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GU-47A

TETRODE

The GU-47A tetrode is used as a power amplifier at frequencies up to 70 MHz

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: glass-to-metal with ring leads of cathode and grids
Cooling: forced (water for anode, air for stem).
Height: at most 260 mm.
Diameter: at most 91 mm.
Mass: at most 2 kg

gu-47a(1)1.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 10-80
acceleration, m/s² 39
Multiple impacts with acceleration, m/s² 118
Ambient temperature, °C -60 to +70
Relative humidity at +40 °C, % 95-98

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 6.3
Filament current, A 57-67
Resistance of unheated cathode, Om, at most 0.01
Grid 2 voltage, kV 0.9
Negative grid 1 voltage (at anode voltage 1 kV, anode current 2.5 A), V 15-27
Anode current at zero grid 1 voltage (at anode voltage 1 kV, grid 2 voltage 1 kV), A, at least 3.2
Anode current (at anode voltage 5 kV, grid 1 voltage -110 V), A, at most 0.55
Mutual conductance (at anode voltage 1 kV, anode currents 2 and 2.5 A), mA/V 36-44
Gain coefficient (grid 2-grid 1) (at anode voltage 1 kV, grid 2 voltage 2 kV, anode current 2 A) 8-12
Interelectrode capacitance, pF:
input, at most 100
output, at most 19
transfer, at most 0.5

Limit Operating Values
Filament voltage (AC or DC), V 6-6.6
Filament starting current, A 90
Anode voltage, kV 6
Grid 2 voltage, kV 1.2
Dissipation, W:
anode 6x10³
grid 2 300
grid 1 50
Operating frequency, MHz 70
Temperature at envelope, stem and glass-to-metal seals, °C 150

gu-47a(2)1.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 0.8kV;
_____ anode;
_ _ _ grid-anode;
_ . _ Pa max

gu-47a(2)2.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 0.9kV;
_____ anode;
_ _ _ grid-anode;
_ . _ grid 2

gu-47a(3)1.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 1kV;
_____ anode;
_ _ _ grid-anode;
_ . _ Pa max

gu-47a(3)2.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 1.2kV;
_____ anode;
_ _ _ grid-anode;
_ . _ Pa max

gu-47a(3)3.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 0.8 kV;
_____ anode;
_ _ _ grid-anode;
_ . _ grid 2 curves

gu-47a(3)4.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 0.9 kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2

gu-47a(3)5.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 1 kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2

gu-47a(4)1.jpg
Averaged Characteristic Curves:
Uf = 6.3V; Ug2 = 1.2kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2