Warm Audio TB12 Tone Beast Tone Shaping Mic Preamp - Box Opened

£559.00 RRP £579.00 (including VAT @ 20%)

This product is currently not available for purchase

  • Discrete 312 Preamp Design
  • Steel and Nickel CineMag Output Transformers
  • Classic 1731 and 918 Style Opamps
  • Capacitor Selection Provides Different Characters
  • XLR, TRS and 1/4'' Inputs with XLR and TRS Outputs

Warm Audio TB12 Tone Beast Tone Shaping Mic Preamp - Box Opened


The Warm Audio Tone Beast is an incredible mic preamp that has plenty of gain to offer, effortlessly capturing an array of sources incredibly well. The TB12 Tone Beast provides you with the ability to select different transformers, opamps and capacitors as well as enjoying a wide range of tones in the process. When you really push the Tone Beast, you'll find harmonic distortion that's perfect for electric guitars, bass and anything that needs some grit. Or, use the bypass function and the TB12 will deliver incredible, ultra-clean tones.

Please note, the box has been opened as part of our quality control inspections and as such all the seals have been broken. The item itself is brand new and has never been used.

This is a great opportunity to buy a fully functioning product at a discounted price, supplied with a one year warranty.

Product Ref: 94054

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History Behind the Tone Beast

In the 60's and 70's many console/preamplifier builders hid the operational amplifier (opamp) of their preamps by cramming the components into a small box and then attaching the box to the circuit board. Inside these small boxes, the components were covered in glue to make them hard to disassemble/analyze. Manufacturers felt the character of these opamps was unique enough to protect.

The TB12 Tone Beast utilises this same square shaped opamp and pin configuration as the originals but without the plastic and glue housing. The TB12 is designed so that the stock opamp can be removed and replaced with whatever takes your fancy, allowing you to tweak and customise your sound as much, or as little as you like.

Multiple Discrete Signal Paths with Unprecedented Flexibility

By combining different mics with different preamps, you can make every source sound its absolute very best. First of all, you have the choice of a 1731 or 918 opamp; The 1731 is extremely coloured and break up quickly, while the 918 is fairly clean with a touch of character. Secondly, you have the choice of a 100% steel or 50% nickel transformer; The steel output transformer is more coloured than the nickel, especially when pushed. For even more tonal variety, the Tone Beast is provides you with the choice of tantalum and electrolytic capacitors.


  • Discrete 312 preamp design
  • CineMag input and output transformers
  • Provides 71dB of gain
  • Transformer selection delivers 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
  • Socketed/swappable with your choice of 2520 6-pin footprint opamps
  • Impedance switch labeled TONE, switches between 150 and 600 ohms input impedance
  • Capacitor selection between Tantalum and Electrolytic for different characters
  • 80Hz hipass filter
  • Polarity reverse
  • +48 V phantom power
  • Output attenuation allows for saturation flexibility of both the opamps and transformers
  • 1/4'' insert for use of inline compressors, EQ's etc
  • Balanced XLR mic (front and back), balanced TRS line and 1/4'' instrument inputs
  • Balanced XLR and TRS outputs
  • -20dB Pad
  • LED VU meter
  • 19'' rackmountable
  • External line-lump 24V AC power transformer for low noise