GU-71B

PENTODE

The GU-71B pentode is used for single-sideband power amplification and for power amplification at frequencies up to 75 MHz in stationary general-purpose RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-to-ceramic, with ring leads or grids and cathode-heater and pin leads of heater.
Cooling: forced air.
Height: at most 165 mm.
Diameter: at most 101 mm.
Mass: at most 1.7 kg.

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	12.6
Heater current, A	6.8-7.5
Anode voltage (DC), kV	35
Grid 3 voltage, V	0
Grid 2 voltage (DC), V	5-17
Negative grid 1 voltage, absolute value, V, at most	80
Anode current (at heater voltage 11.3 V), A, at least	1.2
Grid 2 current, A, at most	92
Mutual conductance, mA/V	52-72
Voltage level of combination frequencies of third and fifth orders relative to main current voltage (at anode voltage 3 kV, anode current 850 mA, grid 2 current at most 92 mA and frequency of oscillations 70 MHz), dB, at most	-39
Cathode heating time, s, at most	210
Oscillatory power under class AB1 amplification (at anode voltage 3 kV, grid 2 current at most 92 mA and frequency of oscillations 0.1 MHz), kW, at least	1.3
Interelectrode capacitance, pF:
input	115-150
output, at most	35
transfer,at most	0.15

Limit Operating Values
Heater voltage (AC or DC), V	12-13.2
Anode voltage, kV	3.5
Peak anode voltage, kV	6.5
Grid 2 voltage, V	400
Grid 1 voltage, absolute value, V	-100
Grid 3 voltage, V	0
Dissipation, W:
anode	1.5x10³
grid 2	32
grid 1	3
Operating frequency, MHz	75
Cathode heating time, s	210
Temperature at stem, anode and metal-to-ceramic seals, °C	200

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 350V; U_g3 = 0;
_____ anode;
_ _ _ grid 2-anode;
- • — P_{a max}

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 400V; U_g3 = 0;
_____ anode;
_ _ _ grid 2-anode;
- • — P_{a max}

Averaged Anode-Grid Characteristic Curves:
U_f = 12.6V; U_g2 = 350V; U_g3 = 0

Averaged Anode-Grid Characteristic Curves:
U_f = 12.6V; U_g2 = 400V; U_g3 = 0

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