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GU-43 B


The GU-43B tetrode is used for continuous operation at frequencies up to 100 MHz in separately- or self-excited oscillator circuits and as linear power amplifiers in RF equipment

Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 125 mm.
Diameter: at most 100 mm.
Mass: at most 1.5 kg


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

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 80-100
output 10-18
transfer, at most 0.1
Cathode heating time, s, at most 180
Output power (at anode voltage 3 kV, grid 2 voltage 350 V, anode current 0.9 A), kW, at least 1.6
Output power over 1,000 h of service, kW, at least 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

Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V;
Pa max

Averaged Anode-Grid Characteristic Curves:
Uf = 12.6V; Ug2 = 350V

Averaged Grid 2-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V