GU5B
TRIODE
The GU5B triode is used as a power amplifier tube at frequencies up to 110 MHz in RF equipment and RF heating generators.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstoceramic.
Cooling: forced air.
Height: at most 210 mm.
Diameter: at most 100 mm.
Mass: at most 2.5 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to 55 
Relative humidity at up to +25 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage, V  12.6 
Filament current, A  2027 
Mutual conductance (at anode voltage 3 kV. anode currents 0.4 and 0.7 A), mA/V  1218 
Gain coefficient iat anode voltages 2 and 4 kV and anode current 0.5 A)  6085 
Anode current at zero grid voltage (at anode voltage 4 kV), A  0.450.75 
Interelectrode capacitance. pF  
input, at most  19 
output, at most  0.5 
transfer, at most  16 
Output power (at wavelength 12cm) kW, at least  3.5 
Limit Operating Conditions  
Filament voltage, V  126 
Anode voltage, kV:  
at operating frequencies up to 30 MHz  5 
at operating frequencies 30110 MHz  4 
Anode dissipation, kW  2.5 
Operating frequency, MHz  110 
Temperature at envelope, stem and seals, °C  150 
Averaged Filament Characteristic Curve Resistance of Filamentary Cathode R_{c}: 0.06 Om
Averaged AnodeGrid Characteristic Curves:
U_{f} = 12.6V
Averaged Anode Characteristic Curves:
U_{f} = 12.6V;
_ _ _ P_{a max}
Averaged GridAnode Characteristic Curves:
U_{f} = 12.6V