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Author Topic: came across a 1974 u67 capsule  (Read 679 times)

Derek Samuel Reese

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Re: came across a 1974 u67 capsule
« Reply #15 on: January 09, 2021, 08:41:59 am »

Is it safe to assume that removing the lead wire could be a bad idea with the oxidation ?
I have this nightmare where I remove the lead wire and the membrane comes with it lol
and I scream nooooooooo.
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klaus

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Re: came across a 1974 u67 capsule
« Reply #16 on: January 09, 2021, 01:18:39 pm »

A simple way to reduce your anxiety:
Unsolder the two diaphragm lead-out wires at the end where they go into the head. That way, the original connection at the center of the diaphragm remains undisturbed.

Just make sure to shield the diaphragms during soldering (with a cloth, old credit card, etc.) to avoid splashing flux onto them.
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Klaus Heyne
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bits_ville

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Re: came across a 1974 u67 capsule
« Reply #17 on: January 10, 2021, 01:28:16 am »

An appropriately sized jewelers bag can be great for protecting the diaphragm from flux when soldering.
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Robert Miller

RuudNL

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Re: came across a 1974 u67 capsule
« Reply #18 on: January 10, 2021, 07:26:28 am »

IMHO it is never a good idea to remove the lead-out wires from a center terminated capsule, unless there is a very good reason to do this (and you know what you are doing.) Emphasis added by K.H.
Apart from the risk of a slipping screwdriver(!), there is also a risk of an uneven force on the membrane after re-attaching the lead-out wires again and fastening the center screw. The result can be 'wrinkles' in the membrane, when this is not done the proper way.
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Derek Samuel Reese

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Re: came across a 1974 u67 capsule
« Reply #19 on: January 10, 2021, 01:27:27 pm »

A jewelers bag ? Do you mean that small satin pouch ?
I think for soldering this I might do it the poor mans way, heating a flat head screwdriver and using the tip as a soldering iron and gently attach the wires
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klaus

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Re: came across a 1974 u67 capsule
« Reply #20 on: January 10, 2021, 02:13:14 pm »

That's NOT recommended.
That way, you would heat up way too much way too far from the object. Get a decent electronic solder station, learn how to properly solder (practice on something cheaper than a $1k capsule!), or give the job to someone who knows.
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Klaus Heyne
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RadarDoug2

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Re: came across a 1974 u67 capsule
« Reply #21 on: January 10, 2021, 02:37:05 pm »

I think for soldering this I might do it the poor mans way, heating a flat head screwdriver and using the tip as a soldering iron and gently attach the wires
Where on earth did you get that idea from? Thats one of the oddest things I have ever heard!
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Derek Samuel Reese

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Re: came across a 1974 u67 capsule
« Reply #22 on: January 11, 2021, 06:58:04 pm »

Because the heated screwdriver doesn't get nearly as hot as a soldering iron would to prevent the splashing if the solder.
The screwdriver gets just hot enough to melt the solder but never splashes.
It was just a thought but you all know whats best and I will certainly listen
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klaus

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Re: came across a 1974 u67 capsule
« Reply #23 on: January 11, 2021, 08:11:11 pm »

Not to belabor this, but you would be surprised how little heat the tip of an electronic soldering station actually distributes beyond the area it needs to heat up (the very point of precision soldering stations).

A screw driver would need to be heated up quite a bit, and over a large area, to overcome the heat sinking it presents to any heat applied.
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Klaus Heyne
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Derek Samuel Reese

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Re: came across a 1974 u67 capsule
« Reply #24 on: January 11, 2021, 08:53:57 pm »

I ordered a solder kit :-)
I really don't think I have the courage to do this.
I wish there was a way to test the sound of a capsule without having to solder but I know there isn't.
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bits_ville

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Re: came across a 1974 u67 capsule
« Reply #25 on: January 12, 2021, 03:08:45 pm »

If you're in the LA area, or SoCal, I'd be happy to help, else, find someone local to you who has some experience working on microphones, preferably Neumann mics. (there are some basic but idiosyncratic elements, like getting the capsule safely in and out of the basket, that require some experience)
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Robert Miller

Derek Samuel Reese

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Re: came across a 1974 u67 capsule
« Reply #26 on: January 13, 2021, 08:51:23 am »

I appreciate the offer :-) I’m in NYC.
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David Satz

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Re: came across a 1974 u67 capsule
« Reply #27 on: Today at 10:34:06 am »

Two things stand out to me about this deal.

[1] OF COURSE the seller says that it's a fantastic-sounding capsule. There's even a chance that he believes what he's telling you. But I don't think it's predictable whether you'll agree with him or not if you buy the capsule. You may have very different ideas of what you want the microphone to sound like. Then you'd have no return privilege, and the capsule might be hard for you to resell, for exactly the reasons you are hesitant to buy it--only more so (the next customer would have to wonder why you don't want to keep it).

[2] You really do face some risk by trying to install the capsule yourself. The capsule _head_ of the U 67 (and related models) was designed to be replaced as a unit by someone without special repair skills--but not the capsule within the head.

I actually used to repair hi-fi equipment for a living, decades ago, and I got to be pretty good with a soldering iron for everyday work on consumer stereo equipment. But I don't do my own repairs on microphones or tape recorders! I want someone with lots of specific experience to be responsible for that--preferably the manufacturer. For Neumann microphones in the NYC area (where I live, too), an excellent alternative to Sennheiser USA, should you want one, is Tom Onofrio (onofriothomas@sbcglobal.net).
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