John Rider made tons and tons of schematics available - Sort of like "Sam's Photofacts" if you're familiar with those. You can buy Rider CD's that have collections of thousands of schematics. They are made available as collections that span a few years. Volumes 1-4 is on the first CD which has schematics for radios made between 1926 and 1934. Volumes 5-8 are for 1934-37, Volumes 9-12 are for 1937-1941, Volumes 13-16 for 1941-1947, Volumes 17-20 are for 1947-1950 and Volumes 21-23 are for 1950-1953. There are something like 35,000 schematics in the collection.There are lots of good books, so this isn't the only thing out there - That's for sure. I have the Rider collection Volumes 1-16, so I'm familar with them. They've been helpful, especially when buying new radios since I usually already have service information on hand. But there are lots of other good books out there, and you can really spend a lot of time going over them all. It's very enjoyable, and easy to get caught up in. I especially like to look at the parts lists, particularly when prices are shown. You'll find things like a replacement cabinet made of hand-crafted real walnut for an RCA Victor at $3.25 each.