The Collector's Vacuum Tube Handbook: The Non-Rma Numbered Receiving Tubes (1)

This book contains hard to find electrical data for nearly 200 tube types that pre-date the RMA standardized numbering system, initiated in 1934. It includes basing diagrams, photos of tubes and brief developmental histories of each. Includes tubes by Western Electric, DeForest, Arcturus, Cunningham, GE, Ken-Rad, Philco, Speed, Sparton,Cardon, Daven, McCullough and others.