==Eksterne henvisninger==
{{commonskat|Pentagrid}}
*[https://web.archive.org/web/20060409160408/http://www.r-type.org/static/34mixing.htm Mullard FC4]
*[http://www.r-type.org/static/grid06.htm Octode]
*[http://www.mif.pg.gda.pl/homepages/frank/sheets/146/a/AC-TP.pdf AC/TP data sheet]{{Dødt link|date=februar 2022 |bot=InternetArchiveBot |fix-attempted=yes }}
*[http://www.mif.pg.gda.pl/homepages/frank/sheets/021/2/2A7.pdf 2A7 data sheet] {{Webarchive|url=https://web.archive.org/web/20180820185649/http://www.mif.pg.gda.pl/homepages/frank/sheets/021/2/2A7.pdf |date=20. august 2018 }}
*[http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6SA7.pdf  6SA7/12SA7 datasheet] {{Webarchive|url=https://web.archive.org/web/20190712163532/http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6SA7.pdf |date=12. juli 2019 }}
Samfund Kommunikation Teknologi