Description

Thin softbound pamphlet, staple bound in light gray wrappers lettered in black. 39 pages. Contents include: Key to Symbols and Abbreviations; Radio Tube Characteristics Chart; Special Purpose Tube Data; Flat Hearing Aid Tube Data; Radio Panel Lamp Data; Tube Outline Drawings; Tube Symbols and Base Diagrams; Definition of Tube Terms; Interpretation of Tube Ratings and Western Electric Data, No publication history, presumed first (only?) printing. No previous ownership marks. A pristine, as new copy.