it's a standardized DIN8pin connector; you can find them e.g. at Binder Connector company (e.g. Series 581). Soldering 8pins is a bit tedious, but perfectly feasible. In case you should have trouble assigning the wires correctly inside the N149A, send me a short direct mail (button on the left), and I can mail you details.
Best regards, Martin Schneider / Neumann Mic. Development