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GU-44A

TETRODE

The GU-44A tetrode is used as a RF power in amplifier short-wave transmitters

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: glass-to-metal
Cooling: forced (water for anode, air for envelope,
stem and seals).
Height: at most 506 mm.
Diameter: at most 182 mm.
Mass: almost 13kg

gu-44a(1)1.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 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
Negative grid 1 voltage, kV 1.5
Grid 2 voltage (DC), kV 2
Filament starting current, A 300
Dissipation, kW:
anode 50
grid 2 3.2
grid 1 1.2
Operating frequency (at output power 70kW), MHz 32
Temperature at envelope, stem and seals, °C 150

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

gu-44a(2)2.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 2kV;
_____ anode;
_ _ _ grid 2-anode;
x Pa max (GU-44A);
. Pa max (GU-44B)

gu-44a(2)3.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 1.5kV;
_____ anode-grid;
. grid 1;
_ _ _ grid 2

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