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In Reply to: 12ax7 vs 12ax7a posted by joshuarugg@yahoo.com on March 10, 2008 at 13:33:42:
My understanding is that the "A" version's filament has a center tap so it can use either a 6.3V or 12.6V supply, depending if the tube's (two) filaments are wired in series or parallel.
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Follow Ups
- RE: 12ax7 vs 12ax7a - nsgarch 03/10/0819:32:37 03/10/08 (3)
- RE: 12ax7 vs 12ax7a - Jim McShane 19:55:50 03/10/08 (2)
- RE: 12ax7 vs 12ax7a - nsgarch 20:37:24 03/10/08 (1)
- RE: 12ax7 vs 12ax7a - Jim McShane 06:10:47 03/11/08 (0)