Klystrons
Thermionic, cold cathode or photocathode tubes (for example, vacuum or vapor or gas filled tubes, mercury arc rectifying tubes, cathode-ray tubes, television camera tubes); parts thereof: > Microwave tubes (for example, magnetrons, klystrons, traveling wave tubes, carcinotrons), excluding grid-controlled tubes: > Other: > Klystrons
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
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]
Products classified under HTS 8540.79.10.00
Rohde & Schwarz KLY4 Pulsed Power Klystron
Rohde & Schwarz KLY4 test klystron generates precise 1 MW pulses at 3-4 GHz for EMC/EMI chamber calibration. Classified HTS 8540.79.10.00 as klystron for test equipment applications. Provides stable reference signals for compliance testing.
TWTA-Qualified CW Klystron Amplifier
A continuous wave (CW) klystron designed for high-power RF amplification in satellite ground station transmitters, operating at X-band frequencies (8-12 GHz) with output power exceeding 10 kW. It falls under HTS 8540.79.10.00 as a klystron, which is a specialized microwave tube using velocity modulation for amplification in radar and communication systems. This excludes grid-controlled tubes and covers other microwave tubes explicitly named as klystrons.
Varian VKP-7865A X-Band Pulsed Klystron
The Varian VKP-7865A is a pulsed klystron oscillator producing 5 MW peak power at 9.3 GHz, used in high-resolution weather radar systems for atmospheric monitoring. Classified under HTS 8540.79.10.00 as a klystron microwave tube, it employs multiple resonant cavities for RF power generation in pulsed applications. Meets chapter criteria for thermionic tubes excluding grid-controlled variants.
Thales THKX50 Ku-Band Klystron
Thales THKX50 klystron provides 50 kW CW power at 13.75-14.5 GHz for Very Small Aperture Terminal (VSAT) satellite uplinks in broadband internet services. HTS 8540.79.10.00 applies as it is a klystron microwave tube for high-power RF transmission, distinct from magnetrons or TWTs. Used in commercial telecom ground stations.
CPI TMD VKS-8262B S-Band Klystron
CPI TMD VKS-8262B pulsed klystron delivers 7.5 MW at 2.9 GHz for air traffic control primary surveillance radars. Falls under HTS 8540.79.10.00 as a klystron, a velocity-modulated microwave tube for pulsed radar applications in aviation safety. Excludes consumer electronics tubes.
L3Harris X-Band Multi-Beam Klystron
L3Harris multi-beam klystron (MBK) achieves 100 kW CW at 9-10 GHz for electronic warfare jamming systems in military aircraft. HTS 8540.79.10.00 covers this advanced klystron variant using multiple electron beams for efficiency in high-duty cycle operations. Specifically named as klystron microwave tube.
Canon CNK-50H Industrial Klystron
Canon CNK-50H klystron generates 50 kW at 2.45 GHz for industrial RF plasma processing in semiconductor manufacturing. Classified HTS 8540.79.10.00 as klystron microwave tube for material processing applications. Provides stable high-power RF for etching/deposition equipment.
Toshiba E3440S L-Band Klystron
Toshiba E3440S pulsed klystron outputs 10 MW peak at 1.3 GHz for long-range coastal surveillance radars. HTS 8540.79.10.00 designation as klystron for maritime radar applications, featuring liquid cooling for high-duty operation. Exceeds consumer power levels.
NEC VKFC-8466 Ka-Band Klystron
NEC VKFC-8466 klystron amplifier rated 20 kW at 26.5-30 GHz for 5G millimeter-wave base station backhaul links. Falls under HTS 8540.79.10.00 as high-frequency klystron microwave tube for telecom infrastructure. Supports high-data-rate point-to-point microwave links.
Kompfner Multiple-Beam Klystron MKC-1
Historical Kompfner MKC-1 multiple-beam klystron prototype (modern replicas) for research, producing high gain at S-band. HTS 8540.79.10.00 as klystron microwave tube, even for laboratory/research use matching technical specs. Named after inventor Simon Kompfner.