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Are you looking for passive EQ?

The EF86 as pentode could substitute for the first 12AX7 in the RCA passive phono preamp. If the plate resistor was made slightly lower (the original is 100K), I believe little or no change would be required to the RIAA components. The unused half of the 12AX7 could be used in that case as a cathode follower to reduce output impedance. I don't know if anyone has published such a design.




Edits: 02/26/25

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  • Are you looking for passive EQ? - Triode_Kingdom 15:18:16 02/26/25 (0)

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