GMI-7-1

TETRODE

The GMI-7-1 tetrode is used as a pulse power switch in pulse modulators in stationary and mobile equipment

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass, no-base, with ring leads of cathode and heater.
Cooling: natural or forced air.
Height: at most 190 mm.
Diameter: at most 120 mm.
Mass: at most 0.8 kg

1, 3 - grid 2; 2, 4 - grid 1; 5 - heater; KP - cathode and heater; A - anode

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	26
Heater current, A	5.6-6.4
Anode voltage (DC), kV	2.75
Grid 2 voltage (DC), kV	2
Negative grid 1 cutoff voltage, absolute value, V, at most	900
Peak anode current, A:
at heater voltage 26 V, at least	52
at heater voltage 23.5 V, at least	42
Peak grid 1 current, A, at most	9
Peak grid 2 current, A, at most	10
Warm up time, s, at least	240
Pulse duration, µs, at most	25
Pulse frequency, pulses/s	200
Interelectrode capacitance, pF:
input, at most	120
output, at most	18
transfer, at most	0.9

Limit Operating Values
Heater voltage (AC or DC), V	23.5-28.5
Anode voltage (DC), kV	22
Grid 2 voltage (DC), kV	2
Grid 1 voltage (DC), kV	-1
Peak grid 1 excess voltage, V	350
Dissipation, W:
anode	125
grid 2	20
grid 1	3.2
Peak cathode current, A	85
Pulse duration, µs	5
Temperature at bulb, and glass-to-metal seals, °C	200

Averaged Peak Characteristic Curves:
U_f = 26V; U_g2 = 2000V;
_____ anode;
_ _ _ grid-anode

Averaged Peak Characteristic Curves:
U_f = 26V; U_g2 = 1800V;
_____ anode;
_ _ _ grid-anode

Averaged Peak Characteristic Curves:
U_f = 26V; U_g2 = 1600V;
_____ anode;
_ _ _ grid-anode

Averaged Peak Grid-Anode Characteristic Curves:
U_f = 26V; U_g2 = 2000V

Averaged Peak Grid-Anode Characteristic Curves:
U_f = 26V; U_g2 = 1800V

Averaged Peak Grid-Anode Characteristic Curves:
U_f = 26V; U_g2 = 1600V