The Mark 3 mixer is intended to look and operate very much like a modern solid state console, except it has tubes under the hood. In fact, unlike most so called 'tube mixers' on the market today, it has zero semiconductors in the signal path. It has been under development for several years and it is still not finished, but many of the techniques developed for it have been incorporated in other designs, notably the Poor Man's Tube Mixer and the Compact Recording Console. More details will follow as they become available.