1BV7 Photomultiplier Tube Diode from Mexico
The 1BV7 is a vacuum tube diode-triode used in photomultiplier applications for detecting low levels of light in scientific instruments. It features a photocathode and multiplier stages within a thermionic tube structure, classified under HTS 8540.89.00.40 as a diode-triode photocathode tube. This tube operates by converting photons to electrons via the photocathode for amplification.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify tube specifications match subheading notes for photocathode tubes to avoid reclassification to semiconductor diodes (8541)
• Include detailed datasheets showing vacuum tube construction and filament operation in import documentation
• Check for radiation-tolerant variants which may require additional certification under related subheadings