Historic • www.aes.org/aeshc • www.dickdale.com/history.html • www.fendermuseum.com • www.grommesprecision.com/grommes/grommeshistory/storyofgrommes/storyofgrommes.htm • www.hammondmuseumofradio.org • www.heathkit-museum.com • hhscott.com • www.museumofmakingmusic.org • www.radiomuseum.org • svarchive.stanford.edu/holdings.html • www.thordarsonmagnetics.com/history.php Resources • www.aikenamps.com/Bibliography.html • www.audioxpress.com/resource/audiomarket/index.htm • www.groovetubes.com • www.kbapps.com • www.normankoren.com/Audio/index.html • partsconnexion.com/ • www.plitron.com/audio_articles.asp • www.tubesandmore.com • www.worldtubeaudio.com