Documents and data from Hytron Radio and Electronics Corp.
Making Tubes is Easy... If You Know How! - From 1946 to 1948, Hytron ran a series of advertisements in magazines such as Electronics, Radio & Television Retailing, and QST outlining in detail the various aspects of vacuum tube manufacturing. While not all aspects of tube making are covered (e.g. exhaust details, material sourcing), these give a good idea of the complexities of tube manufacturing.
These pages were extracted from americanradiohistory.com scans. Since these are highly compressed, the image quality is not up to my standards, but are useable.