GU84 B
TETRODE
The GU84B tetrode is used for power amplification in travelingwave and singlesideband signal amplifier circuits and as power amplifiers in RF equipment.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: metal ceramic.
Cooling: forced air.
Height: at most 112 mm.
Diameter: at most 99 mm.
Mass: at most 1.3 kg.
K  cathode; P 
heater; C1  grid 1; C2  grid 2; A  anode
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  180 
acceleration, m/s²  49 
Multiple impacts with acceleration, m/s²  147 
Ambient temperature, °C  10 to +70 
Relative humidity at up to +35 °C, %  98 
BASIC DATA
Electrical Parameters 

Heater voltage, V  27 
Heater current, A  3.44.0 
Negative bias voltage (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2,000 mA), absolute value, V  1050 
Grid 1 cutoff voltage (at anode voltage 2,000 V, grid 2 voltage 375 V, anode current 20 mA, anode resistance 0.5 kOm), absolute value, V, at most  150 
Zero anode current (at anode voltage 250 V, grid 2 voltage 375 V, grid 1 voltage 0), A  3.56 
Grid 1 reverse current (at anode voltage 1,000 V, grid 2 voltage 375 V, anode current 2,000 mA), µA, at most  80 
Grid 2 current (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2,000 mA), mA  25 to+60 
Mutual conductance (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2,000 mA), mA/V  4472 
Output power under conditions of class AB_{1} at frequencies 0.11 MHz (at anode voltage 2,000 V, grid 2 voltage 375 V, grid 2 current at least 80 mA absolute value), kW, at least  1.5 
Output power under conditions of class ¶ at frequency 250 MHz (at anode voltage 2,000 V, grid 2 voltage 375 V, anode current 1,500 mA, grid 2 current at least 60 mA, grid 1 current at most 4 mA), kW, at most  1.2 
Interelectrode capacitance, pF:  
input  90115 
output  1823 
transfer,at most  0.2 
Limit Operating Values  
Heater voltage (AC or DC), V  25.628.4 
Anode voltage, kV:  
DC  2.2 
instantaneous value  4.25 
Grid 2 voltage (DC) V  400 
Negative grid 1 voltage (DC), absolute value, V  150 
Input voltage (amplitude value), V  150 
Cathodeheater voltage (either polarity, absolute value), V  100 
Cathode current, A:  
DC component  2 
instantaneous value  6 
Averaged GridAnode Characteristic
Curves:
U_{f}
= 27V; U_{g2} = 400V
Averaged Anode Characteristic Curves:
U_{f}
= 27V; U_{g2} = 400V
Averaged AnodeGrid and Grid Characteristic
Curves:
U_{f}
= 27 V; U_{g2} = 400 V;
_____ I_{a};
   I_{g2}
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