GroupDIY

Project Specific Discussions => Microphones => Topic started by: poctop on July 31, 2014, 12:49:06 PM

Title: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on July 31, 2014, 12:49:06 PM
Hi GroupdiY,

Lately i was working with Oliver with his consent To make a little PCB kit to Build his version of the U47 with EF800 tube.
As you may already know Oliver passed away but I decided to go ahead and finish it in his memory.
This mic once finished will be called the OA tribute U47.

here some partial insight on the construction , the mic will be using Oliver Clasic BV08 series Transformer and Ef800 tube that he personnaly sent to me , I am honnored, I could never thank Oliver enough.
 

PSU

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0708b.jpeg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199431a.jpg)

PCBS
(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a070c5.jpg)

Mic
(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a070dc.jpg)

To be continued.............
Best,
Dan,

Hi All, Just finished Final Testing this microphone,  Everything Works as expected and I am incredibly happy with the sounds of this microphone  :) :) :) :) ,  Many thanks To Oliver for this Awesome Creation.
and one of the most impressive thing not to say the least  this microphone is Incredibly QUIET with this Ef800 Telefunken tube in it ,
This kit will b able to Drive Ef800 , eF802 and Ef80 Telefunken tubes  ;)
Absolutely Love it.

I am opening the Kit to the DIY community as we speak,  there is some minor Adjustemet I had to do with the PSU resistance Value
there is notes on the Shared mouser BOM about Those changes.



PSU PCB SilK Errata


Needs to be

H+
R2 = 6.8ohm 3W
R6  = 4.7 ohm 3W
R11 = 4.7 ohm 3W


B+
R1 = 20K 2W
R3  = 20K 2W
R8 = 25K pot.


This Project need to be adjusted to B+ 105V and H+ to 5.05V as Per Oliver Schematic
Make sure you Follow the component number on the schematic that is posted here , they are not the same as Oliver schematic

The BOM do not contains the Reed Switch but are available at those location ,

the PCB is designed to support these 2 Reed Relay 24V and 48V, Only one resistor is specifically used on the psu for 24V or 48V relay. Notes are in the BOM as well,  Rcoil Relay on the Psu denotes the resistance for either 24V operation or 48V operation.

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a070e8.jpg)


48V Shielded Reed Relay Available in the Order Page within the D-47 or D-EF47 order Selection box
http://www.vintagemicrophonepcbkit.com/orders.html

Link to alternative 24V Relay
http://www.digikey.ca/product-search/en?vendor=0keywords=7101-24-1010 Relay Coto PN 7101-24-1010


Here is the tubes datasheet for this project,

https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a070fa.pdf
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0710a.pdf
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0711b.pdf


The Silk Screen will be corrected on the next Batch if Any,

The PCB was specifically design to have package for AMI BV08 Classic Series and AMI T47 Transformer ,
Other transformer can be fitted as well.  Here is the 2 Mounting Strategies that will permit the Use of about any transformer.
 
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0712b.zip


 could not be happier with this Toy,
Thanks Oliver.

Hope you will enjoy,
Best,
Dan,

Schemo Mic
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0713c.pdf


Schemo PSU

https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0714e.pdf

BOM Psu
https://ca.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=acb9dba578

BOM Mic

https://ca.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=f104b8493a

D-EF47 Schematic Thanks toTrans4Funk1
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0715f.pdf



This is Hoe it happened, :)
Best,
DAn,

Pictorial. :)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07171.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07183.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07195.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a071a7.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a071b9.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a071cb.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a071dc.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a071ef.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07203.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07215.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07223.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07235.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07247.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0725a.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0726d.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0727f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a072ab.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a072bf.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a072d2.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a072e0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a072f2.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07304.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07317.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07329.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07337.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07349.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0735a.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0736e.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07380.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0738f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0739d.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a073b0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a073c2.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a073d4.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a073e6.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a073f8.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0740c.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07419.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0742c.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0743e.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07450.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0745f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07471.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07484.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a074af.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a074c3.jpg)


Shown is the D47 dual tube  but the principle and connection are the same just forget about the other tube
(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a074d5.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a074e6.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a074f7.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07508.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199431a.jpg)

Best,
DAn,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on July 31, 2014, 12:50:54 PM
Reserved.....
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on July 31, 2014, 12:51:09 PM
Reserved........
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: kidvybes on August 01, 2014, 12:09:05 AM
...Good Luck with this Dany!...I know Oliver was a strong believer in implementing the Tele EF800 in a 47-style circuit...I'm looking forward to see this build proceed...I'm confident Oliver would have been pleased...

 ;)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 01, 2014, 01:30:16 PM
Hi all,

I have been in trusted with also building this tribute mic, never had the pleasure of meeting or talking to Oliver but as a pupil of music and electronics, i think it's safe to say his influence is felt everywhere.
I am very honoured to have Dany trust me with this and as my mentor I can't thank Dany enough.

Some pictures of the start of my build.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 01, 2014, 01:31:53 PM
I've done my psu in a 50 cal ammunition box, mine is not exactly to the BOM but spec wise it all falls in once calibrated I hope!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 01, 2014, 01:32:40 PM
Back view
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 01, 2014, 01:33:14 PM
The inerts! Plenty of room to have enough to power 2 mics in here!!

Just waiting for a 2 x 115v to 230v transformer to turn up then I can test.

I will be making my own body for this build in true DIY style.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 02, 2014, 07:41:08 AM
Hi,

Today is a marking and prepping day! Nickel plating and shiny will come later.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: maq3396 on August 02, 2014, 10:56:11 AM
I am sure that Oliver would feel honored by your efforts.
Thank you for carrying on this work.
Do you plan to make this microphone a single production for Oliver or perhaps release it to the community?

Thanks
Mac
 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 02, 2014, 11:39:22 AM
I am sure that Oliver would feel honored by your efforts.
Thank you for carrying on this work.
Do you plan to make this microphone a single production for Oliver or perhaps release it to the community?

Thanks
Mac

Thanks Mac, Yes I will pass it on once it pass all the testing.
Best,
Dan,
 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 04, 2014, 05:53:40 AM
Hi,

Here a pic of the body, fair bit more tweaking too go.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 04, 2014, 10:03:27 AM
Few more tweaks later.

Regards
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Patrick from Davis on August 04, 2014, 02:14:55 PM
It would be cool to get OA badges made up for these.   Regardless of the body style, it would be a way to give a nod to the man.
Patrick

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bernbrue on August 04, 2014, 02:23:45 PM
Thanks Mac, Yes I will pass it on once it pass all the testing.
Best,
Dan,

Very interested in pcbs for Olivers version of the U47. Thanks for doing this, Dan!
Bernd
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: 0dbfs on August 04, 2014, 02:24:05 PM
This is awesome! What is the bottom bell part?

Thx,
jonathan
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 04, 2014, 03:25:14 PM
Few more tweaks later.

Regards

Hey Spence , The Logo is incredible , you nailed it awesomely, this is so cool.
how awesome would it be if we could have a supply chain of those alctron U47 style body I really like them and obviously a perfect fit for this project.
I am really curious what a feeler thread on this would reveal.
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 04, 2014, 03:47:45 PM
Hi Dany,

glad you liked my idea, not quite finished yet but getting there.
Sound good what your suggesting.
Im on skype now if you ring me.

regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 04, 2014, 03:50:13 PM
hi 0dbfs,

the bottom cap/bell is something i had machined out of aluminium.

regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 13, 2014, 07:19:53 PM
Some more pictures
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 13, 2014, 07:21:43 PM
Inside
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 13, 2014, 07:22:20 PM
Inside 2
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 22, 2014, 03:39:25 PM
Almost there,

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199433d.jpg)

Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 22, 2014, 04:18:05 PM
Pictorial. :)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0758b.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0759e.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a075b0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a075c2.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a075d4.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a075e6.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a075f8.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0760a.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0761c.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0762e.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07640.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07652.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07664.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07676.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a076a1.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a076b3.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a076c5.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a076d7.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a076e9.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a076fb.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0770f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07721.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07733.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07744.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07756.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07768.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0777a.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0778c.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0779f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a077b0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a077c2.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a077d0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a077de.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a077f0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a077fe.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0780f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0781f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07831.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0783f.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0784c.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07860.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07873.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0789e.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a078b0.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a078c2.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a078d6.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a078e8.jpg)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199434c.jpg)



Best,
DAn,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 23, 2014, 02:12:42 PM
Hi All, Just finished Final Testing this microphone,  Everything Works as expected and I am incredibly happy with the sounds of this microphone  :) :) :) :) ,  Many thanks To Oliver for this Awesome Creation.
and one of the most impressive thing not to say the least  this microphone is Incredibly QUIET with this Ef800 Telefunken tube in it ,
This kit will b able to Drive Ef800 , eF802 and Ef80 Telefunken tubes  ;)
Absolutely Love it.

I am opening the Kit to the DIY community as we speak,  there is some minor Adjustemet I had to do with the PSU resistance Value
there is notes on the Shared mouser BOM about Those changes.


B+
R2 = 6.8ohm 3W
R6  = 4.7 ohm 3W
R11 = 4.7 ohm 3W


H+
R1 = 20K 2W
R3  = 20K 2W
R8 = 25K pot.


The BOM do not contains the Reed Switch but are available at those location ,

the PCB is designed to support these 2 Reed Relay 24V and 48V, Only one resistor is specifically used on the psu for 24V or 48V relay. Notes are in the BOM as well,  Rcoil Relay on the Psu denotes the resistance for either 24V operation or 48V operation.


RS Stock No. 291-9631 Brand RS Mfr. Part No. B48-1A72-BV631 RoHS Status Compliant Catalogue page 1186 Customer reviews (0) Add a review

http://uk.rs-online.com/web/p/reed-relays/2919631/

http://www.digikey.ca/product-search/en?vendor=0keywords=7101-24-1010 Relay Coto PN 7101-24-1010


The Silk Screen will be corrected on the next Batch if Any,

The PCB was specifically design to have package for AMI BV08 Classic Series and AMI T47 Transformer ,
Other transformer can be fitted as well.  Here is the 2 Mounting Strategies that will permit the Use of about any transformer.
 
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199435c.zip

 could not be happier with this Toy,
Thanks Oliver.

Hope you will enjoy,
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bernbrue on August 23, 2014, 02:47:03 PM
Just ordered 2 kits. Thanks a lot, Dan!
Bernd
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 23, 2014, 03:09:44 PM
Just ordered 2 kits. Thanks a lot, Dan!
Bernd

Thanks Bernd,
Enjoy, 8) 
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: kidvybes on August 23, 2014, 03:46:34 PM
...would I be correct in assuming this mic will work with a standard PSU design like the Zayance?...
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 23, 2014, 03:56:41 PM
...would I be correct in assuming this mic will work with a standard PSU design like the Zayance?...

it is not the U47 single supply Line Style like the one from Zayance ,

B+ has its Own , and H+ as its own ,

Fully Passive Split Choke Design, dual supply,

it is actually a Passive2469 PSU with special Feature for this Mic,

Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tommypiper on August 23, 2014, 06:22:14 PM
Dany, great project.  But for this project, what about availability of the BV08 transformers? Now that Oliver is passed away and his partners are trying to catch up?  The future may be a bit uncertain about the transformers... ???

Also, on the AMI site it mentions the BV8R as the one to use for the EF800 tube, but your pictures are showing the BV08.  Can we use either transformer?

Are they available anywhere right now? 

I don't want to use the high nickel Cinemag, but if there are other alternatives let me know, thanks.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 23, 2014, 06:41:51 PM
Dany, great project.  But for this project, what about availability of the BV08 transformers? Now that Oliver is passed away and his partners are trying to catch up?  The future may be a bit uncertain about the transformers... ???

Also, on the AMI site it mentions the BV8R as the one to use for the EF800 tube, but your pictures are showing the BV08.  Can we use either transformer?

Are they available anywhere right now? 

I don't want to use the high nickel Cinemag, but if there are other alternatives let me know, thanks.


Also, on the AMI site it mentions the BV8R as the one to use for the EF800 tube, but your pictures are showing the BV08.  Can we use either transformer?

the Bv08 classic series did not exist when this was done, as far as the future of AMI I am trying to help them as much as possible, there is no better way of helping them endorsing their transformer  ;) because they really sound great.

if you wish , you can use any transformer you would like bv8 Style ratio , Other transformer will be able to be mounted with the pcb backwards mounting style. incredible what a Tie-Wrap Can do when properly fixed 8)

Best,
dAn ,






Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 24, 2014, 09:49:05 AM
Here is the tubes datasheet for this project,

https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a07d5b.pdf
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0710a.pdf
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199437f.pdf


 :)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 25, 2014, 09:05:24 PM
Added Mic Schemo with reference voltage  :)
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Melodeath00 on August 26, 2014, 01:23:43 PM
I see you're underheating the tube at 5.2V. Was this Oliver's suggestion?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 26, 2014, 01:25:08 PM
I see you're underheating the tube at 5.2V. Was this Oliver's suggestion?

Absolutely,
Best,
DAn,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Melodeath00 on August 26, 2014, 01:27:21 PM
Interesting! I have his PSU and by default mine wound up underheating at 5.67V. I'm still not sure if the PSU has a built in trim pot - I am a bit of a newb still haha. If it didn't I was planning to make a modification that would allow me to adjust it, but again, I don't know specifically how I would do that.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 26, 2014, 01:31:21 PM
Interesting! I have his PSU and by default mine wound up underheating at 5.67V. I'm still not sure if the PSU has a built in trim pot - I am a bit of a newb still haha. If it didn't I was planning to make a modification that would allow me to adjust it, but again, I don't know specifically how I would do that.

there is a trimpot on oliver PSU IIrC,
Best,
DAn,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Melodeath00 on August 26, 2014, 04:36:27 PM
Thanks, Dan. By the way, do you know what the difference is between the BV8R and the Classic Series BV08? Is it just the appearance?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 26, 2014, 06:36:20 PM
Hi all,

Got my D-EF47 going finally!! Sounds amazing, gotta thank dany for putting up with my endless stupid questions and general dumbness!!!!
A while ago I have made 4 of my own U47 based on the Oliver schematics and this one sounds so much better.

