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GU-43A

TETRODE

The GU-43A tetrode is designed for continuous operation at frequencies up to 100 MHz in RF power amplifier circuits, and as linear power amplifiers in RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated
Envelope: glass-to-metal
Cooling: liquid
Height: at most 125 mm
Diameter: at most 85 mm
Mass: at most 0.7 kg

gu-43a(1)1.jpg
ĘP - cathode and heater; P - heater; C2 - grid 2; C1 - grid 1; A - anode

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 10-200
acceleration, m/s² 59
frequencies, Hz 200-600
acceleration, m/s² 20
Multiple impacts with acceleration, m/s² 343
Linear leads with acceleration, m/s² 147
Relative humidity at up to +40 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 12.6
Heater current, A 6-7.2
Mutual conductance (at anode voltage 1 kV, grid 2 voltage 350 V, anode current 1 A, grid 1 voltage change ±2.5 V), mA/V 40-50
Negative bias voltage (at anode voltage 1 kV, grid 2 voltage 350 V, anode current 1 A), V 20-30
Interelectrode capacitance, pF:
input, at most
80-100
output, at most 10-18
transfer, at most 0.1
Cathode heating time, s, at most 180
Output power, kW, min.:
at anode voltage 3 kV, grid 2 voltage 350 V, anode current 0.9 A 1.6
over 1,000 h of service 1.3

Limit Operating Values
Heater voltage, V 11.3-13.9
Anode voltage, kV 3.3
Grid 2 voltage, V 500
Negative grid 1 voltage, V 200
Cathode current, A:
DC component 1
peak value 3.2
Dissipation, W:
anode 1,000
grid 2 28
grid 1 5
Temperature at seals, °C 150

gu-43a(2)1.jpg
Averaged Anode Characteristics:
Uf = 12.6V;Ug2 = 350V;
—— • —— Pa max

gu-43a(2)2.jpg
Averaged Anode Grid Characteristic Curves:
Uf = 12.6V; Ug2 = 350V

gu-43a(2)3.jpg
Averaged Grid 2-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V