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 on: September 17, 2017, 12:40:43 pm 
Started by mu90r - Last post by klaus
The capsule in the first two pictures is not a genuine Neumann capsule, but most likely a Thiersch Blue Line (PVC diaphragms).

It cannot be determined from the photos whether this capsule is a new M7 copy capsule manufactured entirely from scratch, or whether new diaphragms were mounted on an original Neumann M7. Thiersch offers both services.

In either case, do not expect genuine Neumann sound from such a capsule.

 on: September 17, 2017, 07:33:18 am 
Started by klaus - Last post by mu90r
I have seen the valve # 129 VF14M on this page.
Maybe, you should ask the owner where the valve came from ....


 on: September 17, 2017, 05:31:58 am 
Started by mu90r - Last post by mu90r
By the way ...
This is the old capsule that probably can not be revived.

 on: September 17, 2017, 05:01:55 am 
Started by Kultivator - Last post by Kultivator
Thanks Klaus.
Before I read your answer I disconnected the DC board, and then the voltages popped up to 29v(from 10) when I measure red-black, white-black over the transformer.

When you say "Disconnect the feed from the transformer to the mic amp (red and black wire)" is that the wires on top of the board? Ive got 2 red wires and 2 black wires going to the pad and low-cut switches.

 on: September 17, 2017, 04:58:09 am 
Started by mu90r - Last post by mu90r
I wish not to be a cause of annoyance, but without their collaboration I am not able to distinguish this capsule.
I have the opportunity to buy ...
Sadly I only have 2 photos.
Looks like a real Neumann M7?

 on: September 16, 2017, 05:21:49 pm 
Started by Kultivator - Last post by klaus
You need to isolate the two sections of the mic amp- audio processor and DC converter section to determine where the short or voltage drain is located.

Disconnect the feed from the transformer to the mic amp (red and black wire), while keeping the DC converter connection intact.

If the polarization voltages still measure low, even when fed directly from B+ and bypassing any issues on the mic amp board, you know it is one of the components on the DC board.

If that is the case: I often find that tantalum capacitors deteriorate with time and short out. I would start with replacing them.

 on: September 16, 2017, 10:46:58 am 
Started by Kultivator - Last post by Kultivator
Hi, Im having trouble with my C414 EB, it has very low output but passes sound. Ive opened it up and checked the voltages on the DC converter card and Im way off. Where it should be -60v , +60v , -20v I have -11v, +11v, -0,1v. Ive got 9v at the zenerdiod like it is supposed to.
Ive replaced the 10uf tantalum on the DC converter card with a 15uf I had lying around but no difference.

Does anyone know what voltage should be sent to the DC converter card, Voltage between the red and black wires? So I can try to locate where my problem is, if its the dc-converter card or something earlier in the circuit.

I read in some other thread that it could be the output transformer thats broken, Im told the phantom power  goes thru the transformer.
Please help!
Greetings from Stockholm.

 on: September 16, 2017, 10:29:58 am 
Started by Gabor A. Erdelyi - Last post by klaus
Glad to have you reach out to others for an answer. The forum is widely read in Europe, and I hope your quest will yield the information and good outcome you are looking for.

 on: September 16, 2017, 09:43:02 am 
Started by Gabor A. Erdelyi - Last post by Gabor A. Erdelyi
Sorry guys for taking your time. I have some serious problem with Schaal Audio in Germany. :-(

Half year ago, on 10th March I sent him an M49 Decca modded mic, to have it built back to the original tube circuitry. I also sent two new AC701K and prepaid him fully for the job.

In the beginning he was communicating, and finally promised to ship me the finished mic six weeks ago. And nothing happened. He does not reply my emails (I sent 10 mails in the last six weeks), and not answering the phone for me.

Do you have any recent experience with him? What can be the problem, has he closed his shop maybe? I'm worried about my expensive M49 and the money of course, not mentioning the two AC701K... Please drop me a reply if you might have any idea.

Thanks to all!

 on: September 15, 2017, 03:21:29 pm 
Started by mu90r - Last post by klaus
All agreed, except for #2. K67, old or new, do not belong in U47.

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