OG U47 schematics question.

[Drea]

Hi folks, a little question about the Neumann U47 schematics, it’s for me odd that on the original U47 mic the f1 and f2 on the VF14 pins are inverted to the schematics. Look to the picture. On my original U47 (not modded ) it’s not like as in the schematics. Is that odd or do I read wrong. What I actually don’t get is that nobody has ever ask this question because it’s very misleading. It’s strange because it can’t be different so I think the schematics is wrong with the f1 / f2 on the pins out schematics tube picture.
Thanks ..

 

[Khron]

And that is relevant to anything how, exactly? Isn't the filament just a piece of wire, polarity-agnostic, that can be powered via AC or DC?

 

[Drea]

Thanks for your input.
so it doesn't matter whether the power is on f1 or on f2 in combinatie with pin K. I find it strange that they inverted the pinout in the schematic.

 

[RuudNL]

Current flowing from f1 to f2 is the same as current from f2 to f1...
Result: it will heat the filament!