Light-sensing tubes
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 > Light-sensing tubes
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 8540.89.00.60
Photomultiplier Tube R928
The Hamamatsu R928 is a head-on type photomultiplier tube featuring a semi-cylindrical photocathode that provides high sensitivity to low light levels. It amplifies photoelectrons through a series of dynodes to produce a measurable electrical signal, making it ideal for scintillation counting and spectroscopy. Classified under HTS 8540.89.00.60 as a light-sensing tube due to its photocathode design for detecting and amplifying faint light signals.
Photocathode Tube for Night Vision
This S-25 spectral response photocathode tube converts available light into electrons via photoelectric effect, amplifying them for low-light imaging in night vision devices. It features a gallium arsenide photocathode optimized for near-infrared sensitivity. Falls under HTS 8540.89.00.60 as a light-sensing photocathode tube, distinct from complete night vision cameras.
Image Intensifier Tube Gen 3
Third-generation image intensifier tube with GaAs photocathode and microchannel plate for 64 lp/mm resolution in military night vision goggles. Amplifies ambient light photons by 50,000x through electron multiplication. HTS 8540.89.00.60 classification applies to the standalone tube as a light-sensing photocathode device.
Scintillation Photomultiplier Tube
High-quantum-efficiency photomultiplier tube paired with NaI(Tl) scintillation crystals for gamma ray spectroscopy in nuclear medicine. Features 10 dynode stages and bialkali photocathode sensitive to 300-650nm emission spectrum. Classified as light-sensing tube under 8540.89.00.60 for its vacuum tube electron multiplication technology.
Vacuum Photodiode Tube
S-4 response vacuum photodiode tube with Cs-O-Ag photocathode for UV light detection in spectrophotometers, featuring fast response time (<2ns) and high radiant sensitivity. Operates without electron multiplication for direct photocurrent generation. HTS 8540.89.00.60 covers this as a light-sensing vacuum tube with photocathode.
Channeltron Electron Multiplier Tube
Burle Channeltron C-30810 continuous channel electron multiplier tube for mass spectrometry, providing gain >10^8 with 100ps FWHM timing resolution. Features curved channel geometry for high count rates up to 10^7 cps. Classified under HTS 8540.89.00.60 as light-sensing tube technology adapted for charged particle detection.
Mercury Arc Light Sensor Tube
Historical mercury arc photocell tube using mercury vapor photocathode for industrial light level monitoring in legacy automation systems. Provides switching function based on light threshold detection. Remains classified under HTS 8540.89.00.60 as vapor-filled light-sensing tube despite obsolescence.
Microchannel Plate Photomultiplier
MCP-PMT with 40mm active area featuring 25μm pore diameter microchannels for high-speed photon counting in PET scanners. Provides <25ps timing resolution for time-of-flight applications. HTS 8540.89.00.60 applies to this advanced light-sensing tube with photocathode and MCP amplification.
Solar Blind Phototube
CsTe solar blind phototube with response peak at 220nm and sharp cutoff at 320nm for ozone monitoring and flame detection. Vacuum tube construction eliminates solar interference in UV spectroscopy. Classified under HTS 8540.89.00.60 as specialized light-sensing tube for UV spectrum.
Vidicon Camera Tube
PbO vidicon photoconductive target tube for analog television cameras featuring Sb2S3 photoconductor layer sensitive to 400-700nm visible spectrum. Provides 700-line resolution for broadcast applications. HTS 8540.89.00.60 classification for legacy light-sensing camera tubes.
Photocathode for Streak Camera
S-20 extended red photocathode tube for picosecond streak cameras, providing 10ps time resolution in laser-plasma interaction studies. Features bi-alkali cathode with 30% QE at 800nm. Classified under HTS 8540.89.00.60 as high-speed light-sensing tube.
Electron Bombardment Phosphor Tube
EBP tube using UV photocathode to generate photoelectrons accelerated onto P46 phosphor screen for cooled IR detection below 77K. Provides high gain (>1000) for astronomical applications. HTS 8540.89.00.60 covers this specialized light-sensing configuration.
Orthicon Camera Tube
Image orthicon tube with low-velocity scanning electron gun and photoemissive target for high-sensitivity TV camera applications in early broadcast systems. Features signal multiplication at target surface. Legacy classification under HTS 8540.89.00.60 for light-sensing tubes.
Cesium Iodide Photocathode Tube
CsI(Tl)-coupled vacuum photocathode tube for soft X-ray detection in plasma physics experiments, featuring reflective photocathode geometry for 150-1200eV photons. Provides quantum efficiency >20% at 6keV. HTS 8540.89.00.60 classification for specialized light/X-ray sensing tube.