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The GI-42B triode is used as a RF power amplifier.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic with ring leads of cathode
and grid.
Cooling: forced air.
Height: at most 440 mm.
Diameter: at most 230 mm.
Mass: at most 30 kg.


Vibration loads:
frequencies, Hz 1-80
acceleration, m/s² 39
Multiple impacts:
acceleration, m/s² 118
impact duration, ms 4
Ambient temperature, °C -60 to +55
Relative humidity at +35 °C, % 98

Electrical Parameters
Filament voltage (AC or DC), V 14
Filament current, A 480-560
Peak anode current (at negative grid voltage 0.3 kV, excess voltage 1.5 kV), A, at least 300
Negative cutoff voltage (at anode voltage 10kV, anode current 0.1 A), V 300-500
Mutual conductance (at anode voltage 4 kV, anode currents 2.5 and 4.5 A), mA/V 70-100
Static amplification factor (at anode voltages 3 and 4 kV, anode current 4.5 A) 25-35
Peak output power, MW, at least 3.5
Interelectrode capacitance, pF:
input 156-190
output, at most 4
transfer 40-50

Limit Operating Values
Filament voltage (AC or DC), V:
minimum 12.8
maximum 14.2
Filament starting current (peak value), A 1,180
Peak anode voltage, kV 35
Dissipation, W:
anode 18-103
grid 800
Operating frequency, MHz 200
Maximum pulse duration, µs 50
Minimum warm up time, s 180
Anode temperature, °C 250
Temperature at envelope and metal-toceramic seals, °C 155

Averaged Characteristic Curves:
Uf = 14V;
_____ anode;
_ _ _ grid-anode

Averaged Characteristic Curves:
Uf = 14V;
_____ anode-grid;
_ _ _ grid