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GMI-19B

TETRODE

The GMI-19B tetrode is used as a pulse power switch in pulse modulators in RF equipment

gmi-19b(1)00041.jpg

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: glass-to-metal
Cooling: forced air
Working position: upright, allowable tilt at most 45 deg
Height: at most 270 mm
Diameter: at most 152 mm
Mass: at most 5 kg

OPERATING EVIRONMENTAL CONDITIONS

Vibration loads:
frequencies, Hz 5-80
acceleration, λο/s2 25
Multiple impacts with acceleration, m/s² 118
Ambient temperature, °C -60 to +100
Relative humidity at +40 °C, % 95-98

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 9.5
Filament current, A 170-210
Anode voltage (DC), kV 4
Grid 2 voltage (DC), kV 2.5
Grid 1 voltage (DC), kV -1
Peak grid 1 voltage, V 600
Peak anode current, A, at least 120
Peak grid 2 current, A, at most 25
Peak grid 1 current, A, at most 12
Negative grid 1 cutoff voltage (at anode voltage 36 kV), V,at most 900
Warm up time, s, at most 10
Pulse duration, µs 25
Interelectrode capacitance, pF:
input 150-210
output 22-34
transfer, at most 5

Limit Operating Values
Filament voltage (AC or DC), V 9-10
Filament starting current, A 285
Anode voltage, kV 30
Grid 2 voltage (DC), kV 2.5
Grid 1 voltage (DC), kV -1.2
Peak grid 1 voltage, V 600
Peak grid 1 voltage at power supply source, V 800
Dissipation, W:
anode 1-103
grid 2 125
grid 1 25
Peak cathode current, A 165
Maximum pulse duration, µs 1,000
Envelope temperature, °C 150
Minimum heating time, s 15
Maximum reservoir capacitor in anode circuit, µF 1.25

gmi-19b(3)00061.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 400V

gmi-19b(3)00062.jpg
Averaged Peak Grid 2-Anode Characteristic
Curves:
Uf = 9.5V; Ug2 = 400V

gmi-19b(3)00063.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 1kV

gmi-19b(3)00064.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 2.5kV

gmi-19b(4)00071.jpg
Averaged Peak Grid 2-Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 1kV

gmi-19b(4)00072.jpg
Averaged Peak Grid 2-Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 2.5kV

gmi-19b(4)00073.jpg
Averaged Peak Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 400V

gmi-19b(4)00074.jpg
Averaged Characteristic Curves Showing Grid 1 Cutoff Voltage versus Anode Voltage:
Uf = 9.5V; Ug1 is cutoff voltage

gmi-19b(4)00075.jpg
Averaged Peak Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 1kV

gmi-19b(4)00076.jpg
Averaged Peak Anode Characteristic Curves:
Uf = 9.5V; Ug2 = 2.5kV