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

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

Averaged Anode Characteristics:
U_f = 12.6V;U_g2 = 350V;
—— • —— P_{a max}

Averaged Anode Grid Characteristic Curves:
U_f = 12.6V; U_g2 = 350V

Averaged Grid 2-Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 350V

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