[Index page]   [Vacuum tubes]   [Components]   [Radio-devices]   [Assistance]   [Schematics]   [Software]   [Payment]   [Warranty]
 
 

GI-7B
POWER TRANSMITTING TRIODE


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.

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 10µ 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, 
1/ pulse duty factor 1, 400-150, pulse duration 3-10 µ s) .............................................
 30W

1kW
 

Maximum date

Anode Dissipation ...................................................................................................... 350 W
Grid Dissipation .......................................................................................................... 7 W
Cathode Current ......................................................................................................... 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 ............................................................................... 		200°C
160°C
100°C
200°C
250°C
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/ s² 343
Ambient temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 98

[Back]