The newsgroup FAQ separated into several different pages, with topics ranging from vacuum tube design, to suppliers, tools and test equipment, cabinet restoration, and trouble-shooting tips. http://www.antiqueradio.org/radfaq.htm
Vintage radio restoration service, by Ron Ramirez Enterprises. Features a gallery of older Philco models, downloadable schematics, do-it-yourself servicing and tuning tips, identification and dating guide. http://www.philcoradio.com/
Database of schematics of Italian-made radios as recent as 1950, available in pdf format. Requires free registration. [English, Italian] http://www.schemiradiotv.com/
Provides service manuals, schematics, and reference material for technicians involved in restoring and maintaining sets built from 1921 to 1936. Also includes parts fabrication drawings and high-quality redrawn schematics. The Antenna section features ind http://www.atwaterkent.info/
Index of schematics and tube data sheets that he has available. Hints for the repair of several sets, including a Volksempfänger VE 301 GW. List of spare parts that he has plus a list of parts he's looking for. [English and German] http://home.arcor.de/walter.groer/index_e.htm
A description of the classic "All-American" five-tube superheterodyne AC/DC AM radio circuit used in the majority of consumer receivers made in North America, from the 1930s through to the '60s. Includes a tube substitution table and a typical s http://home.netcom.com/~wa2ise/radios/aa5h.html