Links

Grundig
Grundig Radio Boy (en) (1947 Hits) (Lots of information about Grundig world receivers)
Grundig Satellit Warehouse (en) (2801 Hits) (Manuals and Schematics for Grundig Satellit radios)

Other receivers
Nostalgische Radios (de) (2009 Hits) (Very nice page about tube- and transistor radios with lots of images, descriptions, circuit diagrams and other documents.)
RadioMuseum.org (de) (en) (1951 Hits) (Very large site about vintage radios)
Technisat/Sangean ATS909 Kurzwellenempfänger (de) (1983 Hits) (Information about the ATS909)

Tests and articles of receivers
Martin's Radio Pages (de) (1915 Hits) (Lots of top quality tests about shortwave receivers.)
Modern Shortwave Receiver Survey (en) (2044 Hits) (One of the most extensive receivers lists online)
Radio Netherlands Receiver Survey (en) (1459 Hits) (Tests of all current and some discontinued world receivers)
Welchen Empfänger brauchen Sie? (en) (1542 Hits) (Tips about sw receivers from the team of the HJCB Quite, the Voice of the Andes)