In Reply to: RE: Leak did it in their Point One preamp posted by SuperB on February 26, 2025 at 11:38:37:
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)