Technical literature

1962 Tube caddy-tube substitution guidebook, by H. A. Middleton, is a revised and enlarged version of the original edition. This guide, designed for a TV technician´s tube caddy, lists more than 4,000 direct substitutions for commonly used tubes. The four sections in the first edition, covering Receiving Tubes, European to American, American to European, and Ruggedized Tube Substitutions, have all been expanded and brought up to date, and a fifth section listing 1,300 picture tube substitutions has been added. The 64-page guidebook is priced at $.90 from John F. Rider Publisher, Inc., 116 W. 14 St., New York 11, N.Y.