This eighth of 10 blocks of student and teacher materials for a secondary/postsecondary level course in electronic principles comprises one of a number of military-developed curriculum packages selected for adaptation to vocational instruction and curriculum development in a civilian setting. Prerequisites are the previous blocks. This block on principles and applications of electron tubes contains seven modules covering 39 hours of instruction on electron tube characteristics and diodes (4 hours); triodes (7); multigrid electron tubes (4); special purpose electron tubes (5); electron tube audio amplifiers (5); electron tube RF amplifiers, cathode follows, DC amplifiers and triode limiters (5); and thyratron sawtooth generator, phantastron, and electron tube series voltage regulator (9). Printed instructor materials include a plan of instruction detailing the units of instruction, duration of the lessons, criterion objectives, and support materials needed. Student materials include a student text and seven guidance packages containing objectives, assignments, review exercises, and answers for each module. A digest of the modules in the block is provided for students who need only to review the material. Designed for self- or group-paced instruction, the material can be adapted for individualized instruction. Additional print and audiovisual materials are recommended but not provided. (YLB)