GU76 B
TETRODE
The GU76B power tetrode is used for RF signal amplification, including singlesideband signals, in stationary and mobile equipment not operating in motion.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal ceramic, with outer copper anode.
Cooling: forced air.
Height: at most 341 mm.
Diameter: at most 224 mm.
Mass: at most 20 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  11 
Filament current, A  150190 
Mutual conductance (at anode voltage 2 RV, grid 2 voltage 1.3 kV, anode currents Sand 11 A), mA/V  85115 
Gain coefficient (at anode voltage 2 kV, grid 2 voltages 1 and 1.3 kV, anode current 8 A)  69 
Anode current (at anode voltage 2 kV, grid 2 voltage 1.3 kV), A, at least  14.5 
Negative bias voltage (at anode voltage 10 kV, grid 2 voltage 1.3 kV, anode current 2 A), absolute value  170200 
Negative cutoff voltage (at anode voltage 10 kV, grid 2 voltage 1.3 kV, anode current 0.3 A), absolute value, at most  270 
Interelectrode capacitance, pF:  
input  350385 
output  3545 
transfer, at most  2.2 
Output power (at filament voltage 11 V, anode voltage 10 kV, grid 2 voltage 1.3 kV, grid 1 voltage 250 V), kW, at least  40 
Output power (corresponding to the current of singlesideband signal envelope at filament voltage 11 V, anode voltage 10 kV, grid 2 voltage 1.3 kV), kW, at least  30 
Relative level of combination components (at output power at least 30 kW, filament voltage 11 V, anode voltage 10 kV, grid 2 voltage 1.3 kV, anode quiescent current 2A),dB:  
thirdorder components, at most  39 
fifthorder components, at most  40 
Limit Operating Values  
Filament voltage (AC or DC), V  10.511.5 
Filament starting current, A  280 
Anode voltage (DC), kV  11 
Grid 2 voltage (DC), kV  1.5 
Negative grid 1 voltage (instantaneous value), absolute value, V  700 
Dissipation, W:  
anode  3x10³ 
grid 2  900 
grid 1  300 
Operating frequency, MHz  75 
Anode temperature, °C  250 
Temperature at hottest point of envelope, °C  200 
Averaged Characteristic Curves:
U_{f} = 11V; U_{g2} = 1.5kV;
_____ anode:
_ _ _ P_{a max}
Averaged GridAnode Characteristic Curves:
U_{f} = 11V; U_{g2} = 1.5kV;
_____ grid 2;
_ _ _ grid 1
Averaged AnodeGrid Characteristic Curves:
U_{f} = 11V; U_{g2} = 1.5kV
Averaged Characteristic Curves:
U_{f} = 11V; U_{g2} = 1.5kV;
_____ grid 2;
_ _ _ grid 1