Topic: Schoeps MK41 Cap Repair - Where? Pic Included

[Datfly]

This MK41 was a little hard to thread on my new KCY Clone from followingbob and I found the show that was recorded has slight static in one channel.
I decided to reverse the caps to see if it was the cap or the cable & when I carefully unscrewed the cap it fell apart.

Where can I get it fixed? Anyone here on the board? Off to Schoeps? If so how do I go about that?

Thanks for any help.
Datfly

[aaronji]

I may be mistaken, but I think you have to send them back to Germany for the authorized repair.  Either directly or through your distributor...

[yug du nord]

This MK41 was a little hard to thread on my new KCY Clone from followingbob and I found the show that was recorded has slight static in one channel.
I decided to reverse the caps to see if it was the cap or the cable & when I carefully unscrewed the cap it fell apart.

Where can I get it fixed? Anyone here on the board? Off to Schoeps? If so how do I go about that?

Thanks for any help.
Datfly

yikes.

[noahbickart]

Don't worry. Call Redding audio:

Redding Audio, LLC
101 N Plains Industrial Road
Building 4
Wallingford, CT 06492
Phone: (203) 269-1808
Fax: (203) 269-1810

E-mail: sales@reddingaudio.com

They are the USA authorized distributors. They will handle sending it to Schoeps for you. If you wait until they send a whole bunch of stuff if won't cost you anything to ship. If you want to speed it up you can pay extra for rush service.

Schoeps repairs everything they've ever made, and any product that is still in production they guarantee to fix it for the estimate. It shouldn't be too expensive.

Since you have to do this, you might as well send all your other schoeps stuff in...

I had a mk6 repaired recently, cost $250 after all was through. And that's a complicated thing they don't even make anymore.

You should be fine. Call redding today.

[acidjack]

yikes.

yup

[schoepsnbox]

Send it off to me and I will fix it for you..

[NOLAfishwater]

is this a result of over tightening and the center pin broke?

[StuStu]

As Noahbickart suggested above, call Redding. Hopefully your repair doesn't cost too much.

[it-goes-to-eleven]

I have never seen that type of failure reported on TS.  Over tightening the capsule could never cause this.

Contamination of the capsule interior, and the parts that are touching that fabric and have touched fingers, are very serious concerns.  You have touched those parts so they are now contaminated.  Cleaning them is not trivial.  They need to go to Redding, and likely Germany.  In the meantime, I would put them in separate plastic bags.

[it-goes-to-eleven]

This MK41 was a little hard to thread on my new KCY Clone from followingbob and I found the show that was recorded has slight static in one channel.

How hard was it to thread on?  I assume you mean it was hard to turn?  Did it turn easy and then become hard to turn near the end?

Edit: This is one of the reasons why I am not rushing my active products to market.

[hi and lo]

Contamination of the capsule interior, and the parts that are touching that fabric and have touched fingers, are very serious concerns.  You have touched those parts so they are now contaminated.  Cleaning them is not trivial.  They need to go to Redding, and likely Germany.  In the meantime, I would put them in separate plastic bags.

I have to second this advice; sending them back to the factory for authorized service is the only recommended solution as servicing them is not trivial. Potential contamination should absolutely be a concern and even a fingerprint can negatively affect the high-impedance signal paths involved. There might be other repair factors, some being trade secrets, that can only be done correctly by Schoeps. For example, does the torque on the retainer ring when reassembled affect performance? Even if you knew what the torque should be, you might not have the proper tools for measurement. Only the factory can assess the repairs needed and perform them correctly.

[noahbickart]

My comment above and now is not in any way meant to demean the work of schoepsnbox, who has done amazing work for our community for a long time,

But...

Given how cheap and relatively quickly a fully authorized repair can be done via redding, I think to do otherwise is foolish.

[F.O.Bean]

My comment above and now is not in any way meant to demean the work of schoepsnbox, who has done amazing work for our community for a long time,

But...

Given how cheap and relatively quickly a fully authorized repair can be done via redding, I think to do otherwise is foolish.

