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The GI-39B triode generates and amplifies RF oscillations in pulsed operation with anode modulation.

Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic with ring leads of cathode, heater and grid.
Cooling: forced air.
Height: at most 147 mm.
Diameter: at most 100.2 mm.
Mass: at most 1.2 kg.


Vibration loads:
frequencies, Hz 2-2,000
acceleration, m/s² 4.9-98
Multiple impacts with acceleration, m/s² 343
Linear loads with acceleration, m/s² 294
Ambient temperature, °C -60 to+150
Relative humidity at up to +40 °C, % 95-98

Electrical Parameters
Heater voltage (AC or DC), V 12.6
Heater current, A 3.4-3.9
Anode voltage (DC), kV 2
Mutual conductance, mA/V 27-36
Penetration factor (at anode voltage change 0.2 kV, anode current 0.25 A), % 0.6-1
Warm up time, s, at most 90
Oscillatory power in pulse generation mode (at peak anode voltage 20 kV, peak anode current 16 A, wavelength about 30 cm, 1/duty factor 500, pulse duration 2-5 µs), kW, at least 128
Interelectrode capacitance, pF:
input 21-25
transfer 4.2-6.3

Limit Operating Values
Heater voltage (AC or DC), V 13.2-12
Peak anode voltage, kV 20
Negative peak grid 1 voltage, kV 1
Dissipation, W:
anode (average value) 440
grid 5
Peak anode current, A 16
Peak grid current, A 7
Minimum wavelength, cm 25
Minimum 1/duty factor 500
Pulse duration, µs:
maximum 10
minimum 1
Temperature, °C:
anode lead 200
cathode lead 150
grid lead 180
anode insulator 250

Standard Operating Conditions
Heater voltage, V 12.6
Peak anode voltage, kV 20
Peak anode current, A 16
Wavelength, cm 30
Peak oscillatory power, kW 128
Pulse duration, µs 2-4
1/duty factor 500

Averaged Peak Characteristic Curves:
Uf = 12.6V; t = 2µs; frequency 1,000 imp/s;
_____ anode;
_ _ _ grid-anode

Averaged Peak Characteristic Curves Showing Oscillator Output Power versus Anode Current:
Uf = 12.6V; Ua imp = 20kV; t = 2 µs; frequency 1,000 imp/s

Averaged Peak Characteristic Curves:
Uf = 12.6V; t = 2µs; frequency 1,000 imp/s;
_____ anode-grid;
_ _ _ grid

Characteristic Curves Showing Flow Rate of Envelope Cooling Air versus Anode Dissipation:
_____ at 100°C;
_ _ _ at 160°C