STC NavigatoR / Modular Pulse Tubes / Tube gmi-42b

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GMI-42B

TRIODE

The GMI-42B triode is used for pulse power switching in pulse modulators in RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-caramic.
Cooling: forced air.
Height: at most 135 mm.
Diameter: at most 92 mm.
Mass: at most 1.2 kg

gmi-42b(1)00051.jpg
A -anode; KP - cathode and heater; 1 -grid; 2 - heater; I - contact surfaces

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz	5-1000
acceleration, m/s²	73.5
Multiple impacts with acceleration, m/s²	343
Single impacts with acceleration, m/s²	1470
Ambient temperature, °C	-60 to +100
Relative humidity at +40 °C, %	98

BASIC DATA
Electrical Parameters

Heater voltage (AC or DC), V 26

Heater current, A 3.2-3.6

Anode voltage (DC), kV 2.5

Negative grid voltage, absolute value, V 200

Peak excess grid voltage, kV 1.3

Peak anode current, A 30

Interelectrode capacitance, pF:

input, at most 130

output, at most 25

transfer, at most 2

Limit Operating Values

Heater voltage (AC or DC), V 24.2-27.8

Anode voltage (DC), kV 30

Negative grid voltage, absolute value, V 600

Peak excess grid voltage, kV 1.4

Dissipation, W:

anode 500

grid 25

Peak cathode current, A:

with 1/duty factor 500 33

with 1/duty factor 33 9

Maximum pulse duration at peak cathode current at most 33 A, µs 50

Minimum warm up time, min:

at anode current 30 A 3

at anode current 8 A and anode voltage up to 20 kV 2.5

with speed-up heater voltage and anode voltage 25 kV 2

Envelope temperature, °C 150

gmi-42b(2)00061.jpg
Averaged Peak Characteristic Curves:
U_f = 26V; U_g = -200V;
_____ anode;
_ _ _ grid-anode

gmi-42b(2)00062.jpg
Averaged Peak Characteristic Curves:
U_f = 26V; U_g = -200V
_____ anode;
_ _ _ grid-anode

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	26
Heater current, A	3.2-3.6
Anode voltage (DC), kV	2.5
Negative grid voltage, absolute value, V	200
Peak excess grid voltage, kV	1.3
Peak anode current, A	30
Interelectrode capacitance, pF:
input, at most	130
output, at most	25
transfer, at most	2

Limit Operating Values
Heater voltage (AC or DC), V	24.2-27.8
Anode voltage (DC), kV	30
Negative grid voltage, absolute value, V	600
Peak excess grid voltage, kV	1.4
Dissipation, W:
anode	500
grid	25
Peak cathode current, A:
with 1/duty factor 500	33
with 1/duty factor 33	9
Maximum pulse duration at peak cathode current at most 33 A, µs	50
Minimum warm up time, min:
at anode current 30 A	3
at anode current 8 A and anode voltage up to 20 kV	2.5
with speed-up heater voltage and anode voltage 25 kV	2
Envelope temperature, °C	150