- LP Gear
 - Specialises in replacement parts for turntables including belts, needles (styli), and phonograph cartridges as well as vacuum tubes and phono preamps. - Pat's Tube Schematics
- Library of tube stereo and recording equipment schematics, custom modification and restoration consulting.
- Vacuum Tube Page
- Vacuum Tubes For Beginners
- Tales of early '70s tubes, mainly from the viewpoint of amateur radio.
- World Tube Audio Portal
- Related link list of forums, newsgroups, tube amplifier collections, tweaking, repairs, and more.
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