RCA Radiotron Manual - R10
Cathode-Ray Oscilloscopes - Charles Sicuranza - 1938
Electronic Circuits and Tubes - Cruft Labs -1947
Basic Radio - The Essentials of Electron Tubes and Their Circuits - J. Barton Hoag - 1942
Know Your Oscilloscope - Paul C. Smith - 1958
Amplifier Builders Guide - Hugo Gernsback - 1964
Oscilloscope Techniques - Alfred Haas - 1958