p0rn - Brass CK-12 and theory ?!

Jazzy_Pidjay · Apr 27, 2006

Hi !

here's pics of my CK-12
Need new diaphragms.

http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0746.jpg

I have a question, there's two or three small ring of plastik
under the diaphragm and brass ring.

Is this plastik rings, the only responsible of the gap between
backplate & diaphragm ?
:roll:

http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0743.jpg
http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0744.jpg
http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0745.jpg
http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0746.jpg
http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0747.jpg
http://img.photobucket.com/albums/v439/jazzy_pi/DSCF0750.jpg

gyraf · Apr 28, 2006

Is this plastik rings, the only responsible of the gap between
backplate & diaphragm ?

Yes, I believe so.

Jakob E.

Jazzy_Pidjay · Apr 28, 2006

:shock:

very interesting.

i suppose AKG need to adjust perfectly
the plastik and metal part of the backplate.... :shock:

Seems to be a very precision work, in order to be
sure that the gap is equal to the plastik ring thickness.

thanks !

Hayman · Apr 28, 2006

I took one of those completely apart a couple of years ago.

Made these drawings from what I found:

Spacers are not in the drawing.

Richard

rlaury · Apr 28, 2006

I would guess they were shims to adjust the CAPACITANCE between
the back plate and the diaphragm. This can also equate to distance too.
But the target capacitance is what they are after. How thick are the plastic rings and how many were there??

Great drawing BTW!

RonL

Jazzy_Pidjay · Apr 28, 2006

> How thick are the plastic rings and how many were there??

difficult to say with human eyes :?

thin for sure...

there's one in one side, and two on the other
but maybe it's like mica and i divided it when bring it.

Good 3D view !!
seems to be a very complex capsule...

rlaury · Apr 28, 2006

It would have been great if you could have measured the capacitance
before taking it apart. All the ones I've measured are 40 - 55pF.
But I've never measured the CK12.

RonL

Jazzy_Pidjay · Apr 29, 2006

i have another one with an "acceptable" tension

i can measure it today.

PS : i have build an ElaM251e Clone
and want to put this rediaphragmed CK-12
on it

I would love to try an K87... (dual backplate)

Anybody know if i need some adjustements on the circuit
or if the K87 capacitance, and tuning of K87 are "compatible"
with the ElaM251 circuitry.

thanks

p0rn - Brass CK-12 and theory ?!

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