GI-7BT
(GI-70BT)

MICROWAVE 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.

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

OPERATING ENVIRONMENTAL CONDITIONS
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

BASIC DATA 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 µs),kW, at least	11
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, 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

Averaged Anode Characteristic Curves:
U_f = 12.6V

Averaged Anode-Grid Characteristic Curves:
U_f = 12.6V

Averaged Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in ContinuousWave Generation:
L = 18.5cm

Averaged Anode Characteristic Curves

Averaged Characteristic Curves:
U_f = 12.6V;
_____ anode;
_ _ _ grid-anode;
— • — P_{a max}

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

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