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GMI-37A

TRIODE

The GMI-37A triode is used for power switching in pulse modulators in RF equipment

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: metal-ceramic
Cooling: water
Height: at most 785 mm
Diameter: at most 271 mm
Mass: at most 32 kg

gmi-37a(2)00011.jpg
gmi-37a(2)00012.jpg
K1 - cathode; K2 - cathode (connected with pump cathode); C - grid; A - anode; 1 - anode of magnetic electric-discharge pump

OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C -60 to +85
Relative humidity at +40 °C, % 95-98

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 26
Filament current, A 650-790
Peak (excess) grid voltage, kV 2.25
Negative cutoff voltage, absolute value (at anode voltage 55 kV, anode current 25 mA), kV, at most 4.3
Peak anode current (at anode voltage 10 kV, grid voltage -1 kV, filament voltage 26 V, pulse duration 10 µs, pulse frequency 100 Hz, reservoir capacitor 50 µF in anode circuit), A, at least 1,000
Peak grid current (at anode voltage 10 kV, grid voltage -1 kV, pulse duration 10 µs, pulse frequency 100 Hz, reservoir capacitor 50 µF in anode circuit), A, at most 180
Warm up time, s, at most 60
Interelectrode capacitance, pF:
input, at most 450
output, at most 15
transfer, at most 150

Limit Operating Values
Filament voltage (AC or DC), V 24.7-27.3
Maximum filament starting current, A 1,150
Anode voltage, kV 50
Negative grid voltage, absolute value, V 4.3
Peak (excess) grid voltage, kV 2.5
Dissipation, kW:
anode 50
grid 1
Maximum pulse duration, µs 100

gmi-37a(3)00021.jpg
Averaged Characteristic Curves Showing Negative Grid Voltage versus Anode Voltage

gmi-37a(3)00022.jpg
Averaged Characteristic Curves:
Uf = 26V;
_____ Ia;
- - - Ib