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The GU-21 B triode is designed for use as an amplifier or oscillator tube at frequencies up to 26 MHz in grounded-grid circuits and in circuits with neutralization.

Cathode: directly heated, carbonized thonated tungsten.
Envelope: glass-to-metal with grid ring.
Cooling: forced air.
Height: at most 355 mm.
Diameter: at most 142 mm.
Mass: at most 8 kg.


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

Electrical Parameters
Filament voltage, V 8.3
Filament current, A 140-160
Mutual conductance (at anode voltage 2 kV, anode currents 2 and 4 A), mA/V 25-35
Gain coefficient (at anode voltages 2 and 5 kV and anode current 2 A) 41-55
Anode current at zero grid voltage (at anode voltage 5 kV), A 1.1-2.3
Interelectrode capacitance, pF:
input, at most 55
output, at most 1.5
transfer, at most 45

Limit Operating Values
Filament voltage, V 7.8-8.3
Anode voltage, kV 9
Filament starting current, A 225
Dissipation, W:
anode 1.0x104
grid 600
Operating frequency, MHz 26
Temperature at envelope, stem and seals, °C 150