Articles about these communications receivers and others at the "Phil's Old Radios" site.

The Story of Eddystone Radios from 1898 to 1973. There are 36 pages of history and model data.

Technical information for popular German tube-type communications equipment.

Information on full range of Racal RA series receivers and associated equipment.

Specifications and pictures for a variety of old shortwave receivers.

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.

WA3KEY presents everything you need to know about the Collins 51J4.

Links to the HBR tube receivers, and Heath gear mods.

Construction article for building this receiver accessory to filter out crud. Schematic diagram and parts list are included.

Details on rebuilding Collins R-390A receivers. Pictures show details of restoration, and documents are available to help you.