| View previous topic :: View next topic |
| Author |
Message |
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
 Posted: Tue Aug 02, 2011 3:43 am Post subject: Oktava MK-319 hum |
  |
|
I have two Oktava MK-319's that I have modified. I took the metal grill out the head basket, added a nylon mesh in it's place and felt strips down the inside left and right sides of the head basket. I also disconnected the HP filter/-10db switch, added some caulking to the body, and took the black baffle off the capsule. I put it all back together and now there is a 50 hz hum on both mics thats almost as loud as talking into it. When I take the head basket off the hum is even louder!
I soldered the capsule center conductor to ground and the capsule signal wire to the input coupling cap. As a test on one of the mics I reversed it where the capsule center conductor went to the input coupling cap and the capsule signal wire went to the ground but it didn't make a difference. Still picked up sound but the 50 hz hum is there.
I'm stumped, any help would be much appreciated, I wanna get these babies up and going again!
_________________
My musical endeavors!
Label: http://www.dyspepsidisc.com/
Band: http://www.stationaryodyssey.com
Studio:Mother Brain Sound Infrastructure |
|
| Back to top |
|
 |
Nate Dort
tinnitus
Joined: 08 Mar 2004
Posts: 1030
Location: Denver
|
|
| Back to top |
|
|
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
|
| Back to top |
|
|
HeavyHand
takin' a dinner break
Joined: 08 Apr 2008
Posts: 156
Location: Philadelphia, PA
|
|
| Back to top |
|
|
A.David.MacKinnon
resurrected
Joined: 07 May 2003
Posts: 2420
Location: Toronto
|
| Posted: Tue Aug 02, 2011 8:07 pm Post subject: Re: Oktava MK-319 hum |
|
|
He won't work on mics that have been modded by the owner (or anyone other than him).
_________________
Dave
http://adavidmackinnon.blogspot.com
http://adavidmackinnon.bandcamp.com
| fossiltooth wrote: | | The few people who are able to create genuinely new sounds are often insane-psycho-geniuses and the mentally retarded. |
|
|
| Back to top |
|
|
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
|
| Back to top |
|
|
Snarl 12/8
moves faders with mind
Joined: 20 Dec 2008
Posts: 2708
Location: Portland
|
| Posted: Tue Aug 02, 2011 9:18 pm Post subject: Re: Oktava MK-319 hum |
|
|
If you're not going to get the official replacement part you're just going to have to try stuff and see. You're trying to create a little Faraday Cage around the capsule. The size of the holes determines what frequencies it will block. 50Hz waves are pretty big, so I think anything meshy and conductive would work. Make sure you ground the fuck out of it. Google Faraday Cage to get specifics. The bigger the holes the more sound you'll let through and the less internal reflections you'll have too. The whole purpose of doing the mod.
ck
_________________
Carl Keil |
|
| Back to top |
|
|
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
| Posted: Tue Aug 02, 2011 9:39 pm Post subject: Re: Oktava MK-319 hum |
|
|
I'm not opposed to getting the official parts at all. I've been googling MK-319 head basket or MK-319 replacement mesh etc.. but coming up short. I think I'll experiment tonight with some metal mesh. I'll take a little internal reflections over a 50hz hum any day.
_________________
My musical endeavors!
Label: http://www.dyspepsidisc.com/
Band: http://www.stationaryodyssey.com
Studio:Mother Brain Sound Infrastructure
Last edited by Brett Siler on Wed Aug 03, 2011 1:14 am; edited 1 time in total |
|
| Back to top |
|
|
Scodiddly
TOMB Moderator
Joined: 10 Dec 2003
Posts: 3153
Location: Libertyville, IL, USA
|
| Posted: Tue Aug 02, 2011 11:10 pm Post subject: Re: Oktava MK-319 hum |
|
|
| Just hit the hardware store for some kind of mesh. I'm not sure the heavy grounding is all that necessary, as long as the mesh forms a basket shape around the capsule. My mics mostly just have the mesh touching the insides of the headbasket and there's no hum issues. |
|
| Back to top |
|
|
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
|
| Back to top |
|
|
Nate Dort
tinnitus
Joined: 08 Mar 2004
Posts: 1030
Location: Denver
|
|
| Back to top |
|
|
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
| Posted: Fri Aug 05, 2011 7:17 pm Post subject: Re: Oktava MK-319 hum |
|
|
Ok I got some mesh and my attempt to solder it on to the head basket ended in failure and frustration. I could not get the solder to stick! I might order this stuff called Wire Glue, which is some electrically conductive glue and give it one more shot.
If worse comes to worse I did contact an Oktava distrobuter and could order new headbaskets for $50 a pop. A little more than I wanna spend but thats the risk you take with this sort of stuff I suppose...
Also Mr. Joly said he could sell me some Floating Dome headbaskets for $75 each which is another thing to consider....
_________________
My musical endeavors!
Label: http://www.dyspepsidisc.com/
Band: http://www.stationaryodyssey.com
Studio:Mother Brain Sound Infrastructure |
|
| Back to top |
|
|
A.David.MacKinnon
resurrected
Joined: 07 May 2003
Posts: 2420
Location: Toronto
|
| Posted: Fri Aug 05, 2011 7:20 pm Post subject: Re: Oktava MK-319 hum |
|
|
Try scuffing up the area with sandpaper, coating with a liberal amount of flux and using a very hot iron. A 30-50 watt might do the job.
_________________
Dave
http://adavidmackinnon.blogspot.com
http://adavidmackinnon.bandcamp.com
| fossiltooth wrote: | | The few people who are able to create genuinely new sounds are often insane-psycho-geniuses and the mentally retarded. |
|
|
| Back to top |
|
|
Brett Siler
resurrected
Joined: 05 Dec 2003
Posts: 2340
Location: Evansville, IN
|
|
| Back to top |
|
|
wretchasketch
audio school
Joined: 13 Sep 2011
Posts: 1
Location: Lewisburg, TN
|
| Posted: Tue Sep 13, 2011 8:01 am Post subject: Re: Oktava MK-319 hum |
|
|
| Nate Dort wrote: | | You need the metal grille. It's metal for a reason: shielding. It also needs to be securely (and conductively) connected to the body, usually through soldering. |
Makes sense. I've been reading all I can about modifications common to this mic including removal of that inner mesh and either damping or replacement of the head basket. How do the pro mod guys who remove the inner mesh deal with this issue? |
|
| Back to top |
|
|
|
