http://prelcoparts.com/datasheets/datasheets_001.htm
http://www.dec-electronics.com/Search1.htm
http://homepage.tinet.ie/~team289t/index.html
http://henry.fbe.fh-darmstadt.de/smps_e/
http://www.diotec-usa.com/GenPurXref3.htm
http://www.dialelec.com/
http://harmsy.freeuk.com/nic.percival/JpnTransistor.html
http://katalogi.iele.polsl.gliwice.pl/en/
http://tdsl.duncanamps.com/tubesearch.php
http://www.nj7p.org/cgi-bin/tube
http://www.mif.pg.gda.pl/homepages/frank/
http://www.diyaudio.8m.com/Ot/ot_en.html
http://www.dec-electronics.com/Search1.htm
http://homepage.tinet.ie/~team289t/index.html
http://henry.fbe.fh-darmstadt.de/smps_e/
http://www.diotec-usa.com/GenPurXref3.htm
http://www.dialelec.com/
http://harmsy.freeuk.com/nic.percival/JpnTransistor.html
http://katalogi.iele.polsl.gliwice.pl/en/
http://tdsl.duncanamps.com/tubesearch.php
http://www.nj7p.org/cgi-bin/tube
http://www.mif.pg.gda.pl/homepages/frank/
http://www.diyaudio.8m.com/Ot/ot_en.html
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