Contrary to your assumptions, Pape C12 copies mostly came with Tuchel 12-pins, not Lemo, and, besides, the cable colors also were not consistent. Plus, I have never seen a Pape sporting PCB boards imprinted with letters.
So, rather than adding another cause of failure by presumption, I suggest you do what I do in cases where there is no way to predict connections with 100% reliability: visually trace and measure.
But, as native German I can add a bit of clarity:
UB+ refers to Spannung (high voltage) +
UG is high voltage ground
HZ is Heizung (tube heater+ voltage) whose wire should measure a few ohms against ground.
From there, you can easily deduct the remaining connections: ONLY TWO pins connected to your two probe ends will yield a DC resistance between 20 and 60Ω. None of the two should read any conductance to ground.
The remaining conductors will be ground (easily tested by connecting the DC probe between that wire and chassis-ground, or tube ground, or front diaphragm wire of the capsule- they are all at ground potential)
Finally, you will have to identify the variable polarization voltage wire. That's easy, too: it will be a wire directly connected to a 30 or
33mΩ resistor. The only such connection on the mic.
Best of luck!