Other
Thermionic, cold cathode or photocathode tubes (for example, vacuum or vapor or gas filled tubes, mercury arc rectifying tubes, cathode-ray tubes, television camera tubes); parts thereof: > Other tubes: > Other > Other
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified 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.
Magnetron Vacuum Tube for Microwave
A vacuum tube that generates microwave signals through velocity modulation of electrons in a magnetic field, used in radar and microwave ovens. Falls under HTS 8540.89.00.80 as an other vacuum tube not specified elsewhere in 8540. Essential component for high-power RF generation.
Cold Cathode Ion Gauge Tube
A cold cathode vacuum tube that measures pressure by ionizing gas with electron discharge between electrodes. Classified in HTS 8540.89.00.80 as other cold cathode tubes used in ultra-high vacuum systems for scientific and industrial applications.
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.
Photocathode Image Intensifier Tube
Vacuum tube with photocathode and microchannel plate that amplifies low-light images for night vision devices. Falls under HTS 8540.89.00.80 as photocathode tube, distinct from complete night vision cameras (8525.83).
Klystron Power Vacuum Tube
Multi-cavity vacuum tube that amplifies RF signals through velocity modulation, used in particle accelerators and transmitters. Classified HTS 8540.89.00.80 as other vacuum tubes for high-power applications.
Mercury Arc Rectifier Tube
Gas-filled tube using mercury vapor arc for high-voltage DC power conversion in industrial applications. HTS 8540.89.00.80 includes mercury arc rectifying tubes as specified in heading description.
Vidicon Television Camera Tube
Photoconductive vacuum tube used in legacy television cameras where light creates stored charge image read by electron beam. HTS 8540.89.00.80 for other television camera tubes not meeting high-speed specs.
Plumbicon Lead Oxide Camera Tube
Advanced photoconductive pickup tube using lead oxide target for superior television camera image quality in professional broadcast. Classified HTS 8540.89.00.80 as other television camera tubes.
Dekatron Cold Cathode Counter Tube
Cold cathode glow discharge tube with multiple electrodes for decimal counting in vintage computers and calculators. HTS 8540.89.00.80 covers as other cold cathode tubes.