Quite an extensive list, almost all of these are in Adobe Acrobat format.

Tube data and amp schematics online.

Online database and search facility for data sheet links, pinout information, substitutes and application data for over 13000 vacuum tubes. Includes links to hundreds of schematics.

The industry standard for tube specifications.

From NJ7P great site for tube searches. Very many data sheets and examples, includes application notes for some tube types.

Archives:electron tube datasheet database, 1958 - 1961. Application notes also.