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Electro-Harmonix 12AX7EH Preamp Tube  

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  • MSRP:
    $22.17
  • Your Savings:
    - $9.48
  • Your Price:
    $1269

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Electro-Harmonix

The Electro-Harmonix 12AX7EH is a preamp tube that provides high gain with ultra low noise. The tube's detailed, musical tone rivals the most desirable NOS types. Unique spiral filament eliminates the filament-to-cathode induced hum common on amps that use AC on the filaments.


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Customer Reviews
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Review Snapshot®

by PowerReviews
Electro-Harmonix12AX7EH Preamp Tube
 
4.1

(based on 32 reviews)

Ratings Distribution

  • 5 Stars

     

    (20)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (2)

  • 1 Stars

     

    (4)

73%

of respondents would recommend this to a friend.

Pros

  • Easy to use (7)
  • Functional (6)
  • Good quality (6)
  • Improves sound (5)

Cons

    Best Uses

    • Concerts (7)
    • Back-up (6)
    • Practicing (6)
      • Reviewer Profile:
      • Experienced (7), Professional musician (3)

    Most Liked Positive Review

     

    Better than Average Tube

    Excellent tubes for alot of applications!
    I've been playing around and using Tube Amps for more than 30 years now. I have tried just about every 12AX7 or 12AX7 family of tubes...Read complete review

    Excellent tubes for alot of applications!
    I've been playing around and using Tube Amps for more than 30 years now. I have tried just about every 12AX7 or 12AX7 family of tubes available. These are very good tubes, If used in the right amp. What I have found is every amp, even the same models of the same brands are different in the way they respond to tubes. This means that you have to experiment to find what sounds good to you in your amp. I put one of these in the V1 in my Fender HRD and it was very "glassy" and articulate, however almost brittle sounding. Too much so for me. I then put it in my Kustom 5H Defender I just got too long ago from Musicians Friend and it was fantastic sounding! With that amp it sounds warm, clear and has just the right amount of clarity and growl at the same time. Incidentally I also tried this tube with the Gold pins which costs about $5.00 more. The Gold Pin tube is warmer, which is good for a bright amp, but in a naturally darker sounding amp like my Bassman it sounded Muddy. The original EH 12AX7 here though was great! My advice is to experiment within your budget and keep these tubes in mind as a great starting point!
    Very Well made tube!
    Very appropiate pricing in today's market! I do wish Musicians Friend would explain their grading system on tubes though, it is very different from other tube supplier's websites. Musicians Friend has very competitive pricing with everyone else, sometimes better, but their grading system is confusing when you are used to terms like "Balanced Triodes", "Matched and balanced" etc. Soft and hard really doesn't tell you much.

    VS

    Most Liked Negative Review

     

    Good Tube

    Seems to be a good tube for the money. Output is average. Very nice balanced sound. No frequencies stuck out like a sore thumb. I have only had these tubes for a week...Read complete review

    Seems to be a good tube for the money. Output is average. Very nice balanced sound. No frequencies stuck out like a sore thumb. I have only had these tubes for a week and already have 30+ hours on them.
    It's a pre amp tube. Not too many features
    All of them I ordered have worked good and are pretty quiet. In terms of white noise
    Good tube for the money. I have used tubes that have cost way more and this one is pretty good, and priced competitively.

    Reviewed by 32 customers

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    Displaying reviews 1-10

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    1.0

    Microphonic after 3 weeks

    By Sounds Underground

    from Chandler, AZ

    About Me Professional Musician

    Ask me a question

    Pros

      Cons

        Best Uses

          Comments about Electro-Harmonix 12AX7EH Preamp Tube:

          I have 3 of these in my USA SVT-CL Ampgeg head. After just a few weeks of moderate playing both preamp tubes became microphonic and the driver tube had a nasty 60hz hum.

          Comment on this review

          (1 of 1 customers found this review helpful)

           
          5.0

          Warm Tube with Great Harmonics

          By Mr. Guitar

          from Appomattox, Va

          About Me Experienced

          Ask me a question

          Pros

          • Easy To Use
          • Functional
          • Good Quality
          • Great harmonics
          • Improves Sound
          • Warm tone

          Cons

          • May Get Muddy
          • May Sound Muddy

          Best Uses

          • Backup
          • Concerts
          • Overdrive Channel
          • Overly Bright Amplifier
          • Practicing

          Comments about Electro-Harmonix 12AX7EH Preamp Tube:

          I have a Fender Super Champ XD and Fender Deluxe Vintage Modified. I'm not an electronics expert so I can't tell you why, but !!!! I don't care for these amplifiers with any other preamp tube. This tube really wakes the VM series amps up. The Super Champ XD only uses one 12AX7 and I only replaced the preamp tube closest to the input jack on the Deluxe VM. This was money well spent, these amps now SOUND GREAT !!!

