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Electro-Harmonix

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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.
Electro-Harmonix 12AX7EH Preamp Tube

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4.06

18 Reviews

67%

of respondents would recommend this to a friend

Most Liked Positive Review

5

Good tube

Electro Harmonix is one of the best brands.....This tube powers you up with a high amount of gain and no fuzz at all or feedback. Its really good I recommend it

VS

Most Liked Negative Review

3

Microphonic right out of the box... $(NO REFUNDS)$ !!!

I roll tubes (try several different tubes) in the amplifiers I repair. Most guitarists I have worked with have preferred the EH 12ax7 in the first pre-amp slot. I received an order from Guitar Center and the tube was microphonic right out of the box. (GC will not give a refund for tubes). I have knowledge of several now that have gone microphonic within very few hours of service. I do like the sound of the EH 12ax7. Reliability is of concern. To recommend these, I would have to caution the buyer of the mortality issues.

Filters
Best Uses
  1. Concerts4
  2. Practicing4
  3. Back-Up3
Cons
  1. Not Functional1
Describe Yourself
  1. Experienced4
  2. Professional Musician3
Pros
  1. Functional4
  2. Good Quality4
  3. Easy To Use3
  4. Improves Sound3
  5. After and may try several different tubes to see1

Reviewed by 18 customers

  • Microphonic

    2

    submitted2 years ago

    bytim

    fromorlando

    These tubes became microphonic within a month in a 5-watt amp.

  • Not good

    2

    submitted2 years ago

    bytim

    fromorlando

    They went microphonic within a month in a 5 watt amp.

  • ELECTRO-HARMONIX 12AX7EH PREAMP TUBE

    5

    submitted4 years ago

    byEarle

    fromGreater Nashville Area

    I use in various amps for backup, replacement or change in sound characteristics. So far I have installed two of these with good results.

  • I would and am buying 2 more.

    5

    submitted5 years ago

    byDePriest

    fromDyer Tn

    It's a tube. But, it's a good tube for a vox adt 100.

  • One That Works

    5

    submitted5 years ago

    byTip

    fromMobile, AL

    I've been having trouble finding a tube that would work well in my preamp pedal. I finally found one! Other tubes sounded fuzzy and were unusable, especially at lower gain settings.

  • I would buy this product again.

    5

    submitted6 years ago

    byThe Old Guy

    fromSacramento

    In my Bugera Vintage V5 Infinium it is a big improvement over the stock tube. I like the low noise of the 12AX7. With a Jensen speaker the amp sounds great. The amp can be driven into saturation and cutoff when the gain is turned up past 6.

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collapse expand iconQ&A

Have a question about this product? Our expert Gear Advisers have the answers.

  • submitteda year ago

    asked bymike

    fromfl

    12ax7 e, 12ax7 lps, 12ax7 eh, whats the difference for my vox vt30 amp?

    12ax7 e, 12ax7 lps, 12ax7 eh, whats the difference for my vox vt30 amp?

    Open Reply - Gear-Support
    I don't understand your references. This is a 12AX7EH and will work fine in your Vox.

  • submitteda year ago

    asked byYancey

    fromCadillac, MI

    Are these balanced tubes?

    Are these balanced tubes?

    Open Reply - Gear-Support
    I’u very sorry. Your question is not clear. Tubes are matched or biased.

  • submitted2 years ago

    asked byL.

    fromColumbia, MO

    Is this brand compatible with a Behringer MIC2200 Ultrasound Pro preamp?

    Is this brand compatible with a Behringer MIC2200 Ultrasound Pro preamp?

    Open Reply - Thomas
    Yes

  • submitted5 years ago

    asked byAvalon

    fromCONNECTICUT

    Can I use it in a bugera that uses 12ax7b?

    Can I use it in a bugera that uses 12ax7b?

    Open Reply - Kenneth
    It will not be compatible with that model