Neumann U47FET Clone: D-U47 FET Microphone Project PCB Build thread

[Winetree]

MicDaddy, What capsule are you using?

 

[MicDaddy]

MicDaddy, What capsule are you using?

ChuckD's M7.  Sits a little high in the headbasket and sounds wonderful. 

I populated the trimmer and tweaked by ear some with no discernible change in audio.

 

[poctop]

MicDaddy, What capsule are you using?

ChuckD's M7.  Sits a little high in the headbasket and sounds wonderful. 

I populated the trimmer and tweaked by ear some with no discernible change in audio.

thanks Micdaddy,  your are correct to say that it sits a tad high, in my 49b that i just put the M7 in i had to remove the top screw because it go it contact with my backplate on the headbasket and my pattern did not work,    took a good 5 minutes until i figured out 
thanks For your post ,

Best,
Dan,

 

[poctop]

I populated the trimmer and tweaked by ear some with no discernible change in audio.

the trimmer on this build will not affect the sound but more a tad in the VDS of the FET,  just a tad, and since it is self bias type circuit it should not affect the sound at all,

the trimmer can be easily omitted as per the 1 page procedure with no adverse affect on the sound at all,

best,
DAn,

 

[MicDaddy]

The GT-2B blasted down.  The front grille mesh didn't care for such abuse and did start to curl in around the outer edges as it isn't adhered entirely around the lip, only spot welded with solder.

 

[MicDaddy]

Powder painted matte black. 

A warning regarding these head-baskets.  They are literally held together entirely with solder. 

During the outgassing process, I discovered the hanger naked and the head-basket in pieces at the bottom of the oven.  I had to do a lot of desoldering and reconstruct the thing with a loctite.

 

[HellfireStudios]

The capsule seems to be a bit high. The headbasket ring might interfere with proper pickup.

-James-

 

[kante1603]

The capsule seems to be a bit high. The headbasket ring might interfere with proper pickup.

-James-

Hi James,

in the original build the capsule does sit very high in the basket,about one third behind the upper ring.Look here (scroll down a bit,you'll see what I mean):

http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Neumann-Mikro/U47/U47.htm

As long as it doesn't touch the top mesh I'd say it's o.k..

Cheers,

Udo.

Congrats MicDaddy btw.!

 

[poctop]

For those that will be building the mic project that needs the 0.01uf  capacitor in the package 5*11mm  i have been able to change mouser minds to offer a 10% variation at a minimum qty of 1  ,

here is a link for it ,
http://ca.mouser.com/ProductDetail/Vishay-Roederstein/MKT1813310405/?qs=N5kmjX/bzE4Fjs7uA0EePA==

i aslo went over my BOM and added in the customer part number cell some nice subsitution for the parts that went back order , should be all good now ,

Best,
Dan,

 

[tskguy]

Hey all,

I wanted post some pictures of my newest microphone!! Thanks to my good friend Wave (he built it!) I also have a bit of news regarding a capsule as well... Its a new capsule I am selling that works in any of the mic's that use a 47 or m7 style capsule.
I had a RK7 capsules laying around so I thought I would  do a comparison, the first clip is the 47fet with a RK7
Second clip is my H20 capsule. Its a bit of a 47,67, hybrid. I personally think its sound great. No pop screen and I am about 3-4 inches away. Let me know!
Another cool thing is a new TX available from Cinemag. http://cinemag.biz/mic_output/PDF/CM-13101.pdf
Its sounds fantastic and is true to the original TX Dany was directly involved with its creation.
Clip 1 RK7
https://dl.dropboxusercontent.com/u/55530129/47fetRK7capsule.wav
Clip 2 H20
https://dl.dropboxusercontent.com/u/55530129/47fetTSKcapsule.wav






Eric

 

[KasperNyhus]

Hi guys
I have a problem with my u47fet build. Unfortunately it sounds very thin.
I read that someone earlier had a similar problem due to the trafo touching the house, but I have checked and double checked for that.
I made the following sweep and it clearly shows the problem

https://dl.dropboxusercontent.com/u/14107936/u47fet%20sweep.MOV

Does anyone of you know what might cause all this trouble?

/Kasper

 

[tskguy]

Did you check all of the voltages?? Do you have the roll off inadvertently switched on?

 

[tskguy]

Hey guys,

Her is a little guitar track I just did, please forgive the crappy playing I am drummer!!!
https://dl.dropboxusercontent.com/u/55530129/47fet%20Guitar.wav

I think it sounds pretty darn nice, Its was recorded through my ssl9k in to my ssl converters at 44.1 no eq or anything else.
Man I dig this mic!! Thanks to Dany again for a great project, it sounds really great in my opinion. I cant wait to hear it on some other sources.

Eric

 

[3nity]

Do you guys know how to install à Chuck M7 in the fet47?

 

[MicDaddy]

Do you guys know how to install à Chuck M7 in the fet47?

I marked and punched the very center of the circular metal disc -which holds the stock capsule- then drilled using a bit to accommodate the m7 mount screw.

 

[tskguy]

Tuff crowd  :-\

 

[HellfireStudios]

Hey guys,

Her is a little guitar track I just did, please forgive the crappy playing I am drummer!!!
https://dl.dropboxusercontent.com/u/55530129/47fet%20Guitar.wav

I think it sounds pretty darn nice, Its was recorded through my ssl9k in to my ssl converters at 44.1 no eq or anything else.
Man I dig this mic!! Thanks to Dany again for a great project, it sounds really great in my opinion. I cant wait to hear it on some other sources.

Eric

I really like the clarity. A little too much pick noise for my tastes, but it's not the mic. It's just placement to my ears.

-James-

 

[3nity]

What about the hookup?
Does the red cable means front capsule?? What should i do with the rear wire then?

 

[tskguy]

The 47fet is Cardioid only so you only need to make the front capsule and backplate connection. Sadly the back side isnt used in the 47fet.

Eric

 

[poctop]

The 47fet is Cardioid only so you only need to make the front capsule and backplate connection. Sadly the back side isnt used in the 47fet.

Eric

Correction supercardiod only