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The GU-48 triode is designed for use in RF electroheating installations

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass, no-base.
Height: at most 230 mm.
Diameter: at most 115 mm.
Mass: at most 850 g


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

Electrical Parameters
Filament voltage, V 10
Filament current, A 9.2-10.8
Gain coefficient (at anode voltage 2-1.2 kV, anode current 200 mA) 29-41
Anode current, mA:
at anode voltage 2.5 kV and grid voltage -50V 60-200
at anode voltage 100 V and grid voltage 100 V 500-900
Interelectrode capacitance, pF:
input 11-15
output 9-13
transfer 5.5-8
Output power (at anode voltage 2.5 kV, operating frequency 35-40 MHz), W, at least 700
Output power over 1,000 h of service, W, at least 550

Limit Operating Conditions
Filament voltage, V 9.5-10.5
Anode voltage, kV 3
Filament starting current, A 15
Anode dissipation, W 300
Operating frequency, MHz 75
Envelope temperature, °C 270