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The GI-26A triode is used as an power amplifier for pulsed operation with anode keying.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal with grid ring.
Cooling: forced (water for anode, grid, filament leads, air for stem and bulb).
Height: at most 530 mm.
Diameter: at most 182 mm.
Mass: at most 13 kg.


Vibration loads:
frequencies, Hz 1-60
acceleration, m/s² 9.8
Ambient temperature, °C -10 to +55
Relative humidity at +40 °C, % 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 85-100
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

Limit Operating Values
Maximum filament voltage (AC or DC), V 13
Minimum filament voltage (AC or DC), V:
in pulsed operation 12
in continuous-wave operation 11
Filament starting current, A 900
Anode voltage, kV:
peak value 30
DC 12
Dissipation, kW:
anode 60
grid 3
Operating frequency, MHz 25
Maximum pulse duration (in operation with single pulses of up to 10 ms duration), µs 1,000
Temperature at bulb, stem, glass-to-metal seals, °C 150

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

Averaged Characteristic Curves:
Uf = 12.6V;
_____ anode-grid;
_ _ _ grid curves