K67 Capsule clone reskining improvement?

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gearhunter

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Sep 7, 2016
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Hi all,

At the moment I have a 34mm K67 797 Audio Capsule in a D-87 build but has suffered humidity from the last owner and needs a reskin.

Would be worth sending the capsule to Mr. Thiersch for reskining? Or reskin only isn’t sufficient to make an improvement and get the response a bit closer to the original Neumann?

Would the result differ much from the usual mid-priced capsule offerings from the market?

Thank you!
 

soliloqueen

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the difference in treble response is from the lack of spacing groove on the faces I think. changes the air volume behind the diaphragm a bit. reskinning won't improve anything, but it's a pretty nice capsule overall.
 

kingkorg

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Hi all,

At the moment I have a 34mm K67 797 Audio Capsule in a D-87 build but has suffered humidity from the last owner and needs a reskin.

Would be worth sending the capsule to Mr. Thiersch for reskining? Or reskin only isn’t sufficient to make an improvement and get the response a bit closer to the original Neumann?

Would the result differ much from the usual mid-priced capsule offerings from the market?

Thank you!
Last time i checked Thiersch wouldn't fix 3rd party capsules, only originals. Reskin wouldn't get you anywhere anyways.

The difference is in backplates as mentioned above. Some knowledgeable people consider those 737s to be improvement to the Neumann design.

More of the high end is a good thing, as you get to use higher value feedback cap and get rid of more of the high end ,which results in less noise in u87 and u 67 designs.

The shape of the response curve and off axis response is what counts, and these capsules have that nailed. There is simply more low and high end. That is easily compensated with EQ and the end result is exactly the same as using darker capsule.

I've had no issues making these sound exactly as u87 in the past. Managed to fool a proffesional mastering engineer who couldn't distinguish between his own vintage u87 and 797 diy project.

Additionaly, those capsules can be disassembled and cleaned as the diaphragm is glued to the ring. So humidity shouldn't be an issue, if the diaphragms aren't damaged phisicaly.
 
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gearhunter

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Sep 7, 2016
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Thank you all for the responses! I'll be getting another 797 K67 separately to replace the one I have and use 400-680pF feedback cap as KingKorg sugestes. On the other hand, what can I do to compensate the low end and aproximate it more to the original?
 
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kingkorg

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Make sure you order CY002 model from 797 audio. It is the one with Philips screws.

It would be helpful to post the schematic you are using. It's just another cap you need to adjust.
 

gearhunter

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Barcelona, Spain
Sorry for the confusion. I decided to leave the CY002 for another build and order a Takstar CTS-2 and a CTS-4 for now. Being 1dB less bright, is 400pf feedback cap the best option?

I contacted them and they tell me that the lead content of copper parts is higher than that of 1000ppm for the samples and if is it acceptable for me. If not they will have to make arrangement. Would that be sufficient enough for a quality sample?
For the PCB I used Poctop's D-87 Tapered version. Does this can be used as the schematic to find the other capacitor value?

Thank you !!

58d1402a02163.jpg
 
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