Hydrogen Thyratron Pulse Modulator Tube from Mexico
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 — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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