GS35b 
Triode 
The GS35b triode provides continuous wave generation in
externalfeedback selfsustained oscillators and groundedgrid amplifiers up to 1,000 MHz.
The GS35a 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 GS35b is removable.

GENERAL  
Cathode: indirectly heated, dispenser, oxidecoated.  
Envelope: metalceramic.  
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 

ENVIRONMENTAL OPERATING CONDITIONS  
Vibration loads: 

frequency, Hz  50200 
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 (V_{a} = 2KV, I_{a} = 250mA, change in V_{g} = 1V), mA/V, at least  32.5 
Operating point (negative V_{g} with V_{a} = 2.5KV, I_{a} = 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, V_{a} = 2.5KV, I_{a} = 700mA, wavelength 60 cm, W:  >800 
Output power, V_{a} = 2.2KV, I_{a} = 800mA, wavelength 30 cm, W:  >350 
Designed Tube Life (hours)  >500 
ELECTRICAL PARAMETER LIMITS  
Heater voltage, V  11.913.3 
Heater current, A  2.653.25 
Mutual conductance (V_{a} = 2KV, I_{a} = 250mA, change in V_{g} = 1V), mA/V, at least  2540 
Operating point (negative V_{g} with V_{a} = 2KV, I_{a} = 250mA), V  612 
input capacitance, pF  1824 
output capacitance, pF  3.85 
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, air cooling W:  1.5x10^{3} 
Anode Dissipation, water cooling W:  2.0x10^{3} 
Grid Dissipation, W:  26 
Temperature at anode lead, °C  200 
Temperature at cathode and grid leads, °C  120 
Wavelength,cm  28100 
Averaged Anode and GridAnode Characteristic Curves: U_{f} = 12.6V _____ anode; _ _ _ gridanode 

