Well, they are suppose to be green! For some reason, during the development process of these boards, someone must have chosen the wrong colour!
These boards are going through final stages of tests and will be available rather soon.
The amplification is done two 12AX7 valves per channel. One being dedicated for the phono stage (with passive RIAA equalization) and another one for managing a line-level pre-amp duty. Output impedance is set to 100KOhm.
Watch this space!