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GMI-32B

TETRODE

The GMI-32B tetrode is used as a pulse power switch in RF equipment

GENERAL
Cathode: indirectly heated, sintered, oxide-coated.
Cooling: forced air
Height with leads: at most 425 mm.
Diameter: at most 126.5 mm.
Mass: at most 4 kg

gmi-32b(1)00101.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-600
acceleration, m/s² 98
Multiple impacts with acceleration, m/s² 392
Ambient temperature, °C -60 to +85
Relative humidity at +35 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 27
Heater current, A 9.3-10.7
Peak anode current (at anode voltage 4 kV, grid 2 voltage 1,75 kV, bias voltage -700 V, peak grid 1 voltage 150 V, reservoir capacitor in anode circuit 5 µF), A, at least 50
Peak grid l.current (at anode voltage 4 kV, grid 2 voltage 1.75 kV, bias voltage -700 V, peak grid 1 voltage 150 V, reservoir capacitor
5 JuF in anode circuit), A, at most 		8
Peak grid 2 current (at anode voltage 4 kV, grid 2 voltage 1.75 kV, bias voltage -700 V, peak grid 1 voltage 150 V, reservoir capacitor 5 µs in anode circuit), A, at most 4
Negative cutoff voltage (at anode voltage 44 kV, grid voltage 1.75 kV, reservoir capacitor 0.25 µF in anode circuit), V, at most 600
Cathode heating time, s, at most 180
Interelectrode capacitance, pF:
input 140-180
output 20-33
transfer,at most 1

Limit Operating Values
Heater voltage (AC or DC), V 24.3-29.7
Anode voltage, kV 40
Grid 2 voltage, kV 2
Maximum bias voltage, absolute value, V -800
Maximum grid 1 excess voltage, V 175
Dissipation, W:
anode 2-103
grid 2 35
grid 1 7
Heater starting current, A, max 20
Peak cathode current at 1/duty factor 200, A 59
Minimum warm up time, s 180
Maximum pulse duration at peak anode current 50 A, µs 10
Minimum 1/duty factor at peak anode current 50 A 200
Temperature at anode, bulb and stem, °C 150

gmi-32b(2)00011.jpg
Averaged Characteristic Curves Showing Grid 1 Cutoff Voltage versus Anode Voltage

gmi-32b(2)00012.jpg
Averaged Peak Characteristic Curves: Ug2 = 1kV

gmi-32b(3)00021.jpg
Averaged Peak Characteristic Curves: Ug2 = 2kV

gmi-32b(3)00022.jpg
Averaged Peak Characteristic Curves: Ug2 = 2,5kV

gmi-32b(3)00023.jpg
Averaged Peak Characteristic Curves: Ug2 = 1kV;
_____ anode;
_ _ _ grid 2-anode

gmi-32b(3)00024.jpg
Averaged Peak Characteristic Curves: Ug2 = 2kV
_____ anode;
_ _ _ anode-grid 2

gmi-32b(3)00025.jpg
Averaged Peak Characteristic Curves: Ug2 = 2.5kV;
_____ anode;
_ _ _ anode-grid 2