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The GM-3P triode is used in low-frequency no-distortion cathode-coupled amplifier circuits in stationary RF equipment.


Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal.
Cooling: forced (evaporation for anode, air for stem and envelope).
Height: at most 250 mm.
Diameter: at most 146 mm.
Mass: at most 8 kg.

Ambient temperature, °C -10 to +55
Relative humidity at up to +25 °C, % 80

Electrical Parameters
Filament voltage, V 6.3
Filament current, A 140-160
Mutual conductance (at anode voltage 2 kV, anode currents 2 and 3 A), mA/V 17-27
Gain coefficient (at anode voltages 2 and 3 kV, anode current 2 A) 7-11
Anode current at zero grid voltage, A:
at anode voltage 1.5 kV 2.4-3.6
at peak anode voltage 3 kV 6-10
Cutoff voltage (at anode voltage 4.5 kV, anode current 0.5 A), kV, at most 0.6
Interelectrode capacitance, pF:
input, at most 40
output, at most 6
transfer, at most 40

Limit Operating Values
Filament voltage, V 6-6.6
Anode voltage (DC), kV 6
Nagative grid voltage, absolute value, kV 1.5
Filament starting current, A 225
Dissipation, W:
anode 1x104
grid 300
Temperature at stem and seals, °C 150

Averaged Anode Characteristic Curves:
Uf = 6.3V;
__ __ Pa max

Averaged Characteristic Curves:
Uf = 6.3V;
_____ anode-grid;
_ . _ grid