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 on: September 19, 2021, 02:47:19 PM 
Started by maltesen - Last post by klaus
"curley" or wrinkled diaphragms are not uncommon with MG's PVC capsules (see some previous comments from owners on Gearslutz).

Wrinkling (if indeed that's what you have) usually does not happen with a quality capsule.
But no microphone company will be generous if it detects that the capsule head had been opened and the seal broken. Therefore it is even more a reason to send the mic to MG unopened, and ask for a courtesy capsule replacement.

 on: September 19, 2021, 06:17:33 AM 
Started by maltesen - Last post by maltesen
Hi Klaus.

Thanks for your reply!

At this moment I only suspect that the capsule is  "blown" because of what little I can see through the grill (Looks Curley), the way the sound "breaks down" like breath on a capsule.
And because we've had two other gefells that had the same problem.

The mic. is 20 years old, so I'm not worried about warranty..... I will probably ship it to MG anyway, but I'd like to diagnose a little myself ;-)

Best Regards

 on: September 18, 2021, 01:05:09 PM 
Started by arch801 - Last post by arch801
Yes indeed, I will want to outsource that!
Thanks so much for the clarification. I will be checking with some pro-audio friends in California that have dealt with this type of thing.

I also want to have the mic properly checked by someone trustworthy who knows what they are doing. I'll do some research on this forum to see if anyone has been mentioned stateside that could perhaps fill both of these roles. If you have anyone you send this type of business to stateside I'm all ears.

I can send the mic itself for a diagnostic of the component integrity and health, but if they can help calibrate the PSU as well, that would definitely be a bonus. In any case, when I find someone to calibrate the voltage I will point them your way, much obliged!

Thank you again so much for all your help, it is really amazing to have access to such a renown expert on these things.

 on: September 18, 2021, 11:33:50 AM 
Started by DanDan - Last post by DanDan

Rather than my own words, I hope it is OK to relay these.

This week our industry lost a giant. John L Sayers was a multiple ARIA award winning engineer and producer working on some of the biggest Australian records of our generation.
He would go on to be one of the foremost studio designers in the world and share his knowledge via his recording forum and website www.johnlsayers.com.
But more than all of these things and accolades he was my step dad.
R.I.P Dee Dee, you will be missed.  Sebastian Thomas

 on: September 17, 2021, 05:40:12 PM 
Started by Matt Ogaz - Last post by David Satz
Matt, the switch's contacts should certainly be kept clean, but I don't think a totally silent changeover between patterns should be expected with this type of microphone. I don't know of any "vintage" microphone that was designed specifically so that the pattern could be switched while the microphone was in the middle of picking up production sound. That just wasn't an expectation that the designers of that time sought to fulfill.

Each time you change switch positions, the DC converter disconnects one circuit branch from the rear membrane and connects a different one in its place. The switch physically breaks and makes contacts; current flows into the new branch and charges a capacitor via a resistor over a certain amount of time, and the back half of the capsule shifts its charge according to the new voltage being supplied to it via a high-value resistor.

It's straightforward, and by today's standards you might call it unsophisticated, since there's no filtering to remove switching transients or smooth the transitions. But I think that the recording engineer was expected to choose the microphone's pattern before starting a take, or between takes if an adjustment was necessary, and not during a take.

--best regards

 on: September 17, 2021, 01:51:04 PM 
Started by maltesen - Last post by klaus
Are you sure you want to pass on any MG warranty-legal or goodwill? The company is usually very good at this.
Besides: how do you know the capsule is defective if you cannot even see it, let alone test it?

 on: September 17, 2021, 01:49:03 PM 
Started by arch801 - Last post by klaus
You are already 3/4 there: a Neumann Nu67 power supply already includes the circuit to operate it with U.S. voltages.
All you need now is a studio tech who can properly calibrate the voltages (no, I will not recommend to do this yourself, given your marginal knowledge in the field. I have no interest promoting premature death by electrocution).

Have the studio tech call me, and I will advise how to set up your system.

 on: September 17, 2021, 08:43:47 AM 
Started by arch801 - Last post by arch801
Oh wow, okay that is all very interesting.

It's the stock NU67 with a European plug that I have. It's not the re-issue but it is the actual vintage Neumann power supply that came with the mic originally (both are in excellent condition miraculously). I want to extend the life of the original components as much as possible, so what in your opinion would be the most ideal long-lasting solution using the NU67 on a US power outlet?

I am a beginner when it comes to electrical engineering, so while I have soldered a couple of DIY modular synth kits, that's about the extent. I would probably send away for a professional to handle any type of soldering needed, so I would welcome any path that avoids that if possible. I am open to any suggestions you have.

Thank you so much for the advice!

 on: September 17, 2021, 05:40:29 AM 
Started by maltesen - Last post by maltesen
Hi there.

I suspect that my UMT800 has a faulty capsule, but I can't figure out how to dismantle it :o

Does anyone know how to get to the capsule?

Best Regards

 on: September 16, 2021, 02:02:43 PM 
Started by arch801 - Last post by klaus
The first question I have: what brand is the "European" power supply?
Because all Neumann supplies I am aware of have multi-taps for the line voltage.
And if it's a budget supply, don't even bother going down that road, because every U67 deserves a well-filtered, well-stabilized high-end supply*

The second issue of concern:
Using a step-up transformer may get you in the neighborhood of 210VDC/6.3VDC, but more than likely the voltages you will find will be off enough that it matters-
for tube life, capsule life, noise floor, distortion.

To correctly dial in the precise voltages, you will need a decent meter and soldering skills,
as high and low voltages are set with dropping resistors that need to be changed (not an issue with the heater voltage on NU67u, which have a trip pot).

* the new NU67V are terrific: they automatically seek the correct voltages, even after a tube change. No more voltage adjustments for life!

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