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 on: March 26, 2019, 08:19:45 pm 
Started by klaus - Last post by uwe ret
053291 - K49      : dual-sided, (dual wires)  - currently used in M149 Tube
053223 - K47fet  : dual-sided, (single wire) - currently used in M147 Tube and U47 fet
514753 - K49fet  : one-sided, (single wire) - currently used in TLM149

 on: March 26, 2019, 10:16:48 am 
Started by klaus - Last post by Avgatzeblouz
Here is the info I gathered a few years back as I've been through the same process. I hope the parts number did not change :

053291 – K49 : dual-sided, both wires installed.
053223 -  K47fet : dual-sided, one wire installed.
514753 - K49FET  : one-sided.

Good luck !

 on: March 26, 2019, 07:35:11 am 
Started by mikezietsman - Last post by mikezietsman
This is gold. Thank you Kai and Klaus!

I now have multiple solutions (which I can try)

 on: March 26, 2019, 04:57:16 am 
Started by klaus - Last post by klaus
K47, K49, K47fet capsules are ok to use in a U47. The rest has either no rear center lead out wiring or no conductive sputtering on the rear diaphragm.

 on: March 26, 2019, 04:54:01 am 
Started by karlengel - Last post by klaus
Well, if the tension loss is significant enough that it's audible, it will show up as a noticeable deterioration in the frequency response, usually a loss of high end, and excessive muddiness.

 on: March 25, 2019, 09:30:59 pm 
Started by karlengel - Last post by karlengel
Thank you. Assuming I lack the tools and skills to be comfortable disassembling my mic(s) to be able to see wrinkles in the membrane, how does this problem tend to manifest to the ear?

 on: March 25, 2019, 09:00:02 pm 
Started by klaus - Last post by afterlifestudios
I’m looking to buy a new k47 k49 from Neumann for a tube u47.  I’m still unclear about the part numbers and the model numbers in relation to:
1. which ones have diaphragms on both sides for multipattern use?
2. which ones have been “selected” for best front to back matching?

Is there a chart/list somewhere?

I’ve been offered (in Canada) from Sennheiser:
K47 part no. 053292
Or K49 part no. 053291
No price difference.

Would either of the fet versions (k47fet, k49fet fit my purposes?
Are they routinely less expensive?

Or finally, should I avoid the current crop, and rather chase one down from some earlier “glory days” of k47/49 capsule making?

 on: March 25, 2019, 03:09:10 pm 
Started by mikezietsman - Last post by Kai
Best if the new pin is selected for a tight fit.
A bit of epoxy glue will do the rest if necessary.
Once it's soldered on the back, the pin cannot fall out anyway.

The new pin should have exactly 1.5mm working diameter.
Else it will NOT make reliable contact if it's smaller, or if it's bigger, it will bend the contacts in the "bottle", so it will no longer work with another head.

There are lots of connectors out there that can serve as donor.
Use one where the pins have a collar on the outside.

 on: March 25, 2019, 10:38:43 am 
Started by karlengel - Last post by klaus
Condenser mics are not quite as fragile as you fear. But the obvious primary candidate for possible damage is the capsule with its micron-thin membranes.

And there, at least from my observation, it is fairly safe to assume damage to the performance if you can see wrinkles in the membrane (from the capsule whip-lashing against the inside of the protective basket, or, in the case of some pencil condensers, from the membrane making contact with the edge of the mic's capsule housing).

In the latter example, you will not be able to see the damage to the diaphragm platelet, but you may be able to see a dent in the housing, which would be indicative of a major hit having taken place.

If no diaphragm wrinkles, or deformation in the housing, can be detected, assume everything is ok.

The larger question (and answer) to whether more subtle damage occurred after a fall is indeed careful listening. And here, I would not rely on comparing current sound to past recordings, as exact mic positioning is always hard to recreate, but I would trust my ears which will tell me if the sound is grossly off from my expectation of stock performance.

What helps with even more subtle changes over time: compare your mic to a healthy specimen of the same model.

 on: March 25, 2019, 10:22:26 am 
Started by mikezietsman - Last post by klaus
Thanks, Kai. Very thorough.

What you still might cover in your method #2:
* how the new pin is secured in the plastic (glue?)
* how a smaller diameter replacement pin will make sufficient contact with the original (larger
   diameter) female counterpart in the mic's amp

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