"The first half of the book is concerned primarily with the development of linear and picewise-linear circuit characterizations for tubes and transistors and with examining the behavior of these devices in the basic amplifier configurations; thus it is concerned with the properties of active devices and with circuit representations for such devices. The techniques employed are quite general and are used in a subsequent course to obtain circuit representations for mechanical, electromechanical, and hydrolic devices. The second half of the book is concerned almost solely with linear tube and transistor circuits; thus it is an introduction to active-circuit theory. This study is closely correlated with the study of passive-circuit theory; in fact, it is an extension of passive-circcuit theory to include active circuits. The methods employed in characterizing the active devices make it both feasible and desirable to treat tubes and transistors simultaniously. As implied above, these two devices are seen to be special cases of a large case of amplifying devices." - E. J. Angelo