I am still having issues with the machine. As far as i can track it down there seems to be more than one problem:
a) the relais stwitching between the outputs seem to have contact problems, especially that for output A. Switching back and forth between the outputs often helps but not always.
A real nuisance because this flakiness is something i seriously doubt the service people of the German distributor are able to deal with. My first impression on that service was not the best.
b) the cords. These days my backup cord went disfunctional.
Hardly used.
I measured its resistance - ok, even while bending the cord. Under the loupes i saw oxidation and possibly dirt in the contact area. I am trying to remove these by applying Caig Deoxide (an expensive stuff to clean electronic contacts. I need it to maintain my old guitar amps).
The cords seem to be much more sensitive or even prone to contact problems than the cords of the Junior.