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GMI-5

TETRODE

The GMI-5 tetrode is used as a pulse power switch in pulse modulators in RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated
Envelope: glass
Cooling: natural or forced air
Height: at most 130 mm
Diameter: at most 67 mm
Mass: at most 300 g

gmi-5(2)00041.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 5-200
acceleration, m/s² 59
Multiple impacts with acceleration, m/s² 118
Single impacts with acceleration, m/s² 245
Linear loads with acceleration, m/s² 245
Relative humidity at +40 °C, %, at most 98

BASIC DATA
Electrical Parameters
Heater voltage, V 26
Heater current, A 1.6-1.9
Peak anode current (at anode voltage 20 kV, grid 1 voltage -800 V, grid 2 voltage 1.25 kV, peak grid 1 excess voltage 250 V, pulse duration 2 µs, pulse frequency 500 pulses/s), A, at least 16
Grid 2 average current (at anode voltage 20 kV, grid 1 voltage -800 V, peak grid 1 excess voltage 250 V, pulse duration 2 µs, pulse frequency 500 pulses/s), mA 0.5-5
Average grid 1 current (at anode voltage 20 kV, grid 1 voltage -800 V, excess voltage 250 V, pulse duration 2 µs, pulse frequency 500 pulses/s), mA 0.5-3
Negative cutoff voltage (at anode voltage 20 kV, grid 2 voltage 1.25 kV, anode current 0.2 mA), absolute value, V, at most 800
Interelectrode capacitance, pF:
input 40-75
output 4-13
transfer, at most 0.5
Pulse duration, µs 2
Pulse frequency, pulses/s 500
Warm up time, s, at most 180
Peak anode current over 300 h of service, A, at least 13

Limit Operating Values
Heater voltage, V 23.5-28.5
Anode voltage, kV 20
Grid 2 voltage, kV 1.25
Negative grid 1 voltage, absolute value, kV 1
Peak cathode current, A 27
Dissipation, W:
anode 50
grid 2 6
grid 1 3
Pulse duration, µs 5
Temperature at bulb and glass-to-metal seals, °C 200

gmi-5(3)00051.jpg
Averaged Peak Characteristic Curves:
Uf = 26V; Ug2 = 0.75kV;
_____ anode;
_ _ _ grid 2-anode

gmi-5(3)00052.jpg
Averaged Peak Characteristic Curves:
Uf = 26V; Ug2 = 1kV;
_____ anode;
_ _ _ grid 2-anode

gmi-5(4)00061.jpg
Averaged Peak Characteristic Curves:
Uf = 26V; Ug2 = 1.25kV:
_____ anode;
_ _ _ grid 2-anode

gmi-5(4)00062.jpg
Averaged Peak Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 0.75kV

gmi-5(4)00063.jpg
Averaged Peak Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 1kV

gmi-5(4)00064.jpg
Averaged Peak Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 1.25kV