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Mesa/Boogie 12AX7 Preamp Tube

Replacement 12AX7 Preamplifier Tube, Providing High-gain Output and Balanced Tonal Response
29 Write review Item ID: MB12AX7
$26.00 (each)

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Mesa/Boogie 12AX7 Preamp Tube
In Stock!
$26.00 (each)
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Premium-grade Tube from Mesa/Boogie!

The Mesa/Boogie MESA 12AX7 is a premium-grade preamplifier tube. It's designed to provide high gain output with an overall balanced tonal quality. You'll also find that the MESA 12AX7 is both consistent and reliable in its smooth, balanced tonal response. The MESA 12AX7 is a lively, open, and expressive tube.

Mesa/Boogie MESA 12AX7 Preamplifier Tube Features:
  • Premium-grade, high-gain preamplifier tube
  • Delivers a smooth and balanced response across the tonal spectrum
  • Recognized as an extremely lively, open, and expressive tube
  • Important Notice for International Customers: Mesa/Boogie products sold by Sweetwater are intended for use within the United States. We are unable to ship any Mesa/Boogie products outside of the US.
The Mesa/Boogie MESA 12AX7 gives you smooth tube tone that's consistent and reliable!

Additional Media

Guitar Amp Buying Guide
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Tech Specs

  • Type: Preamp
  • Model: 12AX7
  • Quantity: Single
  • Manufacturer Part Number: 750150F

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Customer Reviews

4.7 out of 5

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Great 12AX7s

Based on the descriptions, I went with these for replacement tubes in my Laney VH100R. Very happy with both the high gain and edge of break-up tones - especially as compared to 20 year old stock tubes :) Would happily use these again in the future.
by Amir from Melbourne, FL on

Great for Blackstar HT Club 50 MKII

Improved the clean and dirty channels in my amp. Paired with Genalex KT77's.
by Sweetwater Customer on

A great upgrade to my Orange Micro-Dark

I'm pretty happy. Sweetwater packed the tube very well with lots of padding and a couple of Fragile, please handle with care labels on the box. I took my sweet time and swapped out the stock JJ for the Mesa Boogie 12ax7 preamp tube in about 10 minutes. I have heard different things about touching the tube. I don't touch it with my bare hand, but opt for a thin plastic glove. The reason for this is that I don't want to risk getting oils on the tube because anything collecting on a tube will cause it to eventually overheat and shorten it's life. Bottom line, oil attracts dust. Enough about that. The stock JJ in the Micro-Dark is a quality tube and people love it. Orange didn't cut corners too many corners on the Micro-dark.

I was curious what Mesa Boogie could throw down as they are all about tube amps and I figured for $ that it was worth giving the swap out a go. The changes in tone are subtle. Both the Mesa and the JJ tubes are Hi-Gain. The Mesa Boogie tube seems to tease out a little more clarity of shape (Orange speak for tone) adjustments, this is very noticeable on my HSS American Pro 2 Strat and when played in combination with the Seymour Duncan Humbuckers in my Tele, all heck breaks loose. I'm getting crazy controllable feedback, squeals, break ups, you name it. It's there and usable. I didn't get that control with the JJ as it was definately more on the muddier side. I'm not a coil splitting fan, but both of my Fenders have coil splitting (it's a thing anymore I guess). I was pleasently surprised that the Mesa Tubes made the split coils much more livable. then the JJ did. That was a very obvious bonus. I'm not here to knock the JJ, as I'd put it in any preamp circuit. It's just that the Mesa is putting me more on the edge of the tone that I'm always chasing.
by George Lester from LEBANON, OR on
Music background: Guitar player for 45 years, off and on again Keyboard/Synth player and fairly deep into the Apple Eco System when it comes to Music emulation and recording apps.

Now I'm a little bit closer to that tone

Used this tube to replace the 12AX7 in my Bugera G5 Infinium. It does not make a huge difference but it gets me a little bit close to the tone I'm looking for. Glad I purchased this tube.
by Andrew Cravens from Salt Lake City, UT on

Fender Blues Junior IV

I really like my Fender amp and opted to upgrade the tubes last weekend based on the reviews of the Mesa boogie line. YouTubers were indicating that a tube upgrade would make a difference for an amp.

The upgrade was super easy and the tone's improvement very noticeable.

The Fender Blue Junior IV is a really great amp for players who live and play guitar in a house and just want to chill in the den with clean tones. Replacing the factory stock tubes with these was a great investment. An already super nice product made better.

Thanks to Colton Smiricky, my Sweetwater rep, for doing a great job!
by Ian Wright from LUTHERSVILLE, GA on

It's hard to imagine a more quintessentially modern guitar amplifier than a Mesa/Boogie, and when Sweetwater guitarists want high-gain tone, Mesa is where they start. One thing we love about these amps is their sheer versatility, such as the massive range of tone you get from each channel, the freedom to use the tubes you love, onboard CabClone cabinet emulation, and MIDI control. And it's not just guitar amps - Mesa/Boogie's bass amps and pedals are equally cool. What's more, thanks to our incredibly close relationship with Mesa, you can even customize your own amp right here on Sweetwater's website! Get the sound and style you want from your next amp, with a Mesa/Boogie from Sweetwater.

See also: Amp Tubes, Mesa/Boogie, Mesa/Boogie Guitar Amp Tubes
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