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The GU-45A triode is used as a power amplifier, modulator or oscillator in RF equipment

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal
Cooling: forced (water for anode, air for stem and envelope)
Height: at most 294 mm.
Diameter: at most 146 mm.
Mass: at most 4 kg


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

Electrical Parameters
Filament voltage, V 7.5
Filament current, A 140-160
Mutual conductance (at anode voltage 4 kV, anode currents 2 and 4 A), mA/V 19.5-28.5
Gain coefficient (at anode voltage 8 kV, anode current 2 A) 19-25
Interelectrode capacitance, pF:
input, at most 41
output, at most 3
transfer, at most 27
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.02 A), V 460-690

Limit Operating Values
Filament voltage, V 7.8
Anode voltage (DC), kV:
at frequencies up to 25 MHz 10.5
at frequencies 25-50 MHz 8.4
Filament starting current, A 225
Anode dissipation, kW 20
Operating frequency, MHz 50
Temperature at envelope and seals, °C 150