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Author Topic: Neumann reissues the U67  (Read 14404 times)

Online aremos

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Re: Neumann reissues the U67
« Reply #60 on: May 23, 2018, 01:43:08 pm »
Now you have 2 power supplies and can switch to find out if the problem follows the microphone or the PSU -  if the problem reappears at all.
Does this problem show up when you plug the PSU into a certain wall outlet or use a certain power cable?

The same issue occurred one month apart, in the exact same way, with completely different units!
It's as if both mics (along with a different PS, different mic cable, different PS cable) had to go through some type of "settling in"?
All of a sudden, after powering up for the first time & 1.5-2 hours of working perfectly & sounding fine, the same hum started emitting & no signal being able to be recorded. After shut-off (1/2 hour) & then powering up again the mics have been working fine.

The odds of this happening only to me must be astronomical, unless it's something common. Hence why am asking & very curious if it's happened to anyone else.

Offline klaus

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Re: Neumann reissues the U67
« Reply #61 on: May 23, 2018, 01:58:30 pm »
When I will review the mic (as soon as VK has a spare to send me), I will look at this issue.

My suspicion: it's the same issue I had once with an M150 power supply of similar construction: A Chinese-made AC-DC converter is embedded in the supply, similar to what a wall wart does, and it shut down (a type of circuit breaker senses overheating or other maladies) until it recovered. I replaced the converter (a third-party item that can be found on eBay) and the problem never reoccured.

Have you checked the AC at the plug where you connect the power supply?
Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Online aremos

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Re: Neumann reissues the U67
« Reply #62 on: May 23, 2018, 05:18:47 pm »
...
Have you checked the AC at the plug where you connect the power supply?

Yes. Haven't had any problem with anything else plugged into it (including a C-800G & REDD mics).

Offline klaus

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Re: Neumann reissues the U67
« Reply #63 on: May 24, 2018, 03:11:05 am »
I meant the voltage coming out of the wall.
Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Offline brucekaphan

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Re: Neumann reissues the U67
« Reply #64 on: June 29, 2018, 06:33:21 pm »
Is Klaus' U67 reissue review still forthcoming, or has he done it already and somehow I missed it?

Offline klaus

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Re: Neumann reissues the U67
« Reply #65 on: June 29, 2018, 07:15:59 pm »
Bruce,
It's forthcoming, in about a week. Lots of surprises, too!
Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Offline brucekaphan

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Re: Neumann reissues the U67
« Reply #66 on: June 30, 2018, 06:40:27 am »
Thanks, Klaus! Excellent news!

Offline RuudNL

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Re: Neumann reissues the U67
« Reply #67 on: June 30, 2018, 08:51:53 am »
Looking forward to read about the "surprises"!

Online ratite

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Re: Neumann reissues the U67
« Reply #68 on: July 07, 2018, 07:56:15 am »
C'mon Klaus out with it!

Online aremos

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Re: Neumann reissues the U67
« Reply #69 on: July 09, 2018, 11:37:39 am »
C'mon Klaus out with it!

Klaus,
Please take your time. As we'd want something well done - meticulous & thorough.

Offline klaus

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Re: Neumann reissues the U67
« Reply #70 on: July 09, 2018, 03:20:31 pm »
Writing, writing, writing...
Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Online aremos

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Re: Neumann reissues the U67
« Reply #71 on: July 10, 2018, 10:32:30 am »
In the vox of Gomer Pyle:

"Surprise, surprise, surprise" ... with pictures?

Offline klaus

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Re: Neumann reissues the U67
« Reply #72 on: July 10, 2018, 01:24:49 pm »
Of course, with close-ups!
Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Offline Deuce 225

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Re: Neumann reissues the U67
« Reply #73 on: July 24, 2018, 06:59:38 pm »
Our U67 originally came from Belgium and the transformer is strapped for 200 ohms.  My understanding is that provides 6db more output. I am looking forward to reading Klaus's upcoming review.

Tim Cochran

www.tracehorse.com

Offline RuudNL

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Re: Neumann reissues the U67
« Reply #74 on: July 27, 2018, 03:53:35 am »
U67 reissue: to buy, or not to buy, that's the question!
(I hope to know more after reading the review.)