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Electro-Harmonix 12AX7EH Preamp Tube   

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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 desirab...Read More

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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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Review Snapshot

by PowerReviews
Electro-Harmonix12AX7EH Preamp Tube
 
4.2

(based on 43 reviews)

Ratings Distribution

  • 5 Stars

     

    (27)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (2)

  • 1 Stars

     

    (4)

86%

of respondents would recommend this to a friend.

Pros

  • Good quality (13)
  • Improves sound (13)
  • Easy to use (11)
  • Functional (11)

Cons

No Cons

Best Uses

  • Concerts (14)
  • Practicing (13)
  • Back-up (10)
    • Reviewer Profile:
    • Experienced (13), Professional musician (7)

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

 

can bring new life to amp

Bought this to add to arsenal for tube rolling on Vox Night Train 15 (the first version). Too bright/trebly for V1 spot. Also lowered headroom for cleans compared to some old GE...Read complete review

Bought this to add to arsenal for tube rolling on Vox Night Train 15 (the first version). Too bright/trebly for V1 spot. Also lowered headroom for cleans compared to some old GE long gray plates I bought. Dropped in V2 spot with the old GE in V1 and sounds like a brand new amp. Recorded the tube rolling process and you can really hear the difference. EH way too harsh in V1. If you have Night Train I recommend dumping the Sovteks in pre and power amp sections immediately and get some old Amperex (Holland) EL84s for power section and old long plate (black if you can afford) in V1. Have only tried the EH 12ax7 as far as new manufactured but they really shine in V2.

Reviewed by 43 customers

Displaying reviews 1-10

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5.0

Even, Balanced, Quiet, and Articulate for Fender Blackface

By Tim

from Dallas, TX

About Me Experienced

Verified Reviewer

Pros

  • Functional
  • Good Quality
  • Improves Sound

Cons

    Best Uses

    • Concerts
    • Practicing

    Comments about Electro-Harmonix 12AX7EH Preamp Tube:

    Did lots of research for replacement tubes in a Fender Deluxe Reverb Reissue. The stock preamp tubes are Groovetubes, which are noisy, muddy, and overly round to my ears. I replaced V2 (channel two gain stage 1) and V4 (channel two gain stage 2 and reverb return) with the EHX 12AX7. My V4 was blown (reverb became incredibly noisy-turning up reverb knob would let out loud crackling, hiss, and feedback), and the V2 replacement was just as an upgrade. Instant improvement. Noisiness gone. The old muddy and round quality disappeared, everything became more articulate and balanced. It is very even, it doesn't create clarity by accentuating the top end, it just becomes more articulate across the range and gets rid of any mush. I play a Strat and ES-335 in P&W, blues, jazz, gospel, fusion, etc and it makes my amp a great platform for pedals, and doesn't let it get in the way of good tone. It does what it's supposed to.

    Since it's made by EHX in the Russian tube factory that makes other tubes like Sovtek, Genalex, and Mullard, you can expect the quality of the other brands. I was put off from ordering an EHX tube, since I felt like it would be some mass produced cheap garbage (since they mass produce their pedals-not "boutique"), but don't underestimate these tubes. Also, since it's by a bigger company sold to big retailers and in greater quantities, I've seen greater consistency between EHX tubes (no dud tubes-couldn't be expected when ordering lets say 20 JJ or Sovtek) Amazing price, free shipping, and consistently great quality. If anyone is reading this for advice for a Blackface Fender, I'd say stay away from JJ tubes. They seem to be the go-to in tubes, but they really suck the life out of Blackface Fenders like the Deluxe Reverb, Twin Reverb, and Princeton Reverb. Go for EHX, or if you want some more top end and (bright) clarity, look into Tung-Sol or Mullard. These are the most bang for your buck 12AX7's on the market, and have the quality of $40+ tubes.

