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GU-5A

TRIODE

The GU-5A triode is used for power amplification at frequencies up to 110 MHz in RF equipment and in RF heating generators.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal.
Cooling: forced (water for anode, air for envelope and stem).
Height: at most 210 mm.
Diameter: at most 100 mm.
Mass: at most 1 kg.

gu-5a(1)1.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C 10 to -55
Relative humidity at up to - 25°C,% 98

BASIC DATA
Electrical Parameters
Filament voltage, V 12.6
Filament current, A 20-27
Mutual conductance (at anode voltage 3 kV and anode currents 0.4 and 0.7 A), mA V 12-18
Amplification factor (at anode voltages 2 and 4 kV and anode current 0.5 A) 60-85
Anode current at zero grid voltage (at anode voltage 4 kV), A 0.45-0.75
Interelectrode capacitance, pF:
input, at most 19
output, at most 0.5
transfer, at most 16
Output power (at wavelength 12 m), kW, at least 3.5

Limit Operating Values
Filament voltage, V 12.6
Anode voltage. kV:
at operating frequencies up to 30 MHz . 5
at operating frequencies 30-110 MHz 4
Anode dissipation, kW 3.5
Operating frequency, MHz 110
Temperature at envelope, stem and seals, °C 150

gu-5a(2)1.jpg
Averaged Filament Characteristic Curve: Resistance of filamentary cathode: 0.06 Om

gu-5a(2)2.jpg
Averaged Anode-Grid Characteristic Curves:
_______ Uf = 12.6V;
_ _ _ _ Pa max

gu-5a(3)1.jpg
Averaged Anode Characteristic Curve:
_______ Uf = 12.6V;
_ _ _ _ Pa max

gu-5a(3)2.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 12.6V