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 1 
 on: September 25, 2022, 03:06:14 PM 
Started by Vertigorecording - Last post by Vertigorecording
Vertigorecording  -  thank you for the details on the McMaster Carr part number. After a year of use, do you find that the 30A durometer still provides enough stiffness to support the amp unit/capsule in the correct position when you hang the mic upside down?  I just installed the 30A and found that it would sag enough to let the capsule get very very close to the top of the grill.  I'm considering trying 40A.  I still have the original rubber support ring and it suffered the same issue (that's why I'm trying to replace it) The original material is much stiffer than the 1/8" - 30A sheet from McMaster Carr.

Good question, I don't actually own the mic but that is a concern!

 2 
 on: September 24, 2022, 03:51:29 PM 
Started by Vertigorecording - Last post by shirk
#protips

Thanks, Klaus!

 3 
 on: September 24, 2022, 11:27:45 AM 
Started by Ubermunch - Last post by klaus
You can plug a modern KK67 head onto a vintage U67. The only thing you need to do is either cut off the ground pin in the head or, more elegantly, drill a small hole into the head board where the ground pin of the head would go (it's already marked with a slightly different surface color in the head board).

You can buy the KK67/KK870 head assembly with or without basket from Neumann.

 4 
 on: September 24, 2022, 11:20:26 AM 
Started by Vertigorecording - Last post by klaus
Alternative: buy the part for the new M49V from Neumann. It is identical with the original in fit and quality.

 5 
 on: September 24, 2022, 09:53:42 AM 
Started by Vertigorecording - Last post by shirk
Vertigorecording  -  thank you for the details on the McMaster Carr part number. After a year of use, do you find that the 30A durometer still provides enough stiffness to support the amp unit/capsule in the correct position when you hang the mic upside down?  I just installed the 30A and found that it would sag enough to let the capsule get very very close to the top of the grill.  I'm considering trying 40A.  I still have the original rubber support ring and it suffered the same issue (that's why I'm trying to replace it) The original material is much stiffer than the 1/8" - 30A sheet from McMaster Carr. 

 6 
 on: September 24, 2022, 05:12:01 AM 
Started by Ubermunch - Last post by Ubermunch
I was told by the great  Tom Onofrio  they are interchangeable. I have some other K67 capsules that I would like to have in the mix. If they are interchangeable, I could swap the head baskets for  a different K67 capsule  and get a different sound.
I am wondering if Neumann will sell these (minus the capsule), and how much one would cost?   



Also, off topic a wee bit down the chain, ,, has anyone any experience with the Buzz audio essence on clean ish electric guitar ?  Is it an LA3a Mach  II with its added  side chain functions ?   

 7 
 on: September 22, 2022, 12:11:43 PM 
Started by ilcaccillo - Last post by klaus
As there is a high quality screw-in, German-made substitution available for NG filtering, the value of the power supply will not suffer as a consequence of replacing filter caps.

If one suspects failure, a simple test is to remove one lead of each of the five capacitors, put it on a capacitance meter and check overall capacity.
if any of them falls below the rated capacitance (47mfd) replace.

 8 
 on: September 22, 2022, 10:35:40 AM 
Started by ilcaccillo - Last post by RuudNL
The only thing I can add to the discussion about replacing capacitors in microphone power supplies, is that I have replaced the capacitors in a couple of U47 (VF14) power supplies.
These power supplies had developed a significant mains hum, caused by the leak currents of the capacitors.
With the new capacitors, the microphone output is totally hum free now!
(And yes, I agree that you shouldn't replace things just for the sake of replacing them.)

 9 
 on: September 21, 2022, 01:24:40 PM 
Started by ilcaccillo - Last post by klaus
1. As a friendly reminder: only real posters who identify themselves with their real name are allowed to post here.
"Il Caccillo" does not sound like a real name to me. I apologize should I be wrong and indeed names like that are printed in passports.

2. What have you actually learned from the responses you received? It seem to me that you ended up where you started out: replace what seem perfectly fine filter caps in a vintage collector's item worth now thousands of dollars, possibly reduced in value by these alterations.

Again, please correct me if I got this wrong, but were these exchanges over the last month worth the time and space they occupy?

 10 
 on: September 21, 2022, 11:38:52 AM 
Started by ilcaccillo - Last post by ilcaccillo
To say this clear:
I don’t usually fix stuff that is not broken.

I understand and I do the same.
Although a PSU Electrolytic capacitor from 1960 might work and not seem to present problems it will be out of specs after 60 years,
and will not perform better than a new, modern and high quality Electrolytic capacitor, so even do it's not completly broken I don't personally see any reason for not Re-Capping the PSU and replacing the 60/50 years old Electrolytic capacitors.
It's cheap enough and then you can be sure that the Lytic Caps are performing 100% and have much lower ESR than the very old caps.
This is my personal view, it will never make the PSU worse, it will be the same or better.


Broken for me means there’s a real problem with the mic, not just a component has “out of specs” measurements by today’s measures.

In the PSU “out of specs measurements by today’s measures" is a good enough reason to replace them

Thank you for your input Kai

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