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Mesa/Boogie Triaxis Guitar Preamp

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$1,491.50

5.0 (22)

3 Critic Reviews

2 Reviews

This product is Vintage or Discontinued

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1 community setup

13 wishlisted

39 saved

Page last updated Jul 04, 2026

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5.0 (21)

$1,491.50 2 available Used

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Description

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Introducing the Mesa/Boogie Triaxis Guitar Preamp, an embodiment of decades of amplifier craftsmanship and innovation. This musical wizard packs the best of Mesa's Mark series into a single rack, offering an exhaustive range of tonal options powered by a tube design. Designed for seasoned musicians and gearheads, the Triaxis provides a versatile control center for your sound, ensuring you're always ready to deliver an unforgettable performance.

Key Features:

Interface: Houses a comprehensive three-band EQ, Dynamic Voice, Variable Gain, Dual Lead Gains, and a Master Volume to shape your sound.
Modes: Features eight distinct modes, including MK I Hyper Clean, MK III Classic High Gain, and MK IV Classic British Lead for versatile playing styles.
Tube Section: Equipped with a 12AX7-powered preamp for that classic, warm tube tone.
Additional Features: Comes with four adjustable function switches, an FX loop, MIDI i/o, and phantom power for enhanced functionality and connectivity.

Product specs

Brand	Mesa Boogie
Model	TriAxis Programmable Pre-Amp
Finish	Black
Year	1990 - 2016
Made In	United States
Categories	Guitar Preamps
Color Family	Black
Electronics	Tube
Number of Channels	3 Channels
Number of Inputs	1 Input
Pedal Format	Rackmount
Reverb	None

FAQs

What type of tubes does the Mesa/Boogie Triaxis Guitar Preamp use?: The Mesa/Boogie Triaxis Guitar Preamp utilizes 12AX7 tubes, known for delivering high gain and a rich tonal palette, ideal for achieving a classic tube-driven sound.
How many channels does the Mesa/Boogie Triaxis offer?: The Mesa/Boogie Triaxis features three channels, each programmable, allowing for a wide range of tones from clean to high-gain distortion.
Is the Mesa/Boogie Triaxis suitable for live performances?: Yes, the Mesa/Boogie Triaxis is designed for both studio and live performances, offering programmable presets and a rackmount format for easy integration into live rigs.
Does the Mesa/Boogie Triaxis have built-in reverb?: No, the Mesa/Boogie Triaxis does not include built-in reverb, allowing users to pair it with their preferred external reverb units for added flexibility.
Can the Mesa/Boogie Triaxis be used with a power amp?: Yes, the Mesa/Boogie Triaxis is designed to be used in conjunction with a power amp, providing a versatile preamp solution for both studio and live settings.

Videos

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Ola Englund

Mesa Boogie Triaxis - Quick Test

Ola Englund

17 minutes of Mesa Triaxis

Michael Nielsen - Big Hairy Guitars

Mesa Triaxis - King of the Rack Preamps?

Leon Todd

Mesa Mark IV vs Triaxis

Leon Todd

Mesa Preamps vs Synergy IICP

Michael Nielsen - Big Hairy Guitars

Mesa TRIAXIS vs H&K ACCESS preamps: Head to Head

Michael Nielsen - Big Hairy Guitars

Mesa Boogie Triaxis - Axe FX 3 vs Real Amp Shootout

The Tone Zone

Mesa Triaxis Preamp - Needles in a Haystack Much?

Psionic Audio

Reviews

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PROS

Nails Mesa Mark series tones, offering a range of iconic sounds
Exceptional clean tones, full sounding and balanced
Compatible with various power amps for enhanced flexibility
Allows for extensive tone customization with eight separate modes
Features both vintage and modern sounds including British lead mode
Built-in presets and MIDI capability for easy sound switching
User-friendly interface with visible settings, avoiding menu diving
Supports both line level and low level effects loops
Ideal for both studio recording and live performances
Durable and reliable build quality, with a heritage of engineering excellence

CONS

Best tones require pairing with specific Mesa power amps, like the 2:90
Some users may find the gain structure slightly grainy
Does not precisely replicate the Mk IIC+ tone, leaning more towards Mk III characteristics
High quality comes with a high price tag, especially for vintage models
The LED readout and non-knob interface might not appeal to all users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Mesa/Boogie Triaxis Guitar Preamp.

