Magnavox 21PT4487 Monochrome CRT Tube
A 21-inch monochrome cathode-ray tube used in oscilloscopes and older video monitors, with a single phosphor layer for green display. Classified under HTS 8540.60.00 as other cathode-ray tubes, as it doesn't fit camera tube definitions and exceeds typical monochrome specs in some contexts. Electron beams strike the phosphor screen to produce visible traces.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specifically for data/industrial display under monochrome provisions
Certain monochrome tubes for data display have dedicated subheadings in 8540.40, differing from general other CRTs.
If imported as part of complete oscilloscope instrument
Complete oscilloscopes classify under 9030 as measuring instruments, with tubes as integral parts.
If for use in automatic data processing input units
CRT input units for ADP machines fall under Chapter 84 heading 8471.
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Import Tips & Compliance
• Confirm not a photocathode camera tube via technical specs; label clearly as monochrome CRT
• Obtain radiation safety certifications for high-voltage components
• Bundle with deflection parts only if sold as complete tube to avoid parts classification
Related Products under HTS 8540.60.00
NEC FP2141G Multi-Sync CRT
21-inch multi-sync CRT supporting various refresh rates for graphic design workstations. HTS 8540.60.00 for versatile other cathode-ray tubes in computing. Aperture grille provides excellent geometry across resolutions.
Thomson 29CFT1B Large Screen CRT
29-inch consumer color CRT for big-screen TVs, with dynamic focus electron gun. Classified in HTS 8540.60.00 as standard other cathode-ray tube. Popular in European and US widescreen models.
Sony Trinitron KV-27FS100 CRT Picture Tube
This is a 27-inch color cathode-ray tube (CRT) designed for consumer television sets, featuring a shadow mask and phosphor-coated screen for high-resolution color display. It falls under HTS 8540.60.00 as an other cathode-ray tube, distinct from television camera tubes or monochrome tubes in other subheadings. The tube generates images via electron beam excitation of phosphors inside a vacuum envelope.
Sony CPM2550X Industrial CRT
25-inch ruggedized CRT for factory automation HMIs and CNC machine displays. Under HTS 8540.60.00 as other cathode-ray tube for harsh environments. Vibration-resistant mounting and bright phosphors for industrial visibility.
Hitachi CPM-1950 Color CRT for Medical Imaging
High-resolution 19-inch color CRT tube designed for medical diagnostic displays, with enhanced phosphor persistence for static imaging. It qualifies for HTS 8540.60.00 as an other cathode-ray tube used in professional monitors. The tube's shadow mask ensures precise color reproduction via RGB electron guns.
Panasonic QD27XS10 Projection TV CRT
27-inch QD (Quick Draw) color cathode-ray tube for rear-projection televisions, optimized for large-screen projection with high brightness phosphors. Falls under HTS 8540.60.00 as other cathode-ray tubes not specified elsewhere. Used in sets like Panasonic PT-53WX54 projection TVs.