anode current, at most 150 mA  55 
over 1,750 h of service  40 
Limit Operating Values  
Heater voltage, V  11.313.9 
Anode voltage at different wavelengths, V:  
6.5 m or longer  1,000 
6.54.5 m  800 
4.53.5 m  700 
3.52.5 m  600 
Grid 2 voltage, V  250 
Voltage between cathode and heater, V  200 
Dissipation, W:  
anode  40 
grid 2  5 
grid 1  1 
Envelope temperature, °C  200 
Averaged AnodeGrid 2 Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 250V; U_{g3} = 0
Averaged Grid 2Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 250V; U_{g3} = 0
Averaged Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 500V; U_{g3} = 0
_____ anodegrid;
   grid 2