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 91 
 on: August 03, 2018, 07:16:57 pm 
Started by RuudNL - Last post by David Satz
I created the table that is in Brian Campbell's "Reply #1". It lists all the test parameters I could find in Neumann's InfoPool for microphones based on the K 67/87/870 capsule type. To my knowledge that's the only capsule type for which Neumann has built EQ into the amplifiers specifically to tailor the sound quality of the microphones, rather than simply to provide bandpass filtering--and that's why microphones such as the U 47 and U 89 were not included.

I think that the different design choices are interesting. Also, they should serve as a caution--for example, if you compare a U 87 with a U 67 or M 269 with the intention of hearing "the difference between tube sound and transistor sound" you will only fool yourself, and the table shows why.

BTW, Mr. Sattler's document was one of the sources for the table. It's listed as "docu0048.pdf" since that was its filename in the Neumann InfoPool.

--best regards

 92 
 on: August 03, 2018, 02:13:20 am 
Started by RuudNL - Last post by RuudNL
That is also an interesting one! Many thanks!
(I wasn't sure about the U47, it was a long time ago I saw it.)

 93 
 on: August 03, 2018, 12:00:41 am 
Started by RuudNL - Last post by uwe ret
Here is an older 'official' document for nearly all pre-1981 Neumann tube microphones and the first generation (T-powered 70-series FET series). Unfortunately it does not include the U47/U48...

 94 
 on: August 02, 2018, 01:49:44 pm 
Started by RuudNL - Last post by RuudNL
Yes that is the one! Thanks a million!!

 95 
 on: August 02, 2018, 11:27:11 am 
Started by RuudNL - Last post by Brian Campbell
This chart?

 96 
 on: August 02, 2018, 03:08:15 am 
Started by RuudNL - Last post by RuudNL
Some time ago, I found a document with an overview of the gain and de-emphasis of several Neumann microphones.
(The amplifier circuits.)
I am almost certain that it contained amongst others, the data of the U47, U87, U87ai and U89.
Unfortunately, it seems I can't find it anymore...
Who knows where to find this information?

 97 
 on: July 28, 2018, 01:03:52 am 
Started by klaus - Last post by gtoledo3
Very interesting, thanks for that response!

 98 
 on: July 28, 2018, 12:38:37 am 
Started by klaus - Last post by klaus
So, how do you test the diaphragm tension of an assembled capsule, or do you just listen empirically?
I listen.

Quote
It always seems a little circumspect to me to peg difference down to just that. Small differences in the size of holes in the backplate for instance, etc., could seemingly make as much difference in end frequency response.
I know it's the diaphragm tension, because once I relax an overly tight diaphragm, the capsule behaves and sounds just right. If it were something else, relaxing the diaphragm to levels of tension found in former times would not bring the capsule into compliance.

Quote
It also seems like low tension can be a bad thing... one of the first things to make a capsule sound bad, IMO, is low tension that starts to result in a capsule being overly sensitive to plosives.
Of course. I speculate that too many K870 were too close to that limit, so they were selected out and rejected, which cost the company too much money, which caused the company to increase diaphragm tension, which reduced the amount of rejects, but which made the capsules sound worse.

But what do I know? Could have just been a new tensioning weight they ordered that was off, or something else...

 99 
 on: July 27, 2018, 09:58:17 am 
Started by aremos - Last post by aremos
Of course we're all looking for Klaus's review! But have been using it for months now & it's really a great mic, to say the least & in it's own right. Is it exactly & a replica of V.1 (or 2)? We'll wait for Klaus on that aspect of it.

 100 
 on: July 27, 2018, 06:48:19 am 
Started by Mickeyrouse - Last post by gtoledo3
I notice that he states that his build uses dual backplates, like a 67.

I wonder if he’s making that part? Even a lot of supposed ck12 clones from Asia take an approach where they just modify k67 clone parts.

Makes me wonder if Heiserman’s k47 is doing a similar thing. Just taking k67 clone sub parts and making them into a “k47” (however that works). Sometimes makers that flirt with Asian sub parts will just tune a k67 to a lower tension and say “its like a k47 now!”.

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