Much more gain and precision in the sound.

This is the best sounding U47 circuit I've heard.

Just need to finish the nickel plating and I will post up some finished pictures.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Pip on August 30, 2014, 03:20:32 PM
Hi all,

Got my D-EF47 going finally!! Sounds amazing, gotta thank dany for putting up with my endless stupid questions and general dumbness!!!!
A while ago I have made 4 of my own U47 based on the Oliver schematics and this one sounds so much better.

Much more gain and precision in the sound.

This is the best sounding U47 circuit I've heard.

Just need to finish the nickel plating and I will post up some finished pictures.

Regards

Spence.


Can you give some sound files as a shoot out? How many others "have you heard" and short of whos they were what are the differences? Rather pregnant statement is all. :)

Good luck with the plating.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Patrick from Davis on September 19, 2014, 02:30:49 PM
Looking at the AMI site, there seems to be four transformers that fit the project: BV8N, BV8R, T8, T47.   Certainly there is a price difference, but can anyone shed some light on how these will effect the overall sound?  While I am always looking out to save some money, I would rather do things once and do them right the first time.
Patrick

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Melodeath00 on September 19, 2014, 09:13:05 PM
Hi all,

Got my D-EF47 going finally!! Sounds amazing, gotta thank dany for putting up with my endless stupid questions and general dumbness!!!!
A while ago I have made 4 of my own U47 based on the Oliver schematics and this one sounds so much better.

Much more gain and precision in the sound.

This is the best sounding U47 circuit I've heard.

Just need to finish the nickel plating and I will post up some finished pictures.

Regards

Spence.

How does this one differ from other Oliver designs you've done?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on September 21, 2014, 04:27:25 AM
HI,

this design is slightly different as it uses a different relay which has a diode, some of the resistors i've used in my other ones are slightly different, i like the colour of my other ones but these ones just sound much cleaner and smoother.
Also i made my own pcbs and my pcbs are no way as good as danys, no comparison.
buys some and starting building, you wont regret it dude.

regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: esefkhe on October 03, 2014, 03:13:39 PM
I have been reading the ENTIRE INTERNET looking for a place to purchase a blank body in a long u47 format like everyone has.

I can find this for 47Fet style http://store.studio939.com/product/gt-2b-microphone-body 100$usd for body basket box shock everything "metal/mechanical"

Ami offers a complete solution for around 400, as do a few other manufacturers... But is the tube47 body 4x higher in demand relative to supply as opposed to the 47fet body?

Am I missing something? For some machined metal, 400 seems ridiculous. 80 for the metal, shock mount, and 20 for the case? That's more like it.

PLEASE point me in the direction of a body kit that would fit this board (I actually found the board - and while searching for a body, found this build thread)

Ps very nice work! I can't wait to get started! Also - if any of you guys have machine shop friends or a couple extra tube u47 long complete bodies lying around I'm willing to buy privately.

Looking for a single complete mechanical solution for the u47 body without pcb/elec

Thanks so much!!!
J
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: kidvybes on October 03, 2014, 05:37:01 PM
...as of this time, it appears there are no immediate sources for a complete long-body U47 body/headbasket setup for less than the cost of the AMI option, with Equinox no longer offering them...the difficulty comes in manufacturing a proper historically accurate headbasket...but, there are options being explored by members of this forum...keep watching these threads for updates...
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: esefkhe on October 03, 2014, 05:54:15 PM
...as of this time, it appears there are no immediate sources for a complete long-body U47 body/headbasket setup for less than the cost of the AMI option, with Equinox no longer offering them...the difficulty comes in manufacturing a proper historically accurate headbasket...but, there are options being explored by members of this forum...keep watching these threads for updates...

Bollox. Thanks for a definitive answer, yes I'm aware that the basket is the bread n butter - any opinion on who of the current manufacturers has the "best balanced" color/openness head basket design? It would seem like ami is the most popular amongst diy ers though flea offers a body kit as well... Waiting on a price quote from VKing.

Suggestions?

Thank you again!
J
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on October 04, 2014, 03:58:10 PM
Hi guys,

Just to let you know wheels are in motion to produce a accurate  U47 body which will fit all of  dany Bouchards pcbs or your own P2P boards.
It will come in several different lengths and space for switches will be available.
I will post something up in the next few weeks to see what you all think.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: esefkhe on October 05, 2014, 04:31:20 PM
Hi guys,

Just to let you know wheels are in motion to produce a accurate  U47 body which will fit all of  dany Bouchards pcbs or your own P2P boards.
It will come in several different lengths and space for switches will be available.
I will post something up in the next few weeks to see what you all think.

Regards

Spence.

Perfect timing Spence! Please do! I may gladly be your first order :) ill pm you my email address

Regards
J
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on October 05, 2014, 05:18:02 PM
Hi J,

Someone has already pre ordered 20 so you'll have to be second in line I'm afraid!!
Will send you more info as soon as I have it.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: esefkhe on October 06, 2014, 05:20:38 PM
Pm sent.  :)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Melodeath00 on October 28, 2014, 06:20:53 PM
Poctop,

I am confused how the Relay works in this build. Why it is tied to the 5.2V heater if it is a 48V relay?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on October 29, 2014, 08:28:57 AM
Poctop,

I am confused how the Relay works in this build. Why it is tied to the 5.2V heater if it is a 48V relay?

it is not, it is tied to a divider network in the B+ passive section,
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on December 01, 2014, 02:21:52 PM
here is  a very quick speaking test with the one pictured on the thread,

https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199445d.wav

Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: barbaroja on December 01, 2014, 06:12:42 PM
Interesting to see how this sounds vs the ioaudio mk47 and mk-u47 version. Some top designs here.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on December 01, 2014, 06:20:24 PM
Hi guys,

Just got my pair of these EF47 going finally after many issues.
The main issue which I have just sorted out was two dodgy capsules!
Have to say the preliminary results and sounding of these mics is excellent.
Seems to have much lower noise when using EF800 over EF80.
Ives used a 48v relay for one psu and a 5v relay for the other one.
Will post up some sound samples once I've  recorded some.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: micaddict on December 02, 2014, 06:27:00 AM
here is  a very quick speaking test with the one pictured on the thread,

https://dl.dropboxusercontent.com/u/43869772/D-EF47.wav

Best,
Dan,


Sounds very promising.  :)

The Cinemag NiCo is a superb transformer and very hifi.
Oliver's BV8 (used here) seems a little less "perfect" but sexier and as such maybe closer to the vintage sound.
An A/B shootout between those two (preferably with all other components the same) would be great.
Any chance of that?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on February 23, 2015, 11:11:25 AM
For Those who wander how to install the Bv8 classic series ,

here is a tip that will work for you identify wich winding is wich ,
take a DMM and set it to measure resistance ,
find the 2 pair of wire that will give you a resistance reading ,  the lower resistance value will be the output of the transformer
labeled as S+ and S-  (secondary)
the highest resistance value will be  the primary of the transformer , P+ and P-

this is an example for the AMI Site ,
the color are not a 100% match but it will get you started,

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d02819944f7.jpg)

Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dougch on February 23, 2015, 07:58:05 PM
Anyone use the Bv8r? I have been thinking of using it.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on February 24, 2015, 02:14:23 PM
Hi guys.  I'm hoping to get some help.  Does this crude diagram reflect the correct wiring for the 120v section of the D-EF47 PSU?  Also, is the PCB 0V-1 pad grounded to chassis?  And is the ground on the AC Power Entry Module also grounded to the chassis?  Jimi Ray
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on February 28, 2015, 03:19:56 PM
Hi guys.  I'm hoping to get some help.  Does this crude diagram reflect the correct wiring for the 120v section of the D-EF47 PSU?  Also, is the PCB 0V-1 pad grounded to chassis?  And is the ground on the AC Power Entry Module also grounded to the chassis?  Jimi Ray

something like this  ;)



Hi Jimi, first thing is that the secondary of this toroid power supply should be wired in series *(red -Orange tied togheter)  for 230V at psu input , hence the black and yellow will go the the 220V input on the psu,  the primary (blue-Violet) ( grey-Brown) is correct on the primary ,      the picture is nice , it would be nice if you could make the correction and I will post it up front the thread for reference ,   the PCB 0V pad you will use a wire and connect it to the chassis of the psu via a bolt trought the case and from there you will send another wire to the earth pin of the 3 pin power connector .  for the rest of the pictorial everything is correct :) and very nice,
Best,
Dan,
PS: please repost your picture with correction and if you could make it fit in the window of the psu it would be nice ,
or send it to me and I will take care of posting it ,


Best,
Dan,


Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on February 28, 2015, 04:09:33 PM
Thank you Dany.  I was close!  hahaha.  I've updated the drawing to reflect the changes and changed it in my original post #58 to make sure there is no confusion for anyone else.  I don't know how to make it fit in the window though.  Maybe you could take it from there and adjust the size?  Thanks.  Jimi Ray
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: soapfoot on March 01, 2015, 09:06:57 AM
Hi there. Cool project, and thread!

I see you used a 27 ohm resistor in the filament/bias supply instead of the 29 ohm as Oliver spec'd.

Just curious if there is a (good) reason for this, and if I should do this in my own build?

Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on March 01, 2015, 09:54:22 AM
Hi there. Cool project, and thread!

I see you used a 27 ohm resistor in the filament/bias supply instead of the 29 ohm as Oliver spec'd.

Just curious if there is a (good) reason for this, and if I should do this in my own build?

Thanks!

27 Ohm is a much more common value and with the tolerance It will get you there,
but you could use this as well

http://ca.mouser.com/ProductDetail/KOA-Speer/MF1-4DC28R7F/?qs=sGAEpiMZZMu61qfTUdNhG%252biW3YcKDP2vpCiYaw4hNOQ%3d

haven't found much difference between the 2
best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: soapfoot on March 01, 2015, 10:57:40 AM
thank you!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on March 01, 2015, 01:48:27 PM
The illustration attached to post #58 with the power supply interconnections shows the exterior view of the IEC AC input panel mount connector but it shows the wire connections as they would appear from the rear.

It may be obvious to some people when they are wiring it up that they need to translate this by thinking backwards. If someone uses the illustration at face value it may create a circumstance where the the switch position is in "off", or the fuse may seemingly be open, while part of the circuit inside the chassis is still hot.

I just prepared a specific illustration of an IEC AC input connector with an integrated fuse in the hopes that it will helpful to someone.

(http://harmoniccycle.com/hc/images/sound/mic/Panel-Mount-IEC-AC-input-connector.jpg)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 01, 2015, 02:21:05 PM
Thanks trans4funks1.  I've updated the sketch in post #58 to include your input connector drawing.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 01, 2015, 08:12:24 PM
I thought I'd throw some pics of my build so far up here.  AMI BV08 Classic transformer, NOS 1968 Telefunken EF800 tube, body ordered from Mic & Mod, Thiersch STW7 Red (shipped but not received yet).

Update: Theirsch Red is now installed and is a very nice sounding capsule!  I highly recommend Siegfried's work.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 01, 2015, 08:13:21 PM
Inside
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 01, 2015, 08:13:54 PM
Inside / tube side.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 01, 2015, 08:16:32 PM
PSU complete.  Binder type case from Dan at collectivecase.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on March 02, 2015, 07:20:34 PM
PSU so far.  Still waiting for some parts from mouser.  Binder type case from Dan at collectivecase.

i Really like your solder dispensing tool :)  nice work place :)
DAn,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 09, 2015, 10:02:06 PM
Hey Dany.  The Pot to adjust the H+ voltage gets warm to the touch in my PSU.  Is that normal?  I'm able to get 5.05v for H+ and 105v on B+ but I'm a little concerned the adjustment pot gets warm to the touch.  Thanks - Jimi Ray

(BTW - the mic fired up just fine!  Very quiet although I'm hearing some microphonics.  Gonna let the tube burn in and go from there.)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on March 11, 2015, 11:10:17 AM
Hey Dany.  The Pot to adjust the H+ voltage gets warm to the touch in my PSU.  Is that normal?  I'm able to get 5.05v for H+ and 105v on B+ but I'm a little concerned the adjustment pot gets warm to the touch.  Thanks - Jimi Ray

(BTW - the mic fired up just fine!  Very quiet although I'm hearing some microphonics.  Gonna let the tube burn in and go from there.)

Glad you made it  :) , Do not hesitate to put up a nice picture of your build up on this thread if you like, it is always nice to see completed build ,

The Pot from the BOM is spec`d for 5W so it is normal that it will get warm those are made for that purpose , make sure it is firmly attached to a bracket or bolted in the PSU case somewhere so it can dissipate heat optimally.

Thanks for Sharing,
Let us know how you like it ,
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 11, 2015, 07:19:10 PM
Hey Dany.  The Pot to adjust the H+ voltage gets warm to the touch in my PSU.  Is that normal?  I'm able to get 5.05v for H+ and 105v on B+ but I'm a little concerned the adjustment pot gets warm to the touch.  Thanks - Jimi Ray

(BTW - the mic fired up just fine!  Very quiet although I'm hearing some microphonics.  Gonna let the tube burn in and go from there.)

Glad you made it  :) , Do not hesitate to put up a nice picture of your build up on this thread if you like, it is always nice to see completed build ,

The Pot from the BOM is spec`d for 5W so it is normal that it will get warm those are made for that purpose , make sure it is firmly attached to a bracket or bolted in the PSU case somewhere so it can dissipate heat optimally.

