Profile: Thermionic Culture Ltd. focuses on producing the valve design audio products. We provide mastering valve compressors. The unit has a red faceplate and a combination of switched and stepped controls as well as an internal side chain filter. Units are currently in production and the run is limited to 99 units. We have developed 16 channel valve summing mixer. It is designed to complement the Fat Bustard valve summing mixer by increasing the number of inputs channels.