"This month’s edition also features two excellent DIY projects, starting with the conclusion of the DIM—A Device for Interfacing and Measuring with a Sound Card by George Ntanavaras, which we started publishing in our Test and Measurement edition in March 2017. The second project comes from Gerhard Haas, detailing how to build a high-quality 6C33 Push Pull Amplifier. Two top notch and rewarding DIY projects from top audio experts".