Other
Thermionic, cold cathode or photo-cathode valves and tubes (for example, vacuum or vapour or gas filled valves and tubes, mercury arc rectifying valves and tubes, cathode-ray tubes, television camera tubes). > Other valves and tubes: > Other > Other
Duty Rate (from China)
Products classified under Tariff item 8540.8
12AX7/ECC83 Dual Triode Tube
The 12AX7/ECC83 is a miniature dual triode vacuum tube used as a low-noise voltage amplifier in audio preamplifiers, guitar amplifiers, and vintage radio receivers. It falls under this tariff item as a receiver or amplifier valve, amplifying weak signals without rectifying or switching functions.
8540.81.006L6GC Beam Power Amplifier Tube
The 6L6GC is a beam power tetrode vacuum tube used as an output amplifier in audio amplifiers for radios and musical instruments. It is classified under this item as an amplifier tube, converting input signals into higher-power output for speakers.
8540.81.006V6GT Beam Tetrode Tube
The 6V6GT is a beam tetrode vacuum tube used in output stages of small radio receivers and musical instrument amplifiers. It qualifies as an amplifier tube under this tariff item, providing power amplification for audio signals.
8540.81.007025 Pentode Audio Output Tube
The 7025 is a ruggedized military-spec pentode vacuum tube, equivalent to the 12BY7, used in audio output stages and vertical deflection amplifiers in vintage television receivers. Its durable construction suits harsh environments, and it operates as a receiver or amplifier valve by controlling electron flow between electrodes. This tariff item covers thermionic valves and tubes of this kind, excluding cathode-ray tubes and other specialized types.
8540.81.00ECC88/6DJ8 Low-Noise Triode
The ECC88/6DJ8 is a dual triode vacuum tube known for its low noise in phono preamplifiers and RF front-ends. It falls under this tariff item as an amplifier tube, amplifying weak audio or radio frequency signals with high fidelity.
8540.81.00EF86 Pentode Vacuum Tube
The EF86 is a high-gain pentode vacuum tube designed for low-noise audio preamplification in radio receivers and hi-fi equipment. It is classified under this tariff item as an amplifier tube, boosting weak signals for further processing.
8540.81.00EL34 Pentode Power Tube
The EL34 is a power pentode vacuum tube used in audio power amplifiers for hi-fi and guitar amplifiers. It falls under this tariff item as an amplifier tube, delivering high output power for audio signals.
8540.81.00KT88 Beam Power Tube
The KT88 is a large beam power tetrode vacuum tube capable of high output in audio amplifiers. It is classified under this tariff item as an amplifier tube, providing linear power amplification for hi-fi and professional audio systems.
8540.89.0012AT7 Double Triode Vacuum Tube
The 12AT7 (ECC81) is a medium-gain dual triode vacuum tube essential for audio preamplifiers in guitar amps and hi-fi systems. It is classified under this tariff item as a thermionic tube with multiple electrodes.
8540.89.001BV7 Photomultiplier Tube Diode
The 1BV7 is a vacuum tube diode-triode used in photomultiplier applications for detecting low levels of light in scientific instruments. It features a photocathode and multiplier stages within a thermionic tube structure.
8540.89.002C51 Beam Power Triode Tube
The 2C51 is a subminiature beam power triode vacuum tube designed for compact audio output stages in portable equipment. It operates as a thermionic valve with beam-forming electrodes, which places it under tariff item 8540.89.00 for other thermionic valves and tubes. Its small size and high efficiency make it suitable for military and portable audio applications.
8540.89.006AL5 Electron Tube Diode-Triode
The 6AL5 is a miniature dual diode-triode vacuum tube used in RF detection and FM discriminator circuits in vintage radios. It combines thermionic diode and triode sections in a glass envelope, qualifying it as an 'other' thermionic valve under tariff item 8540.89.00. Its dual-function design makes it a versatile component for audio and radio frequency applications.
8540.89.006BA6 Pentagrid Triode Converter Tube
The 6BA6 is a heptode/pentagrid triode vacuum tube designed for superheterodyne radio frequency conversion. It functions as a multi-grid thermionic tube, combining triode and heptode sections, which classifies it under tariff item 8540.89.00 for other thermionic valves. Its design enables efficient frequency mixing in radio receivers.
8540.89.006BQ5/EL84 Power Pentode Triode
The 6BQ5/EL84 is a beam power pentode vacuum tube used for audio output in compact hi-fi and guitar amplifiers. It is a multi-electrode thermionic tube with output transformer coupling capability, placing it under tariff item 8540.89.00 for other thermionic valves. Its high power output and low distortion make it popular in audio equipment.
