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GU-84 B

TETRODE

The GU-84B tetrode is used for power amplification in traveling-wave and singlesideband signal amplifier circuits and as power amplifiers in RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal ceramic.
Cooling: forced air.
Height: at most 112 mm.
Diameter: at most 99 mm.
Mass: at most 1.3 kg.

gu-84b(1)00091.jpg
gu-84b(1)00092.jpg
K - cathode; P - heater; C1 - grid 1; C2 - grid 2; A - anode

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-80
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 3.4-4.0
Negative bias voltage (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2,000 mA), absolute value, V 10-50
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 3.5-6
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 44-72
Output power under conditions of class AB1 at frequencies 0.1-1 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 90-115
output 18-23
transfer,at most 0.2

Limit Operating Values
Heater voltage (AC or DC), V 25.6-28.4
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
Cathode-heater voltage (either polarity, absolute value), V 100
Cathode current, A:
DC component 2
instantaneous value 6

gu-84b(3)00011.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 27V; Ug2 = 400V

gu-84b(3)00012.jpg
Averaged Anode Characteristic Curves:
Uf = 27V; Ug2 = 400V

gu-84b(3)00013.jpg
Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 27 V; Ug2 = 400 V;
_____ Ia;
- - - Ig2