Peter,
The pinout on the 3403 Tuchel female is:
1- Audio (+)
2- Heater (4VDC)
3- Ground
4- B+ (120VDC)
5- Audio (-)
6- Shield (should be combined with ground in cable connector)

Best of luck,
Klaus Heyne

P.S.: A full schematic can be found on the internet, via Google, or oright here, on the Neumann website's historical product descriptions, under:
http://www.neumann.com/?lang=en&id=h ist_accessories&cid=hist_power_suppl ies