GU53 B
TETRODE
The GU53B tetrode is used as a power amplifier in stationry RF equipment and automobile parking stations, including singlesideband transmitters.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metalceramic.
Cooling: forced air.
Height: at most 472 mm.
Diameter: at most 225 mm.
Mass: at most 33 kg
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +35 
Relative humidity at up to +40 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage, V  14 
Filament current, A  230260 
Mutual conductance (at anode voltage 1.4 kV, grid 2 voltage 1 kV, anode currents 7 and 11 A), mA/V  110140 
Gain coefficient (grid 1 grid 2) (at anode voltage 1.4 kV, grid 2 voltages 1 and 1.2 kV, anode current 7 A)  710 
Anode current at zero grid 1 voltage (at anode voltage 2 kV, grid 2 peak voltage 1.5 kV), A, at least  16 
Inerelectrode capacitance, pF:  
input, at most  470 
output, at most  75 
transfer, at most  5 
Negative cutoff voltage (at anode voltage 10 kV, grid 2 voltage 1.5 kV, anode current 0.5 A), V, at most  350 
Output power (at anode voltage 12 kV), kW, at least  80 
Limit Operating Values  
Filament voltage, V  1314.5 
Anode voltage (DC), kV  12 
Negative grid 1 voltage, kV  1.5 
Grid 2 voltage (DC), kV  1.8 
Filament starting current, A  360 
Dissipation, kW:  
anode:  
at cooling air temperature +30 °C  45 
at cooling air temperature +50 °C  35 
grid 2  1.8 
grid 1  1.0 
Operating frequency, MHz  75 
Anode temperature, °C  250 
Temperature at ceramic parts and seals, °C  200 
Averaged Characteristic Curves:
U_{f} = 14V; U_{g2} = 1.5kV;
_____ anode;
_ _ _ gridanode;
— • — P_{a max}
Averaged Characteristic Curves:
U_{f} = 14V; U_{g2} = 1.75kV;
_____ anode;
_ _ _ gridanode;
— • — P_{a max}
Averaged Characteristic Curves:
U_{f} = 14V; U_{g2} = 2kV;
_____ anode;
_ _ _ gridanode;
— • — P_{a max}
Averaged Characteristic Curves:
U_{f} = 14V; U_{g2} = 1.5kV;
_____ anodegrid;
_ _ _ grid 1;
 .  grid 2
Averaged Characteristic Curves:
U_{f} = 14V; U_{g2} = 1.75kV;
_____ anodegrid;
_ _ _ grid 1;
 .  grid 2
Averaged Characteristic Curves:
U_{f} = 14V; U_{g2} = 2kV;
_____ anodegrid;
_ _ _ grid 1;
 .  grid 2