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 on: December 02, 2022, 07:05:10 PM 
Started by brucekaphan - Last post by Kai
Cable microphonics of the type you describe usually origin from the screen litz wires have become brittle and broke over the decades.

I can‘t comment on the sound, but functionally I don’t see a problem using the Gotham cable.
The only thing to watch for is, when changing the length of a tube mic cable, the heater voltage needs to be re-adjusted.
Measurement is done on the mic side BTW.

A bit of under-voltage (longer cable) is less critical than any over-voltage.
Therefore, running a tube mic with varying cables is a bit uncomfortable.

The only source for the 7-pin Large Tuchel plugs are specialists shops and the used market.

The plug is simply called Large Tuchel 7-pin, the one with the thin round pins.
The number is Tuchel (HF) T-3468 (male) and (HF) T-3469 (female) or (HF) NT-3469 (female with swivel stand mount).
A version without HF shield is T-3460 and T-3461 / NT-3461 (swivel).
The HF shield is of minor importance, an active cellphone close to the mic will spill into it any way.

I’ve never seen the version with the larger squared pins (like used in the U-47) in a 7-pin variant, only 3- and 6-pin, so Large Tuchel 7-pin should be the key information.

 on: December 02, 2022, 05:13:53 PM 
Started by brucekaphan - Last post by brucekaphan
This post is essentially a continuation of a tangent thread that evolved within Klaus' M49V evaluation; I didn't want to further distract from the focus of that post, so I'm starting a new one here.

I own a Neumann M249 that Klaus dated at "1964-1965." I recently noticed (by random chance) that the last eight feet of the mic to power supply cable (on the microphone end) was microphonic when handled—when not being handled the cable worked beautifully, but since cables can sometimes be jostled during recording, I didn't want to continue to risk ruining a recording so I decided to cut the offending cable off and re-terminate. My studio is small so I'll never miss that 8' of cable in my room. Following Klaus' detailed instruction on termination, the cable is now working beautifully—microphonics are gone.  However, if I find myself working in other studios, I'm likely to want a longer cable. A few years ago, for a different mic, I purchased a good supply of Gotham 20102 (751) cable—I have plenty left over to build a longer cable. It's double-reussen, and with slight differences in hues, the internal wires follow the same color code and at least appear to be the same gauge as the original Doerffler cable. I'm thinking that on a rainy day, I'd like to build the spare (longer cable).  Does anyone have any thoughts/feelings comparing the original Doerffler to this Gotham cable? Is this Gotham cable as close as I'll be able to come with contemporary cable, to matching quality with the original Doerffler?

Equally pertinent: if I build a spare cable, I'm going to need the appropriate Tuchel 7 pin connectors. Can anyone tell me if these are still being built and if so, where can I find a contemporary source for these? Of course in pursuit of either new contemporary or old stock, it would also be useful to know the actual name or model number for these connectors...

Any help would be appreciated!


 on: December 01, 2022, 02:55:27 PM 
Started by klaus - Last post by klaus
"But this guy (...) invented the very microphone that I use as a musician," West added. "You can’t say out loud that this person never did anything good and I’m done with that, I'm done with the classifications, and every human being has value that they brought to the table, especially Hitler."

There you have it.
West uttered this nonsense on "Infowars" whose host, Alex Jones, was recently convicted to pay $1 billion in a defamation lawsuit. He might have lacked the knowledge to set Mr. Ye straight.

So, for the record:
Hitler did not invent the condenser microphone technology that Kanye West uses in his rap recordings. But Hitler's propaganda henchmen recognized the superior sensitivity and frequency fidelity of the then-new Neumann CMV3 to complement and enhance newly developed Körting, AEG and Siemens ELA loudspeaker arrays, the latter coordinated and integrated by Telefunken, and used them in large Nazi propaganda events.

In a fresh, provocative documentary about Hitler, there is a chapter which goes into some detail how the regime used the new microphone technology to full advantage:

 on: November 30, 2022, 02:07:27 PM 
Started by klaus - Last post by brucekaphan
A couple of days ago, I took Klaus up on the invitation he posted in this thread to phone him for his advice on reasons why the cable for my M249 might be microphonic.

We had a predictably informative and interesting conversation. If I understood him correctly, Klaus explained in detail that if the cable was the original Doerffler cable (rather thick, dark grey, no graphics), and if the cable had been well maintained (no pinching under closed doors, etc.), and if the cable was properly terminated, there was no good reason to think that the cable shouldn't be perfectly functional, even though in all likelihood the cable is approximately 58 years old.

Based on its appearance and experience with other Neumann mics from the '60s, I believe the cable is the original Doerffler. Klaus said that off the top of his head he wasn't 100% certain, but for a properly terminated cable, he thought he remembered that for the M249, the center pin (I later saw in schematics online that this is considered to be "Pin 7") should be tied to Pin 3, and that both of these should be tied to the shell of both connectors connectors.

Though my German is sorely lacking, I sought out schematics online and to the best of my ability verified that Klaus was right about the assignment of ground to pins 3, 7, and connector shells. Using my ohm meter, I tested these connections, and all connections were solid. Klaus said that if the termination was properly done, the next thing to suspect was that at some point, the cable might have been pinched, disrupting the shield. Following his recommendation, I carefully ran the cable through my fingers, trying to find physical evidence of such a disruption. I couldn't see or feel any damage to the exterior of the cable, and didn't feel any anomalies underneath the jacket of the cable.

The first time I noticed the cable being microphonic, it was when I was testing the microphone after it had returned from repair at Tom Onofrio's shop. I didn't bother to put the mic on a stand—I was holding it in my hands. I can't remember ever having done that before, so the microphone cable had always been stationary, fed along a mic stand, and even now, with the cable having proven itself microphonic when handled, it still doesn't present a problem when the cable is stationary.

I don't like the idea of there being even a small possibility that a good take could be marred by a singer or player moving around a mic and the cable reacting noisily, so after exhausting the suggestions that Klaus had given me, I powered up the mic, ran it through some headphones and once again carefully ran the cable through my fingers. I held one end of the cable still with one hand, and twisted and pinched the other side of the cable with my other hand. Sure enough, at approximately eight feet away from the microphone end, the cable was microphonic in the same way I had noticed the one time I had hand-held the mic. The other twenty or so feet of cable are dead quiet. My studio is small, so it's a no brainer to lose the eight microphonic feet at some point in the near future.

Thank you Klaus for the instructive and helpful phone conversation. I hope this post pays your kindness forward.

 on: November 28, 2022, 08:42:23 AM 
Started by Keiton - Last post by Keiton
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 on: November 28, 2022, 06:48:33 AM 
Started by jamesbarns - Last post by jamesbarns
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 on: November 28, 2022, 06:43:28 AM 
Started by jamesbarns - Last post by jamesbarns
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 on: November 26, 2022, 08:38:16 PM 
Started by klaus - Last post by Timtape
 I'm not sure if it was consistent even within one company but here's an example of the type of graph I was thinking of:


 on: November 25, 2022, 04:08:09 PM 
Started by klaus - Last post by klaus
Can you share which mic companies include graphs based on realistic operating conditions?

 on: November 25, 2022, 01:55:33 PM 
Started by Keiton - Last post by toranrt
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