    Comment on this reviewHelp Icon

     
    4.0

    Great Tone,Noisy

    Pros

    • Improves Sound

    Cons

      Best Uses

        Comments about Electro-Harmonix 12AX7EH Preamp Tube:

        One of the best sounding tubes out there. Although, turning my plexi up to 7 or 8 there is a noisy grrrrrr sound. Don't know if its a bad tube or if they're all that way

        Comment on this reviewHelp Icon

         
        5.0

        yes

        By none

        from colorado springs colorado

        About Me Professional Musician

        Verified Buyer

        Pros

          Cons

            Best Uses

            • Concerts

            Comments about Electro-Harmonix 12AX7EH Preamp Tube:

            tubes for a fender M-80

            Comment on this reviewHelp Icon

             
            5.0

            Electro Harmonix

            By Buzz

            from MN

            About Me Professional Musician

            Verified Buyer

            Pros

            • Improves Sound

            Cons

              Best Uses

              • Concerts
              • Practicing

              Comments about Electro-Harmonix 12AX7EH Preamp Tube:

              Package delivered on time in perfect condition

              Comment on this reviewHelp Icon

              (1 of 2 customers found this review helpful)

               
              5.0

              Good tubes

              By roadman

              from Lafayette, IN

              About Me Experienced

              Ask me a question

              Verified Buyer

              Pros

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

              Cons

                Best Uses

                • Backup
                • Concerts
                • Practicing

                Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                see my revew for the 6L6-EH tubes, I changed them all at the same time.

                Comment on this reviewHelp Icon

                (0 of 1 customers found this review helpful)

                 
                5.0

                good tube

                By toulouse

                from MA

                About Me Professional Musician

                Ask me a question

                Verified Buyer

                Pros

                • Functional
                • Good Quality
                • Improves Sound

                Cons

                  Best Uses

                  • Concerts
                  • Practicing

                  Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                  one of the better new tubes on the market right now

                  Comment on this reviewHelp Icon

                  (0 of 1 customers found this review helpful)

                   
                  5.0

                  Good choice for my needs. Great service via phone.

                  By Ael

                  from Ohio

                  About Me Experienced

                  Verified Buyer

                  Pros

                  • Easy To Use
                  • Good Quality
                  • Improves Sound

                  Cons

                    Best Uses

                      Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                      Used in DAC. Improved sound of my audio system.

                      Comment on this reviewHelp Icon

                      (1 of 1 customers found this review helpful)

                       
                      3.0

                      can bring new life to amp

                      By cam

                      from fayetteville, sc

                      About Me Experienced

                      Pros

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

                      Cons

                      • Very Bright Can Be Con

                      Best Uses

                      • Backup
                      • Practicing
                      • V2 For Vox Night Train

                      Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                      Bought this to add to arsenal for tube rolling on Vox Night Train 15 (the first version). Too bright/trebly for V1 spot. Also lowered headroom for cleans compared to some old GE long gray plates I bought. Dropped in V2 spot with the old GE in V1 and sounds like a brand new amp. Recorded the tube rolling process and you can really hear the difference. EH way too harsh in V1. If you have Night Train I recommend dumping the Sovteks in pre and power amp sections immediately and get some old Amperex (Holland) EL84s for power section and old long plate (black if you can afford) in V1. Have only tried the EH 12ax7 as far as new manufactured but they really shine in V2.

                      Comment on this reviewHelp Icon

                       
                      5.0

                      Great preamp tube

                      By sonoranscout

                      from Phoenix, AZ

                      About Me Experienced

                      Ask me a question

                      Pros

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

                      Cons

                        Best Uses

                        • Backup
                        • Concerts
                        • Practicing

                        Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                        One of my favorite presmp tubes. Sound is well balanced, with good bass, excellent mids, and clear, crisp highs.

                        Comment on this reviewHelp Icon

                        (1 of 6 customers found this review helpful)

                         
                        4.0

                        The tubes arrived undamaged, and on time

                        By k-bone

                        from Lapeer, Michigan

                        About Me Professional Musician

                        Comments about Electro-Harmonix 12AX7EH Preamp Tube:

                        The tubes arrived on time, unscathed and worked perfectly.

                        Comment on this reviewHelp Icon

                        Displaying reviews 1-10

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