Peter Dieleman is now 71 years of age, retired but still active every day, consulting for the Dutch Government. During the past 10 years he has become a specialist on IT structures for safety, management, and exploitation of tunnels. At age 17, he went to study electric engineering (‘Electrotechniek’) at Delft Technical University in the Netherlands. He then earned his living as a television repair man (tubes in those days). At age 30, he gradually switched to digital electronics because television sets got better and there was less need for repairmen. He was a Lecturer at Groningen and Twente universities in the Netherlands for about 25 years. And, he has always kept his love for tubes alive. In 2003, he wrote his first book on the theory and practice of tube amplifiers. In 2009, he finished his second book on tube designs like SRPPs, mu-followers, and OTLs. The first books were translated into German and French; the second one into German.