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RE: LCR Phono stage

The problem with measurements and sims for that matter is they only show you what the presenter wants you to see. You were trying to show how perfect a 50K pot was but fed it into an unrealistic 15pf load. Using the 1X probe and its ~100-150pf capacitance is much more realistic of what may happen in the real world. In the plot below a 50Ω source is driving a 50kΩ pot set to -6dB. The green trace is 15pF, blue 30, red 60pf cyan 125pf Violet 250pF and gold 500pF.





Granted this represents the absolute worst case setting scenario (-6dB) and explains why many opt for a 10K pot for attenuation which makes things appear much better and 1K would be nearly perfect but then we are back to the question of how to properly drive a 1K volume control and the answer is obviously a cathode follower loaded with a CCS and we are back on topic. :-)

10K pot set to -6dB into varying capacitances








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