Hello Mr Aud.
Just read your AC polarity issue at Jim’s corner.
I don’t want to write a comment on line, but would like to tell you this.
I investigated this problem some years ago, and tried to understand why this problem occurs.
The best answer I found is that it is parasitic capacintances between the primary and
secondacy windings in the power transformers that induces current into the components ground and chassie.
By just selecting the chassis voltage to the lowest possible I found that the sound will
be better, since the component with the highest chassi voltage will end up closer to the
rest of the systems components. Just like you write.
But I tried a different approach, and that was to select the different chassi-voltages to
have minimum difference, and that have in general rewarded me with even better result.
By using this technic there will be the least stray current in the ground loops.
I also tested a lot of other related issues and tried to find if the phase of the
voltage would alter or change. It didn’t. These chassi-voltages always are in phase
between the different components.
Please try, and see if you can find the same result I have found.
