Tubezone.Net Tube Data
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
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(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.
 
Small Signal 
12AT7 ECC81 (184kb)

12AU7 ECC82 (167 kb)

12AY7 6072 (98 kb)

12AX7 ECC83 7025 (397 Kb)

26 (UX226, CX326)

27 (UX227,CX327)

3A/167M (British equivalent to 437A Western Electric) 
3A/172B HL1320
417A 5842
5687
5691
5692
5693
RCA Special Red Tubes (5691, 5692, 5693) brochure
5751
5879 (155 Kb)
6AB4 EC92 (JAN data)
6AJ5
6AK6
6AN5 6AN5WA (JAN data)
6AU6 EF94 (235 kb)
6AU6WC JAN
6BR7 8D5 - Brimar's competitor to the EF86.
6C4 EC90 (also see 12AU7)
6CB6 6CB6A (JAN-6CB6A)
6CG7 6FQ7 (see also 6SN7) (177 Kb)
6DJ8 ECC88 (171 Kb)

6EU7 (see also 12AX7 ECC83)

6GH8 6GH8A
6J5 6J5WGT
6J7 (also 1620 and EF36) (126 Kb)
6L5 6L5G (167 Kb)

6N6P 6H6P (Russian dual triode)
6N7 6N7G 6N7GT ECC31 1649 (156 Kb)
6SC7
6SJ7 6SJ7GT 5693 (144 Kb)

6SL7GT ECC35

6SN7GT 6SN7GTA 6SN7GTB (149 Kb)

6111 (subminiature twin triode)
6463 (Philips SQ special ECC86 dual triode)
6611 (subminiature battery pentode)
6688 E180F (JAN 6688)
6829 (special 5965/E180CC)
7119 E182CC
7247 12DW7 ECC832
7327 (special 6111)
7586 8393 Special nuvistors (RCA data)
7587 nuvistor (Philips data)
8056 nuvistor
8058 nuvistor (Siemens version in German)
76
C3g German wideband telephone repeater pentode
D3a 7721 Broadband high-Gm pentode
DC70 Subminiature triode
EAC91
ECC40 Basically an ECC32 with a different base.
ECC84 PCC84
ECC804
ECC808
ECC2000
ECH35
EF50
E282F Broadband high-Gm pentode
E810F 7788  Broadband high-Gm pentode
EF86 6267 (179 Kb)

Rectifier, Regulator and Thyratron 
2050
2051
5644 Subminiature regulator
5696 Miniature thyratron
5AR4 GZ34
5R4 (5R4GY, GYB)

5T4
5U4 (5U4G, 5U4GB)
5V4 (5V4G, 5V4GA, GZ32)

5Y3 (5Y3G, 5Y3GT) (303 Kb)

5Z4
6AX5GT (141 kb)
6CA4 EZ81

6X4 6202 EZ90 (282 kb)

6X5 6X5G 6X5GT EZ35 (145 kb)
6Z4 China (Chinese version of 6X4)
6106 (Bendix super-duper 5Y3GT)
6203
8020 GL8020
CK1006 Raytheon gas rectifier
U18
U54

Strobe Tubes
EN10

Power Output 
12E1 (216 kB)

12E14 35 watt 800 volt British beam tetrode.
13E1 (National data)
13E1 (AEI data)
204A
211 VT4-C (253 kB)
2A3
2E24
3B/240M (high-gain HF triode output)
3D21A 
350B
4-400A
4043C 4043D  35 watt medium gain STC British triode
45 (UX245,CX345)
4A/137B 4045A (Co-planar triode)
4CX250B(312 kb)
4-250A C1112 English Electric Valve
4-400A C1136 English Electric Valve
4X150A(284 kb)
50L6-GT

