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The GI-31 triode is used as a RF oscillator for pulsed operation with anode keying in the decimetric wavelength range.

Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Height: at most 35 mm.
Diameter: at most 25.8 mm.
Mass: almost 18g.

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

Vibration loads:
frequencies, Hz 1-600
acceleration, m/s² 98
Multiple impacts with acceleration, m/s² 392
Single impacts with acceleration, m/s² 4,900
Linear loads with acceleration, m/s² 980
Ambient temperature, °C -60 to +100
Relative humidity at up to +35 °C, % 98

Electrical Parameters
Heater voltage (AC or DC), V 6.3
Heater current, A 0.9-1
Inverse grid current, µA, at most 2
Mutual conductance (at anode voltage 350 V, anode current 35 mA), mA/V, at least 15
Peak cathode emission current (at peak anode and grid voltages 200 V, pulse duration 4-6 µs), A, at least 15
Peak power output (at peak anode voltages 2.5 kV, peak anode current 2.1 A, pulse duration 3 µs), 1/duty factor 500, wavelength 14-14.5 cm) kW at least 1.5
Interelectrode capacitance, pF:
input 3.5
outut,at most 0.04
transfer 2-2.7

Limit Operating Values
Heater voltage, V 6-6.6
Peak anode voltage, kV 2.8
Dissipation, W:
anode 12
grid 0.5
Peak anode current, A 2.5
Peak grid current, A 1.3
Envelope temperature, °C 200
Warm up time, s 15
Operating frequency, MHz 2,100
Maximum pulse duration, µs, at most 3
Minimum 1/duty factor, at least 400

Standard Operating Conditions
(Anode Keying)
Heater voltage, V 6.3
Peak anode voltage, kV 2.5
Peak anode current, A 2.1
Pulse duration, µs 0.6-3
1/duty factor 500
Wavelength, cm, at least 14
Peak power output, W 1,500

Averaged Characteristic Curves in Pulsed Operation:
Uf = 6.3V; t = 1µs; frequency 2,000 imp/s

Averaged Anode-Grid Characteristic Curves in Pulsed Operation:
Uf = 6.3V; t = 1µs; frequency 2,000 imp/s

Averaged Characteristic Curves Showing Peak Oscillator Output Power versus Anode Voltage:
Uf = 6.3V

Averaged Characteristic Curves of Efficiency versus Anode Voltage:
Uf = 6.3V