Traveling Wave Tube Amplifier TWT
High-power vacuum tube amplifier using a helix slow-wave structure for microwave amplification in satellite communications. HTS 8540.89.00.80 covers this as other vapor or vacuum filled tubes for RF applications.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If assembled into transmission apparatus
When integrated with modulator/driver, becomes complete transmission equipment.
If for radar apparatus
Radar-specific machines and their tubes fall under telecommunications equipment heading.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• ,Specify helix construction and vacuum envelope in technical literature for proper 8540 classification
Related Products under HTS 8540.89.00.80
Hydrogen Thyratron Switching Tube
Gas-filled switching tube using hydrogen for fast high-power pulse generation in radar and pulsed power systems. Covered by HTS 8540.89.00.80 as other gas-filled tubes.
Storage Tube Memory Device
Electrostatic vacuum tube storing binary data as charge patterns on dielectric surface, read/written by electron beam. Rare computer memory technology classified under HTS 8540.89.00.80 as other tubes.
Geiger-Muller Counter Tube
Gas-filled tube detecting ionizing radiation through avalanche discharge between electrodes. Classified HTS 8540.89.00.80 as other gas/vapor filled tubes for radiation detection.
Xenon Flashtube Trigger Tube
Small gas-filled tube providing high-voltage trigger pulse for xenon flashtubes in photography/strobe lighting. HTS 8540.89.00.80 for other gas-filled tubes.
Spark Gap Protective Tube
Gas-filled tube providing overvoltage protection by controlled spark discharge between electrodes. Used in telecom/power systems. HTS 8540.89.00.80 as other gas-filled tubes.
Vacuum Photomultiplier Tube PMT
A vacuum tube containing a photocathode that emits electrons when struck by photons, which are then multiplied to produce a measurable current. Classified under HTS 8540.89.00.80 as a photocathode tube not specifically covered by other subheadings in heading 8540. Used in scientific instruments like scintillation detectors.