6 links
Boatanchor Dreams
islandnet.com
VE7DJX, Jan Skirrow. Information on the R-390 series of radios, including some edited collections of e-mail that provide a quick overview of the radio, its quirks and problems.
Eddystone - Classic British Receivers
qsl.net
The Story of Eddystone Radios from 1898 to 1973. There are 36 pages of history and model data.
German Tube Based Receivers
boatanchors.de
Technical information for popular German tube-type communications equipment.
Tube Type Receivers
dxing.com
Specificatiosns and pictures for a variety of old shortwave receivers.