ln76d said:440pF is little bit too much for C2 or your capsule is overbrighted (yes these chinese "ck12" can sound different a little bit).
Desolder these caps, or at least both from one side, and make voice test.
R4 is another posibility and also can causing lack of low end.
1M is really too small, i would think about 100M or 1G but not 1M
30M and 8M are also small values - but if you want to recreate something at least in 20% similar to the original then these are ok.
Rest differences of the parts are ok.
If this wouldn't help - try to change 22uF fine gold to something else (these caps sometimes can be tricky) if this not help, try different output cap, but JB usual works better than fine
Interesting. C2 (usually 100pF) is what I started with but it was indeed much too bright. I worked my way up to 440 and found it to sit well.
Wondering why the 30M would be to low value when this is the value on the Schematic. I will try a 250M since i have one here. But 30M really made the mic sound odd. Also, on the Official 251 point to point on Acrylic build and support thread it would seem that he has put in a 250M at this point. That being said I have seen a pic online where this was 800K.
I'll keep trying. At the moment it sounds pretty darn good. Just can't handle a loud vocal.
