TETRODE
The GU36B1 power tetrode is used for wideband power amplification at frequencies up to 250 MHz in stationary generalpurpose RF equipment.
GENERAL
Cathode: directly heated, carbonized
thoriated tungsten.
Envelope: metalceramic with ring
leads.
Cooling: forced air.
Height: at most 300 mm.
Diameter: at most 184 mm.
Mass: at most 11 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +55 
Relative humidity at up to + 25 °C, %  98 
BASIC DATA
Electrical Parameters 

Filament voltage (AC or DC), V  8.3 
Filament current, A  110130 
Mutual conductance (at anode voltage 2 kV, grid 2 voltage 750 V, anode currents 4 and 6 A), mA/V, at least  7096 
Gain coefficient (at anode voltage 2 kV, grid 2 voltages 750 and 500 V, anode current 4 A)  713 
Anode current (at anode voltage 2 kV, grid 2 voltage 9.000 V), A, at least  5 
Negative cutoff voltage (at anode voltage 7 kV, grid 2 voltage 1.200 V, anode current 0.3 A), absolute value, V, at most  220 
Interelectrode capacitance, pF:  
input, at most  155 
output, at most  24 
transfer, at most  0.8 
Output power (at frequencies up to 250 MHz, anode voltage at least 6 kV, grid 2 voltage 900 V bandwidth 8 MHz), kW, at least  10 
Limit Operating Values  
Filament voltage (AC or DC), V  
at up to 50 MHz  8.3 
at above 50 MHz  8.0 
Filament starting current, A  210 
Anode voltage (DC), kV:  
at up to 100 MHz  8 
at 100250 MHz  7 
Grid 2 voltage (DC), V  1,100 
Negative grid 1 voltage (instantaneous value), absolute value, V  400 
Dissipation, W:  
anode  15x10³ 
grid 1  150 
grid 2  300 
Operating frequency, MHz  250 
Temperature, °C  
anode  250 
stem and ceramictometal seals  175 
Averaged AnodeGrid Characteristic
Curves:
U_{f}
= 8.3V; U_{g2} = 1.2kV
Averaged Grid 1 Characteristic
Curves:
U_{f}
= 8.3V; U_{g2} = 1.2kV
Averaged Grid 2 Characteristic
Curves:
U_{f}
= 8.3V; U_{g2} = 1.2kV
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