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GM-3A

TRIODE

The GM-3A triode is used in low-frequency no-distortion cathode-coupled amplifier circuits in electronic equipment.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal.
Cooling: forced (water for anode, air for stem).
Height: at most 240 mm.
Diameter: at most 100 mm.
Mass: at most 2 kg.

gm-3a(1)00091.jpg

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

BASIC DATA
Electrical Parameters
Filament voltage, V 6.3
Filament current, A 140-160
Mutual conductance, mA/V 17-27
Gain coefficient 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), V, at most 600
Interelectrode capacitance, pF:
input, at most 36
output, at most 6
transfer, at most 36

Limit Operating Values
Filament voltage, V 6-6.6
Anode voltage, kV 6
Dissipation, W:
anode 7.5x10³
grid 300
Temperature at envelope, stem and seals, °C 150

gm-3a(2)00011.jpg
Averaged Anode Characteristic Curves:
Uf = 6.3V;
Pa max

gm-3a(2)00012.jpg
Averaged Characteristic Curves:
Uf = 6.3V;
_____ anode-grid;
_ . _ grid