Tube DATA sheets
- The industry standard for tube specifications.
- http://hereford.ampr.org/cgi-bin/tube?index=1

Triode Electronics
- Tube data and amp schematics online.
- http://www.triodeel.com/tubedata.htm

Tube database search
- From NJ7P great site for tube searches. Very many data sheets and examples, includes application notes for some tube types.
- http://hereford.ampr.org/cgi-bin/tube

Data Sheets
- Quite an extensive list, almost all of these are in Adobe Acrobat format.
- http://www.mif.pg.gda.pl/homepages/frank/index.html

WPS
- Archives:electron tube datasheet database, 1958 - 1961. Application notes also.
- http://www.wps.com/archives/tube-datasheets/