Thyratron Gas-Filled Switching Tube
A thyratron is a gas-filled electron tube used for high-power switching applications in industrial controls and pulsed power systems. It operates by ionizing gas between electrodes to conduct current, fitting under HTS 8540.89.0020 as a gas electron tube distinct from vacuum or photocathode types.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If vacuum-filled rather than gas-filled
Vacuum electron tubes fall under a separate subheading from gas and vapor types.
If imported as complete power supply assembly
If integrated into a finished static converter, it may classify as a power supply component instead of standalone tube.
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Import Tips & Compliance
• Verify tube specifications confirm gas-filled operation (e.g
• hydrogen or mercury vapor) to avoid misclassification as vacuum tubes
• Provide detailed technical datasheets showing electron tube function and gas composition for customs valuation
• Check for export controls on high-power thyratrons used in military applications via BIS regulations
Related Products under HTS 8540.89.00.20
Hydrogen Thyratron Pulse Modulator Tube
Hydrogen thyratrons are specialized gas electron tubes designed for radar pulse modulators and high-voltage switching in scientific instruments. The low-pressure hydrogen gas enables fast switching, qualifying as a vapor electron tube under HTS 8540.89.0020.
Mercury Arc Rectifier Gas Tube
Mercury arc rectifier tubes convert AC to DC using ionized mercury vapor in a vacuum envelope, historically used in industrial power supplies. Though largely obsolete, they remain classified as gas-filled electron tubes under HTS 8540.89.0020.
Deuterium Stabilized Gas Laser Tube
Deuterium gas laser tubes provide stable UV output for spectroscopy using gas discharge excitation. The sealed tube contains deuterium at low pressure, classifying as a gas electron tube under HTS 8540.89.0020 despite laser application.
Argon Ion Gas Laser Tube
Argon ion laser tubes generate blue-green laser light through electrical discharge in argon gas, used in scientific research and holography. Classified as gas-filled electron tubes under HTS 8540.89.0020 based on tube construction.
Ignitron Mercury Pool Tube
Ignitrons are high-current mercury pool gas tubes for welding control and electrolytic processes, igniting mercury vapor arc for conduction. They qualify under HTS 8540.89.0020 as vapor electron tubes.
Magnetron Gas-Filled Amplifier Tube
Gas-filled magnetron tubes amplify microwave signals using crossed-field electron interaction in low-pressure gas. Used in radar amplifiers, they classify as gas electron tubes under HTS 8540.89.0020.