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The GI-50A triode is used as a wide-band signal amplifier with a peak output power of up to 2 MW at frequencies up to 170 MHz.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic with outer copper anode and ring leads of cathode and grid.
Cooling: forced (water for anode, air for stem and bulb).
Height: at most 420 mm.
Diameter: at most 210 mm.
Mass: at most 18 kg.


Vibration loads:
frequencies, Hz 5-80
acceleration, m/s² 24
Multiple impacts with acceleration, m/s² 118
Ambient temperature, °C -60 to+70
Relative humidity at +40 °C, % 98

Electrical Parameters
Filament voltage (AC or DC), V 13
Filament current, A 480-560
Negative cutoff voltage, absolute value (at anode voltage 10 kV, anode current 0.1 A), V, at most 450
Peak anode current (at anode voltage 3 kV, peak grid voltage 2 kV, negative grid voltage 250 V), A, at least 350
Peak grid current (at anode voltage 3 kV, peak grid voltage 2 kV, negative grid voltage 250 V), A, at most 105
Mutual conductance (at anode voltage 4 kV, anode currents 2.5 and 4.5 A), mA/V 65-85
Gain coefficient (at anode voltages 3 and 4 kV, anode current 4.5 A) 30-44
Cathode heating time, s, at most 15
Peak oscillatory power (at anode voltage 26 kV, pulse duration 1,000 µs, pulse 1/duty factor at least 40, frequency at most 170 MHz), MW, at least 2
Interelectrode capacitance, pF:
output, at most 3.5
transfer 42-52

Limit Operating Values
Filament voltage (AC or DC), V:
maximum 13.7
minimum 12.3
Filament starting current, A 800
Peak anode voltage, kV 32
Dissipation, kW:
anode 40
grid 1
Minimum 1/duty factor 40
Maximum pulse duration, µs 1,000
Operating frequency, MHz 170
Temperature at metal-to-ceramic seals, °C 150

Characteristic Curves Showing Emission Current versus Anode and Grid Voltages

Averaged Characteristic Curves:
Uf = 15V;
_____ anode-grid;
_ _ _ grid

Averaged Characteristic Curves:
Uf = 13V;
_____ anode;
_ _ _ grid-anode