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The GI-15B (GI-150) microwave triode is used 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-15B with a heat sink for forced air cooling and the GI-150 with no heat sink for other systems of cooling.

Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced air.
Height: at most 88.5 mm with heat sink, 78.8 mm with no heat sink.
Diameter: at most 45 mm with heat sink, 26.3 mm with no heat sink.
Mass: at most 120 g with heat sink, 60 g with no heat sink.

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

Vibration loads:
frequencies, Hz 5-2,000
acceleration, m/s² 98
Multiple impacts with acceleration, m/s² 735
Single impacts with acceleration, m/s² 1,470
Linear loads with acceleration, m/s² 490
Ambient temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 98

Electrical Parameters
Heater voltage, V 12.6
Heater current, A 0.75-0.88
Mutual conductance (at anode voltage 400 V, grid voltage change ±0.5 V, anode current 15mA), mA/V 8-12
Penetration factor (at anode voltage 400 V, anode voltage change 400 V, anode current 15 mA), % 0.7-1.5
Operating point (negative grid voltage at anode voltage 400 V, anode current 15 mA), V 4-2
Interelectrode capacitance, pF:
input 9.5-11.5
output, at most 0.04
transfer 2-3
Warm up time, s, at most 60
Output power, W:
in CW operation, at least 3
in pulsed operation, at least 100
Output power over 200 h of service, W 2.4

Limit Operating Values
Heater voltage, V 12-13.4
Anode voltage, kV:
DC in pulsed operation (with pulse duration at most 5 µs) 4
DC with cold cathode 1
DC 0.8
Grid voltage, V:
instantaneous value (with pulse duration below 1 µs) -150 to +100
instantaneous value (with pulse duration at most 5 µs) -150 to +80
Cathode current, A:
r.m.s. value 0.15
in pulsed operation (with pulse duration at most 5 µs) 3.5
Dissipation, W:
with forced cooling 80
with no forced cooling 20
grid 2
Wavelength (in pulsed operation), cm 7
Cathode heating time, s, at least 45
Temperature, °C:
anode,at least 200
leads of grid and cathode 120
cathode lead (after operation for not over 10 min) 140
Resistance in grid circuit, kOm 10

Averaged Anode-Grid Characteristic Curves:
Uf= 12.6V

Averaged Characteristic Curves in Pulsed Operation:
Uf = 12.6V; t = 2µs; pulse frequency 500 Hz
_____ anode-grid curves;
- - - grid curves

Characteristic Curves Showing Output Power versus Peak Anode Current:
Uf = 12.6V; t = 2µs; pulse frequency 500 Hz

Averaged Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in ContinuousWave Operation:
Uf = 12.6V