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In Reply to: RE: Eliminating the Line Stage Output Cap posted by Triode_Kingdom on August 07, 2017 at 19:44:53
I hadn't ever considered 2-3uf to be a "huge" capacitor.
The electrolytic cap that sits from the plate of that cathode follower to ground will also be in the signal path, and my guess is that you were planning to use at least 100uF.
Still, it's certainly worth it as an experiment.
"The electrolytic cap that sits from the plate of that cathode follower to ground will also be in the signal path, and my guess is that you were planning to use at least 100uF."
The degree of "disturbance" created by the power supply cap can be quantified. Measuring the AC present at the B+ side of the cap and applying the PSRR of the stage is sufficient to determine whether the signal is likely to be affected. I am unable to do that easily with a series cap, so I find it preferable to use a small .01u rather than 4.7u for this purpose.
Buy Chinese. Bury freedom.
TK, look at the old Beveridge RM1 preamp this was done in the 80's also by Rodger me-jesky, Not of a fan of his personality, but its a very well done pre-amplifier that used op-amp servo's in all the stages I believe, I have the preamp and schematic somewhere. I need to fix that pre and listen to it, anyways
the other preamp i have is a phono op-amp based with a op-amp servo with film capacitors in the servo circuit and let me tell you the capacitors in the servo are just like any other, there very audible!
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