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GMI-6-1

DOUBLE BEAM-POWER TETRODE

The GMI-6-1 double beam-power tetrode is used for switching pulse power up to 14 kW in pulse modulators in RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass.
Height: at most 93 mm.
Diameter: at most 48 mm.
Mass: at most 70 g

gmi-6-1(1)00011.jpg
1, 7 - heater; 2 - grid 1 of second tetrode; 3 - grid 2; 4 - cathode and beam-forming plates; 5 - heater (centre tap); 6 - grid 1 of first tetrode; A1 - anode of first tetrode - top lead; A2 - anode of second tetrode - top lead

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 50-600
acceleration at short-time effects (not over 15 min), m/s² 98
frequencies, Hz 600-2,500
acceleration, m/s² 118
Multiple impacts with acceleration, m/s² 343
Single impacts with acceleration, m/s² 980
Linear loads with acceleration, m/s² 343
Ambient temperature (lower limit), °C -60
Relative humidity at +40 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 12.6
Heater current, A 1.1-1.3
Peak anode current, A 8-10.5
Peak grid 2 current, A, at most 3.5
Peak grid 1 current, A, at most 3
Negative cutoff voltage, V 70-12
Interelectrode capacitance, pF:
input 11-18
output 4.2-6.2
transfer, at most 0.2

Limit Operating Values
Heater voltage, V:
with parallel connection 5.7-7
with series connection 11.4-14
Anode voltage, kV:
with anode voltage switched on 15 s after application of heater voltage 3
with anode voltage switched on not earlier than 50 s after application of heater voltage 4
Negative grid 1 voltage, V 200
Grid 2 voltage, V 800
Peak grid 1 excess voltage, V 150
Peak cathode current (both tetrodes), A 15
Dissipation, W:
anode (both tetrodes) 15
grid 2 (both tetrodes) 3
grid 1 (both tetrodes) 1
Pulse duration, µs 10
Envelope temperature, °C 260

gmi-6-1(2)00021.jpg
Characteristic Curves Showing Cutoff Voltage versus Anode and Grid 2 Voltages: Uf = 12.6; Ug2 = 0.2mA

gmi-6-1(2)00022.jpg
Averaged Peak Grid 1-Anocfe Characteristic Curves:
Uf = 12.6V; Ug2 = 500V

gmi-6-1(3)00031.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 600V

gmi-6-1(3)00032.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 700V

gmi-6-1(3)00033.jpg
Averaged Peak Grid 1-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 800V

gmi-6-1(3)00034.jpg
Averaged Peak Characteristic Curves:
Uf = 12.6V; Ug2 = 500V;
_____ anode;
_ _ _ grid 2-anode

gmi-6-1(3)00035.jpg
Averaged Peak Characteristic Curves:
Uf = 12.6V; Ug2 = 600V;
_____ anode;
- - - grid 2-anode

gmi-6-1(3)00036.jpg
Averaged Peak Characteristic Curves:
Uf = 12.6V; Ug2 = 700V;
_____ anode;
_ _ _ grid 2-anode

gmi-6-1(3)00037.jpg
Averaged Peak Characteristic Curves:
Uf = 12.6V; Ug2 = 800V;
_____ anode;
_ _ _ grid 2-anode