connecting SME 3009 S2 (ground)

[myleftear]

Hi friends
I am redoing my father's TD-125 with SME 3009 S2 imp, and renew the wiring to the pre-amp.
when I opened the connector, I saw that he connected the arm's ground to one channel's ground, thus avoiding a separate gnd-wire...
That sent me into research-modus, and now I am confused.
On one side, I think it is better to go after the books and have the tonearm-/chassis-gnd separated from signal-gnd, on the other hand someone was saying something like "the ground-wires' capacitance adds up... here: https://www.diyaudio.com/community/...ld-style-cable-connector.278825/#post-4438868

What do I do with that? (I'm actually tempted to believe the shield's capacitance does not interfere with the signal's)
So it is still better to keep gnd separated, yes?

Thank you so much!

 

[Citizen124032]

As long as the separate ground wire runs in parallel with the signal cable, it's ok.
It was also done to use the right (I think) signal shield as a common ground too.
The photo's show a left - right - common shield - chassis ground arrangement.
Not the prettiest solderings however.

 

[myleftear]

My dad did this (I believe)! Some 40,50 years ago… I was astounded too. 😳 will do my best to better it, HA!

The parallel ground-wire, not a problem as I‘ll tie them together, is this about capacitance?

Thanks!

 

[Citizen124032]

No, just to avoid a ground loop, acting as an antenna picking up radio and other noise.
There is phone cable available with this separate ground wire molded together.
And most often, it is low capacity cable. Has nothing to do with your 'ground capacitance'.

 

[myleftear]

ok.
thank you, C124032