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The GS-31 B triode fulfils generation and amplification functions in grounded-grid circuits in continuouswave operation in the decimetric and metric wavelength ranges.

Cathode: indirectly heated, dispenser, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced air.
Height, mm, at most:

with heat sink: 147
without heat sink: 134
Diameter, mm, at most:
with heat sink: 100.2
without heat sink: 65
Mass, kg, at most:
with heat sink: 1.2
without heat sink: 650

A - anode; C - grid; KP - cathode and heater; P - heater

Vibration loads:
frequency, Hz 5-2,000
acceleration, m/s² 98
Multiple loads with acceleration, m/s² 343
Single impacts with acceleration, m/s² 1,470
Linear loads with acceleration, m/s² 490
Ambient temperature, °C -60 to +70
Relative humidity at up to +40 °C, % 98

Electrical Parameters
Heater voltage, V 12.6
Heater current, A 3.1-3.7
Mutual conductance (at anode voltage 2 kV, grid voltage 1 V and anode current 250 mA), mA/V, at least 22
Operating point (negative grid voltage at anode voltage 2 kV and anode current 250 mA), V 6-12
Interelectrode capacitance, pF:
input 19-24
output, at most 0.12
transfer 3.8-5.2
Warm up time, s, at most 120
Output power, W, min.:
at anode voltage 1.8 kV, anode current 500 mA, wavelength 60 cm 360
at anode voltage 1.7 kV, anode current 700 mA, wavelength 30 cm 180

Limit Operating Values
Heater voltage, V 12-13.2
Anode voltage, kV:
DC 3
instantaneous value 6
Grid voltage (instantaneous value), V -400 to +120
Cathode current (r.m.s. value), A 1.4
Dissipation, W:
anode 1.0x103
grid 22
Temperature at anode lead, °C 200
Temperature at cathode and grid leads, °C 120
Temperature at external ceramic parts, °C 250
Wavelength,cm 28-100

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

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

Averaged Characteristic Curves Showing Output Power and Efficiency versus Anode Current:
Uf = 12.6V; L = 30cm;
_____ output power (P);
_ _ _ efficiency (n)

Averaged Characteristic Curves Showing Output Power and Efficiency versus Anode Current:
Uf = 12.6V; L = 30cm;
_____ output power (P);
_ _ _ efficiency (n)