GMI-2B

TETRODE

The GMI-2B tetrode is used in modulators with partial discharge of reservoir capacitor

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass, with base.
Anode cooling: forced air.
Working position: upright.
Height: at most 300 mm.
Diameter: at most 210 mm.
Mass: at most 5.5 kg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz	10-80
acceleration, m/s²	34
Ambient temperature, °C	-55 to +70
Relative humidity at +40 °C, %	95-98

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	25
Heater current, A	15.8-19.2
Anode voltage (DC), kV	32
Grid 2 voltage (DC), kV	2
Grid 1 voltage (DC), kV	600x10-3
Peak grid 1 excess voltage, kV	200x10-3
Peak anode current, A, at least	90
Anode current (average value), mA, at least	140
Grid 1 current (average value), mA, at least	1
Grid 2 current (average value), mA, at least	30
Negative cutoff voltage (at anode current 1 mA), V, at most	570
Anode load resistance, Om	300
Reservoir capacitor in anode circuit, µF	0.05
Pulse duration, µs	0.65-1.1
Pulse 1/duty factor	570-615
Interelectrode capacitance, pF:
input, at most	350
output, at most	125
transfer, at most	10

Limit Operating Values
Heater voltage (AC or DC), V	23.7-26.3
Minimum grid 1 voltage (DC), V	-600
Dissipation, W:
anode	900
grid 2	80
grid 1	12
Peak anode current, A	110
Pulse duration, µs	0.3-2
Temperature of anode face, °C	120

Averaged Characteristic Curves (at peak grid 1 excess voltage U_{g1 imp} = 100V):
_____ anode;
_ . _ grid 1-anode

Averaged Characteristic Curves (at peak grid 1 excess voltage U_{g1 imp} = 125V):
_____ anode;
_ _ _ grid 1-anode

Averaged Characteristic Curves (at peak grid 1 excess voltage U_{g1 imp} = 150V):
_____ anode;
_ _ _ grid 1 -anode

Averaged Grid 2-Anode Characteristic Curves (at peak grid 1 excess voltage U_{g1 imp} = 100 V)

Averaged Grid 2-Anode Characteristic Curves (at peak grid 1 excess voltage U_{g1 imp} = 125 V)

Averaged Grid 2-Anode Characteristic Curves (at peak arid 1 excess voltage U_{g1 imp} = 150 V)