The following company is an excellent source for circuit diagrams/schematics and service manuals for Blaupunkt, Grundig, and Telefunken brand radios, and Wolfsburg and Emden model shortwave radios as found in VWs:
Schaltungsdienst
Lange o.H.G
Zehrensdorfer Str. 11
D-12277 Berlin (Marienfelde)
Telephone: +49 (030) 723 81-3
Fax: +49 (030) 723 81-500
