A masterpiece is never finished! But I see it as this: SSL wanted to maintain a "star ground" referring to the audio "0V" since it is floating in the supplies
it is usually "anchored" to the studio's technical ground i.e. a huge wire going from the copper bar in the desk to the earth spikes, then
branched out to the patch bay and computer, the third pin on the a.c. line of the power supplies only goes to the chassis of the power supplies.
Sometimes "ground" can confusing at times so I try look at is as such: The desk is the ground "star" (via huge cable) If ground loops are created
in the outboard gear due to poor "technical ground" then said inputs (or outputs of gear) "screen" should be lifted, at step further is to add a .1uf cap
but that is a talk for another time! but since mics have no ac ground the screen should should never be lifted (as you know)! sometimes tube mics
can create a ground loop then you can either lift the screen or ac connection to the screen in the mics p.s. my 2 cents on SSL ground. Did you check for
48v at the top and bottom row of mic bay? I saw no mention, but I did not read the whole thread. cheers. N
