Hi Ed,
Things worked out differently from what I planned.
1.
It appeared that it is not just a matter of attaching the Buffalo to the "powerplant"
because the output of the Buffalo is + and - volt while the powerplant was setup for balanced DACs with + only, hence + and - connected (I hope you can follow what I mean, but this is about 2 DACs per channel, not in parallel, but balanced).
Of course I can change this, but it means work which implies work again when it needs to be reversed (and remember, this is only testing around a bit). So ...
2.
So I deciced to build the IVY and all, which was completed Sunday morning.
3.
From then on I'm struggeling with the Buffalo DAC ...
RCA out gave hum all over (and I mean MUCH hum and a little bit of music), and I decided to setup a balanced means of output. Officially my amps are not balanced, but since I planned to make 'm like so, it was a good reason to do it now.
4.
This means of "balanced", gives some (but too much) hum by itself, thus also to the NOS1 DAC.
One very well could say that right now I am in a big knot of ground loops and 10ths of meters of shunting wires are all over, and the one setup doesn't suit the other change (and creating one acceptable setup really takes hours).
And additional problem I have, is that I play without preamp, but when such a hum is exposed as the Buffalo does so far, this is not allowed (breaking windows). So, the pre-amp has to come in again, and that by itself destroys the ground loop setup.
So I'm in circles ...
But as soon I have some result, I will post it !
Peter
PS:
Donīt you lack a common star ground in your drawing? to chassis even?
Hahaha, I gave a smart answer there. Now I better ask you Leif !