Some form of vacuum tube tester is a necessity in every radio laboratory. The vacuum tube tester herewith described is the result of an effort to design a simple instrument suitable for routine work, and which could be left permanently connected to the lighting circuit thus being always ready for use.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Helmick, P. S.
"A Vacuum Tube Tester for Routine Work Using Alternating Current,"
Proceedings of the Iowa Academy of Science, 33(1), 244-246.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/64