American TV was based in Chicago and reportedly manufactured sets for private rebranding in addition to those sold under the names American and DeForest (as in Lee, who understood by this time that high vacuum in a tube was a good thing). It must have been company policy to use whatever parts were onhand on any given day, as the printed tube location chart lists multiple possibilities for some sockets, while the designations for other sockets were crossed out and the substitutions written by hand. It's still not correct...for example, no handwritten correction was made where the tube chart indicates there should be a 6AV5 horizontal out: the tube in this set is a 6BG6. On the plus side it's very solidly built and even features an auxiliary phono input complete with extra AC outlet.
