GI-7 B/GI-70 BT (similar AEG LDa)

Microwave Tetrode

         The GI-7B (GI-70B) microwave triode operates as an oscillator and an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges.

The triode is available in two variants differing in the type of cooling: the GI-7B with a heat sink for forced air cooling and the GI-70B with no heat sink for other systems of cooling.


Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced air.
Height: 110.5 mm with heat sink, 97 mm with no heat sink.
Diameter: 65 mm with heat sink.

Mass: at most 330 g with heat sink, 170 g with no heat sink.

gi-7 b

gi-7 b -

KP - cathode and heater; P - heater; C - grid; A - anode


Vibration loads:

frequencies, Hz 5-600
acceleration, m/s2 59
Multiple impacts with acceleration, m/s2   343
Ambient temperature, C -60 to +100
Relative humidity at up to +40 C, % 98

Electrical Parameters
Heater voltage, V 12.6
Heater current, A 1.8-2.05
Mutual conductance (at anode voltage 1.2 kV, grid voltage change by 1 V, anode current 150 mA), mA/V 20-26
Penetration factor (at anode voltage 1.3 kV, anode voltage change 200 V, anode current 150mA), % 1.2-1.8
Operating point (negative grid voltage at anode voltage 1.3 kV, anode current 150 mA), V 12.5-7.5

Interelectrode capacitance, pF;

input 10-12.2
output 0.055-0.095
transfer 4-5.2
Warm up time (at anode voltage 400 V), s, at most 90

Output power:

in CW operation (at anode voltage 1.05 kV, anode current 300 mA, wavelength 18.5 cm), W, at least 30
in pulsed operation (at peak anode voltage
9 kV, anode current 7.5 A, wavelength 10 cm, 1/pulse duty factor 1,400-150, pulse duration 3-10 s),kW, at least
Output power over 650 h of service, W, at least 24

Limit Operating Values
Heater voltage, V 12-13.2

Anode voltage, kV:

in pulsed operation 9
instantaneous value in CW operation 5
DC in continuous operation 2.5
DC with cold cathode 3

Grid voltage, V:

instantaneous value in continuous operation -400 to +80
in pulsed operation -900 to +600

Cathode current, A:

r.m.s. value 0.6
DC component under conditions of class without modulation 0.4
instantaneous value under conditions of class without modulation 1.25
Anode current (DC component in pulsed operation), A 7.5

Dissipation, W:

anode 350
grid 7
Wavelength, cm 9
Cathode heating time, s 90
Pulse duration, s 10

Temperature, C:

anode end face 200
anode heat sink 160
cathode lead 100
grid lead 200
outer ceramic parts 250
Resistance in grid circuit, kOm 10

gi-7 b

Averaged Anode Characteristic Curves:
Uf = 12.6V

gi-7 b

Averaged Anode-Grid Characteristic Curves:
Uf = 12.6V

gi-7 b

ContinuousWave Generation:
L = 18.5cm

gi-7 b

Averaged Anode Characteristic Curves

gi-7 b

Averaged Characteristic Curves:
Uf = 12.6V;
_____ anode;
_ _ _ grid-anode;
-  - Pa max

gi-7 b

Averaged Pulse-Operation Characteristic Curves:
Uf = 12.6V; t = 4s; frequency 350 imp/s;
_____ anode;
_ _ _ grid-anode

gi-7 b

Averaged Characteristic Curves:
Uf = 12.6V;
_____ anode-grid;
_ _ _ grid

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