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Questions about tubes and gear that glows. FAQ

RE: Yup, but the 5751 can be used in place of a 12AX7 so long as

Don't confuse the tube's Mu with the circuit's gain. You won't change the circuit gain by 30% since with the 12AX7 in the circuit it never achieved a gain of 100 anyway.

Look at Randall Aiken's site (link below) and you can get a handle on this widely confused concept.

Edited to clarify...



Edits: 12/14/15

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