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Neumann U67 Clone : D-U67 Tube Microphone Build Thread.
« on: September 29, 2012, 03:25:12 PM »
D-U67 Build Thread

Let's get those Electron flowing.
All of the info: http://www.groupdiy.com/index.php?topic=49675.0

The D-U67 Tube Mic


Check this First: Project Files for The D-U67 Build   :)
http://db.tt/1E3Yk9Hg

The Safety Manual and Considerations.http://db.tt/EdCZFL1P

D-U67 Mic Parts: http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=83ad963d23
Note: BOM include 56R For R20

D-U67 PSU Parts : http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=b5c122b4d0      
Note: BOM include 560R for R9

Important Note
The only 2 parts that is not (Europe 230V) compatible is the hammond 20VAC and the PSU pilot Lamp wich is 120V everything else is fine except the fuse will need to be 0.1A instead of a 0.2A for north America, you will need a minimun 6VA traffo for the filament side,
alternative part number are discussed in this thread here :
http://www.groupdiy.com/index.php?topic=49675.20
http://www.groupdiy.com/index.php?topic=49675.40





Errata Feedback winding polarity  http://groupdiy.com/index.php?topic=50021.800 reply # 814

AMI T67 Corrected Wiring to main microphone pcb

From transformer board to mic PCB

Pad 5 ----->  mic pcb pad T1212
Pad 12 -------> mic pcb pad T55
Pad 1 --------> mic pcb pad T44
Pad 4 --------> mic pcb pad T11
Pad 7 --------> mic pcb pad T1010
Pad 10 ------> mic pcb Pad T77




here is the Classical Series at AMI specsheet for the BV12 classic series,
https://dl.dropboxusercontent.com/u/43869772/U67/BV12.pdf

See here for complete relationship between pad and transfomer on the AMI mic pcb,
http://groupdiy.com/index.php?topic=50021.msg720336#msg720336


BOM Annexe
http://dl.dropbox.com/u/43869772/U67/Picture%20Tron/Info%20D-U67.DOC



Not inclued in the Mouser Bom are:
  • Switches for Switch board.
  • 1X 270pf Styroflex/630V
  • 1X FeedBack Cap (80-160pf) styroflex/630V

Styroflex Capacitor Available Here :http://dl.dropbox.com/u/43869772/U67/Picture%20Tron/orderformDU67.xls
 

Microphone Body and accessories Available Here :http://www.groupdiy.com/index.php?topic=50015.0

Bellow Basic Setup for Different Version , different folks different strokes  8)

I have been working on validating the last details regarding mouting the AMI boards and last fine tuning regarding the Clearance of the track pad in respect to th railing and position,  fit in the mic boady and hole tolerance ,  I am pleased to annonce that all my concerns on this have been validated ,

here some
AMI  or External Board Mounting Hints and clearance railing test,  :)

and Yes this is My favourite Celebration beers the Boddingtons  ;D








































The D-U67 Build

All Of it, 100% original Circuit , No Exception  :) Include Calibration Check Port & Internal LC shift Switch ;)





External Transformer Such As Tabfunkenwork AMI T67 PCB shown in Photo Build ,  Ioaudio BV 12 on the left,

PSU thanks To  DanDeurloo
Dan's Case Available here : http://www.collectivecases.com/
or Here: http://www.groupdiy.com/index.php?topic=41963.0









The Build of the HZ floating Bridge uses all the existing resistor and capacitor leads  ;)

























































































































































The D-U67 and the D-M269 Share the same  pattern switch , low cut switch, and pad switch wiring. the only difference is for Pattern Swich Pin 1 For A complete switch connection tutorial see here in build Part 2 : http://www.groupdiy.com/index.php?topic=51350.0 






AMI T67 Example.






























