Tek Retiree Volunteer Program Quarterly newsletters and other Tek reference information.
Tek Wiki Information about classic Tektronix equipment.
Tektronix Resource Site Bill Den Beste and Stan Griffiths resource page, no longer updated.
Richard Sears, Vintage Electronics Vintage electronic test equipment, mostly scopes etc.
The Wellekino - A Home Of Old Scopes And Test Equipment German site of old scopes and test equipment.
Museum Of Broadcast Technology Audio control, television cameras, tape systems, and related production equipment.
Dr. Hugo Holden's Electronics Page A number of interesting articles on electronics with these PDFs related to Tektronix instruments.
Servicescopes October 1959 to September 1971 single 694 page PDF at archive.org.
Tektronix catalogs and more various PDFs at archive.org.
Sammlung Historische Messtechnik, Berlin German site with an extensive collection of Tektronix catalogs.
Oscilloscope Development, 1943-57 - Ryerson University by Peter D. Hiscocks (PDF).
The Cathode Ray Oscilloscope by J. Czech (PDF). This book was published in 1957 as part of the Philips' Technical Library.
You Should Meet Melville Eastham by Chuck House. Melville was the founder of General Radio and the article contains references and comparisons to Tektronix.
Op-Amp Applications Handbook by Walt Jung (PDF).
HP Origins A video story of Hewlett-Packard as told by HP employees over the years.