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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.

gu-71b(2)00071.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 50
acceleration, m/s² 25
Multiple impacts with acceleration, m/s² 118
Lowest permissible ambient temperature, °C -60
Relative humidity at up to +35 °C, % 95-98

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

gu-71b(3)00081.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 350V; Ug3 = 0;
_____ anode;
_ _ _ grid 2-anode;
- Pa max

gu-71b(3)00082.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 400V; Ug3 = 0;
_____ anode;
_ _ _ grid 2-anode;
- Pa max

gu-71b(4)00091.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 12.6V; Ug2 = 350V; Ug3 = 0

gu-71b(4)00092.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 12.6V; Ug2 = 400V; Ug3 = 0