Re: D-U67 Tube Microphone Build Thread.
« Reply #1 on: October 01, 2012, 08:24:48 AM »
First post! And perhaps the most useless...   :)

http://www.crameda.com/pdf_files/eng/multiswitch/MS-L-E-060915.pdf

If one was willing to go the extra mile and mount these to Chungers u67 will it work electricaly with the circuit? Not sure what current and voltage flows through the pattern switch. It's possible to get custom markings on the thumb wheel so if well mounted they would look pretty nice. Or? I might be in over my head here.. =)


/
Emil

HellfireStudios

Re: D-U67 Tube Microphone Build Thread.
« Reply #2 on: October 01, 2012, 09:24:28 AM »
First post! And perhaps the most useless...   :)

http://www.crameda.com/pdf_files/eng/multiswitch/MS-L-E-060915.pdf

If one was willing to go the extra mile and mount these to Chungers u67 will it work electricaly with the circuit? Not sure what current and voltage flows through the pattern switch. It's possible to get custom markings on the thumb wheel so if well mounted they would look pretty nice. Or? I might be in over my head here.. =)


/
Emil

That switch seems very complicated. The switch you would need requires that at least one position is "off." A simple SPDT on-off-on switch would be easier to implement, but I believe Chunger's U-67 body already has the right switches. I hope that helps.

-James-
"Tommorrow is just yesterday in reverse. Just like friends are enemies in reverse." -Gary Busey

Re: D-U67 Tube Microphone Build Thread.
« Reply #3 on: October 01, 2012, 09:44:51 AM »
Of course it's complicated! Even fitting it/them to body is probably close to impossible due to the size of them. Would look cool though, and closer to original Neumann design.

Re: D-U67 Tube Microphone Build Thread.
« Reply #4 on: October 01, 2012, 09:55:08 AM »
Of course it's complicated! Even fitting it/them to body is probably close to impossible due to the size of them. Would look cool though, and closer to original Neumann design.

you would be able to Set "5"-"6" for cardiod mode tough.  ;D ;)
Best
Dany,

JessJackson

Re: D-U67 Tube Microphone Build Thread.
« Reply #5 on: October 03, 2012, 06:38:14 AM »
Had the body powder coated almond.

Interested in the above switches or other cosmetic improvements

Need a new grill built the same contour lines as mic body / original 67. Back side of grill to be black wire (like elam). Probably going to go for open weave one layer c12 type. Anyone here messed with different mesh sizes and types on 67/87 types? Even contemplating buying head assembly from sennheiser.

Polish grill holder to chrome.

Need to source touchel connector.

Probably wont stick those flags on there... was just messing around with a pin.


Dylan W

Re: D-U67 Tube Microphone Build Thread.
« Reply #6 on: October 03, 2012, 04:35:22 PM »
Had the body powder coated almond.

Interested in the above switches or other cosmetic improvements

Need a new grill built the same contour lines as mic body / original 67. Back side of grill to be black wire (like elam). Probably going to go for open weave one layer c12 type. Anyone here messed with different mesh sizes and types on 67/87 types? Even contemplating buying head assembly from sennheiser.

Polish grill holder to chrome.

Need to source touchel connector.

Probably wont stick those flags on there... was just messing around with a pin.

Jess,

That looks great. I'm planning on getting a powder coating gun to do mine.

Haven't ordered my body yet, think a Binder 7 pin connector will fit?
« Last Edit: October 03, 2012, 06:36:43 PM by Dylan W »

Volume11

Re: D-U67 Tube Microphone Build Thread.
« Reply #7 on: October 03, 2012, 06:17:47 PM »
Hey guys, I just bought some gac7 cable from redco, and a have a couple questions before I start assembling it. Is there a specific color to pin number orientation? I noticed that the blue wire is a thicker gauge. I am also unsure as to what I should do with the shield. I'm having trouble loading some of the build docs on my ipad  >:(

By the way, that powder coated body looks excellent, I might have to do something similar

dmp

Re: D-U67 Tube Microphone Build Thread.
« Reply #8 on: October 03, 2012, 06:27:31 PM »
There should be two thicker wires for the heater
Two thin wires in a twisted pair for the audio
The mogami tube mic cable datasheet is good to look at to get an idea what to use for what

Re: D-U67 Tube Microphone Build Thread.
« Reply #9 on: October 03, 2012, 06:29:02 PM »
Hey guys, I just bought some gac7 cable from redco, and a have a couple questions before I start assembling it. Is there a specific color to pin number orientation? I noticed that the blue wire is a thicker gauge. I am also unsure as to what I should do with the shield. I'm having trouble loading some of the build docs on my ipad  >:(

By the way, that powder coated body looks excellent, I might have to do something similar

