Here you'll find manufacturers' data sheets and curves for many popular (and some not so popular ) electronic valve types.
If you can't find what you need here, try Duncan's Tube Data Sheet Locator.
These files are in Adobe Acrobat PDF format. You need the Adobe Reader plugin or Ghostscript to view them.
(Where file size isn't listed, the files are less than 100 Kb in size)
The files for the most part are in English language, a few are in Japanese or Russian.
6BR7 8D5 - Brimar's competitor to the EF86.
6463 (Philips SQ special ECC86 dual triode)
6611 (subminiature battery pentode)
6829 (special 5965/E180CC)
C3g German wideband telephone repeater pentode
ECC40 Basically an ECC32 with a different base.
E282F Broadband high-Gm pentode
Rectifier, Regulator and Thyratron
5644 Subminiature regulator
6106 (Bendix super-duper 5Y3GT)
3B/240M (high-gain HF triode output)
5755 High performance high gain dual triode
5C/450A Huge glass pentode with 212E style base
7403 (Bendix super-rated version of 3D21)
8552 (special 6146 types)
8627 Nuvistor power triode
DA42 British xmtr triode similar to 811A
DA100 Large 100W British triode sim to 845
DA250 250W British medium gain triode
DO24 2 watt Mullard triode similar to PX4
EL34 (complete Amperex/Philips data)
GEC - Marconi special valves
A2293 Miniature power triode
Z319 secondary emission pentode
Telefunken special valves (pages are in German)
AH100 mixer/frequency converter