I never got much into the Neumann transistor consoles, they are a pain in the butt, and compared to the Telefunken/TAB 300/600 series and the Siemens 200 series, not as good sounding...
Some single modules sound O.K, but quality is quite questionable from a rebuilding point of view.
There were no two consoles alike, all custom made with different signal path structures, impedance etc. The faders they used were nearly as bad than P&G ones... If you find a console with the symmetric active Danner faders it is an entire different story...
Right at the end Neumann made the black op amp series build around their VCA chip and modules like the 476/473 and the EQs are very nice to have, but quite hard to keep up and running....
Best regards,
Oliver