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12AX7-A Pinout
basing pinout

 

12AX7-A Substitutes
Different rating or performance 12AX7, 12AX7R, 12AX7S, 12AX7WA, 5751, 5751WA, 6057, 6681, 6L13, 7025, 7382, 7494, 7729, B339, CK5751, CV10319, CV4004, CV4017, CV492, CV8156, CV8222, CV8312, E2164, E83CC, ECC803, ECC803S, ECC83, 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-A Ratings
Vh Ih VaMax VhkMax PaMax IkMax
6.3 0.3 300 100 1 8
12.6 0.15 300 100 1 8

 

12AX7-A 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-A Data sheet links
Duncan''s Amp Pages Vade Mecum s.345: Acrobat PDF (2 pages)
Peter Millett 12AX7-A: Acrobat PDF 204K  20EZ7: Acrobat PDF 186K
Penta Laboratories 12AX7A: Acrobat PDF
Frank Philipse 12AX7A: Acrobat PDF  20EZ7: .gif file

 

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