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GMI-90

BEAM-POWER TETRODE

The GMI-90 beam-power tetrode is used in pulse modulators in stationary RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass, with base.
Height: at most 250 mm.
Diameter: at most 145 mm.
Mass: at most 1.3 kg

gmi-90(1)00031.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, MHz 20-80
acceleration, m/s² 39
Multiple impacts with acceleration, m/s² 49
Relative humidity at up to +40 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 25
Heater current, A 6.5-7.8
Peak anode current (at anode voltage 33 kV, bias voltage -0.6 kV, grid 2 voltage 1.75 kV), A, at least 40
Cutoff voltage (at anode voltage 33 kV, grid 2 voltage 1.75 kV, anode current 0.5 mA), V, at most 550
Interelectrode capacitance, pF:
input, at most 150
output, at most 35
transfer, at most 10
Electrical parameters over 350 h of service:
peak anode current, A, at least 36

Limit Operating Values
Heater voltage, V 23.75-26.25
Anode voltage, kV 33
Grid 2 voltage, kV 1.75
Peak grid 1 excess voltage, V 300
Peak anode current, A, at least 36
Dissipation, W:
anode 140
grid 2 45
grid 1 5
Pulse duration, µs 3
Warm up time, s, at least 300
Envelope temperature, °C 170