GS-1b
TRIODE

The GS-1b 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-31b, but has minor electrical differences.  It's projected operational life is >250 hours, 25% of the GS-31's projected 1000+ hours.  As with most Russian power triodes, the heat sink on the GS-1b is removable.  The GS-1b without a radiator is designated GS-2b. A little-seen variant, the GS-1b-1, exists; it has minor physical differences and a higher input capacitance than the GS-1b. A drawing and capacitance values for the GS-1b-1 appear at the bottom of this page.


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GENERAL
Cathode:  indirectly heated, dispenser, oxide-coated.
Envelope:  metal-ceramic.
Cooling:  forced air.
Height, mm, at most: with heat sink (GS-1b): 147
without heat sink (GS-2b): 134
Diameter, mm, at most: with heat sink (GS-1b): 100.2
without heat sink (GS-2b): 65
Mass, kg, at most: with heat sink (GS-1b): 1.2
without heat sink (GS-2b): 650
gs-1b side view gs-1b diagram
A - anode; C - grid; KP - cathode and heater; P - heater
ENVIRONMENTAL OPERATING CONDITIONS
Vibration loads:
frequency, Hz 5-200
acceleration, m/s² 98
Multiple loads with acceleration, m/s² 343
Ambient Conditions:
Temperature, °C -60 to +70
Relative humidity at up to +40 °C, % 95-98

NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 12.6
Heater current, A 3.2
Mutual conductance (Va = 2KV, Ia = 250 mA, delta Vg = 1V), mA/V 30
Operating point (negative Vg, Va = 2KV, Ia = 250 mA), V 9
input capacitance, pF: 21.5
Maximum output capacitance, pF: 4.5
transfer capacitance, pF: 0.12
Warm up time, s, at most 180
Output power, Va = 1.8KV, Ia = 500 mA, wavelength 60 cm >360
Output power, Va = 1.7KV, Ia = 700 mA, wavelength 30 cm >180
Designed Tube Life (hours) >250

ELECTRICAL PARAMETER LIMITS
Heater voltage, V 11.9-13.3
Heater current, A 2.9-3.5
Mutual conductance (Va = 2KV, Ia = 250 mA, delta Vg = 1V), mA/V 25-35
Operating point (negative Vg, Va = 2KV, Ia = 250 mA), V 6-12
input capacitance, pF: 19-24
output capacitance, pF: 3.8-5.2
DC Anode voltage, KV: 3
Anode voltage, instantaneous value, KV: 6
Grid voltage (instantaneous value), V -400 to +120
Cathode current (r.m.s. value), A 1.4
Anode Dissipation, W: 1.0x103
Grid Dissipation @<60°C / @100-120 °C, W: 22 / 15
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
Ia-vs-Va
Averaged Characteristic Curves:
Uf = 12.6V;
_______ grid;   _ _ _ _ grid-anode;   (voltage noted on each trace)


Pout
(Watts)
 
 
 
 
gs-1b pwr @ 28cm
Anode Current (mA)
Averaged Characteristic Curves:
Uf= 12.6V; Wavelength = 28cm

Pout
(Watts)
 
 
 
 
gs-1b pwr @ 60cm
Anode Current (mA)
Averaged Characteristic Curves:
Uf= 12.6V; Wavelength = 60cm

GS-1b-1 Triode
gs-1b side view
A - anode; C - grid; KP - cathode and heater; P - heater
Input capacitance is 23.5 +/- 2.5 pF, 2 pF higher than the GS-1b.