C-12 and 251 Clone acrylic piont to point boards for Apex 460

OPR · Oct 21, 2013

Australian made AKG C-12 and 251 point to point boards for Apex 460 Alctron HT-11A, ShuaiYin,SYT-1200 !!

Prices are 251 $100.00 USD C-12 $120.00 USD postage $25.00

I recommend at this stage that those who are building the C12 Use The Matador/Chunger PSU if they can't already workout how to
mod the Apex unit, as It's probably the safest way...

Email your interest to[email protected]

C12 circuit

251 circuit

Here are some audio examples
Both of the following examples have the 251 on vocals and the C12 on Drums and strings among other things, The capsule used is Tim Campbell's Ct12

http://kalacoma.bandcamp.com/

http://wondercoreisland.bandcamp.com/track/seasonal-thaw

C12

https://soundcloud.com/open-planrecording-studio/opr-ultralux-c-12-tc-popint-to

251
https://soundcloud.com/open-planrecording-studio/opr-ultralux-251-tc-popint-to

Here is what they sound like up against an Apex 460 with modded circuit board. Pay attention to the 3d transients and extra Air on the p to p Versions!

Point to point on acrylic
https://soundcloud.com/open-planrecording-studio/opr-251-ultralux-point-to

Apex PCB modded with the same components
https://soundcloud.com/open-planrecording-studio/opr-251-deluxe

Point to point on acrylic
https://soundcloud.com/open-planrecording-studio/c12-point-to-point

Apex PCB modded with the same componnents
https://soundcloud.com/open-planrecording-studio/c12-apex-pcb-mod

C12 physical layout and schematic

http://openplanrecording.files.wordpress.com/2013/06/akg-c12-schematic.pdf

9 pattern 251 schematic

OPR · Nov 28, 2013

NEW LOwer price!! 8)

e.oelberg · Nov 28, 2013

.........................................it's ok

OPR · Nov 28, 2013

e.oelberg · Nov 28, 2013

hei opr

I'm sorry, totally fine what you do. I didn't know the history of the project, just don't like so much the direction the place is moving too, the last year. But I guess it's a normal movement, get's bigger, more professional... its fine

OPR · Jan 20, 2014

Orders shipping!!

RuudNL · Jan 21, 2014

IMHO there is an error in the schematic with OPR_251 above it.
As drawn in the schematic, the signal from the rear diaphragm will never reach the grid...
I think the connections to the backplate and the front diaphragm should be reversed!
(Backplate connected to grid.)

OPR · Jan 21, 2014

Have you tried it RuudNL? ???
It's working fine over here...

Give it a go!!
But yes there is an error in that schematic in that C1 should come before R4 not after but this does not effect the polarization scheme.
so I'll remove the schematic until I get time to fix it.

OPR · Mar 27, 2014

All paid orders shipping. !!

OPR · Oct 28, 2014

Orders shipping

OPR · Nov 13, 2014

Posting to USA and Itay! 8) enjoy

OPR · Nov 26, 2014

Shipped to Turkey and Korea

Cheers
Mark

OPR · Dec 15, 2014

Here's a new Ep from a local Australian band that used my point to point 251 with Tim's CT12 on vocals I believe they also used my point to point C12 on drum overheads.
Enjoy!!

http://kalacoma.bandcamp.com/

OPR · Dec 16, 2014

Yet another single from another local Australian band Mayfair Kytes that also used my point to point 251 with Tim's CT12 on vocals I believe they also used my point to point C12 on drum overheads amongst other things.

Enjoy!!

http://wondercoreisland.bandcamp.com/track/seasonal-thaw

OPR · Jan 4, 2015

4 sets posting to Norway!! 8)

OPR · Feb 1, 2015

2 set's Shipped to the U-S of A 8)

trans4funks1 · Feb 6, 2015

I'm curious to see your 251 schematic as your circuit doesn't seem to match this schematic:

http://www.geocities.jp/dave_group_japan/elam2502.jpg

Where's R10 & R11 fom the AKG 251-E schematic?

It looks like the C4 on your layout illustration is hooked up to the plate of the tube?

It seems like it would be very helpful to have a schematic of the particular circuit you have in mind.

OPR · Feb 6, 2015

Hey Transfunk,
Not all of the naming system is the same at the Akg Schematic, see the build thread for details...

http://groupdiy.com/index.php?topic=54078.0

trans4funks1 · Feb 6, 2015

I'm familiar with the build page.

It seems like it would be very helpful to have a schematic of the particular circuit you have in mind.

OPR · Feb 6, 2015

Many people have built this mic with little need for a traditional schematic
Its pretty clear..what's your confusion?

C-12 and 251 Clone acrylic piont to point boards for Apex 460

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