AMradios.com(site info)
Antique and replica tube radios from 1920s to the 1950s, and schematic service. They also offer a selection of vintage clocks, fans, and telephones.
http://www.AMradios.com/
Phil's Antique Radios(site info)
Printed copies of schematics and service manuals for classic radios and stereo equipment from the 1920s to 1960s, from sources including Rider's, Beitman's, and Sam's Photofacts. Has links to other sites related to service data.
http://www.antiqueradioschematics.com/