Thanks for Sharing,
Let us know how you like it ,
Best,
Dan,

Thanks for the reply Dany.  Glad to know the warm pot is normal.  You'll see it is up high on a bracket in my photo.  Reply #66-69 have pictures of my build.  I'll post some recording samples soon.  Thanks.  Jimi Ray
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on March 21, 2015, 02:17:59 PM
Mic body for this project are now available here


http://store.studio939.com/category/microphones-and-parts

http://groupdiy.com/index.php?topic=50015.880

http://groupdiy.com/index.php?topic=58609.0

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on March 23, 2015, 10:35:17 AM
I thought I'd throw some pics of my build so far up here.  AMI BV08 Classic transformer, NOS 1968 Telefunken EF800 tube, body ordered from Mic & Mod, Thiersch STW7 Red (shipped but not received yet).

As I just posted in the U87 build thread, I want to apologize to the group.  I have only  just discovered the discord over "Mic & Mod" and the designs here on GroupDIY.  I did not know about this when I purchased this U47 mic body from Mic & Mod.  I feel horrible and have ordered 2 of Chunger's MK47 mic bodies to make up for it.  I'm really sorry guys  :-\
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jpsexton on April 12, 2015, 08:16:26 PM
I got my body from Chunger and I'm finishing assembly of my Mic & PS. I have a newbie question though.

What are the 7 pin connections to the Mic PCB and also the 7 pin connections on the PSU?

I've tried to figure it out on the schematic but I don't guess I'm smart enough! :-\

Thanks,

John
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on April 12, 2015, 09:38:51 PM
I got my body from Chunger and I'm finishing assembly of my Mic & PS. I have a newbie question though.

What are the 7 pin connections to the Mic PCB and also the 7 pin connections on the PSU?

I've tried to figure it out on the schematic but I don't guess I'm smart enough! :-\

Thanks,

John

if you made it that far I am sure you are smart enough  ;),
tomorrow morning I will try and prepare a little explanation as I have to go now ,
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on April 13, 2015, 08:45:03 AM
Hope this will help,
Best,
Dan,

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d0281994573.jpg)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jpsexton on April 13, 2015, 10:26:49 PM
Perfect! That's exactly what I needed!

Thank You!

John
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on June 11, 2015, 06:28:58 PM
Hi Dan,
 I've been fascinated with the use of relays for onboard switching. I was studying your schematic and I went ahead and drew a version up that seemed more like a traditional schematic rather than a board layout document.

 I'd be happy to send you a pdf that you can share with everyone, but I'm not sure that the diode near the reed switch is placed correctly and I would appreciate it if someone else can check for errors etc.

 Can you explain where I should put the diode?

 Thank You.

(http://harmoniccycle.com/hc/images/sound/mic/D-EF47/D-EF47-EF800.jpg)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on June 12, 2015, 09:21:55 AM
Hi Dan,
 I've been fascinated with the use of relays for onboard switching. I was studying your schematic and I went ahead and drew a version up that seemed more like a traditional schematic rather than a board layout document.

 I'd be happy to send you a pdf that you can share with everyone, but I'm not sure that the diode near the reed switch is placed correctly and I would appreciate it if someone else can check for errors etc.

 Can you explain where I should put the diode?

 Thank You.

(http://harmoniccycle.com/hc/images/sound/mic/D-EF47/D-EF47-EF800.jpg)

Michael I love your work and schematic, yes I would be pleased to have sent it down to me via my email so I can post it and share it  , at the meantime I will be checking it out , including the diode placement, great work again this is a gift to the community,
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on June 12, 2015, 10:56:50 AM
Hi Dan,
 I'm glad to think that you like the drawing.

 If you can confirm that it is an accurate drawing I will send you a hi res pdf that will print nicely on a 8-1/2x11 sheet of paper.

 Thanks.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: JessJackson on June 12, 2015, 03:25:00 PM
why does pin 5 have separate ground to psu, why not just draw line down onto ground.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on June 12, 2015, 05:03:51 PM
As far as I can tell it's the same reason the 1959 U47 schematic used the pin 3,4, and 6 wire connections for ground. Use as much copper as you can for the lowest resistance to ground. It may also be helpful for isolating any noise if for example the heater has a noisy voltage regulator while the B+ is from a cleaner passive layout. I wish we could ask Oliver. :-(

If you think you are setting up some sort of ground loop with multiple connections to ground you can default to one connection.

The second ground connection was shown in Oliver Archut's alternate tube U47 schematic that can be found at AMI/Tab, but the second connection does not seem to appear in Dan's schematic.

I'm going to edit the schematic after Dan gives me a list of fixes/changes so that it matches his PCB design.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on June 14, 2015, 03:37:43 PM
As far as I can tell it's the same reason the 1959 U47 schematic used the pin 3,4, and 6 wire connections for ground. Use as much copper as you can for the lowest resistance to ground. It may also be helpful for isolating any noise if for example the heater has a noisy voltage regulator while the B+ is from a cleaner passive layout. I wish we could ask Oliver. :-(

If you think you are setting up some sort of ground loop with multiple connections to ground you can default to one connection.

The second ground connection was shown in Oliver Archut's alternate tube U47 schematic that can be found at AMI/Tab, but the second connection does not seem to appear in Dan's schematic.

I'm going to edit the schematic after Dan gives me a list of fixes/changes so that it matches his PCB design.

Thanks Michael , Comments sent via you email ,
and thanks again for doing such a great work on those schemos.  :)
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on June 22, 2015, 07:27:42 AM
If you run the transformer in parallel to halve the voltage going to the B+ filtering you will also halve the voltage going to the heater supply.

You can probably design a filter that gets you the 5.05vDC you want for the heater, but as you suggest, the extra current draw through the transformer might be an issue.

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: duantro on June 25, 2015, 10:44:50 AM
Is there a preferred method of ground/shielding these 7 pin mic cables? I'm getting a slight ground buzz in my Oliver alternate u47 ef14 (cs4) mic with both shields connected at the binder connectors.
Edit: apologies Dany, I thought this was the DIY ami u47 thread.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on June 26, 2015, 10:11:03 AM
If you run the transformer in parallel to halve the voltage going to the B+ filtering you will also halve the voltage going to the heater supply.

I'm not sure i follow? This design uses two separate transformers right? One for the B+ , which can have it's primaries wired in series or in parallel, depending on whether you are in the US or Europe, and then a second separate transformer for the
H+ which again can be wired or switched for 110V or 230 use.
My question was regarding why 220vac was chosen for input to the B+ diode bridge.
220vac rms gives a peak voltage of about 320VDC, so we are having to drop around 215VDC to get to the 105VDC plate voltage, which seems like a lot to me. I was just wondering if other people have built this power supply successfully and achieved the desired plate voltage.
I've just simulated the circuit using Multisim (see attached) and there appears to be about 220VDC after the filtering (if the input to the diode bridge is 230VAC). Whereas if the input is 115vac, I get around 110VDC after the filters.
I guess i am really just making sure that the 'ac in 220v' on the schematic (ef800/PSU249PEF800) is not a typo.


Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on June 26, 2015, 10:34:06 AM
If you run the transformer in parallel to halve the voltage going to the B+ filtering you will also halve the voltage going to the heater supply.

I'm not sure i follow? This design uses two separate transformers right? One for the B+ , which can have it's primaries wired in series or in parallel, depending on whether you are in the US or Europe, and then a second separate transformer for the
H+ which again can be wired or switched for 110V or 230 use.
My question was regarding why 220vac was chosen for input to the B+ diode bridge.
220vac rms gives a peak voltage of about 320VDC, so we are having to drop around 215VDC to get to the 105VDC plate voltage, which seems like a lot to me. I was just wondering if other people have built this power supply successfully and achieved the desired plate voltage.
I've just simulated the circuit using Multisim (see attached) and there appears to be about 220VDC after the filtering (if the input to the diode bridge is 230VAC). Whereas if the input is 115vac, I get around 110VDC after the filters.
I guess i am really just making sure that the 'ac in 220v' on the schematic (ef800/PSU249PEF800) is not a typo.

it is not a typo,
when designing tis one I had long Chat with Oliver , and regarding the power that is what I have been recommended for B+ in this setup ,  the EF800 configuration operates better with a nice upstream potential, like having a waterfall just before the river so it make the tube stable and quiet ,  so don't worry , I have one working here and do know that this is done for a reason ,
Hope this helps,
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on June 26, 2015, 11:14:20 AM
it is not a typo,
when designing tis one I had long Chat with Oliver , and regarding the power that is what I have been recommended for B+ in this setup ,  the EF800 configuration operates better with a nice upstream potential, like having a waterfall just before the river so it make the tube stable and quiet ,  so don't worry , I have one working here and do know that this is done for a reason ,
Hope this helps,
Best,
Dan,
[/quote]

Thanks for the reply, I just noticed that the 160K is in parallel with the plate resistors and plate resistance! It makes perfect sense now. A bit of Thevenin shows a plate current of around 2mA.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on June 26, 2015, 11:52:38 AM
If you run the transformer in parallel to halve the voltage going to the B+ filtering you will also halve the voltage going to the heater supply.
I'm not sure i follow? This design uses two separate transformers right?

You are absolutely right. My apologies... I glanced at the PSU schemo and assumed incorrectly that it was based on an Alctron type PSU mod and I was referring to the type of transformer that comes in those PSUs.

I knew that Dan's D-E47 design was using an built from scratch PSU but temporarily forgot about that when I replied to your question.

I was simply wrong and the reply does not apply to this project. I am sorry about that and I am glad you pointed this out. :-S

Thank you.




edited to fix quote block formatting
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on June 30, 2015, 05:16:27 AM
If you run the transformer in parallel to halve the voltage going to the B+ filtering you will also halve the voltage going to the heater supply.
I'm not sure i follow? This design uses two separate transformers right?

You are absolutely right. My apologies... I glanced at the PSU schemo and assumed incorrectly that it was based on an Alctron type PSU mod and I was referring to the type of transformer that comes in those PSUs.

I knew that Dan's D-E47 design was using an built from scratch PSU but temporarily forgot about that when I replied to your question.

I was simply wrong and the reply does not apply to this project. I am sorry about that and I am glad you pointed this out. :-S

Thank you.



No problem at all trans4funks1!  I appreciate that you were trying to help.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on June 30, 2015, 08:17:16 AM
Just Updated the First Page , with this ,

D-EF47 Schematic Thanks toTrans4Funks1
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d0281994694.pdf
Thanks for the Awesome Work,
Best,
dAn,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: AusTex64 on June 30, 2015, 10:29:53 PM
Is there a preferred method of ground/shielding these 7 pin mic cables? I'm getting a slight ground buzz in my Oliver alternate u47 ef14 (cs4) mic with both shields connected at the binder connectors.
Edit: apologies Dany, I thought this was the DIY ami u47 thread.

Are ground and shield connected on the cable?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: duantro on July 02, 2015, 12:30:05 AM
Is there a preferred method of ground/shielding these 7 pin mic cables? I'm getting a slight ground buzz in my Oliver alternate u47 ef14 (cs4) mic with both shields connected at the binder connectors.
Edit: apologies Dany, I thought this was the DIY ami u47 thread.

Are ground and shield connected on the cable?
Yes, they are connected. I remembered someone in Max's mk7 thread had referred to lifting  shield at  one end if, a ground loop was happening. I need to trace my ground paths, and see where it's coming from.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 09, 2015, 12:57:37 AM
Hey guys - I seem to be having some trouble with my PSU...

I haven't built the mic yet so these readings are not connected to a mic.  I am getting B+ 103V(can't get it any higher), and H+28.9.  Turning the H+ trimpot, it goes from about 28.9 to 32.  I checked and rechecked every connection, wire, and solder point, and I cannot figure this out.  Also, I think its normal, but when i switch between polar patterns, the B+ jumps up about 100V.

Also something of note, my 220V input is reading about 275V on my meter.  Is that normal?  The 20V input is reading around 25V.

Any thoughts or direction would be much appreciated!  Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 09, 2015, 03:01:17 AM
sounds like you may have the multimeter not selected to AC when measuring 220v?, a bit over is normal for 20v to be 25v but not 275v!
what is the voltage rating of the first Cap? hope its not 250v or you may be in trouble.
Sounds like your testing without load resistor as well, having load will bring down your voltages to the correct amount.
You sure your testing with MM on AC rather than DC?

regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Matt Nolan on August 09, 2015, 06:46:06 AM
Hey guys - I seem to be having some trouble with my PSU...

I haven't built the mic yet so these readings are not connected to a mic.  I am getting B+ 103V(can't get it any higher), and H+28.9.  Turning the H+ trimpot, it goes from about 28.9 to 32.  I checked and rechecked every connection, wire, and solder point, and I cannot figure this out. 
The H+ might be OK. Try running it with a dummy load rather than open circuit.

Quote
Also, I think its normal, but when i switch between polar patterns, the B+ jumps up about 100V.
This is not normal. Check your wiring again.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 09, 2015, 11:35:54 AM
Thanks guys for the quick replies!!

I snapped some pics to show whats going on.   I checked wiring on everything, and it all looks accurate (according to the diagram on pg 3).  I just want to make sure that when I plug the mic in, it won't ruin anything. 

Still not quite sure why I'm getting such a high AC voltage at 270VAC...  Maybe bad transformer?

Also, could my polar switch be wired incorrectly causing the voltage to jump 100 VDC between the two settings?

