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8540.89.00/Microwave Backward Wave Oscillator Tube/Japan

Microwave Backward Wave Oscillator Tube from Japan

Backward wave oscillator tubes generate tunable microwave signals for test equipment and radar. HTS 8540.89.00 includes these velocity-modulated tubes producing electromagnetic waves through backward wave interaction.

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

• Frequency tuning range and output power specifications critical

• Magnetic field strength requirements for operation documented

• Avoid classification under signal generators (9030.82)

Microwave Backward Wave Oscillator Tube from Japan — Import Duty Rate | HTS 8540.89.00