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GI-7B
(GI-70B)

MICROWAVE TRIODE

The GI-7BT (GI-70BT) triode is used for continuouswave or pulsed operation with anode modulation, as an oscillator and an amplifier.

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

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic with ring leads of cathode, heater and grid.
Cooling: forced air.
Height: at most 110.5 mm with heat sink, 97 mm with no heat sink.
Diameter: at most 65 mm with heat sink, 47 mm with no heat sink.
Mass: at most 330 g with heat sink, 170 g with no heat sink.

gi-7b(gi-70b)(3)00091.jpg
gi-7b(gi-70b)(3)00092.jpg
KP - cathode and heater; P - heater; C - grid; A - anode

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 5-1,000
acceleration, m/s² 98
Multiple impacts with acceleration, m/s² 735
Ambient temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 12.6
Heater current, A 1.8-2.05
Mutual conductance (at anode voltage 1.3 kV, grid voltage change 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 10-12.5
output 4.2-5
transfer 0.055-0.95
Warm up time, s, at most 90
Output power:
in CW operation (at heater voltage 11.6V, anode voltage 1.05 kV, anode current 300 mA, wavelength 18.5 cm), W, at least 40
in pulsed operation (at heater voltage 12.6 V, peak anode voltage 9 kV, peak anode current 7.5 A, wavelength 10 cm), kW, at least 12
Output power over 650 h of service (at heater voltage 11.6V, anode voltage 1.05 kV, anode current 300 mA, wavelength 18.5 cm), W, at least 32

Limit Operating Values
Heater voltage, V 12-13.2
Anode voltage, kV:
pulsed operation 9
instantaneous value in CW operation 5
DC voltage in continuous operation 2.5
DC voltage with cold cathode 3
Grid voltage, V:
pulsed operation -900 to +600
CW operation, instantaneous value -400 to +80
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, min. 1.5
Pulse duration, µs 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-7b(gi-70b)(4)00021.jpg
Averaged Anode-Grid Characteristic Curves in Pulsed
Operation:
Uf= 12.6V

gi-7b(gi-70b)(4)00022.jpg
Averaged Characteristic Curves Showing Oscillator
Output Power versus Anode Voltage in ContinuousWave Generation:
Uf=12.6V;A= 18.5cm