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Warm Audio TB12 Tone Beast Microphone Preamp - Black

Mic/Instrument Preamp with Variable Character, 71dB of Gain, CineMag Transformers, Discrete Op-amp Section, Selectable Capacitors, Variable Impedance, and Highpass Filter - Black
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Item ID: TB12Blk
Warm Audio TB12 Tone Beast Microphone Preamp - Black
Price:$699 and 00 cents
Special Financing - Ends Aug 2, 2026. $20/month with 36 month financing*

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Warm Audio TB12 Tone Beast Microphone Preamp - Black
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Price:$699 and 00 cents
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This article was Written By

Our Product Research Team

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A Wild Beast of a Preamp!

Tweaking the Warm Audio TB12 Tone Beast preamp is addictive — at Sweetwater, we can't get enough of it! Based on the API 312 preamp's design and sporting premium CineMag transformers, the Tone Beast is already a stellar mic pre. The Tone Beast's real magic, however, lies in its multiple discrete signal paths. With the flip of a switch, you can select different transformers, op-amps, and capacitors and enjoy myriad tones in the process. Push the Tone Beast and enjoy the harmonic distortion it lends to electric guitars, bass, or anything else that needs some grit. Big, bold, and fully professional, you won't find many preamps like the Warm Audio TB12 Tone Beast for under a grand!

Multiple discrete signal paths provide unprecedented flexibility

Experienced recording engineers love how different mic preamps color their sound. They know that by combining different mics with different preamps, they can make every source sound its absolute best. With the TB12 Tone Beast in your rack, you'll be able to do the same, thanks to its unprecedented versatility. The Tone Beast's flexibility is staggering. First, you can choose a Melcor 1731 or Jensen 918 op-amp. The 1731 is very colored and breaks up quickly, while the 918 is fairly clean with just a hint of character. Second, you can choose a 100% steel or 50% nickel transformer. The steel output transformer is more colored than the nickel transformer, especially when pushed. You can also bypass the transformers completely for an ultra-clean tone. Finally, you can choose tantalum and electrolytic capacitors for even more tonal variety.

Coloration — and why you want it

The most coveted vintage consoles and outboard gear weren't transparent. And that's the point behind the Warm Audio Tone Beast. Coloration is, in many cases, desirable. If your mixes sound unprofessional and lacking in vibrancy and depth, you'll love the Tone Beast. Subjective listening tests played a big part in the development of this amazing preamp. Test equipment can tell you only so much, and there's a point in the design process where you just have to let your ears call the shots. You wouldn't mix with earplugs and an oscilloscope, would you?

Top-tier performance and amazing value

At Sweetwater, we understand that outfitting your studio is a balancing act between performance and value. Warm Audio gets that, too, and the Tone Beast delivers on both counts. Warm Audio gear is made in the USA and uses only the finest components, such as genuine CineMag input and output transformers. Look at it this way: at this price, you can pack your rack with two or more Tone Beast preamps — perfect for recording live drums or more than one track at a time.

Warm Audio TB12 Tone Beast Features:

  • Discrete 312 preamp design with CineMag transformers delivers stellar tone
  • Choice of Melcor or Jensen op-amps for varying character
  • Op-amps are socketed/swappable — add your own op-amps to the mix!
  • Choice of steel or nickel output transformers for more tonal options
  • Choice of tantalum or electrolytic capacitors for even more character variation
  • Transformer bypass switch provides an ultra-clean character
  • Tone switch allows for variable mic impedance
  • 80Hz highpass filter cuts the mud and rumble
  • 20dB pad tames really loud sources
  • Output attenuation for saturation flexibility of both op-amps and transformers
  • Insert allows the use of in-line processors
  • LED VU meter lets you monitor your levels

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Tech Specs

  • Preamp Type: Solid State
  • Number of Channels: 1
  • Phantom Power: Yes
  • Pads: -20dB
  • Polarity Switch: Yes
  • EQ: 80Hz Highpass Filter
  • Analog Inputs: 2 x XLR (mic), 1 x 1/4" TRS (Hi-Z), 1 x 1/4" (line in), 1 x 1/4" TS (receive)
  • Analog Outputs: 1 x XLR, 1 x 1/4" TRS, 1 x 1/4" TS (send)
  • Channel Inserts: Yes
  • Rack Spaces: 1U
  • Power Source: Standard IEC AC cable
  • Height: 1.75"
  • Width: 19"
  • Manufacturer Part Number: TB12-B

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Reviews

The Name Doesn't Lie
The TB12 is AMAZING!!! I've been using it on guitar and vocals, and it's a main part of my front end when recording.
Music background: Composer, Producer, Multi-Instrumentalist
It truly is a beast!
I really have mixed mostly in the box the past few years and recently picked up a few Warm Audio items.I would say the tone difference as far as warmth and harmonics in this thing are drastic even at minimal settings. The first thing I tried was my guitar and It has never sounded nearly as rich and warm as it did through the tonebeast!
I love it on bass guitar and vocals as well.
Even with the low output SM7 b mic it just has more than enough gain to get the job done and still overdrive the output to get that warm saturated sound. So far I have the TB-12 two of the EQ's and a WA-76 compressor and I am totally sold on Warm Audio.It all looks really cool in the new Argosy console my son bought for me. :)
Beauty and the beast all in one.
The Tone Beast Black, is based on the classic API 312 preamp, yet it offers a variety of tone-shaping options at a price that is almost hard to believe. especially considering it houses 3 high-quality Cinemag transformers and a fully discrete Class-A signal path. If you are in the market for a great sounding, versatile yet affordable preamp you should consider the Tone Beast Black, The magic happens when you drive the circuits to distortion. The way they break up is what makes this a great addition to my studio. It really gives you a lot of colors to paint with.
Music background: Singer/songwriter Performer and studio owner
The sound I was missing
I've been running the Warm Audio TB12 Tone Beast into my WA76, and that combo has completely changed how I track.

The TB12 isn't just a preamp, it's a tone shaper in the best way. The op-amp options, CineMag transformers, and impedance switching actually matter. I can dial in something tight and punchy or push it into a thicker, more saturated character depending on what the track needs. It feels like I'm choosing the sound at the source instead of fixing it later.

Then hitting the 1176-style compressor right after? That's where everything locks in. Fast, aggressive control when I want it, or just a bit of glue to keep things sitting right. It reacts exactly how I expect from a FET comp, especially on vocals and bass. It adds energy without killing the dynamics.

Vocals come through forward and controlled without sounding choked. Bass and synths get that perfect balance of weight and edge. Even guitars feel more alive going through this chain. It's one of those setups where you commit on the way in and don't regret it later.

What I really appreciate is how musical both units are together. Nothing feels sterile. It's all character, but still controlled. I spend less time stacking plugins and more time actually creating.

For the price, this chain punches way beyond what you'd expect. It doesn't feel like a compromise, it feels like a deliberate choice.

This setup didn't just improve my recordings, it changed how I approach making music.
Fun to use!
I don't have a ton of experience with pre amps and to be honest this was my first purchase for my own studio, but very impressed with what this does. It's very clean, but I love the versatility and all the options. Makes the recording experience fun, because I can flip a switch or turn a knob and get a different coloration. This can work for a variety of sources and I think has a lot of bang for the buck.
Music background: Have played drums for 16 years, live sound production for 8 years and recording engineer for a collective 2 years.