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)
Subheadings
Products classified under Tariff item 8540.89.00
Cold 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.
Deuterium 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.
Grid-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.
Hydrogen 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.
Ignitron 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.
Klystron 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.
Magnetron 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.
Magnetron 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.
Microwave 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.
Photomultiplier 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.
Radiation 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.
Thyratron 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.
Traveling 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.
Trigger 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.
Xenon 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.