Thanks
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 09, 2015, 11:37:16 AM
Shot with volt meter.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 09, 2015, 12:09:38 PM
Take a look at this:

http://groupdiy.com/index.php?topic=51308.msg652017#msg652017
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tubestation on August 09, 2015, 01:04:33 PM
Hello,
Wimmy, are You living in a 230 or 115 Volt Mainvoltagecountry ?
If You have 230 ( or 115 ) Volt AC at the Primary  of Your Powertransformer and the Secondary reads 270 VAC  when 230 VAC  are rated for the Transformer, there Must be something  wrong with him. Could be shorted Windings on the Primaries or a wrong Windingpattern from the Factory. I would check the Tranny first, unconnected  from the Powersupply.
To meassure Voltages without a Load ( Tube or Replacementresistors )  don t shows You the Voltagedrop of Your RC Network because If no Current flows, no Voltagedrop. If You  " Activate " Your passive Powersupply without the Mic connected and than plug the Mic, the  Filamentwire of the Tube melts, the Tube is destroyed., because of the much too high  Heatervoltage You have without the Load of the Filamentwire . If You ever  activate  a passive  Powersupply without a Mic plugged, make sure all  Heater Capitors are discharged ! ! !  before You plug the Mic otherwise You may need a new Tube. I discharge Capitors with a Lightbulb  in a Socket with  isolated Cables  a 100 Ohm  5 Watt Seriesresistor and Crocodileclamps ( to Plus and Minus of the Capitor ) I don t know If the Capitors like this fast Discharge very much but it works and a few Seconds later the Capitor is discharged.. You can also use only a Bleederresistor ( I would say 500-1k Ohm but not sure, maybee Somebody could confirm, please ) from Plus to Ground to discharge  but I prefer  to  let  the Lightbulb  to " consume"  the  Charge. Just to Off the Powersupply and waiting won t help because a good Capitor can hold the Charge  ( the high Voltage that kills Your Heater ) for Hours .
Hope I didn t answer Questions Nobody asked.
Greatings
Lothar
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 09, 2015, 01:27:16 PM
i had a similar problem once, i wired the transformer the wrong way round!!, maybe you've done the same?

looking at your picture your IEC doesnt look right!!!!! is that two wires coming off it and one going to the txf and one going to the pcb?
you should be putting the fuse on the live (brown) wire side i thought?
from your IEC there should only be blue(neutral) and brown(live) coming off to the txf, but obviously the brown(live) going to the fuse before then going to the txf.
i would unsolder and start again or put some more detailed photos of the IEC.

regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 09, 2015, 02:14:59 PM
Right now I have the primary wired in parallel for 120V.  Brown and grey going to the cold terminal of the IEC, and blue and purple going to one side of the switch.  That should be correct, right?  The other wire i think you are seeing is the wire to the primary of the other xformer. 

Also, with the secondary unhooked from the PCB, I'm still getting 270 VAC.  I think I'm just going to order a new one and report back.

Thanks so much for your help!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on August 09, 2015, 03:01:45 PM
Ah, I didn't realise you are on 110v, one other thing is normally I would use a DPDT switch, I think your using a SPST?
Are you testing the txf without it being plugged into the pcb? If not I would try this, try and keep it as simple as possible so it can only be the transformer at fault.
Sounds like you have it connected right but I can't see the wiring guide for it?

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 09, 2015, 04:39:20 PM
Thanks guys for the quick replies!!

I snapped some pics to show whats going on. 

(http://groupdiy.com/index.php?action=dlattach;topic=56878.0;attach=36178;image)

When  comparing your photo to this data sheet: http://www.mouser.com/ds/2/410/VPT230-110-224265.pdf it appears that you have wired the secondary in series when it seems it should be in parallel just as you have connected the primary.

If the transformer secondary is wired in series it is specified in the data sheet to output 230 volts. It seems to makes sense that you are measuring 268+/-aAC as you have shown in the second picture.

Try wiring the secondary in parallel to see if that gets you in the proper range.

After you have done that try connecting a load, as suggested in the link I posted earlier today, to see how close you are you the operating voltage.

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 09, 2015, 04:55:42 PM

...according to the diagram on pg 3...



The diagram on page 3 does not apply your project for one obvious reason and one other small detail.

The obvious detail is that the diagram is describing a primary connection to a 230vAC mains supply and a step down to 115vAC on the secondary.

The other small detail is that the color code for the transformer displays the primary and secondary in the opposite orientation from the products data sheet. In other words, the BLACK, ORANGE, RED and YELLOW wires shown on that diagram as the primaries are shown as secondaries on the data sheet. Swapping the orientation may or may not matter with a toroidial transformer. If I recall correctly, swapping primaries and secondaries in traditional E core transformers can lead to slightly more hum. In any event, it seems like it would be less confusing to follow the conventions described by the data sheet.

I hope this helps.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 10, 2015, 10:19:36 AM
Hey trans4funk1,

I think i'm a bit confused...  Doesn't the data sheet indicate that grey brown blue and violet are the primary side?  Thats what I have wired up now to my IEC and switch, and the data sheet indicates that is the primary side. 

When I wire the secondary in series, I only get 135 VAC.  I've got another transformer in mail, maybe this is just a case of a bad transformer.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tonzauber on August 10, 2015, 12:12:14 PM
[...] one other thing is normally I would use a DPDT switch, I think your using a SPST?

Hi Spence, wouldn't a DPST make more sense?

Best, Georg
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 10, 2015, 02:53:43 PM
Hey trans4funk1,

I think i'm a bit confused...  Doesn't the data sheet indicate that grey brown blue and violet are the primary side?  Thats what I have wired up now to my IEC and switch, and the data sheet indicates that is the primary side. 

It was the diagram on page 3 that has the colors of the primaries and the secondaries swapped. Yes, your photo of your build looks like you are following the color code suggestion of the data sheet.


When I wire the secondary in series, I only get 135 VAC.  I've got another transformer in mail, maybe this is just a case of a bad transformer.

Maybe I am confused. :-)

Your photo of your build shows that your secondary is wired up in series. The second photo shows that you are measuring 268vAC. That makes sense and agrees with the dadt sheet specs. The 230vAC output catalog spec for that transformer is assuming there is a load on the circuit which is pulling the voltage down... down to the 230vAC spec.

Have you tried wiring the secondary in parallel? I would expect you will see about 135vAC when you do. 135vAC seems like the proper output of an unloaded transformer in this circuit. The bridge rectifier will crank it up 1.4x to 190vDC and the filtering, the trimmer and the load should bring it back down to desired 105vDC B+.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tonzauber on August 10, 2015, 03:09:07 PM
Regarding the 230V on the rectifier input:


it is not a typo,
when designing tis one I had long Chat with Oliver , and regarding the power that is what I have been recommended for B+ in this setup ,  the EF800 configuration operates better with a nice upstream potential, like having a waterfall just before the river so it make the tube stable and quiet ,  so don't worry , I have one working here and do know that this is done for a reason ,
Hope this helps,
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 10, 2015, 05:51:40 PM
Hey Tans4funks1,

For a dummy load, I calculated a 12 Ohm 2 W resistor for the H+.  With the load, it brought the voltage down to around 5 or 6 volts DC, so it should be good there. 

For B+, i tried a 550k 1/4 W resistor which didn't change anything on the VAC input.  I also tried a 120k and that didn't change the VAC input either.  AND, I'm still getting about a 100VDC jump when I switch polarity patterns...  Is that just because there is no capsule in the circuit?

Thanks!

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 10, 2015, 06:47:31 PM
Edit to explain: I wrote this before the last  reply was posted but I had trouble uploading it, so some of it may seem as if I didn't read the previous post. :-)


Regarding the 230V on the rectifier input:


it is not a typo, ...
Best,
Dan,


Ah yes, now I  recall that Dany wrote about this previously.

I should back out and defer to Dany and I suggest you ask him again for clarification about this.

Never the less I think that wimmy's existing transformer is acting exactly as it should be expected to act. I didn't understand the context of the concern with trying to match the 220v note on Dany's schematic.

Having said that I just ran a simulation of the circuit shown on the schematic and without a load it appears to me that the voltage at R7, with the trimmer set at 8Kohm and without a load from the mic circuit, will be somewhere in the vicinity of 250vDC. I can't imagine the load of the mic pulling that down to 105vDC. Using a 150kOhm 1/2 watt load resistor will provide an idea of what plugging the mic will do to the B+.

I've been trying to be helpful, but now I regret adding to confusion when it seems that only Dany can confirm what we should expect to see in his circuit design.

Good luck.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tubestation on August 10, 2015, 07:53:42 PM
Hello,
Do You have also no DC Voltagedrop with the 150k Dummyload, installed ( from B+ to 0 Volt ) ? that would be strange.
The Relay inside the Mic just  switch the Reardiagramm. It only connects the Reardiagramm with the Frontdiagramm in Omni Mode. In Cardioid the Reardiagramm  Isn t in the Signal at all. The Capsule doesn t pull any Current. How can You have a 100 Volt Jump of B + when switching ?  It doesn t Matter for Your Voltages If the ( correctly operating ) Capsule is installed  or not. If You have any Short  or a  bad Isolation inside the Capsule , If Current flows to 0 Volt than You can have a  big Voltage Jump. ( Drop ) .
When does it happen ? In Ommni or in Cardioid Mode ? I am pretty sure You find the Problem in the Powersupply. Maybee a wiring Error or  a cut or shorted Trace, Maybee in the Relayswitching Part,? because You obviously have a Problem  when switching .
Like Trans 4 Funk suggested use a 150k Dummyload  for B+ and Your calculated 12 Ohm for  H + and check Everything  for Isolation and Continuty before You plug the Mic. I hope You didn t blow  more than 80 Volts to  the Capsule. If so , maybee the Diaphgram got sucked into the Backplate . Do You have a cheap Spearcapsule for Your Testings?  ( after beeing 100% sure that Your Powersupply works like it should )
Good Luck,
Lothar
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 11, 2015, 12:08:56 AM
So i did some more testing tonight with the dummy load, and feel good about my H+.  The B+, however, is a complete mess.

In Cardoid, with a dummy load, i get 70VDC.  In Omni, with a dummy load, it climbs up to about 170VDC (until i turn it off, it just keeps rising.)  I've checked and rechecked everything to make sure there is no solder bridging or shorts.  Could it be my switch wired improperly?  I've got COM going to the inner lug (pole) of the C&K switch, and OM and CAR going to the outer lugs (2pos).  Am I missing something? 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Matt Nolan on August 11, 2015, 05:49:25 AM
I think I may have a clue as to what is going on here.

The relay coil, if you're using the one specified, takes about 4mA - the rest of the mic probably draws about 1mA and the bleeder 160k draws about 0.65mA - about 5.7mA total draw on the B+ supply from the node at C9, R8, R7. If you are not using a mic, but using a dummy load for the B+, you also need a dummy load of around 12k for the relay connection, otherwise when you flip the pattern switch to energise the relay, the draw on the overall B+ will drop by 4mA and the voltage will shoot up.

When the pattern switch is set such that the relay is not energised, the 4mA goes through R9 instead, keeping the static current draw on B+ constant.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 11, 2015, 09:01:11 AM
FWIW, I added a "load" in parallel to R7 in a simulation and see that the B+ does indeed drop right down town 105vDC.

:-S

This is the second time I  tried to help and goofed up  this thread. My apologies.

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Matt Nolan on August 11, 2015, 09:31:26 AM
Sorry, I mis-typed in my post above - corrected it now. 12k, not 12 ohms for the relay coil resistance.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: geebeeVIE on August 12, 2015, 07:45:01 AM
Forgive my stupid question,
but: How do I hook up the capsule in this build?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on August 12, 2015, 10:03:18 AM
(https://dl.dropboxusercontent.com/u/43869772/D-EF47/D-EF47%20Capsule%20Connection%20Scheme.JPG)

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d02819946dc.jpg)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: geebeeVIE on August 12, 2015, 02:53:45 PM
Thank you  :-) Can't wait to hear it...

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 21, 2015, 09:29:43 AM
NEWB ALERT!

Sorry in advance, but I'm getting some weird things with my first fire up.
My H+ is showing the right voltage at 5.05V, and it is showing up at pin 5 of the tube.  My B+ is showing 105V at the mic pad, but is also showing 105V at pin 7, 8, and 9 of the tube.  Is that normal?  I'm also not seeing the tube lighting up at all!!  With the correct voltage at the heater, shouldn't I be seeing the the filament lighting up?  I've checked for for shorts in the cable, and checked for continuity where it should be, and it all looks correct. 

I should note, I have an EF800 tube, and a K67 capsule from an old Apex 460 (for testing purposes).

Anyone have any thoughts?

Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on August 22, 2015, 02:57:08 PM
Took a couple readings today...

Voltages at each pin of the EF800

1 - 1.098V
2 - 23mV
3 - 1.108V
4 - 5.05
5 - 30mV
6 - 29.8mV
7 - 105V
8 - 105V
9 - 105V

B+ 105V
H+ 5.05V

Backplate Voltage - .54V

Clearly my BP isn't getting the correct voltage, and my tube filament is still not lighting up.  I've double checked and triple checked wiring, and can't figure anything out.  I've measured for continuity to ground at all of the appropriate spots, and it looks great. I've cleaned and resoldered each questionable solder joint.   But, I still can't get this to be right.  Does anyone have any ideas i can start exploring?  Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Banzai on August 22, 2015, 08:23:03 PM
That's a dead tube. Try a new one before doing anything else, as the rest of your build is probably fine.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on August 26, 2015, 11:10:16 AM
FWIW, I added a "load" in parallel to R7 in a simulation and see that the B+ does indeed drop right down town 105vDC.

:-S

This is the second time I  tried to help and goofed up  this thread. My apologies.

