From the days when every middle-class home had a radio for family entertainment and for the latest news! This catalog showcased many models of AM and short-wave radios, phonographs, test equipment -- and components for assembling your own (from designs in books and magazines). It covered the vacuum tubes necessary to keep them all running, along with many other parts to modify or repair them. This catalog was also a great source of parts for two-way amateur ("ham") radio operators. 

Many of these catalogs were distributed, but few are in much better condition than this one!