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 21 
 on: September 08, 2021, 09:39:11 AM 
Started by Matt Ogaz - Last post by Kai
Snip the wire bridge "Br" - http://recordinghacks.com/pdf/akg/C414EB-service-doc.pdf) to activate phantom power on both mics and report back.

That bridge needs to be cut to reduce current consumption in these mics, down to a level that can be handled by phantom supplies.
The wire bridge, visible on the first set of your pictures, connects the upper (red wire) and center stand-off columns on the far right side of the circuit board (lower column has a black wire connection).
In the right pictured mic the red wire is soldered wrong.
It should go to the upper post, not the middle.

This doesn’t matter as long as the wirebridge Br is in place.
Once you cut the bridge this mic won’t work as intended any more.


If the noise doesn‘t go away, my major suspects are the bigger sized Tantalum Electrolytic capacitors, The bigger blue and green ones in the right picture.
These have a significant tendency to fail.
Very carefully handle the polarity when replacing.

 22 
 on: September 07, 2021, 11:02:12 AM 
Started by Ernie Black - Last post by denbrown1990
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 23 
 on: September 07, 2021, 02:35:49 AM 
Started by Matt Ogaz - Last post by klaus
Snip the wire bridge "Br" - http://recordinghacks.com/pdf/akg/C414EB-service-doc.pdf) to activate phantom power on both mics and report back.

That bridge needs to be cut to reduce current consumption in these mics, down to a level that can be handled by phantom supplies.
The wire bridge, visible on the first set of your pictures, connects the upper (red wire) and center stand-off columns on the far right side of the circuit board (lower column has a black wire connection).

 24 
 on: September 06, 2021, 11:40:20 PM 
Started by Matt Ogaz - Last post by Matt Ogaz
I have two Silver AKG C414EB's with Teflon capsules.  One of them has a noise floor 4 or 5db higher than the other one.  The level of noise is not affected by the low cut or pad switches.   They sound the same aside from the elevated noise floor in one mic, output levels are within 1 or 2 db of each other.  The noisy mic appears to be a different revision than the other, some of the cable routing to the capsule and switches is different, among other things.

I noticed that when I switch from cardioid or fig-8 to omni on the quieter mic, I get a  slight increase in noise that quickly drops back to normal level.  When I do this with the noisy mic, the noise level instead drops much lower for several seconds  before coming back up.  During this time when the noise goes away the mic is outputting audio and sounds normal.

I have read elsewhere that noise like this can be caused by a noisy jFet or bipolar transistor in the amplifier and I should replace those.  Does this sound likely?  Thanks for any insight you can offer.

The offending noisy mic is on the right in the photos.

 25 
 on: August 26, 2021, 12:33:34 AM 
Started by Ernie Black - Last post by Ernie Black
We're pleased to report that the forum was successfully migrated to its new home this evening and was only in maintenance for about 25 minutes.

Thanks for your patience!

IMPORTANT NOTICE

We will be upgrading the PSW forums server, commencing Tuesday October 23 at 1 am. The purpose of this upgrade is to increase server memory, RAM, and output. Over the past day, we have experienced temporary outage as the server ran out of available memory; this also occurred briefly in September. We will be adding 100 GB of memory, plus bumping the RAM from 12 to 16 GB and increasing output to 6000 Mb/s. The forums may be unavailable for up to three hours (although we expect a shorter timeframe).

Thank you.

 26 
 on: August 26, 2021, 12:33:09 AM 
Started by Ernie Black - Last post by Ernie Black
We're pleased to report that the forum was successfully migrated to its new home this evening and was only in maintenance for about 25 minutes.

Thanks for your patience!

 27 
 on: August 25, 2021, 11:19:06 AM 
Started by Ernie Black - Last post by Ernie Black
Commencing at midnight tonight (August 26, 12:01 am EDT), we will be implementing a server upgrade to improve performance and address server requirements. We expect a a service interruption of 1 - 2 hours and are targeting this time slot as the most inactive time for most of our members. As the forums are globally accessed, we cannot make the hours convenient for everyone, but this seems to be the best time. Remember, this will be midnight between Wednesday and Thursday, with minimal downtime between midnight to 2am.


 28 
 on: August 22, 2021, 04:59:33 PM 
Started by PaulGasztold - Last post by Scully Fan
Hello Paul

What position do you have the filter switched to?

The reason why I ask is that the built-in high frequency tilt is often mitigated by having the HPF switched completely out when working the mic that close and taking advantage of the proximity effect. You still have intelligibility with the benefit of a bit of low end girth.

Other than that, a foam wind screen and peak limiting usually soften enough of the stridence to make things workable.

Good luck!

 29 
 on: August 22, 2021, 10:25:14 AM 
Started by PaulGasztold - Last post by PaulGasztold
I am using an AKG 535.  I want to reduce the high frequencies above 7k by about -3db.

To remove the exaggerated high end of this mic to flatten the upper frequency response ( or cut everything off about 6 or 7k ).

Ideally
- BEFORE signal reaches the mixer, preamp or a/d converter
- that maintains high quality signal, albeit darker


I am imagining passive solutions such as:

- adding lots of foam
or
- a passive device or filter I can plug XLR into? 
or
- an inexpensive mic mod that any experienced local tech can do


Application is vocal 1-3 inches from mic.  Normally I go into Logic and monitor post eq which is a fine solution.  But sometimes I do live streams or zoom online and I don't have control over signal.
 
Does anyone have a suggestion other than changing the mic?

Thank you for considering


Paul

WEEKEND WARRIOR

 30 
 on: August 20, 2021, 04:11:03 PM 
Started by Donn - Last post by David Satz
E = export = XLR
C = continental = Tuchel (back then)
L = Lemo for the ÖRF (Austrian national broadcasting network)

which could be combined with:
B = bass control (low-cut switch)

so EB = microphone with XLR output and low-cut switch

452 = 451 with one resistor different, so that current draw at 48 Volts would be somewhat reduced (it was about 5.5 mA for the C 451, back when the DIN standard was still 2 mA maximum). However, as a result the 452 requires 48 Volt powering, whereas the 451 could accept 9 - 52 Volts. And even the 452 required ca. 3 mA. Back then, AKG and Schoeps' Colette system were like "outlaws" until the DIN standard was revised to allow a maximum of 10 mA/microphone at 48 Volts.

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