I was confused by this a while ago but Indeed, when you put the plate resistance in parallel with R7, it all makes sense. I used Thevenin's theorem. I haven't had much luck simulating the circuit properly as i don't have good EF80 model in Multisim. What simulation software are you using? Perhaps I just need to estimate some resistances and capacitances and simulate using discrete components instead of a tube.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: trans4funks1 on August 28, 2015, 09:41:34 AM
I was using Duncan PSU designer and an estimated load value.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: afdobbert on September 02, 2015, 09:59:30 PM
Can I get a confirmation that when using an AMI BV08r:

1. Orange is p+
2. White is p-
3.  Green is s+
4. Black is s-

Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on September 03, 2015, 09:42:37 AM
Yes, I believe that's correct.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: afdobbert on September 03, 2015, 11:54:08 AM
So, this is what I have for the pin out of the mic. I can't figure out what pin 3 is for the life of me. If anyone can shed some light, I'd really appreciate it. I'm very much a beginner.

Pin 1: A-
Pin 2: A+
Pin 3: ??????
Pin 4: H+
Pin 5: B+
Pin 6: PTRN
Pin 7: GND
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on September 03, 2015, 12:55:05 PM
I believe pin 3 is another ground connection.

There is a jumper on the PSU PCB named 'SHLF' which you can use to ground lift the shield/ground on pin 3 if necessary. I guess so you can have separated 0V electronic ground and housing/chassis/XLR ground. It could also be possible to have adedicated heater ground on pin 3, which connects with the other grounds at the 7pin XLR socket on the PSU.

But inside the mic you can connect pins 3, 7 and the connector housing together to give you as much copper as possible for the ground path.

 At least that's what I think is intended, someone please correct me if I'm wrong!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on September 16, 2015, 11:56:16 AM
Thanks Banzai!  Turns out it was a bad tube.  I threw another one in there and it fired right up.

I am having a small problem with my B+....  The highest voltage I can get is 94 VDC.  Any thoughts or recommendations?

Thanks
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on September 16, 2015, 12:42:12 PM
Thanks Banzai!  Turns out it was a bad tube.  I threw another one in there and it fired right up.

I am having a small problem with my B+....  The highest voltage I can get is 94 VDC.  Any thoughts or recommendations?

Thanks

PSU PCB
can you confirm this configuration ,
B+
R1 = 20K 2W
R3  = 20K 2W
R8 = 25K pot.

if so then you could reduce the value of R1 and R3 on PSU PCB respectively to allow some more voltage to show up at B+ asuuming all is correct ,
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on September 16, 2015, 12:53:36 PM
new picture Added on page 1 for capsule connection ,

Picture Refers to dual tube version but the same Scheme applies to the D-EF47  just forget about the other tube except that all the same

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d0281994718.jpg)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wimmy7986 on September 16, 2015, 05:39:59 PM
Thanks Dan!

I checked those parts out, and they are correct in my PSU.

What would you recommend I replace them with value wise to get the voltage up?  18K?  I don't have any 2W resistors on hand so i will have to order some stuff.

Thanks
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on October 01, 2015, 04:44:51 PM
Can someone point me to the correct replacement for the following part:

Vishay/Sprague V-730P105X9250

It is not available on the Mouser BOM. Has anyone found a direct replacement?

Also, What are people using for labeling the polarity switch on the PSU? label maker? Anything with the actual polar patterns on them?

Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on October 06, 2015, 11:46:41 AM
Can someone point me to the correct replacement for the following part:

Vishay/Sprague V-730P105X9250

It is not available on the Mouser BOM. Has anyone found a direct replacement?

Also, What are people using for labeling the polarity switch on the PSU? label maker? Anything with the actual polar patterns on them?

Thanks!

what about this one ,

http://ca.mouser.com/ProductDetail/Vishay-Roederstein/MKT1813510255/?qs=sGAEpiMZZMv1cc3ydrPrF9YnoK4MhZ%252buq9jXZORPslk%3d

Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on October 07, 2015, 08:51:09 AM
Excellent! Thanks. This is my first mic build. Still waiting parts to come in.

I noticed that there weren't any mounting screws for any of the connetors that mount to the PSU chassis.

Is there a standard screws-bolts/size/head that is used for mounting everything? Special macine bolts or can I pick them up at the hardware store?

Sorry if these are simple/dumb questions.

Thanks
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on October 07, 2015, 10:00:52 AM
^Nevermind on the screw question. Figured it out.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on October 11, 2015, 05:01:06 PM
I'm having a problem figuring out  which way an AMI T47 transformer mounts on the board.  The transformer itself has no indication of which pins are A-B or C-D.  I looked at AMI's website and they show a bottom pic of the transformer with A-B and C-D but there is nothing that indicates which pins are which.  How can I determine A-B and C-D on the T47?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Matt Nolan on October 11, 2015, 07:10:20 PM
I'm having a problem figuring out  which way an AMI T47 transformer mounts on the board.  The transformer itself has no indication of which pins are A-B or C-D.  I looked at AMI's website and they show a bottom pic of the transformer with A-B and C-D but there is nothing that indicates which pins are which.  How can I determine A-B and C-D on the T47?
Inject small signals across various pairs of pins and measure or scope the remaining pair. After a few attempts, knowing the supposed ratio of the transformer, you can work out what is what. Difficult to tell phase without a scope though...
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on October 12, 2015, 08:45:46 AM
I'm having a problem figuring out  which way an AMI T47 transformer mounts on the board.  The transformer itself has no indication of which pins are A-B or C-D.  I looked at AMI's website and they show a bottom pic of the transformer with A-B and C-D but there is nothing that indicates which pins are which.  How can I determine A-B and C-D on the T47?
see attached pic. the T47 spec sheet shows the pins labelled A,B,C,and D. As does the PCB, but it is a bit confusing which pins are which on the transfomer itself. Pin A is the one closest to the 'T' in T47 on the pins side of the transformer.
Hope this helps!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on October 12, 2015, 09:15:00 AM
I'm having a problem figuring out  which way an AMI T47 transformer mounts on the board.  The transformer itself has no indication of which pins are A-B or C-D.  I looked at AMI's website and they show a bottom pic of the transformer with A-B and C-D but there is nothing that indicates which pins are which.  How can I determine A-B and C-D on the T47?
see attached pic. the T47 spec sheet shows the pins labelled A,B,C,and D. As does the PCB, but it is a bit confusing which pins are which on the transfomer itself. Pin A is the one closest to the 'T' in T47 on the pins side of the transformer.
Hope this helps!

Thanks so much.  :)  Just the info I was looking for.  Take care.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: vinylwall on October 12, 2015, 05:43:14 PM
Well that's a bummer.  I mounted the T47 transformer on the board, but it is too tall to fit inside the 47 style mic bodies I got from Andrew in Lithuania.  I also tried it in an MK-47 body from Chunger and it won't fit in that one either.  Are you using some sort of trick to mount the PCB in the body?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jackinthebox on October 12, 2015, 06:13:13 PM
Well that's a bummer.  I mounted the T47 transformer on the board, but it is too tall to fit inside the 47 style mic bodies I got from Andrew in Lithuania.  I also tried it in an MK-47 body from Chunger and it won't fit in that one either.  Are you using some sort of trick to mount the PCB in the body?
what diameter is the body? if your transformer is fitted on the opposite side from the tube, you just need to make sure the transformer sits between the side rails. I've attached another picture which might help.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on October 13, 2015, 08:38:19 AM
Well that's a bummer.  I mounted the T47 transformer on the board, but it is too tall to fit inside the 47 style mic bodies I got from Andrew in Lithuania.  I also tried it in an MK-47 body from Chunger and it won't fit in that one either.  Are you using some sort of trick to mount the PCB in the body?
what diameter is the body? if your transformer is fitted on the opposite side from the tube, you just need to make sure the transformer sits between the side rails. I've attached another picture which might help.

The PCB was specifically design to have package for AMI BV08 Classic Series and AMI T47 Transformer ,
Other transformer can be fitted as well.  Here is the 2 Mounting Strategies that will permit the Use of about any transformer.
 
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d028199479b.zip

from page 1 of this thread,
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tommypiper on October 14, 2015, 09:06:02 PM
Dan, will Max's Bv.08 work in this project?  Will it mount to your PCB? 

Can this build be made with an EF-804-S?  (It's such a good tube, and made specifically to avoid microphonics, I've been surprised no one has yet designed or built a microphone with this tube.)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: opacheco on October 15, 2015, 10:22:16 PM
I have a question about the output transformers for this project.

Look like there are four transformers  BV8N, BV8R, T8, T47 and these fit in the board.   
Can anyone talk about how these transformers will effect the sound quality?

Any comment?
Opacheco.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jafo on October 16, 2015, 06:04:45 AM
Dan, will Max's Bv.08 work in this project?  Will it mount to your PCB? 

I have both here, pcb and xformer.
The mounting holes fit but the pins are different. You have to turn the xformer around and wire it to the pcb.
Best solution woud be a little helper-breadboard, where you lead the xformer-pins to a separate solder point. Otherwise you
have to solder the wires direct to the xformer...

Im waiting for the body and saving money for a capsule right now.
Will build the same combination. Max´s BV.08, D-EF47 PCB, with Thiersch-capsule in Andrew´s body   :)

Jan

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: opacheco on October 17, 2015, 11:18:56 AM
Any comments??

Opacheco

I have a question about the output transformers for this project.

Look like there are four transformers  BV8N, BV8R, T8, T47 and these fit in the board.   
Can anyone talk about how these transformers will effect the sound quality?

Any comment?
Opacheco.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: opacheco on October 17, 2015, 11:26:13 AM
Any comments??

Opacheco

I have a question about the output transformers for this project.

Look like there are four transformers  BV8N, BV8R, T8, T47 and these fit in the board.   
Can anyone talk about how these transformers will effect the sound quality?

Any comment?
Opacheco.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on October 19, 2015, 11:05:27 AM
opacheco

your inbox is Full,
D

PS: I will fix the Web inventory,
Edit , it is fixed now ,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: opacheco on October 19, 2015, 09:53:56 PM
Dan,
I so sorry for my full inbox; I will repair that now!

Thanks a lot for your time and help with this trouble.

Opacheco.

opacheco

your inbox is Full,
D

PS: I will fix the Web inventory,
Edit , it is fixed now ,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on January 17, 2016, 11:00:34 AM
Started working on this build. Got as far as I could go without mounting hardware. Just ordered a body from the talented Andrew.

Thank to both Dany and Andrew for making this project possible!!!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on February 01, 2016, 11:37:56 AM
Can anyone offer the wire they used to wire-up the PSU? Are there generic wire kits of various gauges and lengths, or will I need a few small spools of what is needed? If so, what kind/types for this project?

Next, is I understand it is possible to use either the 24V(red) relay and rcoil resistor, or the 48V(silver) relay and matching resistor. How does one know which to choose? I purchased both and ended up mounting the 24V, but am not clear on if this is the best choice. 

Also, I ordered EF800 tubes online, but was wondering if anyone knows where to get good tested EF800 tubes for this type of application?

Thanks all and please forgive my noob questions.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Phrazemaster on February 28, 2016, 08:31:46 PM
Regarding the wire, folks like different stuff but I'm a fan of silver-plated copper wire with teflon insulation. I use about 24AWG for most hookup stuff, sometimes as low as 18AWG for stuff coming right off mains. I buy mine from bulkwire.com or Apex Junior; can google these for exact sites.

I don't know if Bowie (guy here on the forum) has the EF800 tubes but if so I would consider buying from him because he thoroughly tests most tubes. He's a little pricier but you get what you pay for.

I can't speak to the resistor questions.

HTH,

Mike

Edit: Forgot to mention - if you do go the teflon SPC route (silver plated copper wire), consider getting a thermal wire stripper. Teflon is notoriously difficult to strip, although some guys have a system for it other than thermal strippers. I bought one and never looked back! You never nick the conductor either, if you do it right.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: afdobbert on February 28, 2016, 09:37:02 PM
Just have to say I've had my D- EF47 mic finished now for a few months, and it is the most beautiful mic I could ever dream of owning. I have a Thiersch M7,  EF800, and Oliver's classic BV08 in mine...it is such a stunning mic. I started DIY about a year ago with the dream of owning a U47-style mic, and here it is a year later and I have it. This forum really is an amazing place with some really special people. Thanks again, everyone!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on March 14, 2016, 03:47:26 PM
I have been updating some of the capsule connection picture on page 1  as they were some errata in one of them
all fixed now , if you have a working mic then please ignore this post  ;)
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on March 14, 2016, 11:59:37 PM
Phazemaster! My Man! Thank you so much for the reply. Ive been busy lately, so sitting on this project hasn't been too bad. Gonna get the wire tonight. Ive been essentially following Vinylwalls PSU build. I liked the case with precut holes with binder. His is very neat and clean. His can be seen on page 4.

So, for this PSU, I can use 24AWG for the binder connectors, and power components or should I get 18AWG for power from mains? I have spare Gepco 8pr pieces. Its 24AWG. (GA72408GFC to be exact). Would this stuff work if I stripped a few pieces out?

For the XLR connector to PCB on the PSU, can I use a small strip of the Gepco 8pr?

Same for inside the mic body? Connecting the PCB to the Mics connector?



I purchased 3 tubes online a few months back. I sourced them from the site below. They arrived well packed and fresh.

http://www.nostubestore.com/2011/10/telefunken-ef800-germany.html

I'll look into Bowie if anyone thinks the place I got mine might give me issues.

I really do appreciate all the help. As afdobbert said above, this is a special place!

