Author Description

The manual opens with RCA's summary of tube fundamentals, covering the first 29 pages, with clear illustrations of tube actions. A spread of photos of tube manufacture follows, with the next 100 pages given to individual tube performance data. The final 16 pages cover tube testing, suggested circuits including 9 receivers, four audio amps and a microphone preamp. Operating conditions for resistance coupled A-F amplifiers is summarized in a table and tube bulb profiles are supplied. A two-page index completes the book.This manual RC-12 is an early historical snapshot of the growing tube technology in the United Sates, and a useful guide to the very early tubes which it details. It is especially useful to those who are restorers of antique equipment and a useful look at one period of thermionic valve development for any tube enthusiast.