8540.89.00.20/Klystron Gas-Loaded Reflex Tube/Japan

Klystron Gas-Loaded Reflex Tube from Japan

Gas-loaded klystron tubes use controlled gas pressure for microwave power generation in scientific accelerators. The gas affects electron velocity, qualifying as vapor electron tubes under HTS 8540.89.0020.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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Import Tips

• Vacuum pumpdown specs must show residual operating gas pressure

• Particle accelerator end-use statement may trigger EAR licensing

• RF power output rating critical for classification