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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If assembled into complete musical instrument amp
Finished audio amplifiers containing tubes classify under heading 8518.
If solid-state JFET or MOSFET equivalent
Signal amplifiers using semiconductor technology fall under heading 8543.
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Import Tips & Compliance
• Include microphonic testing results as these tubes are sensitive to vibration in amplifier use
• Specify B9A noval base construction to distinguish from subminiature or acorn tubes
• Provide transconductance specifications confirming high-mu pentode characteristics
Related Products under HTS 8540.89.00.40
1BV7 Photomultiplier Tube Diode
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6AL5 Electron Tube Diode-Triode
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12AT7 Double Triode Vacuum Tube
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6BA6 Pentagrid Triode Converter Tube
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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
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