Here comes the list of web sites that have manuals.
http://www.agtannenbaum.com/catalog.html
(lots of test equipment)
http://www.manualman.com
(lots of test equipment)
http://www.manualsplus.com
(lots of test equipment)
http://www.hi-manuals.com
(lots of test equipment)
http://w7fg.com
(lots of test equipment)
http://www.falls.igs.net/~testequipment/manuals.html
(the one above RENTS manuals so you can copy and return; lots of test equipment)
http://www.treasurechestcorp.com
(consumer electronics)
http://www.acadia.net/guest/michelle
(consumer electronics)
http://www.sarrio.com/sarrio/rsfinal1.html
(variety of types)
http://www.tiac.net/users/mgasman
(audio-visual equipment)
http://bama.sbc.edu
(vintage downloads; good variety)
http://www.nostalgiaair.org/NostalgiaAir/schematics/tei
(vintage downloads; good variety -- this web site)
http://www.vacuumtube.com/schemati.htm
(vintage hi-fi)
http://www.vacuumtubes.com/manuals.html
(tube testers)
http://www.columbiaelectronics.com/index.htm
(military communications)
http://www.one-electron.com/filing_cab.html
(limited specific links to schematics)
Dean