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GM-1A

TRIODE

The GM-1 A power modulator triode is used in lowfrequency amplifier circuits with no current in control
grid circuit, in RF equipment.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal.
Cooling: forced (water for anode, air for stem).
Height: at most 440 mm.
Diameter: at most 163 mm.
Mass: at most 5 kg.

gm-1a(1)00051.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C -10 to +55
Relative humidity at up to +25 °C, % 98

BASIC DATA
Electrical Parameters
Filament voltage, V 10.5
Filament current, A 180-210
Mutual conductance (at anode voltage
3kV, anode currents 6 and 10 A), mA/V
22-32
Gain coefficient (at anode voltages 3 and
5 kV, anode current 6 A)
3.4-5
Anode current (at anode voltage 4 kV), A 22-30
Negative grid voltage (at anode voltage 6 kV, anode current 1 A), kV, at most 1.6

Limit Operating Values
Filament voltage, V 10.5
Filament starting current, A 285
Anode voltage, kV 6
Anode dissipation, kW 30

gm-1a(2)00061.jpg
Averaged Anode Characteristic Curves: Uf = 10.5V;
_____ Pa max

gm-1a(2)00062.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 10.5V

gm-1a(2)00063.jpg
Averaged Grid Characteristic Curves: Uf = 10.5V;