This page provides limited access to manuals and support information for older HP, Agilent and Keysight test and measurement equipment. There are multiple sources for radio manuals / radio instruction books, electronic test equipment manuals / electronic test equipment instruction books and radio schematics / test equipment schematics. Listed here you will find free downloads of schematics & parts lists, manuals, catalogs, and miscellaneous items for repairing and operating various antique radios, tube testers, and vintage test equipment. You will find more complete information, including any available manuals, by reviewing the Discontinued Products area for the product family you' re interested in.