Preferred Series 7025 / 12AX7 Review

Review – Preferred Series 7025 / 12AX7 Tube

4:11 pm

The Preferred Series 7025 is a great sounding 12AX7 tube type that reminds me a little more of the ECC83 that EI made in the old days. That’s a pretty nice compliment. I compared this tube against an old EI and Telefunken smooth plate and there was very little difference. Lots of gain with a rather low noise floor. No microphonics issues at all. Very good considering the large plate size. Spot welding may be better for microphonics than crimped plates. I tried it in all the standard guitar amp duties and it was fine. Fabulous in Blackface Fender amps. We tried this 7025 in a 66 Vibrolux reverb 2×10 combo and the tones were all there. Light and shimmering or really aggressive, it’s all good.

4 Responses

  1. Dr.Cahit Adaoglu
    Dr.Cahit Adaoglu at |

    I have a quick question. I have recently replaced the three preamp tubes (matched Preferred Series 7025) in my Hughes&Kettner Deluxe 36. After the replacement, when I first turned on the amplifier, the second preamp tube had an orange colored burst glow for a second. However, all three preamps are working fine.
    Is there a reason why the new preamp tube had this short duration glow burst during the first run? Thanks in advance.

    1. Jon @ thetubestore
      Jon @ thetubestore at |

      This is perfectly acceptable. Many preamp tubes do this when first powered from a cold state. Not all will of course, but it is not a sign of a problem.

  2. Matthew Parker
    Matthew Parker at |

    I have a question. I just purchased my very 1st tube amp. It’s a Blues JR. IV. The literature that came with it says it has 3 preamp & 2 power tubes. Listed like so…Preamp 3-7025/12AX7A/ECC83. Output 2-EL84/6BQ5. My question is are these 5 different types of tubes? I need to learn what I am using, so that I may better use it. Can u please advise?

    1. Sandra @ thetubestore
      Sandra @ thetubestore at |

      OK so the 7025/12AX7A/ECC83 are all one in the same… think of it like English, French, and Spanish where each type is just a different “word” meaning the same thing. Same goes for the reference to EL84/6BQ5. So you have 3 12AX7 types and 2 matched EL84 tubes in that amplifier.


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