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 21 
 on: January 21, 2022, 11:30:40 AM 
Started by Vertigorecording - Last post by soapfoot
Under current law they do have that right, and it's probably reasonable that they retain it (even if I don't like it or agree with the reasoning).

It's also reasonable, in my view, that customers retain the right to assess for themselves whether they're capable of carrying out a repair (on a product they own, using replacement parts they buy). Many people would botch their first brake job, too--but we can all go to AutoZone, buy pads and rotors, and give it a go.

I find the view that companies are "protecting us from ourselves" to be needlessly paternalistic, particularly when there's no risk of bodily injury. Manufacturers of smart phones and automobiles are increasingly adopting that view, and I don't see it as an improvement for the end user. The ability to carry out small repairs with proper instructions isn't exceedingly rare.

Replacing the capsule in a U87 requires a couple of solder connections, a clean space, and a lot of care. I succeeded on my first try and have done it multiple times since. Much easier, in my view, than replacing brake pads and rotors!

 22 
 on: January 21, 2022, 12:20:01 AM 
Started by Vertigorecording - Last post by David Satz
If I understand Neumann's decades-long position on this--they sell complete capsule heads (Kapselkopf = "KK"), which are modular and field-replaceable by a typical recording engineer using reasonable care. Studios and broadcast organizations that use dozens of Neumann microphones could reasonably keep a few of each type of capsule head on hand, so that a session need not be interrupted for long in the event of a failure. Other leading manufacturers have long done this as well for at least some of their professionally-oriented products. And as far as I'm aware there's been no change in Neumann's policy about selling capsule heads to any customer who wants to buy one (someone please tell me if I'm wrong about that).

The actual capsule (Kapsel = "K"), however, isn't field-replaceable in any manufacturer's professional condenser microphones that I know of. In Neumann's small-diaphragm microphones the capsule isn't replaceable even on a repair bench--not even by Neumann themselves! If you send Neumann a KM 84 or 184 for repair and the capsule proves to be defective, a new complete capsule head is the only remedy that they offer. Such is the level of modularity that they've designed into that class of product for a variety of reasons. With Neumann's large-diaphragm microphones the capsule itself can be replaced, saving you considerable expense. But to do so requires a repair environment, plus skills and knowledge that a typical recording engineer can't be assumed to have. Most recording engineers I know don't use soldering irons regularly or skillfully if at all.

So you may well have a "right to repair" a product that you buy--but if you lack the skills, knowledge and equipment and you botch the job, you can't hold the manufacturer responsible. Sometimes reasonable care means not doing it yourself, even though you wish you could. I'm not a lawyer, but I believe that manufacturers are within their rights to be cautious about who they sell certain repair parts to, when they know from hard experience that those parts can't be installed properly by many customers. Some would even say that they have a duty to avoid implying that "just anyone" can install those parts properly.

I can also understand very well their being cautious when they know that some of those parts aren't being used for repairs at all, but as key, value-enhancing components in competing products. Since Neumann is by choice a manufacturer and seller of condenser microphones, not a commodity parts manufacturer, as I see it they have a right to choose not to be in that business.

 23 
 on: January 19, 2022, 07:05:54 PM 
Started by RuudNL - Last post by houser
Thank you very much for your kind reply. Will check!

 24 
 on: January 19, 2022, 06:54:33 PM 
Started by Vertigorecording - Last post by ilcaccillo
Did you purchase and have you received the capsule?

No I didn't order it in the end, because a simple cleaning fixed the K49 capsule we had.
But I could have ordered if I wanted, the distributor was just waiting for my decision whether to order.

Description was "T3-053291 - K49 microphone capsule"

 25 
 on: January 19, 2022, 02:30:16 PM 
Started by afterlifestudios - Last post by klaus
Good to know that this was a Neumann-generated document.
Still, as I wrote, for best performance and tube longevity, I'd calibrate the voltages to the specs I mentioned, especially since the price explosion of NOS low-noise-selected EF86.

 26 
 on: January 19, 2022, 02:25:24 PM 
Started by RuudNL - Last post by klaus
Your model year uses stark-white plastic nipples.
Here is a link: https://www.ebay.com/itm/401413037539

 27 
 on: January 19, 2022, 11:59:51 AM 
Started by RuudNL - Last post by houser
 I am also attempting to repair the -10db switch on an U87AI 1998.

Is there any chance someone here could sell me or point to a few centimetres of the dark yellow 1mm plastic rod
that is required to repair this? I have spent hours looking for this and would truly appreciate it!

If not could someone suggest a link on the internet by any chance please?
Would truly appreciate it! Many thanks

 28 
 on: January 18, 2022, 10:17:28 PM 
Started by afterlifestudios - Last post by afterlifestudios
As an aside: It is strange that in this document they say "plate voltage 210vdc" because as Klaus points out earlier in the thread it is the B+ that is 210VDC, not the plate voltage. The plate voltage for the ef86 of around 75V, and  is derived from this B+ voltage.

 29 
 on: January 18, 2022, 09:20:23 PM 
Started by afterlifestudios - Last post by ilcaccillo
I am not sure where you saw the 2% range fo B+ for U67.

Hi Klaus,
thanks for your message.

The 210V 2% it's stated in different Neumann documents for the U67,
I think I saw it in at least 2 different Neumann U67 documents, I can only find one of them right now as unfortunately I don't have my backup hardrive with me at the moment.





you can find it in this manual:
http://recordinghacks.com/pdf/neumann/U67-manual-1992.pdf

 30 
 on: January 17, 2022, 11:52:04 PM 
Started by afterlifestudios - Last post by klaus
Could you please explain why you recommended adjusting the heater voltage to 6,2V at the tube and not 6,3V.
I know the difference would be insignificant, but why 6,2V and not 6,3V?

I typically adjust to between 6.1 and 6.2VDC - a bit lower than the 6.3VDC the tube is rated for.
Through experience I found that the closer you get to the nominal voltage, the more the tube is stressed and its life shortened, even if just insignificantly so. 

Quote
Neumann specs are 210VDC 2% and not " 2 volts".
So 2% will be a tolerance from 205,8V to 214,2V

Was your recommended "2 volts" a typo or do you prefer to follow a different tolerance for B+ than Neumann?

Not a typo. I am not sure where you saw the 2% range fo B+ for U67. But if you were to follow that tolerance, you would have too much of a gap between noise floor increase (205VDC) and polarization stress/distortion on the capsule (214VDC). And that is quite audible, so I prefer to really  stick closely to the voltage that provides the 60VDC polarization voltage the U67 capsule and most Neumann LD capsules are designed to operate under.

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