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Kerwax Replica Dual-Channel Tube Preamplifier

Handmade dual-channel tube line preamplifier in 5U rack spaces with four 12AX7 valves, Baxandall EQ, and bias and trim controls

MFR# Replica

Product Description

The Kerwax Replica is a dual-channel, rack-mount version of the 24-channel custom tube mixer installed at Kerwax recording studio, a unique mixing desk conceived in the pure tradition of historical studios to meet the requirements of in-house sound engineers and producers. Its two independent channels are ideal for stem or individual instrument processing.

The Kerwax Replica creates a wide variety of tube harmonic distortion characteristics, from gentle enhancement to smashing blast, with an easy tweaking combination of gain drive and output volume stages, bias adjustment, and EQ knobs. It is the ideal companion as an insert or a front-end unit for processing and warming up your stems or mix.

This high-end tube line preamplifier has been designed at Kerwax Recording Studio, a residential facility located in Brittany, France. Its unique design features easy change and combination of tubes, to sculpt and color the sound artistically, with both vintage and modern tubes. The controls interact with each other to create a wide variety of tube harmonic distortion characteristics. Built with the best materials and audio components, at the Kerwax Replica is a window to the golden age of recording studios.


The Kerwax Replica uses two vacuum tubes per channel: one for preampfification and equalization, and on for the Volume/Gain stage. 12AX7 tubes are used for their optimal results with a wide variety of audio sources. However, if you want to experiment and obtain different results, the tubes are replaceable. You can use all reference from the 12AX7 family.


Now, you can build your distinct sound, and stand out, You can easily warm-up and add distortion to any input audio signal use Trim and Bias settings to adjust depth and produce harmonics. Select Drive function with Gain setting to add progressive saturation to the sound. Thanks to its gentle Baxandall-type curves, the integrated treble and bass EQs are very musical and smooth. In case you need to remove some harmful low frequencies, a high-pass filter allows you choose between 80 Hz and 120 Hz frequencies. The possibilities are endless: experiment and enjoy!


  • Two audio modes: Left/Right and Mid/Side
  • Two tubes per channel (preamp and drive)
  • Tube preamp BIAS adjustment
  • Gain/volume adjustment for harmonic distortion
  • Trim adjustment
  • Treble and bass EQ adjustment
  • Selectable high-pass filter
  • Individual channel phase switch
  • Output level monitoring on VU meters

Product Specifications

Tube or Solid StateTube
Chassis19-inch Rack-mount
Rack Spaces5u
Input ConnectorsAnalog XLR
Output ConnectorsAnalog XLR
Tube Complement12AX7

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In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
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The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
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