- Cathode Corner
- Details the progress of constructed electronic components including clocks operated by the device.
- Communications and Power Industries - Power Grid Devices
- Overview of developed products specializing in transmitter tubes and other electronic components.
- Dr. Tube
- Claims to have expertise in modifying and repairing of tube amplifiers as well as purchasing of components needed.
- Duncan's Amp Pages
- Collection of technical references for SPICE simulation techniques and index of downloadable applications.
- Glowbugs
- Provides an archive of documents discussing circuit arrangements of electronic devices and vacuum tubes.
- Hamtubes.com
- Indicates the purchasing processes of available tube products. Provides a classified index of devices.
- Mike's Electric Stuff
- Contains instructions on how to build various devices such as miniature valves, photoelectric cells and Geissler tubes.
- Nixie Tubes
- Technical guide indicating the mechanism of the numeric form crafted for electronic devices.
- Radiopistoia.com
- Showcases assembled receivers by the hobbyist with technical specifications presented. Also features schematic diagrams.
- RF Power Exchange
- Ordering procedures for transistors used in radio frequency and other equipment used for connectors and military radio spare parts.
- Russian Tube Factories and Logos
- Provides details on manufactured products by the Soviet inventors. Includes classification of different devices.
- Shortwave Transmitter Tubes
- Indexes supplier of the electronic device with information on each of the manufacturer's location and contact references.
- Svetlana Tubes
- Indexes available parts and components for the electronic device. Also provides technical articles.
- Technical Papers and Data Sheets
- Contributed article discussing safety operations and relevant techniques of manipulating tubes.
- Triode Electronics Inc.
- Details of supplied devices including amplifier parts, transformers, capacitors and other components.
- Tube CAD Journal
- Reference for analysis and design of tube circuits as compiled by John Broskie including article archives and news updates.
- Vacuum Tube Valley
- Compilation of common facts and other descriptions about the electronic component with an index of alphanumeric classifications.
- Vintage H.H. Scott Hi-Fi Stereo Archive
- Showcases a variety of vacuum tubes manufactured from previous years with a gallery of products.
- Virtual Valve Museum
- Selection of different types of the electronic tools with pictures of the equipment and specifications on its capacity.
- World Tube Audio
- Gallery of different tube amplifier with descriptions provided as well as newsletter archives.
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