Features and functionality

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The v2 with the TX4-D Rectifier board is highly praised and considered one of the best versions of the TriAxis.
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Adding a volume control in the effects loop can help achieve finer control over bedroom-level volumes without losing tone quality.
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Attenuators like the Weber Mass Lite are recommended for stereo setups, requiring two units to handle the dual 50-watt power output effectively.
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Value and pricing

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Prices have increased significantly, with recent purchases ranging from $600 for a beat-up unit to $1600 for a pristine model.
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User experience

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Owners have noted that despite minor issues like blown LEDs, the sound quality remains the most critical aspect and does not disappoint.
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Use cases and applications

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Commonly paired with a Fifty/Fifty power amp and stereo effects, enhancing its versatility and performance in a stereo setup.
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Using a cab sim/IR loader with the Triaxis output into headphones or monitor speakers is suggested for quieter home practice without compromising tone.
Source

Mods and upgrades

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Harley Benton and Bugera attenuators, like the PS1, are affordable options for those who want to manage volume levels while maintaining tone, though some users report a slight treble loss.
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Comparisons

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The Freyette Power Station is praised for minimizing tone alteration during volume reduction.
Source

Critic Reviews

Mesa Boogie TriAxis Review - King of The Rack Preamps!

cigilovic.com

The Mesa/Boogie TriAxis Guitar Preamp is hailed as a versatile, powerful unit that captures the essence of classic Boogie tones. With its broad spectrum of sounds, it's described as an "encyclopedia of Boogie tones" and a must-try for any serious guitarist. The digital controls and MIDI functionality make it an advanced piece of gear for its time, offering ease of use and extensive programmability. However, being a vintage piece, potential buyers should be cautious of cosmetic and functional issues that may arise due to age. Despite this, the TriAxis is lauded for its familiar and robust sound palette, making it a nostalgic yet formidable addition to any setup. Overall, it's praised for its tonal excellence and remains a highly recommended preamp for both collectors and players.

positive

Full Review

Mesa/Boogie Triaxis Programmable Guitar Tube Preamp & Simul-Class 2:Ninety Tube Power Amp – MusicPlayers.com

musicplayers.com

The Mesa/Boogie Triaxis Guitar Preamp is hailed for its exceptional versatility and rich Mark-series tones. With MIDI controllability and memory for up to 90 tone settings, it offers a vast tonal palette that includes everything from vintage Boogie sounds to modern prog metal. When paired with the Simul-Class 2:Ninety power amp, it delivers unmatched stereo power and depth. However, the interface can be tedious, especially when programming switch settings, and the recording outputs are outdated. Despite these minor flaws, the Triaxis remains a beloved piece of gear for its authentic tone and flexibility, making it a worthy investment for serious musicians.

positive

Full Review

Mesa Boogie Triaxis Review

guitarmasterclass.net

The Mesa/Boogie Triaxis Guitar Preamp is a tonal powerhouse, delivering exceptional high-gain and clean tones with remarkable dynamic response. Its intuitive front panel layout ensures easy access to EQs and other controls, making it user-friendly even for those new to preamps. However, the open tube design may concern some users about potential damage if not handled carefully. Despite its steep price, the Triaxis offers versatile sound shaping capabilities, justifying its cost for serious musicians.

positive

Full Review

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5.0 out of 5

Based on 2 Reviews and 22 Ratings

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peterglavanov

713

over 9 years ago

Mesa Boogie Triaxis

I have it in a rack with Mesa Boogie Simul class 2 Ninety power amp.This is a classical combination.I use it mostly in studio.I control it with Abacus midi controller or MusicomLab Mk4. The TRIAXIS™ packs five 12AX7’s and 25 years of tube tone heritage into one rack space of pure magic. Eight separate modes deliver the elusive creamy gain of the Mark I, the heralded focus of the Mark IIC+, the scooped Rhythm of the Mark IV™, and a modified British lead mode. But these are just a few of the classic sounds at your fingertips. Our three years of research produced a patented technology which preserves in every nuance and detail the exact audio elements which made these classic sounds in the first place. The digital circuitry is forced to serve—not dictate the tone.

Each control’s up and down keys work much like an old style knob...all parameters are displayed and active all the time. That means no scrolling to find your Treble on the gig. You don’t have to wonder how your Bass and Mid are set, you can see them from across the stage.

You can store your favorite sounds into 90 user presets and these can be mapped to any of the 128 midi program locations. The TRIAXIS is an arsenal of the most powerful guitar tones available in the world today!