Traveling Wave Tube (TWT) RF Interaction Structure
RF interaction structure (helix assembly) for traveling wave tubes used in satellite communications and high-frequency amplifiers. Falls under HTS 8540.99.4000 as specified for microwave tubes in 8540.71-8540.79. Enables electron beam interaction for RF signal amplification.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for transmission apparatus of 1 GHz or more incorporating TWT
Complete transmission modules classify under telecom equipment rather than tube parts.
If industrial amplifier use without tube specification
Loses specific tube part status, falling to other electrical parts.
Not sure which classification is right?
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Import Tips & Compliance
• Provide frequency range and power specs in import docs to confirm microwave tube compatibility
• ITAR/EAR export controls often apply; ensure proper licensing and end-user statements
• Test for vacuum integrity if applicable, as customs may inspect for contamination risks
Related Products under HTS 8540.99.40.00
CRT Television Electron Gun Assembly
This electron gun assembly is a key component of cathode-ray tube (CRT) televisions, generating and accelerating electron beams to strike the phosphor screen for image display. It falls under HTS 8540.99.4000 as a part specifically designed for thermionic cathode-ray tubes in subheading 8540.71. Used in legacy TV manufacturing and repair.
Microwave Magnetron Electron Gun
Electron gun designed for magnetron microwave tubes used in radar and cooking appliances, emitting electrons into the RF interaction space. Classified under HTS 8540.99.4000 as an RF interaction structure component for microwave tubes of 8540.71-8540.79. Critical for high-power RF generation.
Klystron Tube Electron Gun
Precision electron gun for klystron microwave tubes used in particle accelerators and broadcasting transmitters. HTS 8540.99.4000 covers it as a component for microwave tubes under 8540.71-79. Features high-voltage cathode for focused beam emission.
Oscilloscope Cathode-Ray Tube Electron Gun
Electron gun for high-speed oscilloscope CRTs, providing precise beam deflection for waveform display. Classified in HTS 8540.99.4000 as CRT part under thermionic tubes. Used in test and measurement equipment.
Radar Magnetron RF Interaction Helix
Helix structure for RF interaction in radar magnetron tubes, facilitating microwave generation. HTS 8540.99.4000 applies as RF structure for 8540.71 microwave tubes. Essential for military and aviation radar systems.
High-Voltage Television Camera Tube Electron Gun
Electron gun for television camera tubes (vidicons), accelerating electrons for image sensing. Under HTS 8540.99.4000 as CRT part for imaging tubes in 8540.71. Used in broadcast and industrial cameras.