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Röhren/Tubes
http://www.elektronikinfo.de/strom/roehren.htm (Aufbau und Funktionsweise von Röhren)
http://www.ginko.de/user/franz.hamberger/roehren/index.html (Röhrentabellen)
http://frank.pocnet.net/
http://www.tubecad.com/ (online Zeitschrift)
http://www.electricstuff.co.uk/ (alte Röhren)
http://www.jogis-roehrenbude.de/
http://www.gfgf.de/
http://www.oldradio.de/
http://www.antike-radios.net/
http://www.duncanamps.com/ (Röhrendaten)
http://www.duncanamps.com/tdslpe/index.html
http://www.infomaniak.ch
http://www.ampage.org/ (Schaltpläne kommerzieller Röhrenverstärker)
http://www.frihu.com/
http://www.pauls-roehren.de/
http://www.b-kainka.de/
http://www.tubeampdoctor.com/index.php?cPath=93
http://www.aikenamps.com/StarGround.html
http://tinpan.fortunecity.com/saints/668/primer/index.html
http://www.infomaniak.ch/~bonavolt/t_bas.htm
http://www.nmr.mgh.harvard.edu/~reese/RC-10.html
http://www.sonicfrontiers.com/anthem/taste.html
http://www.aston.ac.uk/~saddrj/library.htm
http://www.chimeralabs.com/~CL/KyrieArticles/KyrieArticles.html
http://members.aol.com/sbench101
http://web.mit.edu/cheever/www/main.htm
http://www.newmex.com/f10/mustage.html
http://www.patents.ibm.com/details?pn=US05680074__&language=en
Über Unterschiede bei der legendären 300 B:
http://www.enjoythemusic.com/magazine/equipment/1201/300b/index.html
Diverses:
http://www.arduman.com/aa
http://www.duncanamps.simplenet.com
http://home.earthlink.net/~aprilsound/gallery.html
http://www.enjoythemusic.com/triode
http://www.enjoythemusic.com/tubelust
http://www.geocities.com/CapeCanaveral/Launchpad/8145/arindex.html
http://www.geocities.com/ResearchTriangle/8231
http://www.haute-fidelite.com/index.html
http://www.infomaniak.ch/~bonavolt/audioel.htm
http://www.machmat.com/schema/index.htm
http://www.macnet.or.jp/pa/upi-k/index.html
http://members.aol.com/elitetube/index.html
http://www.sw.com.sg/~oleg/tube/schematics/tubescarchive.html
http://www.teleport.com/~tube
http://www.tnt-audio.com/clinica/ta/indexe.html
http://home.t-online.de/home/MHuber/
http://www.users.globalnet.co.uk/~valveamp/ReadIt.htm
http://www.users.globalnet.co.uk/~johnb/hifi.htm
http://www.radioking.at/
http://www.tubecollection.de/ura/roehrensammlung.htm
http://frank.pocnet.net/index.html
http://www.radiomuseum.org/?language_id=1
http://www.r-a-d-i-o-s.de/
http://antiqueradio.org/welcome.htm