Traveling Wave Tube (TWT) from China
Traveling wave tubes are velocity-modulated tubes that provide high gain amplification at microwave frequencies, essential for satellite communications and military radar. HTS 8540.89.00 covers these as other thermionic tubes due to their specialized electron interaction with electromagnetic waves.
Duty Rate — China → United States
41.2%
Rate breakdown
9903.88.0125%Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• ITAR/EAR export licenses frequently required; verify classification before import planning
• Detailed helix structure and collector specifications needed for customs technical review