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Hydrogen Thyratrons-GL1154L
Product Name£ºHydrogen Thyratrons-GL1154L
Item No£ºGL1154L

GL1154Lthyratron with ceramic/metal envelope,has the features of fast recovery time, low jitter, quick firing time and low drift. It can be used as pulse switch in high-energy accelerator equipped with magnetron and klystron.

The Hydrogen thyratrons  Cross reference 
E2V: CX1154L

Hydrogen Thyratrons-GL1154L  Download
Product Details Introduction

GL1154L tetrode thyratron with ceramic/metal envelope, featuring fast recovery time, low jitter, firing time and drift, as pulse switch be used in magnetron and klystron pulse modulators.

Anode Characteristics

Peak Forward Anode Voltage            35kV max [1]

Peak Reverse Anode Voltage            35kV max [2]

Peak Forward Anode Current            3kA

Average Anode Current                 2A max

Anode Current Rate of Rise             10kA/us [3] [4]

Pulse repetition rate                    400 pps


Grid 2 Drive                      

Unloaded drive pulse voltage            500V~2000V [5]

Driver circuit output impedance          50~ 500

Rate of rise of grid 2 pulse              10kV/us min [3]

Driver pulse duration                   0.5 us min

Loaded grid 2 bias voltage               0 V~ 150 V

Grid 2 pulse delay                      0.5us ~ 3us

Peak inverse grid 2 voltage              450V max


Grid 1 Pulse Drive

Unload grid 1 drive pulse voltage         300V ~ 1000V [5]

Peak grid 1 drive current                1A~ 5A [6]

Grid 1 pulse duration                   2us min

Rate of rise of grid 1 pulse               1kV/us min [3]

Peak inverse grid 1 voltage               450V max


Grid 1 DC Drive                        

DC grid 1unloaded priming voltage        75V~ 150V

DC grid 1 priming current                75mA ~ 150 mA



Cathode heater voltage                  6.3V~ 6.8V

Cathode Heater current (6.3V)            20A~25A

Reservoir heater voltage                 5.0V~ 6.0V [7]

Reservoir heater current (5.5V)            6A~8A

Cathode heating time(Minimum)          15 minutes

Anode to grid 2 capacitance              15pF~20pF



Dimension and tube connections          See Dimensional Data

Net weight                           About 1.8kg                       

Mounting position                     Any [8]

Cooling way                          Forced-air or liquid immersion [9]



Critical DC anode voltage for conduction   1.0 kV max

Anode delay time                      250ns max [10]

Anode delay time drift                  50ns max [11]

Time jitter                            5ns max


Ambient temperature                   -50˚C~ +90˚C

Altitude                             3km


[1] It is the maximum peak voltage under the condition of resonant charging.

[2] Peak inverse anode voltage (include peak) must not exceed 10KV within 125 us after impulse current discharge finished, otherwise it will damage the grid and cause spark inside the tube and shorten the working life.

[3] This rate of rise refers to that part of the leading edge of the pulse between 26% and 70% of the pulse amplitude.

[4] Under single narrow pulse working condition, rate of rise of anode current can exceed 150kA/us, the final value largely depends on external circuit. 

[5] Measured with respect to cathode. Pre-pulsing of grid 1 is recommended for modulator and high rate of rise of current applications. The last 0.25us of the top of the grid 1 pulse must overlap the corresponding first 0.25us of the top of the delayed grid 2 pulses.

[6] The higher grid 1 is pulsed, the larger must the grid 2 negative bias be, to prevent the tube firing on the grid 1 pulse.

[7] The reservoir heater must be decoupled with a suitable capacitor to avoid damage by spike voltages. Maximum reservoir voltage is one prerequisite for maximum thyratron life. The reservoir voltage should be stabilised to+-0.1 V.

[8] The tube must be fitted using its cathode mounting flange.

[9] If the tube is cooled by forced-air, an air flow of at least 2.83 m3/min is required. Please refer to the following installation diagram:  

[10] The time interval between the instant at which the rising unloaded grid 2 pulse reaches 25% of its pulse amplitude and the instant when anode conduction takes place.

[11] Anode firing delay time drift, the drift in delay time over a period from 10 seconds to 10 minutes after reaching full voltage, its anode firing delays time of change.

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