Hi all, Matthew has been in touch and reminded me of the new build manual he sent me

dated 2011.
I compared it with the older pdf files and in the matters we are talking about (fitting the earth lift) they both agree. C9 neg and the black speaker posts are connected to the 0V star Signal ground point. The earth lift components are fitted between chassis Mains earth post and one black speaker post.
Matthew will look at updating the earth and 0V ground symbols for the next re-print. I’ve removed a line in my last post to avoid ambiguity. Any future builders in doubt please ask Matthew or on here