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In Reply to: RE: EF86 for phono stage? posted by SuperB on February 25, 2025 at 05:49:39
Link to schematic below
Lots of feedbacks........
I built a power supply for it too since it was bereft of the matching power amps. It was quite musical. The feedback in this preamp is well executed, being mixed with the incoming audio rather than mixed inside the tube. This results in a more musical presentation.
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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