C12 or 251
« on: April 27, 2020, 11:22:32 AM »
Hi all !

I'm about to (finally) start building my new mic !

I'm really in beetwin a c12 or a 251 !

I do have Beesneez cap, Haufe t14/1 transfo & vintage 6072 5stars ! :)

I'll do mostly vocals (HipHop & Rnb), gtrs, and some time brasses / strings

Which one would you advise ?

Cheers


TillM

Re: C12 or 251
« Reply #1 on: April 28, 2020, 04:37:22 AM »
C12 if you are an inexperienced mic builder, because the documentation from the build is much better then for the 251.
Maybe plenty of people will argument against me and it’s just my opinion, but:
I realized after building are handful of mics.
The biggest difference makes the capsule and not the circuit, so build whatever you fancy more.

Re: C12 or 251
« Reply #2 on: April 28, 2020, 03:35:00 PM »
I'm about to (finally) start building my new mic !
I'm really in beetwin a c12 or a 251 !
I'll do mostly vocals (HipHop & Rnb), gtrs, and some time brasses / strings
Which one would you advise ?
lets compare:
simple cathode bias (251)
or the "creative" biasing in the C12.
some folks like complication.

Re: C12 or 251
« Reply #3 on: April 28, 2020, 06:56:13 PM »
lets compare:
simple cathode bias (251)
or the "creative" biasing in the C12.
some folks like complication.

Can you explain a bit more ?
How does it affect the sound ?  ;)

Re: C12 or 251
« Reply #4 on: April 28, 2020, 09:21:05 PM »
Can you explain a bit more ?
How does it affect the sound ?  ;)
they both sound fantastic (imho).
"ears" have preferred the 251 by a small margin.
the 251 is biasing is easier to build and troubleshoot the tube/mic.
the biasing topic has been discussed extensively.
am sure you have studied the differences.

another advantage of the 251 circuit is the compatibility with most Neumann AC701  microphones.
if you have or planning on KM54/KM56 type mics,  simply insert a 20 ohm, 1/2 watt resistor in the cable connector,
in series with the heater supply.
Not a problem fitting  in a 5 pin XLR.
« Last Edit: April 28, 2020, 11:38:22 PM by gridcurrent »

Re: C12 or 251
« Reply #5 on: April 29, 2020, 01:29:54 PM »
the 251 is biasing is easier to build and troubleshoot the tube/mic.
the biasing topic has been discussed extensively.
am sure you have studied the differences.

another advantage of the 251 circuit is the compatibility with most Neumann AC701  microphones.
if you have or planning on KM54/KM56 type mics,  simply insert a 20 ohm, 1/2 watt resistor in the cable connector,
in series with the heater supply.
Not a problem fitting  in a 5 pin XLR.

Oo.. no ! havn't seen it !
I'll go to look for it  :)

I'm not planning to build an other one soon after ;)
Too much other stuff are interesting, no need for a KM

Re: C12 or 251
« Reply #6 on: May 02, 2020, 02:59:28 PM »
m251 polarization circuit  in cardioid mode sounds much better than remote variable polar pattern one on C12

Also gives better S/N ratio by about 3db

No capacitor between the capsule and the tube grid


 

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