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[aremos]

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.

[klaus]

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?

[aremos]

...
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).

[klaus]

I meant the voltage coming out of the wall.

[brucekaphan]

Is Klaus' U67 reissue review still forthcoming, or has he done it already and somehow I missed it?

[klaus]

Bruce,
It's forthcoming, in about a week. Lots of surprises, too!

[brucekaphan]

Thanks, Klaus! Excellent news!

[RuudNL]

Looking forward to read about the "surprises"!

[ratite]

C'mon Klaus out with it!

[aremos]

C'mon Klaus out with it!

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

[klaus]

Writing, writing, writing...

[aremos]

In the vox of Gomer Pyle:

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

[klaus]

Of course, with close-ups!

[Deuce 225]

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

[RuudNL]

U67 reissue: to buy, or not to buy, that's the question!
(I hope to know more after reading the review.)