OFFICIAL ioaudio MK67 build and support thread

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Pip

Well-known member
Joined
Nov 17, 2004
Messages
632
Location
New York City
Pip said:
poctop said:
Pip said:
So finished the build and all powered up fine. Mic sounds great I think? What I mean is I have never really used a U67 before so have no comparison. My build is Beezkneez K6 capsule and Poctop PSU Board.

Here is the one thing I am not sure of. When I plug the mic into my preamp with the power off I get a buzz, nothing new for a tube mic, low but its there. then I power the mic on and all seems fine.  The ouput is a little low but nothing crazy. I am basing this on other mics in my possession and where the gain of my pre is. But when I kick in the pad the volume drops, a lot if you ask me.  The mic still works fine in all patterns etc...  But the buzz is now louder or I should say less masked. What might be wrong.

I have triple checked my grounding while listening to the mic all is as quiet as I can get it.  I have quadruple checked my wiring.  All my voltages are spot on and I have tried multiple tubes. Again the mic sounds fine but I really think I might have a problem. Is it possible C10 is hosed somehow?

Hi Pip , For the psu parts i am glad everything is right on , i have implemented a SHLF jumper to gnd lift the cable shield
you can try to remove it as it is on by definition ,
Best,
Dan,

Thanks but I will try it but I don't think thats  it. Alas I see a long trouble shooting session in my future. All components seem to check out in circuit next I will start to deconstruct and check all solder joints etc...

Sorry to quote myself but it seemed the easiest way to keep this a thread.

So all is good. It turns out that my test mic pre had developed a problem. Argh! I guess its always good to test your test kit eh?! Don't know what it is yet but switched to another of the same units as I own two and bingo problem gone. I also want to stress that I made double sure that the body sleeve was on correctly and that it was tight and making good contact. This mic was very agitated by close proximity to my soldering station!

Beesneez K6 sounds awesome! But I wonder if Chunger will make those Delrin spacers available as I need one too?

 

maq3396

Well-known member
Joined
Mar 20, 2013
Messages
158
Hi Chunger

Thanks for another great build guide!

I just want to clarify something before building myself into a deep hole.

You show a green wire that comes from the C1-C10 juncture of the HiZ portion and say that for direct wiring only one wire is needed but for turret builds two are required.

The remainder of the build pics show two wires- one to the switches and one to the capsule (as does the build illustration).

Am I correct in using the double green wires regardless of turret use or not?

Thanks
Mac
 

maq3396

Well-known member
Joined
Mar 20, 2013
Messages
158
For those of us that aren't fortunate enough to have a Shaggy in the neighborhood here is a 3D printed extension that performs a similar job to the 8mm delrin spacer used in Chunger's build.

I used a 3 x 8mm set screw to hold the printed part onto the rubber mount as a suitable length single bolt was not available. It works fine but a single screw would be desirable.

Cheers
Mac
 

sebastianzet

New member
Joined
Jun 25, 2012
Messages
4
Is there a place where i can just buy the COMPLETE kit all at once? it looks really confusing to buy all of the parts
 

mica

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Joined
Apr 20, 2010
Messages
134
Location
Denmark
(NEWBIE ALERT)
So i made this build a couple of years ago and got it out of the basement recently to try it on some vocals.
It was quite noisy so i started by checking B+ voltage and it's 218V at the lowest setting on the 25K pot with the mic connected. I think i made all the corrections in the original guide, but how can i get the voltage down to 210V, and could the high voltage be the source of the noise?

EDIT: I can see i jumped R5 to get the voltage up from 205V to 201V originally. Maybe that was a mistake? Should i just put the R5 resistor back and can the voltage at B+ change over time?

Pic of the PSU:
http://soundz.dk/u67psu.jpg

Thanks to anyone who can get this baby back on track.

/Michael
 
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