100% agreed!

[noahbickart]

Also you'll get the cool new printed serial numbers.

[F.O.Bean]

Also you'll get the cool new printed serial numbers.

True

[kingkita]

Redding audio maybe able to fix it in house,but I had a bad experience last year with a 41v cap was lose they fixed it then bent the shit out of it in the process so it ended up going to schoeps to get fixed correct.I would also take pictures of it before you ship it to them.

[OOK]

This MK41 was a little hard to thread on my new KCY Clone from followingbob and I found the show that was recorded has slight static in one channel.
I decided to reverse the caps to see if it was the cap or the cable & when I carefully unscrewed the cap it fell apart.

HHmmm this doesn't sound good....  Hopefully the KCY clone didn't cause this.

[edtyre]

This MK41 was a little hard to thread on my new KCY Clone from followingbob and I found the show that was recorded has slight static in one channel.
I decided to reverse the caps to see if it was the cap or the cable & when I carefully unscrewed the cap it fell apart.

HHmmm this doesn't sound good....  Hopefully the KCY clone didn't cause this.

Or maybe it's just a 30 year old capsule that broke.

[JasonR]

Or maybe it's just a 30 year old capsule that broke.

That's my thinking as well.  It's at least half that age, though I'm not exactly sure when Schoeps switched the design on their assembly retaining clip.  This is the old style which wasn't used on my caps from ~ '99, so it's older than that.  These ones open easily with the proper tool, as I suspect the newer design does as well... I just no no clue what that tool would be for the newer ones.

Having opened and cleaned caps like the one pictured, I would have no fear in sending it to Nick for a quick fix.  While some of us believe that Schoeps microphones produce magical results, they do not contain magic pixie dust.  More often, they do contain conventional dust and debris that can be safely blown out.  I'm not sure exactly what failed on this cap, but it looks like the center pin was pulled free of whatever retaining clip is supposed to hold it in place.  In that Nick and FollowingBob are working together providing these cables, his offer to take a look seems like a customer service courtesy worth considering.  At worst, the cap will be on the next boat to Germany.

[it-goes-to-eleven]

Having opened and cleaned caps like the one pictured

Please post the serial numbers of those caps so I know to never, ever buy them.

Thanks!

[JasonR]

Having opened and cleaned caps like the one pictured

Please post the serial numbers of those caps so I know to never, ever buy them.

Funny... it was actually at the urging of a Yard Sale buyer here who is very happy with his cap.  I realize this may not be for the faint of heart, and I wouldn't have attempted it blindly.  But with an old cap that was in obvious need of a cleaning of the vent screen, I was comfortable attempting it, surprised by the simplicity of the design, and pleased with the results.  Pretty much every other cap I've owned has the newer style retaining clip which probably requires a special tool to open, and fortunately I haven't had the need.

If Nick is comfortable doing the repair, it's probably something he can handle, and it sounds like good customer service to me.  If Nick can't handle it, or if Datfly is more comfortable with only Schoeps going inside his MK41, then it's off to Germany for it.  All I'm saying is that I don't believe this repair will be complicated, and if it is, the option to send it back to the homeland remains.

[DSatz]

As some people here know, I've been friends with, and have done translating and editorial work for, people at Schoeps for over 30 years. Twice during the past three or four years, including this past May when I was in Karlsruhe, I've had lengthy sit-down sessions in which I've disassembled and reassembled capsules under the guidance of their former chief engineer. But even with that "training"--really just an introduction--I would never open any of my own capsules, let alone anyone else's.

The capsules that I took apart couldn't possibly meet factory specs after I put them back together. This is because, in addition to the knowledge, coordination and concentration that's required (and that I don't always have), there are some real trade secrets involved in assembling a Schoeps capsule correctly. I know exactly one such secret--how a tiny marking on one internal part is used for aligning another internal part in order to get the lowest distortion in one particular type of capsule--but I also know that there are others that I don't know about.