5656 Dual tetrode
5755 High performance high gain dual triode
5881 (see also 6L6G 6L6GC 807)(178 kb)
5B/254G, 5B254M, 5B/255M, 5B/256M, 5B/257M, 5B/258M - All are special British versions of 807 or 6L6
5C/450A Huge glass pentode with 212E style base 
6005 (JAN-6005W)
6080 (6AS7G, 6AS7GA) (234 Kb) (JAN-6080WC)
6146 (6146A, 6146B)(1.58 Mb)
6197 (JAN-6197)
6336A (430 kB)
6360 (QQE03-12) Dual tetrode
6550A (168 KB)
6973 (194 kb)

6AQ5 EL90 (see also 6V6 and 6005) (257 kb)
6B4G (Sovtek) (see also 2A3)
6BG6G 6BG6GA

6BM8 ECL82

6BQ5 EL84 7189 (also see 7189A)  (275 Kb)
6CH6 EL821 CV4055 
6CW5 EL86 (with plans for "single ended push pull" amp) (259 kb)
6G-B8 6GB8 (see also 8417)

6L6G (also see 6L6GC 5881, and 807 pages) (1.8 Mbytes)

6L6GC (also see 6L6G 5881, and 807 pages (289 Kb)

6P1 Ediswan
6P25 Ediswan
6P26
6P42C (6Pi42S) Russian
6P45C (6Pi45S) EL519 Russian
6V6 6V6GTA 6V6GT 6V6G 7408 (see also 6AQ5)
71A (UX271, CX371)

7189A (also see 6BQ5 EL84 7189) (149 kB)

7233
7403 (Bendix super-rated version of 3D21)
7591 7591A (also see 7868)
7868 (also see 7591)

7984
803
807 5933 (RCA USA data) (288 Kb)
807 (STC Australia data) (704 Kb)

807 (curves only, curves also apply to 5881, 6L6G and 6L6GC) (2.6 Mbytes)

807 (STC Australia) Plans for 75W Class AB2 amplifier (600 Kb)

811A (242 Kb)

845 (also see Western Electric 284)
6883
8032
8552 (special 6146 types)
8106
8417
8627 Nuvistor power triode
8643 twin tetrode
8950 (278 kb) RF linear and "kicker" tube
C1166 English Electric Valve pulse tetrode 
CCS1 Y799 Special 4CX250B
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
EL2 EL32
EL34 (complete Amperex/Philips data) 
EL509 EL519 6KG6 6KG6A
F2a
GM70
KT33 KT33C
KT61
KT66
KT77

KT81
KT88
KT90 (134 Kb)

P2 LP2 Marconi
PE1-100
PL508
PP5-400 (PX25)
QB3-200
QB3-300
QB4-1100 (4-400C)
QE08-200
QY4-250 (4-250A)
QY4-400
R120 (6A5G)
SV83 6P15
S11E12 output pentode
S2P20 output pentode
TY4-400 High power triode


GEC - Marconi special valves
A1714 CV408 Planar Triode
A2134 CV2179 Output pentode like EL84 
A2293 Miniature power triode
N78 6BJ5 Output pentode
TT21 TT22 (special versions of KT88)
Z319 secondary emission pentode
Z359
Z759

Telefunken special valves (pages are in German)
AC100 AC101 signal triode
AD100 AD101 output triode
AD102 output triode
AH100 mixer/frequency converter
MC1 Small signal triode
MF2 HF pentode
NF2 HF pentode
NF3 HF penode
NF4 HF pentode
RG12D2 Dual diode
RL12P10 Output pentode
RV12P2000 HF Pentode
RV12P2001 HF Pentode
RV12P4000 HF Pentode
RV2P700 HF Pentode 
RV2P800 HF Pentode
SD1A HF triode


Taylor Tubes
Most Taylor tubes without the "T" prefix are interchangable with their RCA equivalents,
TT17
T20
TZ20
T21
T40/TZ40
T125
T200
203 (also 203Z, 203HD)
211 (also 211C, 211C HD)
T249/T258
T282
803
805
810
813
814
822
838

T841
845/284A
866