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12AX7 / ECC83 / 7025

RCA developed the 12AX7 tube in the 1940s for general purpose amplification. Today, 12AX7 is the most common preamp tube used in guitar and audio amp due to its high amplification factor (mu).

We carry a large selection of 12AX7 tubes to help you get the right sonic from your gear. See our Best 12AX7 Review for top choices for your application.

We offer single and matched pairs. Matched pair includes two tubes that are matched to each other.

ECC83, 7025, CV4004 are the same tube as 12AX7. All current production 12AX7 are a drop-in replacement for any of these types. See All about 12AX7 Tube page for answers on common questions about 12AX7.