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GM-4B

TETRODE

The GM-4B tetrode is used in high-voltage regulators

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: glass-to-metal.
Anode cooling: forced air.
Height: at most 287 mm.
Diameter: at most 144 mm.
Mass: at most 6 kg

gm-4b(1)00091.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 10-120
acceleration, m/s² 59
Ambient temperature, °C -65 to +85
Relative humidity at up to +40 °C, % 95-98

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 5
Filament current, A 35-43
Resistance of unheated cathode, Om, at most 0.012
Negative grid 1 voltage (at anode current 0.8 A, anode voltage 1.5 kV), V 22-40
Grid 2 voltage, kV 1
Cathode emission current (at peak anode and grid voltage 300 V), A, at least 8
Grid 2 current (at anode voltage 1.5 kV, anode current 1 A), mA, at most 75
Inverse grid 1 current (at anode voltage 9 kV, anode current 1 A), µA, at most 100
Mutual conductance (at anode voltage 1.5 kV, anode currents 0.8 and 1 A), mA/V 19-27
Gain coefficient (grid 1 -grid 2) (at anode voltage 1.5 kV, grid 2 voltages 1 and 1.2 kV, anode current 1 A) 10-15
Interelectrode capacitance, pF:
input, at most 85
output, at most 16.5
transfer, at most 0.5

Limit Operating Values
Filament voltage (AC or DC), V 4.5-5.25
Filament starting current, A 60
Anode voltage, kV 9
Anode voltage over 0.1 s at overload up to 30 kW, kV 20
Grid 2 voltage, kV 1.2
Dissipation, W:
anode 9x10³
grid 2 80
grid 1 50
Warm up time, s 20
Temperature, °C:
anode 250
glass and glass-to-metal seals 150

gm-4b(2)00011.jpg
Averaged Characteristic Curves: Uf = 5V; Ug2 = 800V;
_____ anode;
_ _ _ grid-anode;
Pa max

gm-4b(2)00012.jpg
Averaged Characteristic Curves: Uf = 5V; Ug2 = 1kV;
_____ anode;
_ _ _ grid-anode;
Pa max

gm-4b(3)00021.jpg
Averaged Characteristic Curves:
Uf = 5V; Ug = 1,2kV;
_____ anode;
_ _ _ grid-anode;
Pa max

gm-4b(3)00022.jpg
Averaged Characteristic Curves:
Uf = 5V; Ug2 = 800V;
_____ anode-grid;
- - - grid 1;
_ . _ grid 2

gm-4b(3)00023.jpg
Averaged Characteristic Curves:
Uf = 5V; Ug2 = 1.2kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2

gm-4b(3)00024.jpg
Averaged Characteristic Curves:
Uf = 5V; Ug2 = 1.2 kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2