Diodes, triodes and tetrodes
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: > Other tubes: > Other > Diodes, triodes and tetrodes
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 8540.89.00.40
1BV7 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, classified under HTS 8540.89.00.40 as a diode-triode photocathode tube. This tube operates by converting photons to electrons via the photocathode for amplification.
6AL5 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 qualifies under HTS 8540.89.00.40 due to its thermionic diode and triode sections in a glass envelope vacuum tube design. Primarily used in restoration projects and amateur radio equipment.
12AT7 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. Classified under HTS 8540.89.00.40 as a tetrode-equivalent through its dual triode configuration in thermionic vacuum tube form. Known for its low noise and musical tone characteristics.
6BA6 Pentagrid Triode Converter Tube
The 6BA6 is a heptode/pentagrid triode vacuum tube designed for superheterodyne radio frequency conversion. It falls under HTS 8540.89.00.40 as a multi-grid thermionic tube functioning as a triode-heptode combination. Used in classic AM broadcast receivers.
EF86 High-Frequency Pentode Triode
The EF86 is a high-gain pentode vacuum tube used as the first audio stage in classic guitar amplifiers. Classified under HTS 8540.89.00.40 for its multi-electrode thermionic construction equivalent to triode-pentode functionality. Renowned for warm overdrive tone.
6SN7GT 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 amps. It qualifies for HTS 8540.89.00.40 as a medium-mu thermionic triode in glass envelope form. Features indirectly heated cathodes for low hum.
E88CC/6922 Frame Grid Triode
The E88CC (6922) is a premium frame-grid dual triode vacuum tube for professional audio and measurement equipment. Classified under HTS 8540.89.00.40 due to its advanced thermionic construction with rigid frame grid elements. Used in broadcast consoles and test instruments.
2C51 Beam Power Triode Tube
The 2C51 is a subminiature beam power triode vacuum tube for compact audio output stages in portable equipment. Falls under HTS 8540.89.00.40 as a thermionic triode with beam forming electrodes. Used in military communications and vintage hearing aids.
CV4010/6005W Audio Triode
The CV4010 (military 6005W) is a ruggedized dual triode vacuum tube for aircraft communication systems. Classified under HTS 8540.89.00.40 for its thermionic construction designed for high-vibration environments. Features chrome-dome glass for durability.
6BQ5/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. Qualifies under HTS 8540.89.00.40 as a multi-electrode thermionic tube with output transformer coupling capability. Capable of 5W single-ended audio.