| Kiewa Vally Stereo | H.J.Leak web site with loads of info on most of the Leak amplifiers, restoration articles and circuit details. |
| The TubeStore | Search a database for most tubes and their availability |
| The London Vintage Radio Club | Club for vintage audio equipment fans, with their own newsletter and For Sale/Wanted classifieds. |
| Triodeel | Contains data sheets and other information on many valves |
| Paul Stenner's Vintage Radio Repair & Restoration | A very good site on a grand variety of vintage equipment. Worth a visit. |
| Quad World | Information on valve coding and other Quad amplifier info |
| Vintage Radios UK | A searchable valve directory |
| Ulrich's Vintage HiFi pages | Loads of valve amplifier info (various manufacturers) and a one-stop audio link site ! |
| Retro Hi-Fi | A site containing information on many of the classic audio equipment including Leak, Thorens, Quad, SME, etc. |