Electronic as well as physical/mechanical tests are also done on capsules during assembly. The equipment that they use isn't unique, but the tests that are performed, and when and how they are performed and the expected result values and the allowable tolerances, etc., are never shared outside the company. That's not because the tests are mysterious, but on the contrary--it's because anyone with a physics background would understand all too well if they had those details.

Schoeps isn't alone in this by any means. Today no manufacturer can afford to make it easy for others to reverse-engineer their products. There isn't much mystery left about microphone circuitry; by now, the Schoeps circuit has been copied by any number of Chinese clone manufacturers. That leaves the capsules as the thing that can't be copied, even if all the pieces are imitated precisely.

So, with all due respect to those who may disagree, my honest advice is to send any capsules back to the factory if you think they need work or even just checking and cleaning. I own about 30 Schoeps capsules at this point, and I keep track of when I bought each of them, and cycle them through factory service every 15 years or so--even though I've only had actual repair-type issues with capsules that I've bought second-hand, or the two times when I've dropped a capsule and wanted it to be checked carefully.

--best regards

[John Willett]

As some people here know, I've been friends with, and have done translating and editorial work for, people at Schoeps for over 30 years. Twice during the past three or four years, including this past May when I was in Karlsruhe, I've had lengthy sit-down sessions in which I've disassembled and reassembled capsules under the guidance of their former chief engineer. But even with that "training"--really just an introduction--I would never open any of my own capsules, let alone anyone else's.

The capsules that I took apart couldn't possibly meet factory specs after I put them back together. This is because, in addition to the knowledge, coordination and concentration that's required (and that I don't always have), there are some real trade secrets involved in assembling a Schoeps capsule correctly. I know exactly one such secret--how a tiny marking on one internal part is used for aligning another internal part in order to get the lowest distortion in one particular type of capsule--but I also know that there are others that I don't know about.

Electronic as well as physical/mechanical tests are also done on capsules during assembly. The equipment that they use isn't unique, but the tests that are performed, and when and how they are performed and the expected result values and the allowable tolerances, etc., are never shared outside the company. That's not because the tests are mysterious, but on the contrary--it's because anyone with a physics background would understand all too well if they had those details.

Schoeps isn't alone in this by any means. Today no manufacturer can afford to make it easy for others to reverse-engineer their products. There isn't much mystery left about microphone circuitry; by now, the Schoeps circuit has been copied by any number of Chinese clone manufacturers. That leaves the capsules as the thing that can't be copied, even if all the pieces are imitated precisely.

So, with all due respect to those who may disagree, my honest advice is to send any capsules back to the factory if you think they need work or even just checking and cleaning. I own about 30 Schoeps capsules at this point, and I keep track of when I bought each of them, and cycle them through factory service every 15 years or so--even though I've only had actual repair-type issues with capsules that I've bought second-hand, or the two times when I've dropped a capsule and wanted it to be checked carefully.

--best regards

Absolutely correct - I would never let anyone touch any of my microphones except the manufacturer themselves - or their certified engineer in an official distributor.

I agree with everything DSatz says.

[it-goes-to-eleven]

Funny... it was actually at the urging of a Yard Sale buyer here who is very happy with his cap.  I realize this may not be for the faint of heart, and I wouldn't have attempted it blindly.  But with an old cap that was in obvious need of a cleaning of the vent screen, I was comfortable attempting it, surprised by the simplicity of the design, and pleased with the results.  Pretty much every other cap I've owned has the newer style retaining clip which probably requires a special tool to open, and fortunately I haven't had the need.

If Nick is comfortable doing the repair, it's probably something he can handle, and it sounds like good customer service to me.  If Nick can't handle it, or if Datfly is more comfortable with only Schoeps going inside his MK41, then it's off to Germany for it.  All I'm saying is that I don't believe this repair will be complicated, and if it is, the option to send it back to the homeland remains.

I am still very curious abut this.

What solvent do you use to remove the contamination that results from any contact?
Do you have an instrument that measures gigaohm impedances accurately?

[Datfly]

Thanks for everyones input and comments.
I have the answer I was looking for and I will take it from there.

Datfly