Hydrogen Thyratron Pulse Modulator Tube from Canada
Hydrogen thyratrons are specialized gas electron tubes designed for radar pulse modulators and high-voltage switching in scientific instruments. The low-pressure hydrogen gas enables fast switching, qualifying as a vapor electron tube under HTS 8540.89.0020.
Duty Rate — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include operating voltage/current ratings in import docs to distinguish from lower-power tubes
• Ensure supplier provides gas fill type certification to prevent reclassification
• Watch for antidumping duties if sourced from specific Asian manufacturers