By Robert T. Millard The Collector's Vacuum Tube Handbook contains hard-to-find electrical data on nearly 200 tube types that pre-date the RMA (Radio Manufacturers Association) standardized numbering system, which was initiated in 1934. It includes basing diagrams, photos of tubes and boxes, and brief developemental histories of each. Western Electric, DeForest, Arcturus, Cunningham, GE, Westinghouse, Philco, Speed, Ken-Rad, Sparton, Cardon, Daven, McCullough and others are among brands covered. ISBN 1-886606-15-3 (205 pages, 7 X 10" softcover) $25.95 SONORAN PUBLISHING - Email: snrnpub@aol.com PHONE (480) 747-8568