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GMI-32B-1

TETRODE

The GMI-32B-1 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 360 mm.
Diameter: at most 126.5 mm.
Mass: at most 2.7 kg

gmi-32b-1(1)00031.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 2.75 kV, bias voltage -850 V, peak grid 1 voltage 270 V, reservoir capacitor 5 µF in anode circuit), A, at least 100
Peak grid 1 current (at anode voltage 4 kV, grid 2 voltage 2.75 kV, bias voltage -850 V, peak grid 1 voltage 270 V, reservoir capacitor 5 µF in anode circuit), A, at most 15
Peak grid 2 current (at anode voltage 4 kV, grid 2 voltage 2.75 kV, bias voltage -850 V, peak grid 1 voltage 270 V, reservoir capacitor 5 µF in anode circuit), A, at most 9
Negative cutoff voltage (at anode voltage 44 kV, grid 2 voltage 2.75 kV, reservoir capacitor 0.25 µ in anode circuit), at most 750
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 2.75
Bias voltage, absolute value, V -850
Grid 1 excess voltage, V 270
Dissipation, W:
anode 2x10³
grid 2 35
grid 1 7
Heater starting current, A, at most 20
Peak cathode current at 1/duty factor 200, A 59
Minimum warm up time, s 180
Maximum pulse duration at peak anode current 100A, µs 10
Minimum 1/duty factor at peak anode current 100 A 500
Temperature at anode, bulb and stem, °C 150

gmi-32b-1(2)00041.jpg
Averaged Characteristic Curves Showing Grid 1 Cutoff Voltage versus Anode Voltage

gmi-32b-1(2)00042.jpg
Averaged Peak Characteristic Curves:
Ug2 = 1kV

gmi-32b-1(3)00051.jpg
Averaged Peak Characteristic Curves:
Ug2 = 2kV

gmi-32b-1(3)00052.jpg
Averaged Peak Characteristic Curves:
Ug2 = 2.5kV

gmi-32b-1(3)00053.jpg
Averaged Peak Characteristic Curves:
Ug2 = 1kV;
_____ anode;
_ _ _ anode-grid 2

gmi-32b-1(3)00054.jpg
Averaged Peak Characteristic Curves:
Ug2 = 2kV;
_____ anode;
_ _ _ anode-grid 2

gmi-32b-1(3)00055.jpg
Averaged Peak Characteristic Curves:
Ug2 = 2.5kV;
_____ anode;
_ _ _ anode-grid 2