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

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

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 0.8kV;
_____ anode;
_ _ _ grid-anode;
_ . _ P_{a max}

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 0.9kV;
_____ anode;
_ _ _ grid-anode;
_ . _ grid 2

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 1kV;
_____ anode;
_ _ _ grid-anode;
_ . _ P_{a max}

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 1.2kV;
_____ anode;
_ _ _ grid-anode;
_ . _ P_{a max}

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 0.8 kV;
_____ anode;
_ _ _ grid-anode;
_ . _ grid 2 curves

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 0.9 kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 1 kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2

Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 1.2kV;
_____ anode-grid;
_ _ _ grid 1;
_ . _ grid 2

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