Warm Audio TB12 Tone Beast Microphone Preamplifier

SKU: WATB12 MFR: TB12-B
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Key Features

  • Achieve pristine sound quality with this studio-grade microphone preamplifier.
  • Explore versatile tone shaping with selectable steel or nickel CineMag transformers.
  • Dial in the perfect gain range with up to 71dB of clean, powerful amplification.
  • Customize your tone using swappable op amps for unique sonic textures.
  • Optimize impedance options (150/600 Ohms) for mics, instruments, and more.
  • Enjoy low noise operation thanks to the external 24V AC power transformer.
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Special Order?Estimated to Ship: 09/09/2025
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Warm Audio TB12 Specifications

  • Type

    Discrete 312 preamp design with coupled CineMag Transformers

  • Input

    Front-panel XLR microphone input
    Front-panel 1/4" (6.3 mm) Hi-Z instrument input
    Rear-panel XLR microphone input
    Rear-panel 1/4" (6.3 mm) TRS line input

  • Output

    Rear-panel balanced XLR line output
    Rear-panel balanced 1/4" (6.3 mm) TRS line output

  • Gain

    71dB

  • Transformer

    Selectable steel or 50% nickel CineMag output transformers
    Selectable transformer bypass

  • Op Amp

    Selectable between 1731 and 918 style; socketed and swappable with your choice of 2520 6-pin footprint op amps

  • Impedance

    Input Impedance: switchable between 150 and 600Ohms (labeled "Tone" on front-panel)

  • Capacitors

    Switchable between Tantalum and Electrolytic for different characters

  • High-Pass Filter

    80Hz

  • Polarity Reverse

    Yes

  • Phantom Power

    +48 V

  • Output Attenuation

    Yes; allows for saturation flexibility of both the op amps and transformers

  • Insert

    0.25" / 6.35mm insert send
    0.25" / 6.35mm insert receive

  • Pad

    20dB

  • VU Meter

    LED

  • Power

    External line-lump 24 V AC power transformer for low noise

  • UPC Code

    860001767902

About Warm Audio TB12

The Tone Beast is a great mic pre with loads of gain that can effortlessly capture an array of sources very well. With top notch CineMag transformers and multiple discrete signal paths, it's hard to beat its big, bold, fully-professional sound at its price.

The Tone Beast is a mic pre that likes to be pushed and when pushed will colorize your signal ever so sweetly. The 2 opamps and 2 output transformers at the flip of their switches won't appear to be much different, but as one drives the pre into harmonic distortion, the unique character of each of these components becomes apparent. Additionally the Tone Beast is customizable and allows for other opamps to be sourced and easily swapped into the unit. I've pulled my best tones from this pre right at the saturation point (as loud as I can push the gain before clipping). The output control on the TB12 allows you to limit the signal exiting the preamp even when pushing the gain to really hot levels, giving you maximum control.

The x731 (Melcor 1731) and x18 (Dean Jensen's 918) Op Amps saturate a bit differently. The 1731 breaks up faster and has more color when pushed. The 918 is fairly linear/clean with a smidge of character and does not break-up/saturate as quickly. The 100% steel output transformer colors the signal more than the 50% nickel transformer when pushed. However, both are designed to impart character. The 50% nickel transformer will impart less character and provide greater high and low frequencies. For an ultra clean, character-lacking tone, try the x18 while bypassing the output transformers completely.

Have no fear of hurting the Beast, you can push it very hard into full-on distortions if you wish and these can sound quite nice on electric guitar, bass or anything else that likes some nice grit. When hand building mic pres I learned a bit about the "subtle" differences component choices can make. A little change here and another there often times became a huge deal in a finished mix, but often times is not very noticeable at first take. The different component options in the TB12 are subtle, but when driven into saturation are noticeable and can make a big difference to the way your final mix will sound. Home-based musicians and professional studios alike will find the Tone Beast to be an extremely powerful and fully professional piece of gear that is capable of warming and shaping signals/mixes in a way that is very pleasing to the ear.

Warm Audio TB12 Features

  • Utilizes premium grade input and output
  • 71db of gain
  • Transformer selection provides both Steel and 50% Nickel CineMag output transformers for varying character
  • Transformer bypass switch allows for removal of the output transformer from the circuit
  • Discrete Opamp selection provides both the classic 1731(vintage) and 918(cleaner) style opamps. These are socketed/swappable with your choice of 2520 6 pin footprint opamps
  • Impedance switch labeled TONE to switch between 150 and 600 ohms input impedance
  • Capacitor selection between Tantalum and Electrolytic for different characters
  • 80hz hipass filter
  • Polarity Reverse
  • Output attenuation allowing for saturation flexibility of both the opamps and transformers
  • 1/4" insert for the use of inline compressors, eq's etc
  • Balanced XLR mic (front and back), balanced TRS line and1/4" instrument inputs
  • Balanced XLR and TRS outputs
  • External line-lump 24V AC power transformer for low noise
  • LED VU Meter

Product Documents

User Manual

Key Features

  • Achieve pristine sound quality with this studio-grade microphone preamplifier.
  • Explore versatile tone shaping with selectable steel or nickel CineMag transformers.
  • Dial in the perfect gain range with up to 71dB of clean, powerful amplification.
  • Customize your tone using swappable op amps for unique sonic textures.
  • Optimize impedance options (150/600 Ohms) for mics, instruments, and more.
  • Enjoy low noise operation thanks to the external 24V AC power transformer.

What's in the box:

  • Warm Audio TB12 Tone Beast Microphone Preamplifier
  • 24 VAC Power Transformer
  • Warm Audio 1 Year Limited Warranty