Electro-Harmonix 12AX7 EH Preamp Vacuum Tube


The 12AX7EH provides high gain with ultra low noise and a detailed - musical tone that rivals the most desirable NOS types. Unique spiral filament eliminates that filament-to-cathode induced hum common on AC-powered amps. This tube can be used in phase inverters / preamp sections / driver sections - It really does well in all applications.

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Price is for a single tube with standard testing.

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    I have been using both the 12AT7EH and 12AX7EH tubes and I am extremely happy with the output/control that the Electro Harmonix preamp tubes provide, on both my amps and my client amps. So far, very consistent.
    Thumbs up here!

    reviewed by: SteveT

    great tubes brought a 65 reverb back to life.

    reviewed by: wesley

    Great tone in my Blackstar series one 50. Smooth, full, sound, had them in my Marshall JCM 900 and they sounded great so I thought I would try them in the Blackstar, I'm glad I did!! They smoothed out some of the harshness the old tubes were giving me, seemed to give the amp a little more kick.

    reviewed by: Michael

    Very good tone in a Marshall JTM45 clone !

    reviewed by: Raymond

    Replaced a JJ ECC83S (age unknown) in a Radial Hot British pedal with one of these. The JJ was ok, but I was looking for more filth. Threw in the high gain and low noise options and this thing delivered! I find the distortion dirtier, and the tube is very quiet (quieter than the old one anyway). Very pleased with it.

    reviewed by: Joe

    Definitely an improvement over the sovtek's i bought last time around in '09. Digging the tone on my Crate Stealth 50w Head. Like a whole new amp! I spent the extra for matched, balanced and high gain. Worth the money!

    reviewed by: Jason

    I've gone few 12ax7s in the past. I had the EHX on my Swart SST30 years back and I really loved them. Totally hated the JJs, TungSols were clear but a bit bright and has that constant annoying fizz when pushed. Don't get fooled by its price, EHX 12ax7 are great preamp tubes, my new and returned fave! Get them matched, balanced and checked for few extra bucks. Mine came noiseless and perfect. Tube Depot is very dependable and I'll be shopping here again for more. Thanks, folks!

    reviewed by: Denny I

    Given the low price of these tubes it's easy to overlook them. In my experience they are excellent performers. I've used them in two different audio systems with great results. They're on the warm side. They work very well in a application where the goal is a warm musical tone. I actually preferred them to a couple of NOS 12AX7 tubes. Don't be fooled by the low price. These are excellent tubes. Order the low noise/microphonics for the best result, and get them from Tube Depot.

    reviewed by: Gary