8540.89.006SN7GT Dual Triode Audio Tube
The 6SN7GT is an octal base dual triode vacuum tube prized for phase inverters and driver stages in hi-fi and guitar amplifiers. It qualifies as a medium-mu thermionic triode in a glass envelope, falling under tariff item 8540.89.00 for other thermionic valves. Its dual triode configuration provides balanced performance in audio circuits.
8540.89.00Argon Ion Gas Laser Tube
An argon ion gas laser tube generates blue-green laser light through an electrical discharge in argon gas, commonly used in scientific research and holography. As a gas-filled electron tube, it falls under tariff item 8540.89.00 for other valves and tubes.
8540.89.00Cesium Iodide Photocathode Tube
The Cesium Iodide Photocathode Tube is a vacuum photocathode tube for soft X-ray detection in plasma physics experiments, featuring a reflective photocathode geometry for 150-1200eV photons. It provides quantum efficiency greater than 20% at 6keV, classifying it as an 'other' thermionic, cold cathode, or photo-cathode valve under tariff item 8540.89.00. Its specialized design supports advanced scientific research applications.
8540.89.00Channeltron Electron Multiplier Tube
The Channeltron Electron Multiplier Tube is a continuous channel electron multiplier tube for mass spectrometry, providing gain greater than 10^8 with 100ps FWHM timing resolution. It features curved channel geometry for high count rates up to 10^7 cps, classifying it as an 'other' thermionic, cold cathode, or photo-cathode valve under tariff item 8540.89.00. Its high performance makes it essential for analytical instruments.
8540.89.00CO2 Laser Gas Discharge Tube
A CO2 laser gas discharge tube uses a high-pressure CO2-N2-He gas mixture to produce 10.6μm infrared laser output for material processing. The RF or DC excited gas discharge qualifies it as a vapor electron tube under this tariff item.
8540.89.00Cold Cathode Ion Gauge Tube
A cold cathode ion gauge tube is a vacuum measurement device that ionizes residual gas molecules through a high-voltage discharge between electrodes, generating a current proportional to pressure. It falls under this tariff item as an 'other' cold cathode tube used for ultra-high vacuum measurement.
8540.89.00CV4010/6005W Audio Triode
The CV4010/6005W is a ruggedized dual triode vacuum tube for aircraft communication systems. It is classified under tariff item 8540.89.00 for its thermionic construction designed for high-vibration environments. Its military-grade durability ensures reliable performance in demanding applications.
8540.89.00Deuterium Arc Lamp Electrode Tube
A deuterium arc lamp electrode tube is a gas discharge tube filled with deuterium gas, producing a continuous UV spectrum for spectroscopy applications. It is classified here as an 'other' gas-filled tube where a cathode-initiated arc discharge generates light.
8540.89.00Deuterium Stabilized Gas Laser Tube
A deuterium stabilized gas laser tube provides stable UV output for spectroscopy using gas discharge excitation. The sealed tube contains deuterium at low pressure, classifying it as a gas electron tube under this tariff item.
8540.89.00E88CC/6922 Frame Grid Triode
The E88CC/6922 is a premium frame-grid dual triode vacuum tube for professional audio and measurement equipment. It is classified under tariff item 8540.89.00 due to its advanced thermionic construction with rigid frame grid elements. Its low noise and high transconductance make it ideal for high-fidelity applications.
8540.89.00EF86 High-Frequency Pentode Triode
The EF86 is a high-gain pentode vacuum tube used as the first audio stage in classic guitar amplifiers. It is classified under tariff item 8540.89.00 for its multi-electrode thermionic construction equivalent to triode-pentode functions. Its low noise and high gain make it a preferred choice for preamplifier stages.
8540.89.00Geiger-Mueller Counter Tube
A Geiger-Mueller counter tube detects ionizing radiation through gas ionization avalanche in a cylindrical gas volume. Essential for radiation monitoring, it classifies as a gas electron tube under this tariff item.
8540.89.00Grid-Controlled Vacuum Tube
A grid-controlled vacuum tube, such as a triode, uses a control grid to modulate electron flow from a heated cathode to an anode for amplification in audio and RF circuits. This thermionic tube falls under this tariff item as an 'other' valve or tube.
8540.89.00Helium-Neon Laser Plasma Tube
A helium-neon laser plasma tube generates visible laser light through gas discharge excitation of a helium-neon mixture. Used in alignment and metrology, it qualifies as a gas electron tube under this tariff item.
8540.89.00Hydrogen Thyratron Pulse Modulator Tube
A hydrogen thyratron is a gas-filled tube containing hydrogen gas at low pressure, designed for high-speed, repetitive high-voltage switching in pulse power applications like radar modulators. It is classified here as an 'other' gas-filled tube optimized for fast recovery.