          Comment on this review

           
          4.0

          great tube

          By goldtop1061

          from sgf,mo

          About Me Experienced

          Verified Buyer

          Pros

          • Easy To Use
          • Good As Any

          Cons

          • Any Tube Can Fail

          Best Uses

          • Concerts
          • Mesa Nomad

          Comments about Electro-Harmonix 12AX7EH Preamp Tube:

          dont waste your money on high priced tubes, a russian tube is a russian tube,who cares what name they have on them they all come from the same factory anyway ! some test better than others its a roll of the dice & these work as good as any i've used

          Comment on this review

           
          4.0

          Tubes ok, but poor packing

          By Bk

          from South

          About Me Professional Musician

          Ask me a question

          Verified Buyer

          Pros

          • Easy To Use
          • Functional
          • Good Quality
          • Improves Sound

          Cons

            Best Uses

              Comments about Electro-Harmonix 12AX7EH Preamp Tube:

              Just like the title - tubes were ok, but there was almost no packing so they rattled around in the box. I'm surprised they still worked!

              Comment on this review

               
              5.0

              Great Tube

              By blacksuit41314

              from Booneville, KY

              About Me Experienced

              Pros

              • Easy To Use
              • Functional
              • Good Quality
              • Improves Sound

              Cons

              • None

              Best Uses

              • Backup
              • Concerts
              • Practicing

              Comments about Electro-Harmonix 12AX7EH Preamp Tube:

              I replaced the stock ECC83 in a Marshall AVT 100 combo with this EH 12ax7 and WOW what a difference.

              Comment on this review

              (1 of 1 customers found this review helpful)

               
              5.0

              nice rounded tone

              By tenpennygrin

              from Maine

              About Me Experienced

              Verified Buyer

              Pros

              • Good Quality
              • Improves Sound

              Cons

                Best Uses

                • Backup
                • Concerts
                • Practicing

                Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                just put a complete set of eh tubes in my peavey classic 30 and it sounds better than it has in a long time. Nice clean tone and nice thick dirty channel and no wierd noises...awesome

                Comment on this review

                (0 of 2 customers found this review helpful)

                 
                3.0

                Sounds sort of like a fuzz box

                By Charles Bradford

                from Onalaska Texas

                About Me Experienced

                Ask me a question

                Pros

                • Easy To Use
                • Functional

                Cons

                  Best Uses

                  • Backup
                  • Concerts
                  • Practicing

                  Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                  They're kind of fuzzy, I'm going back to GT

                  Comment on this review

                  (1 of 1 customers found this review helpful)

                   
                  4.0

                  Nothin' Special

                  By Charles Bradford

                  from Onalaska Texas

                  About Me Experienced

                  Ask me a question

                  Pros

                  • Easy To Use
                  • Functional
                  • Good Quality

                  Cons

                    Best Uses

                    • Backup
                    • Concerts
                    • Practicing

                    Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                    They're good tubes

                    Comment on this review

                    (1 of 5 customers found this review helpful)

                     
                    1.0

                    JUNK!

                    By Bennefield

                    from alabama

                    About Me Professional Musician

                    Ask me a question

                    Pros

                      Cons

                      • Poor Quality

                      Best Uses

                        Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                        I ordered 25 of the 12AX7 everyone said they where great so i was gonna retube every amp I have with them and I did at first they where alright but not great after using 1 amp for less than a week 3 of the tubes burnt out and the other 2 where so weak they where almost dead as well wasnt long after that the rest junked out i have 6 left that measure out alright, bottom line there junk you want a quailty tube use tung-sol its what i have used for years and i will never again try to retube all amps until i get a small batch and try them first electro harmonix tubes are by far the worst money i have ever spent.

                        Comment on this review

                        (1 of 2 customers found this review helpful)

                         
                        5.0

                        Excellent Crunch: VOX AD100VT

                        By wprestidge1

                        from hudson mi.

                        About Me Experienced

                        Verified Buyer

                        Pros

                        • Easy To Use
                        • Functional
                        • Good Quality
                        • Improves Sound
                        • Price

                        Cons

                        • Guessing Game

                        Best Uses

                        • Backup
                        • Concerts
                        • Practicing

                        Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                        Used in my Vox Valvetronix as an OEM direct replacement. I haven't seen any reviews of the Valvetronix, so I thought I would add this review.
                        Improved and tightened the bright crunch and punch on all amp settings especially the US High-Gain channel. Seems a little sloppy on the "really" low end unless you really dial in the Dist./Vol on the individual amp setting(US High-Gain). Sounds more and more like the "Slo" and even the 5150III(with the right pick-ups(SH-5)and other manipulations)
                        I say "guessing game" because you really don't know what you are going to get sound-wise. Tubes are, for the most part, consistent but may slightly vary. You would have to try different types of tubes personally in your amp with your gear instead of reading reviews. (Good thing they are relatively cheap)
                        Extremely pleased with Electro-Harmonix

                        Comment on this review

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