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The GI-27AM triode is used in self-excited oscillator and power amplifier circuits with pulsed anode modulation in RF equipment.

Cathode: directly heated.
Envelope: metal-ceramic.
Cooling: forced (water for anode, air for other elements of envelope).
Height: at most 345 mm.
Diameter: at most 171 mm.
Mass: at most 11 kg.

K1, K2 - cathode; C - grid; A - anode

Multiple impacts with acceleration, m/s² 147
Ambient temperature, °C 1-55
Relative humidity at up to +25 °C without moisture condensation, % 80

Electrical Parameters
Filament voltage, V 13
Filament current, A 470-550
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.1 A), absolute value, V, at most 385
Peak cathode emission current (at peak anode and grid voltages 3 kV, with interconnected anode and grid), A, at least 500

Gain coefficient (at anode voltages 4 and 5 kV, anode current 4.5 A) 26-46
Peak power output (at peak anode voltage 40 kV, pulse duration 300µs, at up to 150 MHz), MW, at least 5
Mutual conductance (at anode voltage 5 kV, anode currents 2.5 and 4.5 A), mA/V 75-110
Interelectrode capacitance, pF:
input, at most 200
output, at most 50
transfer, at most 4

Limit Operating Values
Filament voltage, V 13.5
Peak anode voltage (DC), kV 40
Negative grid voltage, absolute value, V 4,800
Anode dissipation, kW 25
Filament starting current (peak value), A 1,100
Grid dissipation, W 250
Pulse duration, µs 500
Operating frequency, MHz, at most 200
Temperature at the hottest point of envelope, °C 175

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