Warm Audio WA-MPX Tube Preamp

Warm Audio

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Product Code: 3533
$799.00
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The Warm Audio WA-MPX Tube Preamp is an authentic reproduction of the most revered microphone tube preamp that pioneered the birth of rock ‘n’ roll & radio-ready hits.

The WA-MPX is an authentic reproduction of the most revered microphone tube preamp that pioneered the birth of rock ‘n’ roll & radio-ready hits. During the golden-era of tape recording, this style of vintage tube preamp became the signature sound in the signal chain of hit recordings including Elvis Presley, Les Paul, and Bing Crosby - and is a sound that is still pursued by today’s biggest artists. With premium components, true-to-original circuit design, and tape saturation control, the WA-MPX authentically reproduces all the analog tone of the original to bring vintage warmth & color to your sound.

Authentic Reproduction Of The Most Revered Tape-Era Tube Mic Preamp
The WA-MPX is based on the 351-style tube preamplifier found in American tape machines that pioneered the birth of rock ‘n’ roll & radio-ready hits.

Power & Versatility For A Wider Range Of Analog Tone
Delivering an impressive 300v of raw power & 90dB of tube gain, WA-MPX achieves clean gain & powerful volume, that pushes the tubes to saturate just like the most timeless analog gear.

Premium Components & Handwired Construction For An Authentic Vintage Experience
Hand-assembled with three premium tubes per channel paired with custom-wound true-to-spec USA CineMag transformers, the WA-MPX authentically reproduces all the analog tone of the original.

Selectable, All-Analog Tape Saturation
WA-MPX uses discrete analog components that provide compression, saturation, and non-linear frequency response for authentic tape-era reel-to-reel sound at 15IPS.

Hi-Pass (80Hz) & Low-Pass (2kHz) Filters to Refine Tone
The 2kHz low-pass filter allows you to further shape and focus your tone, dialing in ultimate midrange warmth & punch. The 80Hz hi-pass filter helps remove unwanted bass noise from unruly sources.

Hand-Inspected & Tested at Warm Audio HQ in Austin, Texas
Carefully inspected at Warm Audio Headquarters in Austin, Texas by trained engineers & musicians with a passion for helping you sound your best.

Warm Audio WA-MPX Tube Preamp Features

  • Authentic Reproduction Of The Most Revered Tape-Era Tube Preamp
  • Fully Discrete, Hand-Built Construction With 3 Tubes Per Channel For Ultimate Analog Tone
  • Selectable Tape Saturation Adds Harmonic Distortion & Natural Compression
  • 90dB Of Analog Tube Gain Per Channel
  • Custom-Wound, Large-Core CineMag USA Transformers
  • Premium (2X) 12AX7 & (1X) 12AU7 Vacuum Tubes
  • 600Ω Output Attenuator
  • Engage High Gain Control For An Added 20db (From 70db To 90db) Of Clean Gain For Low-Output Mics And Low-Volume Sources
  • 48v Phantom Power & Polarity Switch
  • Classic Warm Audio Tone Control That Alters The Input Transformer Impedance Adding Extra Analog Color
  • 80Hz High-Pass Filter To Control Unruly Bass Frequencies
  • 2kHz Low-Pass Filter To Focus Preamp Power & Warmth On Mids For Added Punch
  • VU Meter Level Indication
  • Aluminum Faceplate, Steel Chassis, & Vintage Bakelite-Style Knobs

Warm Audio WA-MPX Tube Preamp Specifications

  • Mic Input: 600Ω Transformer (6000Ω Rated)
  • Inputs: XLR Mic, TS Instrument & TRS Line.
  • Outputs: XLR / TRS Line Level
  • Frequency Response: 20Hz-20kHz
  • Power: Internal IEC 115v/230v Power Inlet

Warm Audio WA-MPX Tube Preamp Includes

  • Warm Audio WA-MPX Tube Preamp
  • Power Cable
  • Manufacturer Warranty

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What We Think

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The Warm Audio WA-MPX is way more than just a microphone preamp — it’s a full-on studio mojo box. While using it in the studio, it quickly became clear how flexible this unit really is. It can serve as a mic preamp, an instrument DI, or a line-level processor, and once you start exploring its controls, you realize it’s built to create tone, not just pass signal. We’ve had a lot of fun pushing the WA-MPX across different applications. It can stay open and hi-fi when you want clean detail, or you can lean into the tubes for punchy, compressed character. And if the track calls for it? Push it harder and it’ll happily head into gritty, harmonically rich distortion territory. Whether you’re tracking, reprocessing stems, or adding attitude to something that already exists, the WA-MPX makes it easy — and musical — to find the right flavor. Warm Audio really did something special with this box. It’s inspiring, versatile, and one of those pieces that keeps you reaching for it just to see what else it can do.

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