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RE: Line amp/AVC/TVC thoughts

Adjusted to -6db (the worse case) a 100K Ohms passive resistive ladder attenuator has an output impedance of 25k ohms.

The low pass filter created by 25k ohms driving into 400pF has a -3db point of 16kHz.

I know you said "the level (and HF-extend) where acceptable" but I disagree WRT the HF-extension. A -3db point of 16kHz will shift the phase all the way down to 1.6kHz

BTW don't forget to add the cable capacitance that will make the numbers even worse.

I think AVCs are great but I'm not sure your phono pre's output impedance of 2k ohms will properly drive one.

Ask Dave.


Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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