[mikethedruid]

Yup. for the sets before that radio repair men used the Rider Manuals. They were published from 1930 to 1954. The first edition included the schematics and information for most of the commercially made sets up to that time. The subsequent editions had the service information on all the commercially produced sets in the U.S. in the years subsequent. You can get DVDs with good scans of the COMPLETE manuals these days on sites like YouTube. They are not expensive, and I STRONGLY suggest the purchase for anyone serious about the antique radio hobby. When you want to work on a set, you can then print out just the pages you need.