12AX7 / ECC83 / 7025

RCA developed the 12AX7 tube in the 1940s for general purpose high gain amplification. Today, 12AX7 is widely adopted for guitar and audio applications due to its high voltage amplification factor (mu). 12AX7 is indeed the most common preamp tube in use today. We carry a large selection of 12AX7 tubes to help you get the right sonic from your gear. See our Best 12AX7 Review for more information.

12AX7 tube was produced under several different designations such as ECC83, 7025, CV4004. All current production 12AX7 are drop-in replacement. See All about 12AX7 Tube page for answers on common questions about 12AX7.