Thanks!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on May 08, 2016, 12:44:41 PM
Mine is ready finally! Aputis body, my DIY PSU enclosure with dual toroid, AMI BV08, Beesneez K7, sounds great, with very low noise level. Thanks to Dany/Oliver(R.I.P.) for the project!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on June 10, 2016, 08:07:40 AM
Hi,

I need your help, because i am lost...
I made this beautiful D-EF47 project, and i have this issue :
- On Omni mode (switch of PSU on left side), the mic works perfectly..
- On Cardioid, i had a big noise who stopped and now i have this low crackle, only on this mode..
DO you have any idea which process i can use to solve this ?
Thanks

Hugo
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Matt Nolan on June 10, 2016, 08:15:06 AM
Check everything systematically. Probe voltages, try removing and re-installing the capsule wiring with the two sides wired the other way around (so the front becomes the back and vice versa). Try temporarily substituting the capsule halves with 50 to 100pF capacitors. Report back!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on June 10, 2016, 08:20:33 AM
Check everything systematically. Probe voltages, try removing and re-installing the capsule wiring with the two sides wired the other way around (so the front becomes the back and vice versa). Try temporarily substituting the capsule halves with 50 to 100pF capacitors. Report back!

Thanks I will change the side of capsule, i'll tell you if it is ok.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on June 12, 2016, 03:13:25 AM
I have just one more question...I removed some paint on the PSU, to make contact between the top and the bottom, i also removed paint behind the PSU/Mic 7pins connector. I did not make it for output xlr, but there is a good contact through the screws.. Is there a reason for my mic is "clicking" and the noise changes when i touch the metal top of psu ?...
Hugo
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on June 12, 2016, 08:03:07 AM
Defiantely you have some problem with grounding.
Did you make test with fully assembled microphone?
Or at least with the headbasket mounted?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on June 12, 2016, 08:18:08 AM
Defiantely you have some problem with grounding.
Did you make test with fully assembled microphone?
Or at least with the headbasket mounted?

Hi, thanks for your help... I made my test just after calibrating the PSU... Yes for sure there is a grounding problem..but where may i have to check if there is a missing contact somewhere ?
Thanks a lot.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on June 12, 2016, 09:24:10 AM
All the circuit ground points i would check with the beeper, all the metal connections and points where it meets.
Headbasket grounding is really important.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on June 12, 2016, 12:57:56 PM
All the circuit ground points i would check with the beeper, all the metal connections and points where it meets.
Headbasket grounding is really important.

Great thank you
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wilberweb on June 21, 2016, 12:14:39 AM
Hi, I'm new to this forum. I'm building Dan's D-EF47 mic and power supply coming down to the XLR 7 pin and 3 pin hook ups. does any one have good pictures of the b+ h+ and XLR hook ups, here is what I have so far. just waiting for the wire.

thank you
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on June 30, 2016, 04:34:59 PM
Hi, I'm new to this forum. I'm building Dan's D-EF47 mic and power supply coming down to the XLR 7 pin and 3 pin hook ups. does any one have good pictures of the b+ h+ and XLR hook ups, here is what I have so far. just waiting for the wire.

thank you

Here are my pics:
(http://kepfeltoltes.hu/160630/DSC03112_www.kepfeltoltes.hu_.jpg)
(http://kepfeltoltes.hu/160630/DSC03109_www.kepfeltoltes.hu_.jpg)
(http://kepfeltoltes.hu/160630/DSC03110_www.kepfeltoltes.hu_.jpg)
(http://kepfeltoltes.hu/160630/DSC03111_www.kepfeltoltes.hu_.jpg)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: useme2305 on August 24, 2016, 09:37:00 AM
quick question regarding the PSU.

i'm in a 230V country. i have the toroidal from Triad which gives me 260V on the secondaries.
when i reverse it and use the secondaries as the primaries and vice versa i can get 210V.
which voltage would be better for this PSU?  260V or 210V?

also, is it ok to use this particular toroidal transformer in reverse to get the desired voltage?

i know i could just skip the toroidal in this case but i wanna make this build future proof in case it needs to be ran by 115V.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Matt Nolan on August 24, 2016, 10:00:04 AM
i know i could just skip the toroidal in this case
No! A transformer for isolation from the mains is a big plus in the safety books. Don't skip it even if the voltage you need is close to 230.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on September 18, 2016, 03:17:16 AM
Hi,
I have 6 transformers which have been designed specifically for this mic and valve, it's a B5887, if anyone's interested in getting one please msg me, they sound fantastic in this circuit.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on September 18, 2016, 03:31:11 AM
We have here a company who can create any kind of custom toroids, I asked them to make one for me with 2 secondaries( 230VAC/0.11A and  20VAC/0.5A), so I can save some space, you can see the pics above...

quick question regarding the PSU.

i'm in a 230V country. i have the toroidal from Triad which gives me 260V on the secondaries.
when i reverse it and use the secondaries as the primaries and vice versa i can get 210V.
which voltage would be better for this PSU?  260V or 210V?

also, is it ok to use this particular toroidal transformer in reverse to get the desired voltage?

i know i could just skip the toroidal in this case but i wanna make this build future proof in case it needs to be ran by 115V.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Ericbazaar on September 18, 2016, 03:35:49 AM
Hi Spence,

i'm interested in your transformer. will compare to the haufe one in my next build. the haufe has to much low end in these circuit, but it sounds fantastic with two 6028 tubes.

best
andreas
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on September 18, 2016, 05:14:47 AM
great stuff, i have messaged you.

regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on September 28, 2016, 02:23:32 AM
Hi All,
I am starting a new D-EF47, and i have one remaining CEK89 capsule on hands from last projects.
Can i use that capsule (described as a 32mm K67 capsule) for this project or will i have some issues ?.. Is there a big improvement by using a RK47 microphone-parts  capsule ?
Thank you
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on September 28, 2016, 03:33:45 AM
I wouldn't say about improvement, rather two different responses.
CEK89 looks like typical 32mm k67 used in most of chinese microphones.
These type of capsules works good with high polarisation (sounds better in rode NT1a than original edge terminated capsule), so you could think to rise voltage  a little. Anyway you will get very bright response with it.
Most wariants of K47 (if someone didn't screw copy of original design...) have bump in hi-midrange and top end is little bit falling.
With any type of k67 you can always tame high frequencies adding capacitor from plate to ground - 100pF-1nF range or build additional deemphasis network like in my project:
http://groupdiy.com/index.php?topic=63682.0
Even if you tame high freq response still there wouldn't be bump in hi-mid area.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on October 08, 2016, 04:25:37 AM
Hi all,
I have 3 of these B5887 transformers left for testing if anyone's interested, would really like some comparisons done against other types etc and some feedback, I've got 9 out there at the moment.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 08, 2016, 12:27:48 PM
Hey all,

This my first tube mic build, and I can't wrap my head around the wiring from the 7-pin connector on the PSU, to the cable, to the mic.

On the PSU 7-pin connector, I've got the ground tab and pin 7 connected, and wires running from pins 1-7 to the corresponding number on the PSU PCB's 8-position terminal block connector.   

On the cable connectors, I'm confused about pin 3.  Do I just connect the cable shield to pin 3 at each end, or do I need to tie it in with pin 7 at each end, and/or the grounding tab on the PSU end of the cable connector?   The build guide shows pin 3 on the microphone connector left disconnected, which I think is adding to my confusion. 

Any help for this newbie would be great.

Thanks,

C
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Zjcc56 on November 12, 2016, 11:59:53 AM
Hello all,

So I recently built this mic with a blueline m7 and a ami transformer and it is truely glorious, and also very sensitive and quite louder than my other mics

Anyways,  there has always be this buzz in it when it's in card mode, not a problem with loud sources like drums it's quite low but when recently doing a voice over project I had a quiet talker and when I put about 30db of gain on it the buzz makes it unusable. I've tried different cables pres and the ever dangerous ground lift to alleviate it but with no success. When I switch it to Omni it pretty much goes away it's still there but only if I max my gain out and at that point the noise floor hiss and anything happening within a mile is picked up (not really but you get the point?)

So I did basic trouble shooting
1. Change cables pres etc.
2. Checked grounds with a beeper, all seems well
3. Quick visual check, noting the to see here
4. Lifted xlr ground on the 3 pin and 7 pin
5. Removed shelf jumper

None of these things worked

However when I disconnected the relay (pattern) in the psu the noise went away.
So it's usable in card only which is what I use it in most of the time but I do like the pattern switching....

Any thoughts?

Edit: spelling and poor grammar
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on November 12, 2016, 03:05:28 PM
 Did you ordered from micandmod? If yes, you all have an issue with cardioid mode. But solution is on previous posts
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Zjcc56 on November 12, 2016, 03:23:23 PM
No I did not, i ordered the from vintigemicpcb. I have read that post though.
Am I supposed to get 0v when it's in card mode? When I measured the relay connection (the terminal block)  with the mic connected at the power supply I got around 18v in card and around 50v in Omni.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on November 12, 2016, 08:23:33 PM
No I did not, i ordered the from vintigemicpcb. I have read that post though.
Am I supposed to get 0v when it's in card mode? When I measured the relay connection (he terminal block)  with the mic connected at the power supply I got around 18v in card and around 50v in Omni.

sorry, it was on an other post : http://groupdiy.com/index.php?topic=63415.0
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Zjcc56 on November 13, 2016, 10:05:29 PM
So after re reading that thread and this one and a lot of pondering at work i have found my error,
the switch wiring was very close to my lamp so when i switched to card mode it would just pick up all the crap coming  off of it.
The solution in the thread hugo pointed me to would work OR i could just reroute the wires so when the relay line is floating its noise free.

if i was really anal about it i could get another rotary switch with more poles to simultaneously switch the pattern to 0V and the relay load thing in.

Thanks to Hugo and all those who posted in this thread before me for the information!

 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on November 13, 2016, 10:15:03 PM

i am not sure i totally get this but IIRC to relay return coil should always be connected to 0V  ?
i wish i had the time to check this mic and mod confusing tutorial in any case you should not use this mic and mod tutorial  :o
.#$%43&^%*&^*&^ :P

Edit : Yes sometime we have to make choice when routing  wire in PSU been there done that ,  :)


Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 15, 2016, 07:27:57 AM
Where can I find screws small enough to mount the AMI BV08 Classic to the PCB?  I've got it secured with a zip tie for now, but it's not ideal.  I think I need M2 screws, but can't find any that are long enough.

Thanks,

C
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 19, 2016, 09:34:05 AM
After a few bumps in the road and some advice from a couple of members here, we are up and running!  Time to burn in the tube.

Thanks all!

C

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Murdock on November 19, 2016, 11:17:32 AM
Looks great!
Mind telling me, what type of PSU case you used?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on November 19, 2016, 11:28:38 AM
After a few bumps in the road and some advice from a couple of members here, we are up and running!  Time to burn in the tube.

Thanks all!

C

Congratulation for your Build ,
the capsule you have looks awesome   ;) i bet it will sound terrfific  ;)
Best,
Dan,

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 19, 2016, 11:38:45 AM
Looks great!
Mind telling me, what type of PSU case you used?

It's a Hammond 1453B.  I was going to go with one of Dan's, but I wanted to give myself lots of space so I went with something bigger.

Thanks Poctop!  I bet the capsule will sound great.  A fellow Canuck builds them  :D
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wilberweb on November 19, 2016, 02:07:19 PM
Awesome colorblind. That mic and psu look great!!
Good job  :) :)

-Larry
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Phrazemaster on November 19, 2016, 02:57:35 PM
After a few bumps in the road and some advice from a couple of members here, we are up and running!  Time to burn in the tube.

Thanks all!

C
Looks absolutely smashing!!! Great job man!!!

Wishing you many happy hours of recording!!!  :-*
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on November 20, 2016, 03:57:12 AM
Where can I find screws small enough to mount the AMI BV08 Classic to the PCB?  I've got it secured with a zip tie for now, but it's not ideal.  I think I need M2 screws, but can't find any that are long enough.

Thanks,

C

You can use M3's, just retap the mouser L holders.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 22, 2016, 12:28:41 PM
You can use M3's, just retap the mouser L holders.

I'm referring to mounting the transformer itself, not the PCB to the mic rails.  The holes in the laminations are really small, but I think I found some screws on eBay that will work. 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on November 22, 2016, 07:28:43 PM
Hi Colorblind,
M2 x 18mm or 2/56 x 3/4" will get your transformer mounted properly.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 22, 2016, 09:58:40 PM
Hi Colorblind,
M2 x 18mm or 2/56 x 3/4" will get your transformer mounted properly.

Great, thank you!  Do I need to be worried about spacing the transformer far enough off of the PCB so that it doesn't make contact with the screws that fasten the PCB to the mic rails?

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on November 22, 2016, 10:16:29 PM
Great, thank you!  Do I need to be worried about spacing the transformer far enough off of the PCB so that it doesn't make contact with the screws that fasten the PCB to the mic rails?

I put a telfon spacer in betwee lam and screws and yes it is important
Best,
DAn,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on November 23, 2016, 09:14:49 AM
Thanks Dan, I've got some on the way. 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on November 28, 2016, 03:28:32 PM
Hi All
Just completed my Oliver Archut U47 and have a question.  It seems to be working, but it needs like 50-60 dB gain to get it in to a
semi reasonable signal.  Of course that increases the noise as well.  It's my first tube mic, so don't have a benchmark to compare.
The question is if that is normal.  It does not make any loud cracking or popping or anything like that, but compared to poctop/chunger's U87 I built which needs about 30-40 dB gain, it's downright dead.  It also sounds a bit dull compared to the 87.   I'm using the AMI BV08R transformer and tskguy's capsule in an Aputis body.   The tubes are NOS from NATO.  I have six of them and am burning them for 12-15 hours.  Is that the way it is supposed to sound or am I missing something?  Of course, I suspect the tube, but just wondering.
Thanks for an awesome build and Happy Holidays!
Charlie
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on November 28, 2016, 07:16:44 PM
Hi Snork7,
Sounds like you're build definitely has issues.  Properly built with a decent psu the noise floor will be at least as quite as your average Fet.  Are you using pcbs or PP?  Are you using ef800, ef12, ef14?  What vdc do you measure on the filament, and B+?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on November 30, 2016, 08:46:02 PM
Cheers Bonnie1 and thanks for responding!
Using poctop's pcbs, BV8R xfmr, EF800 tube, H+= 5.1V,  B+= 106.2V
Going around the tube connectors:
K= 1.097 V, 
Grid = -11.5 mV, 
5K = 1.097V,
H+=5.097V
HG= 1.4 mV
S= 0V
A=52.02V
G2=52.07
G3 = 0V

Also, it works on omni and cardioid.

