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The GI-25 triode is used as an oscillator with pulsed anode and grid keying in the centimetric and decimetric wavelength ranges.

Cathode: indirectly heated, oxide-coated.
Envelope: titanium-ceramic.
Height: at most 37 mm.
Diameter: at most 25.5 mm.
Mass: at most 25 g.

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

Vibration loads:
frequencies, Hz 20-600
acceleration, m/s² 59
Multiple impacts with acceleration, m/s² 490
Single impacts with acceleration, m/s² 2,940
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 6.3
Heater current, A 0.89-1.01
Mutual conductance (at anode voltage 250 V, grid voltage change 1 V, anode current 30 mA), mA/V 18-30
Operating point (negative grid voltage at anode voltage 250 V, anode current 30 mA), V 1.0-4.5
Negative cutoff voltage (at anode voltage 250 V, anode current 200 mA), V, at least 10
Interelectrode capacitance, pF:
input 3.5-5.5
output, at most 0.08
transfer 1.6-2.3
Warm up time, s, at most 45
Peak output power (at pulse 1/duty factor 1,000, pulse duration 1µs, peak anode voltage 2.8 kV, peak anode current 2.5 A, wavelength 7.5 cm), W, at least 900
Peak output power over 1,000 h of service, W, at least 700

Limit Operating Values
Heater voltage, V 6-6.6
Anode voltage, kV:
DC with grid keying 1.3
peak value (with pulse duration at most 3 µs) 3
Peak grid voltage, V -120 to 0
Grid voltage in pulsed grid keying mode, V -80 to 0
Peak anode current (with pulse duration at most 3 µs), A 2.8
Peak grid current, A 0.7
Overshoot of modulating pulse leading edge (with duration at most 0.2 µs), % 20
Dissipation, W:
anode in pulsed operation 12
grid 0.25
Wavelength (with anode modulation), cm, at least 5.5
Pulse 1/duty factor, at least 800
Cathode heating time, s 60
Envelope temperature, °C 200

Averaged Characteristic Curves in Pulsed Operation:
Uf = 6.3V; t = 1µs; pulse frequency 1,000 imp/s;
_____ anode;
_ _ _ grid-anode

Averaged Characteristic Curves in Pulsed Operation:
Uf = 6.3V; t = 1µs; pulse frequency 1,000 imp/s;
_____ anode-grid;
_ _ _ grid