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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
Automatica 12AX7: html
Dave Cigna''s Pages (DuncanAmps mirror) 12AX7: html
City Radio ECC83: 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  20EZ7: Acrobat PDF 186K
National Valve Museum 12AX7: html  ECC83: html2
oldradio.qrz.ru 12AX7: MK buizen handboek  ECC83: html page, MAZDA Valves & Picture Tubes Data
Penta Laboratories ECC83: Acrobat PDF
Frank Philipse 12AX7: .gif file, 082/e/ECC83.pdf, 093/1/12AX7.pdf, 126/b/B339.pdf, 137/1/12AX7.pdf  20EZ7: 049/2/20EZ7.pdf  ECC83: 010/e/ECC83.pdf, 030/e/ECC83.pdf
Triode Electronics 12AX7: gif1, gif2, gif3, gif4, gif5, gif6
TubeZone 12AX7: pdf
Virtual Valve Museum ECC83: HTML page
WPS 12AX7: html page


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