Thanks!
Charlie
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on November 30, 2016, 10:02:46 PM
Okay, at the voltage divider right after R7, (but before R8, R1) do you measure approx 60vdc?  Also, connector at bottom of mic take ohms measurement of the 2 audio pins used.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on December 01, 2016, 05:09:16 PM
The downstream lead of R7 is 56.7 V (upstream is 106.2V).  Both audio wires at the connector pins are open (infinity).
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on December 01, 2016, 05:54:31 PM
The downstream lead of R7 is 56.7 V (upstream is 106.2V).  Both audio wires at the connector pins are open (infinity).

So you found issue. Check and improve all transformer connections.
You should be able to measure resistance of windings from both sides of transformer.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on December 01, 2016, 07:57:07 PM
The downstream lead of R7 is 56.7 V (upstream is 106.2V).  Both audio wires at the connector pins are open (infinity).

Hi Snork7,  Not knowing when you purchased the BV8r can you confirm if the wire color corresponds with attached data sheet?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on December 01, 2016, 11:33:10 PM
I bought them (2 of them) within the last year or so.  Yes they correspond.  Orange/white was 800 ohm while green/black was 32 ohm.  I resoldered them just in case.  Still no change.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on December 01, 2016, 11:48:34 PM
"still no change"
Are you not seeing 32ohms on the 2 audio pins?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: tonzauber on December 02, 2016, 05:41:19 AM
looking at the diagram, there is one minor design flaw, from my point of view:

if you switch to cardioid, but for whatever reason the relay does not switch in, (Bad solder joint, loose contact, failure of relais), you will have 100V or more on the front diaphragm which will make it collapse.....

at the moment I don't see a simple solution for that, maybe somebody has an idea?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on December 02, 2016, 06:39:51 AM
looking at the diagram, there is one minor design flaw, from my point of view:

if you switch to cardioid, but for whatever reason the relay does not switch in, (Bad solder joint, loose contact, failure of relais), you will have 100V or more on the front diaphragm which will make it collapse.....

at the moment I don't see a simple solution for that, maybe somebody has an idea?

Why not power up lower voltage coil from Heater voltage?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on December 02, 2016, 09:08:01 PM
Hey Bonnie1
I get 31.1 ohms on the audio pins at the connector at the bottom of the mic.  Yesterday I swapped the xmfr leads and that made it worse, so I swapped them back and the xfmr is definitely wired correctly.
Thanks so much for your patience!
Listening to Kings College Choir to get in the spirit!
Cheers to all,
Charlie
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on December 05, 2016, 10:12:59 AM
Hi In76d
Sorry, but I just realized the meaning of your post regarding the audio impedance.  Actually, I measured them individually to ground and that was incorrect.  I appreciate your help.
Thanks,
Charlie
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on December 06, 2016, 09:55:13 AM
Hi Snork7,
Have you sorted the issues with your build yet?  To re-cap what we know so far.... it appears your voltages are correct, the transformer is wired correct. How about the capsule, have you verified it's a properly working capsule and connections to the capsule are correct and secure?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on December 07, 2016, 05:20:17 AM
Hi all,
I will start this build...is there any errata to know, some update ?..What are the common mistakes ?
Thank you very much
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: snork7 on December 07, 2016, 10:37:15 AM
Bonnie1
Thanks.  There is one more thing I will try and then I'll swap the capsule since I have two of them. 
Cheers,
Charlie
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Lordward on December 16, 2016, 02:59:56 PM
Hi guys, a quick question:

I'm in the middle of this microphone build and I had ordered parts from all over the world.  After waiting 4 weeks for a set of 10x1uF 250V PIO capacitors they finally arrived.  However they were only 160V, not 250V. 

My question is - how dramatic of a difference would it make to use the 160V instead of the 250V? Could it be damaging or just pointless?
Eventually the right ones will arrive but I'm not in the mood to wait another month.

Cheers,
DW
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on December 16, 2016, 05:20:59 PM
Your max voltage should be max around 110V if you build it properly so you shouldn't worry about 160V rated caps.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Lordward on December 17, 2016, 07:06:18 AM
Your max voltage should be max around 110V if you build it properly so you shouldn't worry about 160V rated caps.

Cheers, great!  Then I can at least put the thing together until the final ones arrive.
Thanks again!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Lordward on December 20, 2016, 11:33:50 AM
see attached pic. the T47 spec sheet shows the pins labelled A,B,C,and D. As does the PCB, but it is a bit confusing which pins are which on the transfomer itself. Pin A is the one closest to the 'T' in T47 on the pins side of the transformer.
Hope this helps!

Hi, I'm confused :) At Tab-Funkenwork the spec sheet shows as your picture (ABCD) and on my box it shows everything to be mirror imaged  :-\
Can anyone enlighten me??

(EDIT) I took away the pic because it wasn't showing up right.  Anyway, I got confirmation from TAB that it is as on my packaging picture which is odd because  it's the opposite of how it would fit in the PCB.  My PCB does not have pin holes for the T47 so I have to wire it anyway.  I hope this goes well  :-\
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on December 22, 2016, 09:46:18 AM
Hi, i received the mouser cart, but the 14k resistor of psu is 1/2w, instead of 1w writed on the pcb...is it still safe to use it , or should i order one 14k 1w ?
Regards,
Hugo
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on December 22, 2016, 01:04:41 PM
can you supply a picture please
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on December 23, 2016, 05:09:59 PM
Hi, i received the mouser cart, but the 14k resistor of psu is 1/2w, instead of 1w writed on the pcb...is it still safe to use it , or should i order one 14k 1w ?
Regards,
Hugo
up...if somebody can tell me if 1/2w is enough...it is not for the price of one resistor, just because i would like to have the cleanest board possible...
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: poctop on December 23, 2016, 06:27:08 PM
up...if somebody can tell me if 1/2w is enough...it is not for the price of one resistor, just because i would like to have the cleanest board possible...

Yes 1/2 W will be fine ,
Best,
Dan,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Lordward on January 20, 2017, 04:23:14 PM
I finally finished mine today!  AMI T47 transformer, Telefunken EF800 tube, Peluso P-K47 capsule.... Sounds huge and so quiet!  Impressive to say the least. 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Mjwever on January 23, 2017, 10:15:36 PM
I'm currently building the d-ef47 circuit & just checking if there's any paperwork showing the wiring/pin out for the 7 pin connector & where the pins connect to the circuit board?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Mjwever on January 25, 2017, 04:50:35 AM
So I found Oliver's schematic which shows the pin out as:
Pin 1 audio
Pin 2 audio
Pin 3 B+
Pin 4 ground
Pin 5 0v
Pin 6 H+
Pin 7 pattern switch

Does this look correct? Which of pins 1 & 2 are + or -? What does pin 5 connect to?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on January 25, 2017, 10:07:23 PM
So I found Oliver's schematic which shows the pin out as:
Pin 1 audio
Pin 2 audio
Pin 3 B+
Pin 4 ground
Pin 5 0v
Pin 6 H+
Pin 7 pattern switch

Does this look correct? Which of pins 1 & 2 are + or -? What does pin 5 connect to?

See post #78 in this thread for a diagram (page 4).

C
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Mjwever on January 25, 2017, 10:50:33 PM
Thanks for that. I had read through the thread before but couldn't see any of the pic's/diagrams. I just switched browser & now i can see what you are referring to. One more question - does pin 3 connect to the same ground as marked on the circuit board as pin 7?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Spencerleehorton on January 26, 2017, 02:35:34 AM
I've just spoken to supplier and can do the U47 transformer 5887 pcb version or with leads for £70 + p&p, if there was a group buy of above 30-40 this price could be £50 + p&p each, just thought I'd let you all know.

Regards

Spence.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on April 07, 2017, 01:07:27 PM
Does C2 and C3 need to be the same type, or just the specs are important ?
thank you
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: U87610 on April 10, 2017, 01:45:33 PM
Hey Everyone!

Excited to have finished this build!  I am really impressed with this U-47 circuit and love how it sounds on vocals with the combination of Dan's D7 capsule and the BV08C transformer.  It has a high end sparkle without an aggressive midrange presence and can handle dynamics without the harshness that I get with my U87AI. Dan's D7 capsule sounds absolutely incredible!  I have plans in the future (when more funds are available) to build this circuit again with a Thiersch blueline, but it will be for comparison sake and to have a slightly different flavor, but in my opinion, the D7 is lacking nothing and is the perfect solution for my needs for tracking vocals.  Could not be happier with this circuit.

Thanks to Dan and Oliver for making this possible for us!!!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: la-2a on April 10, 2017, 07:57:02 PM
Hi, just finished my D-EF47 build …..but I have an problem. I need a lot of  gain 40-50db and I have loud microphonic effects. The signal is very noisy, very sensitive when knocking slightly on the body. I swapped the tubes, the Capsule, the Transformer. I double checked the Voltages (seems to be inside the tolerances…. poctob Mic schematics ),  measured the cable connection from Mic output until the XLR  checked the Groundings…….    seemed to be similar to snork7 problem but unfortunately  it was not the cable…   any suggestions .??? Thanks in advance
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on April 11, 2017, 10:03:46 AM
Hi, just finished my D-EF47 build …..but I have an problem. I need a lot of  gain 40-50db and I have loud microphonic effects. The signal is very noisy, very sensitive when knocking slightly on the body. I swapped the tubes, the Capsule, the Transformer. I double checked the Voltages (seems to be inside the tolerances…. poctob Mic schematics ),  measured the cable connection from Mic output until the XLR  checked the Groundings…….    seemed to be similar to snork7 problem but unfortunately  it was not the cable…   any suggestions .??? Thanks in advance

Check the tube and the 10nf styro cap
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: la-2a on April 11, 2017, 11:50:48 AM
@ TLRT ...OMG.!!!Problem solved.  Changed the 10nF Cap and all is fine now    :)    YES I LOVE THIS FORUM.!!
Thank you man ….you saved my day ..

best regards
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: U87610 on April 11, 2017, 01:01:17 PM
Wanted to attach some sound files of my D-EF47 with Dan's D7 capsule to show off how awesome this mic is on vocals.  I chose the star-spangled banner since there is a wide dynamic range and because it is open source.  Bear in mind I am much much more of an engineer than a singer, so I apologize for the rough vocal performance, though I think you can get an idea of how the mic stacks up against another awesome mic (U87AI).  I've always found the U87 to be a bit harsh (but not unusable) on male vocalists who have any grit or air/breathiness in their voice.  With the U47, that problem is gone!

I do not own pairs of any nice pres, only singles, so I unfortunately had to use two of my  003's pres, but I think it highlights the differences pretty well.  The files were recorded in my home studio, which is semi treated.  Mic setup is what is seen in the picture.
There is no EQ, compression and I did my best to make the volumes equivalent. I apologize for the "p" sounds on the U47 -that is not the mic, it's because the pop filter I have is too small to cover both. 

https://www.dropbox.com/sh/tvlfqfnavpk57md/AABewubfOTYY0fl5QkyQ1kLEa?dl=0
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on April 12, 2017, 02:24:50 PM
Hi,
I have 260v on the 220v terminals...how could i make this lower (if possible ?), or is it an issue in this circuitry ?
Thank you
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: U87610 on April 12, 2017, 03:34:24 PM
Hey Hugo!

If you have ~270 AC at your toroidal before the PCB, then I think you are okay.  Wimmy and I both had that at our toroidals before we ran it through the rest of the circuit and everything checked out fine at calibration time.  I have not checked the terminals with it in the circuit, but was able to get H+ at 5.05V DC and B+ at 105V DC during calibration.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on April 14, 2017, 05:06:56 PM
Hi all,
Would it be an improvement to put PIOs 1uf caps ?
Regards,
Hugo
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on April 14, 2017, 11:43:05 PM
Yes, for some ears. A lot of people prefer them but there's no guarantee that you will. If you find some on ebay, buy them. Build your mic with Polypropylene film caps. Once you have your mic tweaked the way you like it, swap the output caps and see what you prefer.

A lot of people like metallized paper in mics as well.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on April 15, 2017, 06:50:57 AM
Yes, for some ears. A lot of people prefer them but there's no guarantee that you will. If you find some on ebay, buy them. Build your mic with Polypropylene film caps. Once you have your mic tweaked the way you like it, swap the output caps and see what you prefer.

A lot of people like metallized paper in mics as well.

Thanks ! I took a pair of vintage green russian PIOs, will compare and will post my results here.
Regards,
H.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: useme2305 on May 22, 2017, 06:37:38 PM
hello everyone!

i just measured my heater voltage with the EF800 connected and it's a bit high at 5.8V with the 50 ohms trimmer already at maximum i can't get it any lower without any modification. what would you guys suggest to lower the voltage?

