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GMI-14B

TETRODE

The GMI-14B tetrode is used as a pulse power switch in RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 235 mm.
Diameter: at most 148 mm.
Mass: at most 2.8 kg

gmi-14b(1)00101.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-200
acceleration, m/s² 98
Multiple impact with acceleration, m/s² 392
Ambient temperature, °C -60 to +250
Relative humidity at +35 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 26
Heater current, A 1.5-1.7
Peak anode current (at anode voltage 3.5 kV, grid 2 voltage 2.15 kV, grid 1 bias voltage -0.9 kV, peak grid 1 excess voltage 350 V), A, at least 130
Peak grid 2 current (at anode voltage 3.5 kV, grid 2 voltage 2.15 kV, grid 1 bias voltage -0.9kV, peak grid 1 excess voltage 350 V), A, at most 15
Peak grid 1 current (at anode voltage 3.5 kV, grid 2 voltage 2.15 kV, grid 1 bias voltage - 0,9 kV, peak grid 1 excess voltage 350 V), A, at most 22
Grid 1 inverse current, µA, at most 350
Negative cutoff voltage (at anode voltage 36 kV, grid 2 voltage 2 kV, anode current 1.5 mA), absolute value, kV, at most 1
Interelectrode capacitance, pF:
input, at most 220
output, at most 35
transfer, at most 2

Limit Operating Values
Heater voltage (AC or DC), V 23.5-28.5
Anode voltage (DC), kV 36
Grid 2 voltage, kV 2.15
Grid 1 bias voltage, kV -1
Grid 1 excess voltage, V 350
Dissipation, W:
anode 600
grid 2 35
grid 1 6
Peak cathode current, A 165
Maximum pulse duration, µs 10
Minimum warm up time, s 240
Minimum pulse 1/duty factor 1,000
Bulb temperature, °C 120

gmi-14b(2)00011.jpg
Averaged Peak Grid 2 Characteristic Curves: Uf = 26V; Ug2 = 2.1kV;
_____ anode;
_ _ _ grid 2-anode

gmi-14b(2)00012.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 26V; Ug2 = 2.1kV