Mac 1700 distortion when balance on middle

I'm working on this unit, and it is fairly simple ( at least compare it to the monsters Sansuis, Pioneers and Marantz from the 70's that I'm use to it), the only thing that takes a lot of time is the McIntosh parts numbers, and the "send it to your McIntosh dealer" culture which seems to consider DIY as heresy...(Yeah right, like my dealership would care for a cheap 50 years old unit) but the parts replacements seems to be available.

How is your project going? on mine I'm waiting for the outputs and drivers transistors., I have all the C128 to C133. waiting to get in.

BTW, I love this unit.
 
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Actually had too many things going on and this project left aside ..
Now getting back to it and trying to remember and pull the notes and pics (which got deleted) of the internals especially the wiring.
I have few unsolved issues
One of them is the +120 - where does it go to?
 

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