gs-31b

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 (V_a = 2KV, I_a = 250mA, change in V_g = 1V), mA/V, at least 22

Operating point (negative V_g with V_a = 2KV, I_a = 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, V_a = 1.8KV, I_a = 500mA, wavelength 60 cm, W: >360

Output power, V_a = 1.7KV, I_a = 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 V_g with V_a = 2KV, I_a = 250mA), V 6-12

input capacitance, pF 19-24

output capacitance, pF 3.8-5.2

Maximum CW Anode voltage (V_a), KV: 3

Maximum Instantaneous value Anode voltage (V_a), KV: 6

Instantaneous value Grid voltage (V_g), V -400 to +120

Maximum CW Cathode current (I_c), 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:
U_f = 12.6V;
_______ anode;
_ _ _ _ grid-anode gs31b-2
Averaged Characteristic Curves:
U_f= 12.6V;
_______ anode;
_ _ _ _ grid-anode

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

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

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 (V_a = 2KV, I_a = 250mA, change in V_g = 1V), mA/V, at least	22
Operating point (negative V_g with V_a = 2KV, I_a = 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, V_a = 1.8KV, I_a = 500mA, wavelength 60 cm, W:	>360
Output power, V_a = 1.7KV, I_a = 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 V_g with V_a = 2KV, I_a = 250mA), V	6-12
input capacitance, pF	19-24
output capacitance, pF	3.8-5.2
Maximum CW Anode voltage (V_a), KV:	3
Maximum Instantaneous value Anode voltage (V_a), KV:	6
Instantaneous value Grid voltage (V_g), V	-400 to +120
Maximum CW Cathode current (I_c), 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

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