GS-35b
Triode

The GS-35b triode provides continuous wave generation in external-feedback self-sustained oscillators and grounded-grid amplifiers up to 1,000 MHz.  The GS-35a version of this tube which is intended for water cooling, which adds 500W to the allowable anode dissipation.  As with most Russian power triodes, the heat sink on the GS-35b is removable.

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GENERAL
Cathode:  indirectly heated, dispenser, oxide-coated.
Envelope:  metal-ceramic.
Cooling :  forced air.
Height, mm, at most: with heat sink: 177
without heat sink: TBD
Diameter, mm, at most: with heat sink: 100.2
without heat sink: 65
Mass, kg, at most: with heat sink: 2.8
without heat sink: TBD
GS-35b GS-35b
A - anode; C - grid; P - heater; KP - cathode and heater GS-35b
ENVIRONMENTAL OPERATING CONDITIONS

Vibration loads:

frequency, Hz 50-200
acceleration, m/s² 59
Multiple impacts with acceleration, m/s² 343
Linear loads with acceleration, m/s² 88
Ambient Conditions:
Temperature, °C -60 to +70
Relative humidity at up to +35 °C, % 98

NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 12.6
Heater current, A 2.95
Mutual conductance (Va = 2KV, Ia = 250mA, change in Vg = 1V), mA/V, at least 32.5
Operating point (negative Vg with Va = 2.5KV, Ia = 400mA), V 9
input capacitance, pF 21
output capacitance, at most, pF 4.4
transfer capacitance, pF <0.12
Warm up time, s, at most 90
Output power, Va = 2.5KV, Ia = 700mA, wavelength 60 cm, W: >800
Output power, Va = 2.2KV, Ia = 800mA, wavelength 30 cm, W: >350
Designed Tube Life (hours) >500

ELECTRICAL PARAMETER LIMITS
Heater voltage, V 11.9-13.3
Heater current, A 2.65-3.25
Mutual conductance (Va = 2KV, Ia = 250mA, change in Vg = 1V), mA/V, at least 25-40
Operating point (negative Vg with Va = 2KV, Ia = 250mA), V 6-12
input capacitance, pF 18-24
output capacitance, pF 3.8-5
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, air cooling W: 1.5x103
Anode Dissipation, water cooling W: 2.0x103
Grid Dissipation, W: 26
Temperature at anode lead, °C 200
Temperature at cathode and grid leads, °C 120
Wavelength,cm 28-100

gs-35b
Averaged Anode and Grid-Anode Characteristic Curves:
Uf = 12.6V
_____ anode;
_ _ _ grid-anode


gs-35b
Characteristic Anode Voltage Curves:
Output Power vs Anode Current
Uf = 12.6V; Wavelength = 30cm
gs-35b
Characteristic Anode Voltage Curves:
Output Power vs Anode Current
Uf = 12.6V; Wavelength = 60cm