The whole point of Litz wire is than every strand weaves across the whole cross-section equally so current can't be crowded into one wire more than another. Having a central wire and four outliers doesn't follow that recipe as well as it might - just twisting the 5 strands with a cordless drill/screwdriver would work better and is simpler. So long as the strands are separately insulated that ought to do a good job. Some Litz wire is braided, but that gives a lower packing density than simple twisting and is not easy to make either.
If it's the silk wrapped litz commonly sold for tonearm wiring, then braiding is the only means to keep the wires tightly bundled. The wire is too flexible to remain twisted.
I know it's an old post, but since the thread still seems to be going on:
There is at least one issue with the cut shield connections marked 'x' in the diagram.
You want any energy intercepted by the shield around the left and right line pairs dumped at the turntable preamp ground, and only there, with one path only (no ground loops).
Therefore, the shield connection at 'xC' should NOT be cut, otherwise there is no path from the head shell shield and the tonearm wand cable shield to the preamp ground.
The connections at xB1 and xB2 should not be there, since they create ground loops, so cutting them is correct.
xA2 indicates a cut in a connection from a 'cart body' shield to the 'minus' side of a differential pair, that connection doesn't make sense, so if it is there, it should be cut.
I'm not sure what to make of xA1 and the 'cart body' shield inside the 'head shell' shield. If you connect the two shields, then one of them is superfluous, and any noise intercepted by one of them is coupled to the other one. Leaving any conductor floating is not a great idea either. So if there is an inside shield and a connection to an outer shield, I would leave that connection alone.
Another issue with the diagram is the separate shields for the left and the right pair. As drawn, with only one shield interconnect at the tonearm base connector, there is no choice but to connect the left and right shields at that connector. But ideally there would be no ground loops, so my preference would be for a single shield around both pairs that runs all the way from the head shell to the preamp ground.
What the diagram does not show is the relationship between the preamp ground and the overall system ground (for motor, power supply, cases). They are probably connected somewhere, but you don't want any ground potentially carrying a lot of noise anywhere near the preamp. (By 'preamp' and 'preamp ground' I mean the amplifier circuit actually dealing with the turntable input, and its ground reference, not the whole box called preamp that probably has a bunch of different inputs. That box might very well have a much higher ground noise level than the turntable preamplifier. )
Regarding the twisting of the already twisted left and right pairs: if the preamp input is truly differential and balanced, then I don't see what the second twist is supposed to achieve.
Regarding carbon fiber composite grounding: for a simple DC ground a screw that cuts into the bulk of the composite is good enough. To actually make use of the shielding properties of the carbon fiber, you need a good AC connection, which typically would involve copper strips or a wire mesh co-cured with the carbon fiber composite (see e.g. https://arxiv.org/abs/hep-ex/0504036).
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