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GU-44B

TETRODE

The GU-44B tetrode is used for RF power amplification in short-wave transmitters

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: glass-to-metal
Cooling: forced air
Height: at most 506 mm
Diameter: at most 225 mm
Mass: at most 33 kg

gu-44b(1)1.jpg

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

BASIC DATA
Electrical Parameters
Filament voltage, V 12.6
Filament current, A 170-200
Mutual conductance (at anode voltage 1.5 kV, grid 2 voltage 1 kV, anode currents 8 and 12A), mA/V 55-75
Gain coefficient (grid 1 -grid 2) (at anode voltage 1.5 kV, grid 2 voltages 1 and 1.4 kV, anode current 8 A) 4.2-6.2
Interelectrode capacitance, pF:
input, at most 300
output, at most 55
transfer, at most 4
Negative cutoff voltage (at anode voltage 10 kV, grid 2 voltage 2 kV, anode current 0.5 A), V, at most 700

Limit Operating Values
Filament voltage, V 12-13
Anode voltage (DC), kV 12
Grid 1 voltage (negative), kV 1.5
Grid 2 voltage (DC), kV 2
Filament starting current, A 300
Dissipation, kW:
anode 30
grid 2 3.2
grid 1 1.2
Operating frequency (at output power 70 kW), MHz 32
Anode temperature, °C 250
Temperature at envelope, stem and seals, °C 150

gu-44b(2)1.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 1.5kV;
_____ anode;
_ _ _ grid 2-anode;
Pa max

gu-44b(2)2.jpg
Averaged Characteristic Curves:
Ua = 12.6V; Ug2 = 2kV;
_____ anode;
_ _ _ grid 2-anode;
Pa max

gu-44b(2)3.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 1.5kV;
_____ anode-grid;
. grid1;
_ _ _ grid 2

gu-44b(2)4.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 2kV;
_____ anode-grid;
. grid1;
_ _ _ grid 2