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RE: Thoughts on RCA 12AU7. Clear top vs Blackplates

RCA cleartops tend to have high trans-conductance compared to most 12au7. This is something that is not stated often. As a result, the cleartop gives you more drive which would suit circuits where 12au7 is used in the output stage. Another 12au7 types with high trans-conductance is the Telefunken ecc802s.


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