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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If solid-state op-amp replacement
Semiconductor audio amplifiers and modules classify under heading 8543 for other electrical machines.
If pre-installed in complete audio amplifier
Tubes assembled into finished amplifiers fall under heading 8518 for sound recording/reproduction.
If when functioning primarily as data storage tube
Storage tubes with electron beam writing capability classify under subheading 8540.40.
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Import Tips & Compliance
• Specify heater voltage (12.6V) and pin configuration (9-pin miniature) to confirm thermionic classification
• Include matching NOS (New Old Stock) certification for vintage tube authenticity requirements
• Watch for matched pair declarations which affect statistical reporting suffixes
Related Products 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.
6BA6 Pentagrid Triode Converter Tube
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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.