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 1 
 on: May 25, 2017, 11:21:02 pm 
Started by alrettich - Last post by Michael O.
I see the Hear Technologies Hearback system around a lot and it does the trick, though not too cheaply. The other one I often see is Aviom, which has a slightly better build quality but is even more expensive.

Sorry it took a month to get your reply, but I hope this helps.

 2 
 on: May 25, 2017, 04:53:24 pm 
Started by Mikeyod - Last post by radardoug
I think you are onto something there. Pin 6 of IC3 should go high with slowing down, that would be correct.
But if pin 6 IC4 is already high, it would indicate that stage is trying too hard, and then runs out of steam. So the problem is following IC4. Try R48, the zener D8 (sus), and Q10.

 3 
 on: May 25, 2017, 11:13:00 am 
Started by Mikeyod - Last post by Mikeyod
Hi Doug,
Did you see these last two posts ? Were you able to learn anything from the card your client sent about this issue ?

Still trying to figure this one out too !!    : 0)

Mike

 4 
 on: May 25, 2017, 10:55:00 am 
Started by RuudNL - Last post by boz6906
Uwe, thanks for the clarification!

In general terms, what were the changes?


 5 
 on: May 25, 2017, 09:20:59 am 
Started by klaus - Last post by GroverChang
Indeed, writing an essay is not an easy work and you sometimes you just don't have time to do it properly... Thereby, just buy an essay and make your life much more simple!

 6 
 on: May 24, 2017, 03:29:35 pm 
Started by RuudNL - Last post by uwe ret
The SM69fet  and USM69 circuits are very different from each other! The USM69  uses essentially the same circuit (twice) as the U89, albeit a different and larger dual diaphragm capsule.  To the best of my knowledge the circuit used in the SM69fet is unique and not used in any other Neumann microphone.

 7 
 on: May 24, 2017, 11:13:53 am 
Started by RuudNL - Last post by boz6906
It's been my understanding the SM69fet and USM69 are electrically identical, except for remote pattern switching.

"The USM 69 is a 69 fet special version having the pattern's knobs on the mic body, so this mic is not remptely controllable.The mic body is a bit larger."

http://www.neumann.com/forums/view.php?bn=neumann_archive&key=991052248&v=f

IME, the USM hi freq pre-emphasis is useful in most situations  My USM69 is an original 1979 01 version so it may have more low freq response than current units.

Regarding sound propagation in air, losses at 8kHz are about 8x higher relative to 2kHz.

https://en.wikibooks.org/wiki/Engineering_Acoustics/Outdoor_Sound_Propagation

 8 
 on: May 24, 2017, 08:48:23 am 
Started by RuudNL - Last post by David Satz
This thread reads as if some people in it are confusing the SM 69fet (with remote pattern switching) with the USM 69 (pattern switches on the mike). They're different animals circuit-wise, though neither model has built-in high-frequency de-emphasis like in the U 67 or 87.

This failure to smooth out the high end has been justified on the basis of the greater typical recording distance as compared to normal studio microphones. But generally if more "presence" is desired in a directional microphone, a response elevation in the midrange/upper midrange would be called for--not a rise an octave higher. Having owned both types of microphone, I found that for many purposes (especially recording in spaces with walls made of hard materials, e.g. stone churches) the SM 69 and USM 69 were simply too bright, even harsh sounding, without some treble reduction in post.

 9 
 on: May 23, 2017, 04:32:44 pm 
Started by RuudNL - Last post by boz6906
Martin didn't state the capsules were the same, his comment addressed the circuit.


Klaus has said: "You cannot use a U87 capsule in an SM69, fet or tube. The capsule in the SM69 (fet and tube) is interchangeable with the U67/M269 capsule, and bears the same identifier: K67/870"






 10 
 on: May 23, 2017, 03:34:33 pm 
Started by RuudNL - Last post by RuudNL
I have the schematics of both of them and I have serviced many SM69 and U89 microphones.
From a viewpoint of construction there is no similarity.
The U89 uses an edge terminated capsule, the SM89 has a capsule with a center screw.
Maybe he means the functionality is the same. (Multipattern etc.)
But that is all I can think of...

By the way: I am talking about an SM69, not an USM69.
But the USM69 also has a capsule with a center screw, the U89 hasn't.

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