Members bieke Posted September 16, 2015 Members Share Posted September 16, 2015 12AX7 (developed around 1946 by RCA under developmental number A-4522) was released for public sale under the 12AX7 identifier on September 15, 1947. It is one of the few small-signal vacuum tubes in continuous production since it was introduced 68 years ago. Link to comment Share on other sites More sharing options...
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