The dynamoelectric amplifier-class a operation

Previous papers have described the basic operating principles of several dynamoelectric amplifiers and their behavior under d-c transient conditions. This paper compares the various dynamoelectric amplifiers to the electronic amplifier, and discusses the static and dynamic characteristics of both the single -and 2-stage dynamoelectric amplifiers from an a-c steady-state point of view. The dynamic characteristics are calculated from equivalent circuits and compared with test results in the form of frequency response and phase angle curves. Negative feed-back circuits and response curves also are presented and the effects of feedback pointed out. Methods of obtaining the equivalent circuit parameters from test are discussed briefly.