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12AX7 Pinout
basing pinout

 

12AX7 Substitutes
Close or identical 12AX7R, CV10319, CV492, ECC83
Different rating or performance 12AX7A, 12AX7S, 12AX7WA, 5751, 5751WA, 6057, 6681, 6L13, 7025, 7382, 7494, 7729, B339, CK5751, CV4004, CV4017, CV8156, CV8222, CV8312, E2164, E83CC, ECC803, ECC803S, ECC863, M8137, QB339
Different filament voltage 20EZ7, 6AX7

Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.

 

12AX7 Ratings
Vh Ih VaMax VhkMax PaMax IkMax
6.3 0.3 300 100 1 8
12.6 0.15 300 100 1 8

 

12AX7 Application Data
Class Va Vg1 Ia Ra S
Triode 100 -1 0.5 80,000 1.25
Triode 250 -2 1.2 62,500 1.6

 

12AX7 Data sheet links
Dave Cigna''s Pages (DuncanAmps mirror) 12AX7: html
David Crittle''s site (Retrovox) 12AX7: Acrobat PDF application sheet
Duncan''s Amp Pages 6L13/ECC83: Acrobat PDF (5 pages)  Vade Mecum s.345: Acrobat PDF (2 pages)
Peter Millett 12AX7: Acrobat PDF 65K  12AX7-A: Acrobat PDF 204K  5751: Acrobat PDF 208K  7025: Acrobat PDF 224K  20EZ7: Acrobat PDF 186K
National Valve Museum 12AX7: html  ECC83: html2
oldradio.qrz.ru 12AX7: MK buizen handboek  6L13: MAZDA Valves & Picture Tubes Data  ECC803S: html page
Penta Laboratories 12AX7A: Acrobat PDF
Frank Philipse 12AX7: .gif file, 082/e/ECC83.pdf, 093/1/12AX7.pdf, 126/b/B339.pdf, 137/1/12AX7.pdf  ECC83: 010/e/ECC83.pdf, 030/e/ECC83.pdf  12AX7A: Acrobat PDF  5751: 093/5/5751.pdf  5751WA: 087/5/5751WA.pdf  6057: 117/e/ECC803S.pdf  6681: 009/e/E83CC.pdf, 049/6/6681.pdf  7025: 135/7/7025.pdf  E83CC: 062/e/E83CC.pdf  20EZ7: 049/2/20EZ7.pdf
Frank Philipse (Pocnet mirror - Patrik Schindler) 12AX7: 12AV6.pdf (96362 bytes), 12AX7.pdf (1035372 bytes), 12AX7.pdf (155076 bytes), 12AX7.pdf (288086 bytes), 12AX7.pdf (298923 bytes)  ECC83: ECC83.pdf (152663 bytes), ECC83.pdf (2442186 bytes) (cs), ECC83.pdf (474468 bytes), ECC83.pdf (701380 bytes), ECC83.pdf (94156 bytes) (de)  12AX7A: 12AX7A.pdf (175904 bytes), 12AX7A.pdf (176880 bytes), 12AX7A.pdf (374410 bytes), 12AX7A.pdf (602706 bytes) (fr)  12AX7S: 12AX7S.pdf (227978 bytes), 12AX7S.pdf (659411 bytes) (fr)  12AX7WA: 12AX7WA.pdf (169487 bytes)  5751: 2050.pdf (813252 bytes), 5751.pdf (106405 bytes) (de), 5751.pdf (136071 bytes), 5751.pdf (222944 bytes), 5751.pdf (231531 bytes) (de), 5751.pdf (689521 bytes) (fr)  5751WA: 5751WA.pdf (262382 bytes), 5751WA.pdf (269752 bytes)  6057: 6057.pdf (66618 bytes)  6681: 6681.pdf (193751 bytes), 6681.pdf (230504 bytes), 6681.pdf (85786 bytes)  7025: 6201.pdf (902849 bytes), 7025.pdf (192602 bytes), 7025.pdf (210739 bytes), 7025.pdf (255087 bytes), 7025.pdf (416698 bytes)  7382: 7382.pdf (65262 bytes)  7494: 7494.pdf (86313 bytes)  7729: 7729.pdf (231224 bytes)  B339: B339.pdf (68971 bytes)  E83CC: E83CC.pdf (203713 bytes) (de), E83CC.pdf (456084 bytes) (de), E83CC.pdf (462413 bytes)  ECC803: ECC803.pdf (111821 bytes)  ECC803S: ECC803S.pdf (1986193 bytes) (cs), ECC803S.pdf (484395 bytes), ECC803S.pdf (517186 bytes) (de)  20EZ7: 20EZ7.pdf (234774 bytes)  6AX7: 6AX7.pdf (176519 bytes)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 12AX7: 12AV6.pdf (96362 bytes), 12AX7.pdf (1035372 bytes), 12AX7.pdf (155076 bytes), 12AX7.pdf (288086 bytes), 12AX7.pdf (298923 bytes)  ECC83: ECC83.pdf (152663 bytes), ECC83.pdf (2442186 bytes) (cs), ECC83.pdf (474468 bytes), ECC83.pdf (701380 bytes), ECC83.pdf (94156 bytes) (de)  12AX7A: 12AX7A.pdf (175904 bytes), 12AX7A.pdf (176880 bytes), 12AX7A.pdf (374410 bytes), 12AX7A.pdf (602706 bytes) (fr)  12AX7S: 12AX7S.pdf (227978 bytes), 12AX7S.pdf (659411 bytes) (fr)  12AX7WA: 12AX7WA.pdf (169487 bytes)  5751: 2050.pdf (813252 bytes), 5751.pdf (106405 bytes) (de), 5751.pdf (136071 bytes), 5751.pdf (222944 bytes), 5751.pdf (231531 bytes) (de), 5751.pdf (689521 bytes) (fr)  5751WA: 5751WA.pdf (262382 bytes), 5751WA.pdf (269752 bytes)  6057: 6057.pdf (66618 bytes)  6681: 6681.pdf (193751 bytes), 6681.pdf (230504 bytes), 6681.pdf (85786 bytes)  7025: 6201.pdf (902849 bytes), 7025.pdf (192602 bytes), 7025.pdf (210739 bytes), 7025.pdf (255087 bytes), 7025.pdf (416698 bytes)  7382: 7382.pdf (65262 bytes)  7494: 7494.pdf (86313 bytes)  7729: 7729.pdf (231224 bytes)  B339: B339.pdf (68971 bytes)  E83CC: E83CC.pdf (203713 bytes) (de), E83CC.pdf (456084 bytes) (de), E83CC.pdf (462413 bytes)  ECC803: ECC803.pdf (111821 bytes)  ECC803S: ECC803S.pdf (1986193 bytes) (cs), ECC803S.pdf (484395 bytes), ECC803S.pdf (517186 bytes) (de)  20EZ7: 20EZ7.pdf (234774 bytes)  6AX7: 6AX7.pdf (176519 bytes)
Triode Electronics 12AX7: gif1, gif2, gif3, gif4, gif5, gif6
TubeZone 12AX7: pdf
Virtual Valve Museum ECC83: HTML page

Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Please see the substitutes at the top of the page for more details

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