8540.89.00Ignitron Mercury Arc Rectifier Tube
An ignitron is a large mercury arc rectifier tube used for high-current DC power conversion in industrial applications. It operates via a cathode pool and an ignition electrode, and is classified here as an 'other' mercury vapor-filled tube.
8540.89.00Ignitron Mercury Pool Tube
An ignitron mercury pool tube is a high-current mercury vapor gas tube used for welding control and electrolytic processes, igniting a mercury vapor arc for conduction. It qualifies under this tariff item as a vapor electron tube.
8540.89.00Klystron Gas-Loaded Reflex Tube
A gas-loaded klystron tube uses controlled gas pressure for microwave power generation in scientific accelerators. The gas affects electron velocity, qualifying it as a vapor electron tube under this tariff item.
8540.89.00Klystron Power Amplifier Tube
A klystron is a linear beam vacuum tube that amplifies microwave signals through velocity modulation of an electron beam. It is used in high-power applications like radio transmitters and particle accelerators, and falls under this tariff item as an 'other' thermionic tube.
8540.89.00Magnetron Gas-Filled Amplifier Tube
A gas-filled magnetron tube amplifies microwave signals using crossed-field electron interaction in low-pressure gas. Used in radar amplifiers, it classifies as a gas electron tube under this tariff item.
8540.89.00Magnetron Injection-Locked Tube
A magnetron injection-locked tube is a specialized thermionic tube that uses injection locking circuitry to achieve phase control for coherent microwave power combining in radar systems. It falls under this tariff item as an 'other' thermionic tube.
8540.89.00Magnetron Oscillator Tube
A magnetron oscillator tube is a high-power vacuum tube that generates microwave frequencies through the interaction of an electron stream from a heated cathode with a magnetic field. It is classified here as an 'other' thermionic tube for microwave generation.
8540.89.00Mercury Arc Rectifier Gas Tube
A mercury arc rectifier tube converts AC to DC using ionized mercury vapor in a vacuum envelope, historically used in industrial power supplies. Though largely obsolete, it remains classified as a gas-filled electron tube under this tariff item.
8540.89.00Microwave Backward Wave Oscillator Tube
A backward wave oscillator tube generates tunable microwave signals through velocity modulation and backward wave interaction, used in test equipment and radar. It falls under this tariff item as an 'other' thermionic tube producing electromagnetic waves.
8540.89.00Neon Glow Transfer Tube
A neon glow transfer tube uses low-pressure neon gas for counting circuits in radiation detectors and logic applications. The gas discharge creates visible glow states for switching, fitting this tariff item as a vapor electron tube.
8540.89.00Photomultiplier Tube (PMT)
A photomultiplier tube (PMT) converts weak light signals into electrical pulses through electron multiplication across multiple dynodes, starting from a photocathode. It is classified here as an 'other' photocathode tube for photon detection in scientific instruments.
8540.89.00Proportional Counter Gas Tube
A proportional counter gas tube uses gas multiplication for precise radiation spectroscopy in nuclear physics. The gas amplification region creates proportional charge pulses, fitting this tariff item as a gas electron tube.
8540.89.00Radiation Counter Geiger-Müller Tube
A Geiger-Müller tube is a gas-filled tube that detects ionizing radiation through avalanche multiplication of electrons in a detection gas. It is classified here as an 'other' gas-filled tube specifically designed for radiation measurement.
8540.89.00Spark Gap Gas Switch Tube
A pressurized gas spark gap tube provides fast high-voltage switching for pulse power systems and lightning protection. The controlled gas breakdown voltage enables precise switching, under this tariff item.
8540.89.00Thyratron Gas-Filled Switching Tube
A thyratron is a gas-filled tube containing low-pressure inert gas, used for high-power switching and rectification in industrial applications. It operates through controlled gas ionization and falls under this tariff item as an 'other' gas-filled tube.
8540.89.00Traveling Wave Tube (TWT)
A traveling wave tube (TWT) is a velocity-modulated tube that provides high-gain amplification at microwave frequencies, essential for satellite communications and military radar. It is classified here as an 'other' thermionic tube.
8540.89.00Trigger Tube for Strobe Systems
A trigger tube for strobe systems is a gas-filled tube that initiates high-voltage discharge in strobe or flash systems through controlled gas ionization. It falls under this tariff item as an 'other' gas-filled tube designed for switching high-power lighting circuits.
8540.89.00Xenon Flashtube Trigger Gas Tube
A xenon flashtube trigger tube initiates high-power photographic flashes using gas spark discharge. The high-voltage gas breakdown provides reliable triggering, classifying under this tariff item.
8540.89.00Xenon Flashtube Trigger Tube
A xenon flashtube trigger tube is a high-voltage gas tube that triggers xenon flashtubes in high-intensity strobe lighting through gas ionization and capacitive discharge. It is classified here as an 'other' gas-filled tube for initiating flash discharges.