Datasheet Catalog - .PDF datasheets for electronic components, including RF modules, transistors, integrated circuits, and amateur equipment. Dr. Tube - Tube datasheets. Russian Tube Data - Original datasheets are scanned mostly from the 1966 Electron Devices Reference (in Russian) and saved as .GIF graphics. Tube Data - Interpretations of pages copied from a Russian language tube specification manual. Electronics 27 - Vacuum Tubes - Covers vacuum-tube electron devices, especially receiving tubes, and offers suggestions for experiments. WA2ISE sub-miniature tubes - Pencil tube data and pin-outs. Tube Data Sheet Locator - Data search, pin-outs and substitutes for many tubes. Includes links to schematics. DL7AVF The Tubes and Valves Online Database - European electron tube charts with characteristic data, basing diagrams, and application information. Includes Russian types.