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The GU-4A triode oscillates and amplifies power at frequencies up to 100 MHz.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal with ring grid lead.
Cooling: forced (water for anode, air for bulb and metal-to-glass seals, air for stem).
Height: at most 320 mm.
Diameter: at most 152 mm.
Mass: at most 5 kg.


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

Electrical Parameters
Filament voltage (AC or DC), V 8.3
Filament current, A 135-155
Resistance of unheated cathode, Om 0.006
Mutual conductance (at anode voltage 3 kV and anode currents 4 and 6 A), mA/V 20-40
Gain coefficient (at anode current 4 A and anode voltages 3 and 5 kV) 48-70
Output power (at anode voltage 6 kV, anode current at most 6 A, negative grid voltage 40 V), kW, at least 13
Interelectrode capacitance, pF, max.:
input 40
output 1
transfer 35

Limit Operating Values
Filament voltage (AC or DC), V 8.3-8.8
Maximum filament starting current, A 218
Maximum anode voltage, kV 6
Maximum dissipation, W:
anode 2x104
grid 800
Maximum operating frequency, MHz 100
Maximum temperature at bulb and metal-to-glass seals, °C 150