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 91 
 on: March 30, 2017, 07:44:58 pm 
Started by Recording Engineer - Last post by Recording Engineer
With the KM 53 aging capsule, what's the next best alternative to yet another aging capsule? As a side note, I own no KM 53s... Yet! :)

And not necessarily related to the KM 53, what's every's favorite omni mic manufactured today when you don't have a KM 53?

 92 
 on: March 30, 2017, 04:51:09 pm 
Started by Recording Engineer - Last post by Recording Engineer
Well thank you to all the replies... I will report back if the rattle does indeed stop once properly-mounted; though it'll probably be another couple of months.

Boz, no product info or website... IOAudio is just a one-guy operation of Max Kircher as far as I know. His popular MK-47 is sold through 939 Studio and him with his contact info on GroupDIY.. I bought just the transformer directly. If this is indeed the design, I would have thought I'd seen a concern expressed somewhere by now... No thang at all if it goes away as was told though... We'll see!

 93 
 on: March 30, 2017, 02:46:57 pm 
Started by AusTex64 - Last post by Kai
... difference in sound between the two capsules...The Gefell shows a 5db lift in the high frequencies, which is clearly audible ...So does Neumann tame the capsule HF rise with the buffer?
There is no filter built into the KM54 amp I did err on this, see post below . It's easy to tame the HF response with proper capsule construction. E.g. a little less distance from diaphragm to backplate increases sensitivity and reduces the relative HF level. There are other ways to do this too.
Sound wise, I've never heard the Gefell, but the Neumann KM54 is slightly on the soft side. It does not have the airyness of the later KM84.

 94 
 on: March 30, 2017, 10:04:50 am 
Started by Mikeyod - Last post by Mikeyod
Yes, all of those caps have been replaced.
I tried running the machine from cold with the auto-locator unplugged to see if this could help narrow it down but the same result. After half hour it cleared up. I'm assuming something is warming up then functioning properly ?
   Could the LY4 contactor be a cause of this ? Looking at Mouser to see if it is still available.

Mike

 95 
 on: March 29, 2017, 06:40:57 pm 
Started by Mikeyod - Last post by radardoug
Have you replaced the Frako caps on the cards in the card frame? They will probably start smoking soon if you haven't! I had an A80 with speed problems, this cured it. But I still have a problem with 30 ips I haven't sorted.

 96 
 on: March 29, 2017, 01:41:36 pm 
Started by Recording Engineer - Last post by klaus
Though I now have egg on my face that does not wash off easily (my ignorant comments regarding "magnetostriction"), I am on firm ground with this part of your inquiry:

Nothing should ever rattle inside a microphone, regardless of type or brand, because such rattling is invariably transmitted to the mic's output as audible noise. 

If a transformer rattles in its installed position inside a mic, it is defective, and unsuitable to work as intended.

 97 
 on: March 29, 2017, 12:32:25 pm 
Started by Recording Engineer - Last post by boz6906
From my experience you want ZERO mechanicsl noise from any part, especially in a high-gain mic preamp.  High quality audio transformers like UTC are even 'potted' to prenent mechanical movement.

I would hesitate to say your transformer is defective, the mounting scheme may somehow clamp the transformer to prevent the rattle.

Do you have a website or product info about this transformer from the manufacturer you can share?

 98 
 on: March 29, 2017, 10:22:22 am 
Started by AusTex64 - Last post by AusTex64
Esa,

Thansk for the link. I had forgotten about that discussion. I must be getting old...

I am wondering about the difference in sound between the two capsules. I have looked at the frequency response plots for KM54 and Gefell MV691 with M94. The Gefell shows a 5db lift in the high frequencies, which is clearly audible when recording stringed instruments, which is my primary use for these mics. KM54 plot is much more flat in the high frequencies. So does Neumann tame the capsule HF rise with the buffer?

I still need to do a side by side comparison with KM54 and my tube modified Gefells.

 99 
 on: March 29, 2017, 04:45:58 am 
Started by AusTex64 - Last post by panman
We did discuss that before here: http://repforums.prosoundweb.com/index.php/topic,36984.msg535981.html#msg535981

All the age/quality issues aside, the only meaningfull difference is the backplate-holes. I can only speak from the older ones, but to my knowledge the current M94-backplates are ceramic and may have other differencies too.

 100 
 on: March 28, 2017, 10:41:44 pm 
Started by AusTex64 - Last post by AusTex64
What exactly are the differences between Neumann KK54 and Gefell M94? I have not had opportunity to study both. Thanks!

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