Cesium Iodide Photocathode Tube
The Cesium Iodide Photocathode Tube is a vacuum photocathode tube for soft X-ray detection in plasma physics experiments, featuring a reflective photocathode geometry for 150-1200eV photons. It provides quantum efficiency greater than 20% at 6keV, classifying it as an 'other' thermionic, cold cathode, or photo-cathode valve under tariff item 8540.89.00. Its specialized design supports advanced scientific research applications.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a replacement photocathode
Parts of photo-cathode valves are classified under this subheading.
If imported with mounting hardware or vacuum fittings
Other parts of thermionic, cold cathode, or photo-cathode valves are covered here.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Classify the cesium iodide photocathode tube under 8540.89.00 as a photo-cathode valve, and include its technical specifications on the invoice
• If importing for research purposes, check if a research exemption or end-use certificate is available to reduce duties
• Ensure the tubes are packed in specialized containers to prevent damage during shipping, as CBSA may inspect for integrity
Related Products under Tariff item 8540.89.00
12AT7 Double Triode Vacuum Tube
The 12AT7 (ECC81) is a medium-gain dual triode vacuum tube essential for audio preamplifiers in guitar amps and hi-fi systems. It is classified under this tariff item as a thermionic tube with multiple electrodes.
1BV7 Photomultiplier Tube Diode
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.
2C51 Beam Power Triode Tube
The 2C51 is a subminiature beam power triode vacuum tube designed for compact audio output stages in portable equipment. It operates as a thermionic valve with beam-forming electrodes, which places it under tariff item 8540.89.00 for other thermionic valves and tubes. Its small size and high efficiency make it suitable for military and portable audio applications.
6AL5 Electron Tube Diode-Triode
The 6AL5 is a miniature dual diode-triode vacuum tube used in RF detection and FM discriminator circuits in vintage radios. It combines thermionic diode and triode sections in a glass envelope, qualifying it as an 'other' thermionic valve under tariff item 8540.89.00. Its dual-function design makes it a versatile component for audio and radio frequency applications.
6BA6 Pentagrid Triode Converter Tube
The 6BA6 is a heptode/pentagrid triode vacuum tube designed for superheterodyne radio frequency conversion. It functions as a multi-grid thermionic tube, combining triode and heptode sections, which classifies it under tariff item 8540.89.00 for other thermionic valves. Its design enables efficient frequency mixing in radio receivers.
6BQ5/EL84 Power Pentode Triode
The 6BQ5/EL84 is a beam power pentode vacuum tube used for audio output in compact hi-fi and guitar amplifiers. It is a multi-electrode thermionic tube with output transformer coupling capability, placing it under tariff item 8540.89.00 for other thermionic valves. Its high power output and low distortion make it popular in audio equipment.