12AX7 / ECC83 Vacuum Tube – High-Gain Preamp Tube for Guitar Amps & Hi-Fi

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The 12AX7 (ECC83) is the highest-gain common dual triode in guitar amp preamp stages, also widely used in hi-fi and phono preamps. Tube type: High-mu dual triode Base: B9A / Noval 9-pin Heater: 12.6V AC (0.15A) or 6.3V AC (0.3A wired parallel) Typical use: Preamp gain stages in Fender/Marshall-style guitar amps and hi-fi/phono preamps ECC83 equivalent — interchangeable in amps calling for either designation. Show more