12AU7 - Wikipedia
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12AX7 vs 12AT7 vs 12AU7 Tube Shootout (Differences, Which To Buy)
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12AX7 vs 12AT7 vs 12AU7 Tube Shootout (Differences, Which To Buy)
Antique Radio Forums • View topic - how to tell a 12ax7 from a 12au7 when there is no writing ?
