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Mesa/Boogie 12AX7 Preamp Tube

Replacement 12AX7 Preamplifier Tube, Providing High-gain Output and Balanced Tonal Response

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Item ID: MB12AX7

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Mesa/Boogie 12AX7 Preamp Tube

$26.00

Mesa/Boogie 6L6 STR 445 Power Tubes - Matched Duet

$91.00

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Mesa/Boogie 12AX7 Preamp Tube

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Q: What is the Mesa/Boogie 12AX7 preamp tube designed for?

The Mesa/Boogie 12AX7 is a high-gain dual-triode preamp tube, essential for shaping the tone and character of many tube amplifiers. It's widely used in guitar, bass, and other audio equipment to provide significant signal amplification, rich harmonics, and the classic warmth associated with tube-driven sound. Musicians seeking everything from sparkling cleans to aggressive overdrive will find this tube crucial for their amplifier's performance.

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Q: How do I properly install a 12AX7 preamp tube in my amplifier?

To install a 12AX7 preamp tube, always ensure your amplifier is powered off and unplugged, and the old tubes have cooled down. Gently grasp the old tube and pull it straight out. Align the pins of the new Mesa/Boogie 12AX7 with the socket holes, then carefully push it straight in until it's seated firmly. Avoid twisting or forcing the tube. If you're unsure, consulting your amp's manual or a Sweetwater Sales Engineer for personalized advice is recommended.

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Q: When should I consider replacing my amplifier's 12AX7 preamp tubes?

You should consider replacing your 12AX7 preamp tubes when you notice a degradation in sound quality, such as increased noise, microphonics (a ringing sound when tapped), loss of gain, or a duller tone. While preamp tubes generally last longer than power tubes, their performance can diminish over time. Regular maintenance ensures your amplifier delivers its best sound, and Sweetwater's free 2-year warranty covers many products for peace of mind.

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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!

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Tech Specs

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

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Reviews

4.7

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Brought the Dark Terror back to life!

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.

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

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.

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.

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