GS-31b
Triode

The GS-31b triode fulfills generation and amplification functions in grounded-grid circuits in continuous wave operation in the decimetric and metric wavelength ranges. It is physically identical to the GS-1b, but with minor electrical differences.


GENERAL
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
gs-1b side view gs-31b photo
gs-31b diagram
A - anode; C - grid; KP - cathode and heater; P - heater
ENVIRONMENTAL OPERATING CONDITIONS
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 Conditions:
Temperature, °C -60 to +70
Relative humidity at up to +40 °C, % 98

NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 12.6
Heater current, A 3.4
Mutual conductance (Va = 2KV, Ia = 250mA, change in Vg = 1V), mA/V, at least 22
Operating point (negative Vg with Va = 2KV, Ia = 250mA), V 9
input capacitance, pF 21.5
output capacitance, at most, pF 4.5
transfer capacitance, pF 0.12
Warm up time, s, at most 120
Output power, Va = 1.8KV, Ia = 500mA, wavelength 60 cm, W: >360
Output power, Va = 1.7KV, Ia = 700mA, wavelength 30 cm, W: >180
Designed Tube Life (hours) >1000

ELECTRICAL PARAMETER LIMITS
Heater voltage, V 12-13.2
Heater current, A 3.1-3.7
Operating point (negative Vg with Va = 2KV, Ia = 250mA), V 6-12
input capacitance, pF 19-24
output capacitance, pF 3.8-5.2
Maximum CW Anode voltage (Va), KV: 3
Maximum Instantaneous value Anode voltage (Va), KV: 6
Instantaneous value Grid voltage (Vg), V -400 to +120
Maximum CW Cathode current (Ic), A 1.4
Anode Dissipation, W: 1.0x103
Grid Dissipation, W: 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

gs31b-1
Averaged Characteristic Curves:
Uf = 12.6V;
_______ anode;
_ _ _ _ grid-anode
gs31b-2
Averaged Characteristic Curves:
Uf= 12.6V;
_______ anode;
_ _ _ _ grid-anode
gs31b-3
Averaged Characteristic Curves Showing Output Power and Efficiency versus Anode Current:
Uf = 12.6V; L = 30cm;
_______ output power (P);
_ _ _ _ efficiency (n)
gs31b-4
Averaged Characteristic Curves Showing Output Power and Efficiency versus Anode Current:
Uf = 12.6V; L = 30cm;
_______ output power (P);
_ _ _ _ efficiency (n)