Neumann U67 Clone : D-U67 Tube Microphone Build Thread.

[imo]

Kevin,
you need a load for the voltage to come down to what it should be. That all sounds right, though i think my B+ was a bit higher

 

[imo]

wanted to say that the Telefunken finally quieted down after a number of days. this makes me happy! I am still on the lookout for some other EF86's.
Man, those NOS high end Tele tubes are BIG bucks(hilunum)

 

[DUDE GUY]

Thanks imo, that makes perfect sense. Still have to buy my bv.12, hence why no load.

 

[DUDE GUY]

Hello, here are some pictures of my PSU for reference. I used the Hammond enclosure included in the BOM, so the real estate was limited, however the overall size of the enclosure is quite nice. The L bracket technique was very useful, thanks to the terrebonne pics in the build folder. I used a terminal strip for the power connections, which made things a bit cleaner. The PSU seems to be working fine, although I don't have a complete mic with which to test. Yes, I put knobs on the trim pots ha. I felt sorry for them, all exposed. Anyway, I welcome any criticisms of my build and techniques, as I'm always looking to learn. Thanks.

-Kevin

 

[DUDE GUY]

Side view

 

[DUDE GUY]

Transformer input, IEC and switch

 

[DUDE GUY]

Transformer output to pcb connections

 

[DUDE GUY]

Terminal strip, velcro'd to transformer

 

[DUDE GUY]

RTRIM PLATE

 

[DUDE GUY]

RTRIM H-

 

[DUDE GUY]

Life

 

[DUDE GUY]

Also, I'm still a bit unclear as to the mic cable connections. On the male end of the mic cable, I have the shield connected to pin 3, but what about the female side? Should it also connect to pin 3? In this case, it wouldn't be connected to anything since I don't have pin 3 connected in the mic. Is this right?

Or should I connect the shield on the female side of the mic cable to pin 3 and on the 7-pin XLR insert, solder a jumper from pin 3 to the ground pin, so it connects to the mic body?

Thanks,

-Kevin

 

[dgoszillai]

Dude guy thx for these pictures ! will be big help.

 

[dmp]

Your build is looking really nice dudeguy.

For the ground layout I followed poctops instructions, and once I got it right the mic was silent.

Cable has the shield connect to pin 3 on both sides:
3 - shield - 3
mic:
pin 3 connects to board

 

[DUDE GUY]

Dgoszillai, I'm glad to help. Best of luck on your build.

Dmp, thanks for the kind words and, once again, thanks for clarifying.

I'll post some more pics of my actual mic for reference. Chunger's donor bodies are great, btw.

-Kevin

 

[Winetree]

Just finished.
All I need to do is find some tubes.

 

[DUDE GUY]

Looks great, winetree! I wish I had two of them! Get some tuuuubes!

-Kevin

 

[DUDE GUY]

Mic cable - showing the braided shield connected to pin 3 on both ends. The black lead was clipped and white heat shrink added just to be clean/safe. This goes along with Dan's GAC-7 cable diagram in the build folder. Hope this helps.

-Kevin

 

[Winetree]

Thinking of pushing the button on one $165.00 NOS Telefunken EF 806s tube.
And I need two. I've used the best of everything so far. Do I skimp on the tube?
Any other suggestions?

 

[wave]

Thinking of pushing the button on one $165.00 NOS Telefunken EF 806s tube.
And I need two. I've used the best of everything so far. Do I skimp on the tube?
Any other suggestions?

IMO if you've gone high end with everything else, you might as well go high end with the tube! What kind of capsule are you using?

Dave