Features the Avo CT-160 portable valve testers. Includes specification details, links, and photos.

Page provides historical overview and information about vacuum tubes, source for tube data, and resource links.

Private collection of different types of vintage valves. Includes details on photo links.

Photographs and information about this American tube tester from WW-II.

Presents personal collections of valves that includes exhibit details, documents, and upcoming events.

Information site for vacuum tube equipments, with links on other radio devices.

Features the collector-historians interested in the use, history, and preservation of electron tubes and electron tube technology.

Provides informative articles, and customer service in offering individual assistance to collectors in identifying long lost or vintage tubes.

Information, with photos, of various tubes and testers, offers to repair or restore.

Showcases portable units of tube testers, information on technical manuals and tube data, and page index.

Featuring the large Westinghouse 861 Power Triode transmitting tube.