Warm Audio

Warm Audio TB12 Tone Beast Microphone Preamplifier (Black) 323649 860001767902

$ 649.00

Warm Audio TB12 Tone Beast Microphone Preamplifier (Black) 323649 860001767902

$ 649.00
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  • SKU: WTB12B323649
  • Brand: Warm Audio
  • Type: Recording Devices
  • Availability: In Stock

Key Features:

  • Mic, Instrument & Line Inputs
  • Up to 71 dB of Gain
  • Output Gain Attenuator
  • Switchable Discrete Op-Amp
  • Switchable Input Impedance
  • Switchable Output Transformer
  • Switchable Capacitor
  • 48V, Polarity Switch, 20 dB Pad

The black, single-channel Warm Audio TB12 Tone Beast Microphone Preamplifier is designed to provide a wide range of tonal options for mic, instrument, and line-level sources, making it an indispensable tool for audio engineers, producers, and muscians. The TB12 is capable of up to 71 dB of input gain, and employs an output attenuator allowing you to drive your input signal harder for color and saturation while keeping your signal from peaking.

The TB12 Tone Beast lives up to its name by allowing you to select between two different discrete op-amps, two different output transformers that can be bypassed altogether, two input impedance settings for dynamic, condenser, or ribbon mic optimization, and two different capacitors. The preamp is capable of producing colored, vintage-style tones with early break up and clean, transparent modern tones. Thanks to its front-panel Hi-Z instrument input, the preamp can be used to record DI tracks, while the rear-panel 1/4" line input allows you to use the TB12 to provide color or warm up previously recorded tracks.

The rear-panel insert send and receive 1/4" connectors let you integrate an external signal processor, such as an EQ or compressor, into the TB12's signal flow before the output transformers. The unit features 48V phantom power, a high-pass filter at 80 Hz, a 20 dB pad, and a polarity reverse switch.

Op-Amps Switch

Choose between 2 completely different discrete analog operational amplifiers. One of the op-amps is built to the schematic of the classic 1731 style op amp, using a Melcor 1731; the other is built to the schematic of the 918, employing Dean Jensen's 918. The 1731 has a more noticeable vintage tone, breaking up faster and providing a more colored sound. The 918 is more linear/transparent, and does not break up as quickly. Both op-amps are socketed and use the classic 2520 6-pin footprint. This allows users to remove the op-amps easily (without soldering), and replace them with their own op-amps of choice.

Output Transformer Switch

Switch between 2 CineMag output transformers of different tone/make. The 100% steel core transformer sounds more vintage with a mid-forward tone. The 50% nickel core transformer has a cleaner tone than the steel, providing more highs and lows, and was custom designed by CineMag specifically for the Tone Beast.
The nickel version uses a laminating method that gives the signal a more linear response than the steel option, but still treats the signal slightly, giving your signal a smoothness. The Output Transformer Bypass Switch removes both the nickel and steel transformers from your output signal and provides a transparent tone. Bypassing the output transformers will result in an 8 dB drop in level.

Tone Switch

The 150-ohm (switched-in) setting increases the gain of the Tone Beast by +6 dB changing the maximum gain from +65 to +71 dB. This feature will make a noticeable tone change to most microphones and instruments. The microphone, line, and Hi-Z inputs are all altered by this feature. The 600-ohm impedance setting is recommended for condenser and dynamic microphones, and 150 ohms is recommended for ribbons. This switch is labeled Tone for a reason though, to experiment with both settings on all sources to find the best possible tone for your mixes.

Capacitor Switch

Change capacitors in the circuit from Tantalum to Electrolytic. The vintage setting is for tantalum capacitors, the clean setting is for electrolytic. Of all the tone features provided in the Tone Beast, this option is the most subtle but is noticeable to many ears depending on the source being treated.


  • Type: Discrete 312 Preamp Design with Coupled CineMag Transformers
  • Input: 1 x Front-Panel XLR Microphone Input, 1 x Front-Panel 1/4" / 6.35 mm Hi-Z Instrument Input, 1 x Rear-Panel XLR Microphone Input, 1 x Rear-Panel 1/4" / 6.35 mm TRS Line Input
  • Output: 1 x Rear-Panel Balanced XLR Line Putput, 1 x Rear-Panel Balanced 1/4" / 6.35 mm TRS Line Output
  • Gain: 71 dB
  • 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 600 Ohms (Labeled "Tone" on Front-Panel)
  • Capacitors: Switchable between Tantalum and Electrolytic for Different Characters
  • High-Pass Filter: 80 Hz
  • Polarity Reverse: Yes
  • Phantom Power: +48 V
  • Output Attenuation: Yes; Allows for Saturation Flexibility of Both the Op Amps and Transformers
  • Insert: 1 x 1/4" / 6.35 mm Insert Send. 1 x 1/4" / 6.35 mm Insert Receive
  • Pad: 20 dB
  • VU Meter: LED
  • Rack Units: 1 RU
  • Power: External Line-Lump 24 VAC Power Transformer for Low Noise
  • Dimensions: 19 x 1.75" / 482.60 x 44.45 mm
  • Depth: Not Specified by Manufacturer
  • Weight: Not Specified by Manufacturer
  • Package Weight: 8.675 lb
  • Box Dimensions (LxWxH): 24.5 x 9.5 x 3.9"

In the Box

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

MPN: 323649

UPC: 860001767902

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