Neumann U87 Clone D-87M Build Guide by Andrew Schaap

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lukas said:
Take 20k Pot in place R14  and set voltage to  20,62v.

I really did not understand the goal of this ?..R14 has the value needed, why should i change this ? This voltage is also far from the 11,5v needed..no ?.
 
http://studio939.blogspot.com/2012/12/vintage-u87-circuit-clone-microphone.html

...set 3v drop across R14(in mine some 20,62).
 

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