Historic
• www.aes.org/aeshc
• www.dickdale.com/history.html
• www.fendermuseum.com
• www.grommesprecision.com/history.html
• www.hammondmuseumofradio.org
• www.heathkit-museum.com
• fmamradios.com
• www.museumofmakingmusic.org
• www.radiomuseum.org
• library.stanford.edu
• www.thordarsonmagnetics.com/history.php

Resources
• bunkerofdoom.com
• audioxpress.com
• www.groovetubes.com
• www.kbapps.com
• www.normankoren.com/Audio/index.html
• partsconnexion.com/
• groupdiy.com/threads/triad-magnetics.85340
• www.tubesandmore.com
• www.worldtubeaudio.com