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HSChapter 85
U.S. imports of microwave tubes, not elsewhere specified or included (HS 854079) totaled $9.2M in April 2026, traded with 6 countries.
Importers of Microwave Tubes, Not Elsewhere Specified or Included paid $154K in duties in April 2026 — an effective duty rate of 2.6% on $5.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Microwave Tubes, Not Elsewhere Specified or Included imports of $9.2M in April 2026 ran 45% above the year-to-date monthly average of $6.3M.
Last updated: April 2026 dataKlystrons and other non-magnetron microwave tubes serve high-power, high-frequency applications in particle accelerators, satellite uplink amplifiers, broadcast transmitters, and electronic warfare systems—markets where solid-state alternatives have not fully displaced vacuum-tube technology. The US schedule separates klystrons (8540791000) from all other NESOI microwave tubes (8540792000), with klystrons distinguished by their bunched-electron-beam amplification mechanism. Germany and Japan lead US import supply, followed by France, the United Kingdom, and Canada, reflecting the concentration of advanced microwave-tube manufacturing in a small number of technically sophisticated countries.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Klystrons (8540791000) are velocity-modulation amplifier tubes that use bunched electron beams to amplify microwave signals, commonly found in radar transmitters, particle accelerators, and satellite ground stations. Traveling-wave tubes (TWTs), crossed-field amplifiers, and other microwave amplifier types that do not meet the klystron description fall under 8540792000. The operating principle and internal construction documented in the manufacturer's technical specification determine the correct line.
Certain klystrons and traveling-wave tubes are controlled under the Export Administration Regulations or ITAR based on frequency range, gain, and power specifications, particularly those with radar or electronic warfare applications. Importers should verify the device's classification on the Commerce Control List and consult a licensed customs broker or export-control counsel before entry, especially for units intended for re-export.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| GERMANY | $3.3M | $388K | -$2.9M |
| FRANCE | $3.6M | -- | -$3.6M |
| JAPAN | $2.2M | -- | -$2.2M |
| CHINA | -- | $769K | +$769K |
| UNITED KINGDOM | -- | $744K | +$744K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8540792000 | MICROWAVE TUBES, NESOI | $9.2M | 2.62% | $154K |
| 8540791000 | KLYSTRON MICROWAVE TUBES | $0 | -- | -- |
MICROWAVE TUBES, NESOI
KLYSTRON MICROWAVE TUBES
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8540792000 | MICROWAVE TUBES, NESOI | $2.2M |
| 8540791000 | KLYSTRON MICROWAVE TUBES | $1.2M |
MICROWAVE TUBES, NESOI
50 no
KLYSTRON MICROWAVE TUBES
26 no
MACH FOR RECP/CONVR/TRANS/REGN OF VOICE/IMAGE/DATA
HS 851762
SOLID-STATE NON-VOL SEMICONDUCTOR STORAGE DEVICES
HS 852351
SMARTPHONES
HS 851713
PROCESSORS AND CONTROLLERS, ELECTRONIC INTEG CIRCT
HS 854231
CONTROLS ETC W ELECT APPR F ELECT CONT NOV 1000 V
HS 853710
STATIC CONVERTERS; ADP POWER SUPPLIES
HS 850440
| State | Imports | Exports | Balance |
|---|---|---|---|
| California | $5.9M | $2.0M | -$3.8M |
| Virginia | $3.3M | -- | -$3.3M |
| Massachusetts | -- | $730K | +$730K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LOS ANGELES INTERNATIONAL AIRPORT, CA | $4.7M | $160K | -$4.6M |
| DURHAM, NC | $3.3M | -- | -$3.3M |
| SAN FRANCISCO INTERNATIONAL AIRPORT, CA | $742K | $546K | -$196K |