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The GI-26B triode provides power amplification in pulsed operation with anode keying.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal with grid rings.
Cooling: forced air.
Height: at most 530 mm.
Diameter: at most 182 mm.
Mass: at most 21 kg.


Vibration loads:
frequency, Hz 50
acceleration, m/s² 24
Ambient temperature, °C -60 to +55
Relative humidity at +40 °C, % 95-98

Electrical Parameters
Filament voltage (AC or DC), V 12.6
Filament current, A 530-590
Resistance of heated cathode, Om 0.002
Mutual conductance (at anode currents 6 and 10 A, anode voltage 2 kv), mA/V 85-110
Gain coefficient (at anode voltages 2 and 3 kV, anode current 6 A) 28-38
Interelectrode capacitance, pF:
input, at most 185
output, at most 3
transfer, at most 75
Peak power output, MW 3

Limit Operating Values
Filament voltage (AC or DC), V 11-13
Filament starting current, A 900
Peak anode voltage, kV 30
Dissipation, kW:
anode 20
grid 2
Anode temperature, °C 180
Temperature at glass and glass-to-metal seals, °C 150

Averaged Characteristic Curves:
Uf = 12.6V;
_____ anode;
_ _ _ grid-anode;
. (Pa max)