Hope this helps , Red and Blue Wire are bigger because more current goes trough them so less voltag drop long run ,

in my example the Red is filament and Blue the ground ,

Shield question =
Basically your cable is not using the black wire incsde it uses the shield instead  Just Leave out the black wire inside the cable , and both will connect in position # 3 at both ends,
Note: there is a SHLF jumper on the PSU pcb this is the Starground point of the Shield
So if you cont connect it to the microphone position #3 make sure you have this jumper installed refer to the PsU schematic for details,
Hope that  Helps,

PS: i did not know IStuff could actually have an error  ;D
Dany,


Volume11

Re: D-U67 Tube Microphone Build Thread.
« Reply #10 on: October 03, 2012, 06:35:20 PM »
Thanks Dany, that's everything I needed to know and more. Thanks for the explanation. I get an error when I try to load the build docs. The safety one loads fine every time.

Re: D-U67 Tube Microphone Build Thread.
« Reply #11 on: October 03, 2012, 06:46:25 PM »
Thanks Dany, that's everything I needed to know and more. Thanks for the explanation. I get an error when I try to load the build docs. The safety one loads fine every time.

You are very Correct to Remind Everyone that this project uses 200VDC, wich is Lethal SO... safety is everything before everything. please Read the Safety Manual.

Dan,


mrcase

Re: D-U67 Tube Microphone Build Thread.
« Reply #12 on: October 04, 2012, 06:03:27 AM »
Hey All!

As already asked in the whitemarket thread, I was wondering which (brand) tubes everyone is using?
Is it really worth to invest in an Telefunken EF806s? see
http://www.gearslutz.com/board/high-end/130060-u67-tube.html

thanks

Sredna

Re: D-U67 Tube Microphone Build Thread.
« Reply #13 on: October 04, 2012, 06:35:14 AM »
Depends on your budget, you have to buy several to test for noise and microphony.

Hmm... in which direction do the electrons actually go?

kpearsall

Re: D-U67 Tube Microphone Build Thread.
« Reply #14 on: October 04, 2012, 06:40:00 AM »
www.tubedepot.com you can ask them to select for low noise + microphonics from there. Always great quality from that store.

That's the route I'll be going for my tubes. Going to try the EF86 and EF806. And whatever else I can dig up out of my collection. I don't have any pairs at the moment though, and i'm building two, so I'll have to buy a set somewhere. Beezneez capsule and IOAudio transformer are priority right now though.

Sredna

Re: D-U67 Tube Microphone Build Thread.
« Reply #15 on: October 04, 2012, 07:44:59 AM »
Keep in mind that in a microphone circuit the tube is working outside is normal parameters,
most selection/matching is done for "normal" applications (ie preamp stages).

The "selected" tube may or may not work well in your microphone.

Finding a seller who is willing to take back/replace a noisy tube may be practical....
Hmm... in which direction do the electrons actually go?

kpearsall

Re: D-U67 Tube Microphone Build Thread.
« Reply #16 on: October 04, 2012, 07:21:26 PM »
All good points Sredna. Yea, I wouldn't just "trust" anything. I'm gathering as many tubes, bought and borrowed, as I can to do a listening test with a friend who has two 67's. I'm going to try out the selected ones from that link so I know if it's going to be sufficient or not for future tube mic builds. :)


Re: D-U67 Tube Microphone Build Thread.
« Reply #17 on: October 04, 2012, 07:25:47 PM »
All good points Sredna. Yea, I wouldn't just "trust" anything. I'm gathering as many tubes, bought and borrowed, as I can to do a listening test with a friend who has two 67's. I'm going to try out the selected ones from that link so I know if it's going to be sufficient or not for future tube mic builds. :)

+1 for the experiment.  ;)

Volume11

Re: D-U67 Tube Microphone Build Thread.
« Reply #18 on: October 05, 2012, 05:01:10 PM »
Hey guys, a couple more newbie questions for you.
First, I am a little confused as to where I should hook up the primaries on the 20v transformer. Do they both go to the switch, or one to the switch and the other to neutral, neither of those?

Also, I have holes on the front and back of my psu case, so I was thinking of just putting in two LEDs. Where's a good place to draw power for them from?


ktfstudio

Re: D-U67 Tube Microphone Build Thread.
« Reply #19 on: October 05, 2012, 05:08:29 PM »
Curious about your  "EXCEPTION 1" pic. What am I missing?                                                           


 

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