Maybe someone who recognizes this set will jump in. Barring that, try using the following resources: you enter the number and types of tubes and the database returns a number of sets that it "might" be. You then track down the schematics of those on NostalgiaAir and the other sources until you hit one that looks right. It takes time and research. Sometimes if you don't hit one that's right on the money, you can print out several with that tube line up and compare to your set. With the same tube line up, such sets will usually be mostly the same.
http://www.grillecloth.com/sylvania/intro.php