look on ebay, they have lots of classic receivers and sometimes they can be had for a good price! You can look up your set on there as well, someone will be selling one for parts or working. Its your choice what to do. In some cases you can get another for less than searching for parts/repair.
http://shop.ebay.com/i.html?_from=R4...All-Categories
as of this minute, you got the choice, schematic, or replacement. They have two listings.