GI-7B
POWER TRANSMITTING TRIODE


The GI-7B 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.

GENERAL
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.

Principal date
by Uf = 12.6V; Ua = 1.3 kV; Ua imp = 9kV; Ia = 150 mA; Ia imp = 7.5A; Wavelength, cm 9; Pulse duration 10 s; 1/ pulse duty factor 1, 400

Cathode current at the beginning of characteristic (by Ug = -40V; Ua = 1.5 kV) ................................................................ <= 5 mA
Grid current (returning) by Ua = 1.5 kV .................................................................................................................................... 96 mA
Cathode current (emission imp.) by Ua = Ug = 400 V ................................................. ......................................................... >= 20 A
Current of leakage (grid-cathode) by Ug = -200 V ................................................................................................................. 40 - 80 uA
Transconductance ...................................................................................................................................................................... 23 + 3 ma/V
Grid voltage (operating point) ................................................................................................................................................... -10 + 2.5 V
Capacitance:
    Input ..........................................................................................................................................................................................
    Output ......................................................................................................................................................................................
    Feed-through ..........................................................................................................................................................................

11 pF
4.6 pF
0.075 pF
Output power: 
 In CW operation (at anode voltage 1.05 kV, anode current 300mA,wavelength 18.5cm)..............................................
 In pulsed operation (at peak anode voltage 9 kV, anode current 7.5 A, wavelength 10 cm)..........................................
30W
1kW
Maximum date
Anode Dissipation.................................................................................................................................................................... 350 W
Grid Dissipation........................................................................................................................................................................ 7 W
Cathode Curre........................................................................................................................................................................... 0.6 A
Cathode Peak Current (class B).............................................................................................................................................. 1.25 A
Heater Voltage............................................................................................................................................................................ 12 - 13.2 V
Heater Current............................................................................................................................................................................ 1.925 A
Anode Voltage............................................................................................................................................................................ 2.5 kV
Anode Voltage by Cold Cathode............................................................................................................................................. 3 kV
Temperature:  anode end face ................................................................................................................................................
                         anode heat sink ................................................................................................................................................
                         cathode lead .....................................................................................................................................................
                         grid lead ............................................................................................................................................................
                         outer ceramic parts ..........................................................................................................................................
200C
160C
100C
200C
250C
Operating Position ...................................................................................................... ............................................................. Any
Blower ......................................................................................................................................................................................... 24 m3/h

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 5-600
acceleration, m/ s 2 59
Multiple impacts with acceleration, m/ s 343
Ambient temperature, C -60 to +100
Relative humidity at up to +40 C, % 98
 

 

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