8540.79.10.00 - Klystrons

This HTS category, 8540.79.10.00, specifically classifies Klystrons. Klystrons are a type of high-power vacuum tube used primarily for generating and amplifying microwave frequencies. They are essential components in various applications, including radar systems, particle accelerators, and satellite communications. The defining characteristic of a klystron is its method of velocity modulation of the electron beam, which is then bunched and collected by resonant cavities to produce high-frequency electromagnetic waves.

Within the broader heading of microwave tubes, this specific subheading distinguishes klystrons from other types of microwave tubes such as magnetrons or traveling wave tubes. The sibling category, 8540.79.20.00, covers "Other" microwave tubes that do not fall under the specific classifications of klystrons or grid-controlled tubes. Therefore, the key classification criterion for 8540.79.10.00 is the identification of the electron tube as a klystron based on its internal construction and operating principles.

As this is a leaf node in the HTS structure, there are no further subcategories. The classification of klystrons is finalized at this level, meaning that any product identified as a klystron will be classified under 8540.79.10.00, provided it meets the general requirements of heading 8540 for thermionic, cold cathode, or photocathode tubes and the specific requirements for microwave tubes.