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http://www.tubebooks.org/technical_books_online.htm

A gift from nobody. Yes... That nobody. Thanks again for sharing the site link.

General Electrical Engineering Books and Textbooks (pre-1964)
Audio (hi-fi, amplifiers, speakers...)
Radio (transmitters, receivers, design, repair...)
Vacuum Tube theory & circuit design
Test & Measurement (equipment, instructions...)
Passive components (transformers, capacitors...)
Other (transistors, tape recorders, odd stuff...)

Edit: Be sure to download the right file. The name of the title links to a short preview of the book and is not the whole thing.