Electronics

Where? Name? What? About?
Manufacturer New name for Hewlett-Packard instruments
Info

Lots of info about almost all Bang & Olufsen products

Collector

All about Dynaco gear

Manufacturer High quality measuring equipment
Distributor Swedish distributor for Hameg and many others
Manufacturer Top of the line equipment for Radio communication
Manufacturer Top of the line oscilloscopes and video test equipment
Tubes
Where? Name? What? About?
Ask Jan First Dealer A lot of American and European tubes for sale.
Cathode Corner   Collector A digital clock with a CRT as display, very nice.
Crowthorne Dealer A lot of common and not so common tubes.
Dieter's Tube-Testers Collector A nice summary of a lot of nixie tubes
Duncan's Amplifier Info Lots of info about tubes with schematics etc.
Frank's Electron Tube Data Sheets Database More than 10 000 Tube data sheets in PDF.
Funkamt Collector Site about Radio, tubes etc.
Homepage of H.T.Schmidt Collector Here you can find interesting info about German Post-röhren, Wehrmacht-röhren and a lot more. 
JMH's Virtual Valve Museum Collector Interesting collection of various tubes.
Jogis Röhrenbude Collector Lots of info about tubes and old radios. Very informative.
Mike's Electric Stuff Collector Covers a wide range of vacuum tubes, light bulbs, Geissler tubes and miscellaneous high voltage stuff. Highly recommended.
Netherlands Institute for Sound and Vision Museum The former Dutch broadcasting museum. Don't go to The Netherlands without visiting this place.
Museum Virtual museum with lots of info about old radios.
Sphere's Dealer Lots of CRTs for sale.
Röhrenmuseum Museum German site with lots of pictures and interesting info. In German language.
Tektronix Resource Site Forum Interesting information about old Tektronix instruments.
Telemuseum, Stockholm, Sweden Museum Was the worlds largest collection of old telephone equipment as well as an impressing amount of radio stuff.
Telemuseum is CLOSED - What a shame
Tube Collectors Association  Collectors Homepage of the Tube Collector's Association.
Udo Radke's collection Collector One of the worlds largest private collection of old radio tubes. Very impressing.
Wumpus home page Collector Old radios and other things.
Flags courtesy of ITA's Flags of All Countries used with permission.