EDIT:

i replaced R4 (680R) with a 470R and it's all good now. also, i chose a 5W resistor instead of 2W for the 470R one in this place just to be sure.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Rixsta on May 23, 2017, 08:43:34 AM
Just wondering if anyone can let me know in PM or here what kind of price it cost them for the build of this microphone ?
Thanks
Riki
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: useme2305 on May 23, 2017, 10:01:27 AM
for me approximately 1300 EUR. with Thiersch capsule and BV08r transformer from AMI and an Equinox body i had laying around.

it can be done for  slightly under 1000 EUR if you don't use premium capsule/transformer/body.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Rixsta on May 24, 2017, 05:41:41 AM
Thanks for that :)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ShaneSBG on June 20, 2017, 01:24:27 PM
see attached pic. the T47 spec sheet shows the pins labelled A,B,C,and D. As does the PCB, but it is a bit confusing which pins are which on the transfomer itself. Pin A is the one closest to the 'T' in T47 on the pins side of the transformer.
Hope this helps!

Hello Friends and Neighbors...I realize I am a year and a half late to this part of the conversation, but I am running into a similar situation as another person here. It would appear their solution was to wire in the T47 rather than use the pins as some others have. Hopefully Jackinthebox will see this or anyone else who has used the T47 from AMI.  In this post the quote is discussing  the orientation of the pins (A-B, C-D) The information regarding the orientation of the pins (A-B, C-D) is not the way I was told it is from AMI on this transformer. I attached the picture I was sent from AMI showing which pin is which. This picture appears to be reversed from the information given from "jackinthebox". I initially thought AMI had marked the picture incorrectly for me because all the transformers in the images from "vintagemicrophonepcbkit.com" have the transformer attaching/mounting onto the capacitor side of the PCB not the tube side. I went ahead and soldered the transformer on the board on the cap side and realized the body didn't fit over the transformer the way I had the L brackets connecting to the ribs of the body...so then I thought "oh, ok I get it. AMI did not label the picture wrong , the transformer simply connects on the back (tube) side of the PCB." once I did this-sure enough the body fit just fine, the letters lined up perfectly on the PCB with the picture AMI sent me and I assumed it was all good.

I finished the microphone (also, I apologize but I built a D-47 and not a DEF47, but the boards appear to be laid out the same apart from the tube configuration) so I finished the microphone, kicked it on and it worked just fine. Very, very low noise and sensitive. Nice hot signal and zero buzzes, hums or anything to imply a mistake. The confusion is the orientation of the letters as they correspond to the PCB. I looked closely at the board and as far as I can see the letters are exactly what they should be...the A pin runs to P+, the B pin runs to P- etc so I know the lettering on the PCB is where it should be its simply a matter of which pin is which on the transformer.

My question is how did you come to the conclusion that "Pin A is the one closest to the 'T' in T47 on the pins side of the transformer" as the information I received from AMI indicates that pin is "B", and it would seem after looking at your photo and your post I did it wrong.  I'm new to this, this is my first build. but I'm not new to electricity. DC typically doesn't work backwards, AC does, but not DC. Again, I am new here so my logic could not matter at all. I honestly just want to do it correctly. I don't want to power on the microphone until I confirm the orientation of the transformer pins. I am so sorry for the long rant I feel like I need to explain myself to make sure people understand my question. Also to be clear as well...this is NOT a mic and mod kit! I purchased this board set from vintagemicrophonepcbkit.com  and my body came from sudio939. So anyway, thanks everyone. If anyone has any insight into this I would really appreciate it. I am not trying to be arrogant or rude or anything like that. I am genuinely grateful for everyone here always helping each other and hopefully can help me too  :)

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ShaneSBG on June 20, 2017, 11:32:17 PM
This is what AMI told me today in an email which explains the orientation of the letters and why it works in both locations, the front capacitor side and the back tube side
"Hi Shane,
The T47 is a bi-directional transformer.
ie, if A is connected to capacitor, then D is xlr pin 2
It is also true if B is connected to capacitor, then C is xlr pin 2
A & B are primary
C & D are secondary
center pins need to be linked for each perspective pri/sec side.
Hopefully this clears up any confusion you have."
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bernbrue on June 24, 2017, 08:23:12 AM
Hi,
We've  finally built a pair of these nice mics. From the first listening they sound really great (Thiersch M7 capsule with U47 body)., but there is still something not right. With both mics I get quite audible hum, which gets significantly quieter when connecting the mic body to audio ground and completely disappears when switching off the PSU. We've used a stock Chinese psu with B+ reduced to 105V and heater to 5,5 V.
Any ideas?
Bernd
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: useme2305 on June 24, 2017, 09:41:50 AM
EDIT: just saw that you used a stock PSU

i had a hard time positioning the 20V transformer without getting any hum. in the end i had to install it vertically with an L-steel profile as far as possible from the mains input. i even had to rotate it in millimeter increments with headphones on listening carefully until i got the least hum before i drilled.

but still, if you can you reposition the tranny in the stock psu in any way i'd try that first.

i'd also use nice shielded cable for off-board wiring of XLR out 2&3 from XLR to XLR inside the psu.

you  can try to rotate you mains socket 180 degrees and see if that helps. it did for me combined with the aforementioned steps.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bernbrue on June 24, 2017, 09:59:43 AM
Well, I think it's more a grounding issue. I checked all connections and all relevant connections  to ground are there. So I do not understand, that hum is reduced when I make another connection from the mics body to audio ground, although this connection is already there (through the cable from psu to mic)
Bernd
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ShaneSBG on June 24, 2017, 01:21:52 PM
Well, I think it's more a grounding issue. I checked all connections and all relevant connections  to ground are there. So I do not understand, that hum is reduced when I make another connection from the mics body to audio ground, although this connection is already there (through the cable from psu to mic)
Bernd

Did you make your own cable or use a premade? I ask because I made my own cable for  a D-47 and didn't connect the shield of the mic cable to the tabs on both sides of my connector. I connected the shield to the ground pin in the cable, but not to the the ( I am assuming its the ground tab of the connector, in my case I used 7 pin XLR on both sides) tab. I initially had a hum and once I did that it was gone. I may be way off, but I just thought I would share what happened to me. My ground hum sounds like it was very close to yours. I also built my PSU, so I grounded that as instructed for the build, but it was my cable shield not being connected properly.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ShaneSBG on June 25, 2017, 12:57:21 PM
Hi,
We've  finally built a pair of these nice mics. From the first listening they sound really great (Thiersch M7 capsule with U47 body)., but there is still something not right. With both mics I get quite audible hum, which gets significantly quieter when connecting the mic body to audio ground and completely disappears when switching off the PSU. We've used a stock Chinese psu with B+ reduced to 105V and heater to 5,5 V.
Any ideas?
Bernd

I curious what the outcome is with this issue...any feedback?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bernbrue on June 25, 2017, 02:37:41 PM
Hi,
thanks a lot for your help. I had the selfmade cable with the mic on the bench today and had no success in fixing it. There is still hum which disappears when I make an external connection between the audio xlr of the psu to the mic body. I checked all connections with the multimeter and I think my grounding and wiring is correct.  I'll report here when I find a solution.
Bernd
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ShaneSBG on June 25, 2017, 03:15:58 PM
Hi,
thanks a lot for your help. I had the selfmade cable with the mic on the bench today and had no success in fixing it. There is still hum which disappears when I make an external connection between the audio xlr of the psu to the mic body. I checked all connections with the multimeter and I think my grounding and wiring is correct.  I'll report here when I find a solution.
Bernd

I apologize for asking the same question, but I didn't understand if you did connect the shield of the cable to the ground pin as well as the ground tab of the connectors on both ends? I was able to get continuity with each pin of my cable as well, but because I did not solder the shield of the cable to both the pin ground and the tab of the connector I had a hum...I had actually read about that exact issue with someone else on this site and another site. Again it was a different microphone he and I built, but I think this particular aspect is the same...I could be wrong though

Did you happen to try a premade cable? That is what confirmed for me I had an issue with my cable. No hum with premade...yes hum with memade  8)

I'm sure you know, but I can add a picture if you like. Sometimes a picture describes something much better than I do  ;)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Murdock on October 02, 2017, 07:42:22 AM
Hey,

I maybe want to use the relay switching system in my M49 build. But don't really know how to chose the right resistor values.
I don't exactly understand R9 in the EF47 PSU schematic. R5 is the dropping resistor to drop the 105V to about 52V for the relay operation, right?
What is R9 for? When the pattern switch is in Cardioid mode, the relay voltage goes via the R9 resistor to ground. When the switch is in Omni mode, the relay voltage goes to the relay and closes it. So R9 is not in the circuit in Omni.
Am I right so far?
But why does one have to change R9 when choosing between a 24V or 48V relay?
Sorry when this is trivial, but I'm a bit confused.

Edit: Am I right, that R5 should be around 18k for 116V B+?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jrasia on October 20, 2017, 01:39:12 PM
So what would be good dummy loads to test the psu with?

Do I also need a load on the relay?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on October 20, 2017, 03:00:08 PM
So what would be good dummy loads to test the psu with?

Do I also need a load on the relay?

It was mentioned earlier I think, 150k for anode, 12k for the relay, 30ohm for the heater will be approx ok.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jrasia on October 23, 2017, 05:10:34 PM
It was mentioned earlier I think, 150k for anode, 12k for the relay, 30ohm for the heater will be approx ok.

Thanks TLRT!

So 30ohm from pins 3-4
150k from pins 5-7

but where should i put the 12k relay load.  pin 6 to ?

i'm such a noob:)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on October 23, 2017, 05:24:41 PM
Thanks TLRT!

So 30ohm from pins 3-4
150k from pins 5-7

but where should i put the 12k relay load.  pin 6 to ?

i'm such a noob:)

Put the 12k between pins 6-7!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jrasia on October 28, 2017, 01:40:27 PM
Great.  Its up and running.  Last bug to iron out is that polarity seems reserved on output.  Things sound a little 'hallow' in omni mode as well but I'm not familiar with what is should sound like.  Wiring is correct point to point.

Using Dany's D7 capsule AMI BV08C transformer.

Is it best to just reverse the XLR ouput pins 2 and 3, or is there something going on with the capsule or transformer.? Does it make a difference where polarity is reversed?  Ie is the amplifier behaving differently if the transformer is wired backwards?

Thanks!

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TLRT on October 30, 2017, 08:55:47 AM
Great.  Its up and running.  Last bug to iron out is that polarity seems reserved on output.  Things sound a little 'hallow' in omni mode as well but I'm not familiar with what is should sound like.  Wiring is correct point to point.

Using Dany's D7 capsule AMI BV08C transformer.

Is it best to just reverse the XLR ouput pins 2 and 3, or is there something going on with the capsule or transformer.? Does it make a difference where polarity is reversed?  Ie is the amplifier behaving differently if the transformer is wired backwards?

Thanks!

NO matter where you exchange the cables, the easiest is to reverse at the PSU terminals, don't need any solder job
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jrasia on November 01, 2017, 10:03:42 AM
Fair enough.  I was definitely going to make the change inside the PSU.
So there's no difference if I reverse the xlr output vs the audio 'input'side?

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jumpstart on November 03, 2017, 08:35:51 PM
Hi All,
I am just completing my first OA build. H+ is fine at 5.1V.  However, B+ coming out of the power supply is 193V, plate voltage at the EF800 is 62V. I am one of the ones who got a Triad power transformer that had a secondary voltage of 268VAC.  Do I just up the values of R1 and R3 in the power supply (now 20K)? R8 is set to minimum. What should be the plate voltage be at the tube under normal operation?
I am taking these measurements without the capsule or transformer in the circuit, but it doesn't seem to me that would make a difference in voltage. Any help would be appreciated.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: HarmonyUnited on November 06, 2017, 08:44:43 PM
Hey All,

Just completing the PSU build for the D-EF u47 here. I put dummy loads in the built psu (150k for B+ and 12R for H- ) and read about 220v at b+ and 5v at H-... So it seems that the heater supply is good... but I am concerned with the B+ voltage supply.

Here is how the wiring of the Mains toroidal transformer is setup:

Tied the red and orange.
Tied Grey and brown wired to Neutral Mains power on IEC.
Tied Blue and Purple and wired to switch, switch tied to HOT on IEC.
Black and yellow are going to the PCB.

Using a meter between the black and yellow wires I read 268vac. Reading between black and 0v is 130vac, yellow and 0v is 130vac as well.

 I also took some readings at the diodes... From the top of the pcb down: at D8 on the non-white strip side ( towards mains) read 144vdc and the white strip side  is 345vdc. D6  144vdc (mains side) 0vdc (white strip side), D9 is the same readings as d8 and D7 is the same as D6. I remember when purchasing the diodes from mouser that the ones in the BOM were obsolete. I think i choose the same equivalent (https://www.mouser.com/search/ProductDetail.aspx?r=625-1N4007GP-E3%2f73). The original obsolete part was:  (https://www.mouser.com/Search/ProductDetail.aspx?R=1N4007virtualkey51210000virtualkey512-1N4007)

I took measurements at r1, r3, r5, and r7.  R1 Left side 305vdc Right side 250v,  R3 Left side 305vdc,  Right side 370vdc, R5 left side 210vdc, right side 0v. R7: left and right sides 211v.

It also started to smelll a bit like melting plastic so I shut off the PSU...

Im not sure if this is normal but i do not want to plug my microphone circuit into this as it stands with these current readings. I dont think that the mic will bring the voltage down 100volts. Any ideas friends?

Thanks so much! :)

-Eric

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: granger.frederic on November 09, 2017, 03:24:09 AM
it looks like your transformer can handle more current than the original one, or has a higher secondary AC, thus the ht is increased...
you have to  increase  the resistors in the HT rail (be careful to their dissipating power)
you can put two zeners (60v thus 120V) 3w and the end of the rail to protect the mic capsule, then you adjust to 105v.
at 105v the zener won't work and won't impact the noise ratio
about the H+, for me, 5V is a bit low and i would increase it to 5,8V min, to avoid long term cathode caking risk...

regards
Fred
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jumpstart on November 09, 2017, 08:41:47 PM
Hi Eric,
I was getting exactly the same readings as you. Here's what I did: I measured the voltage drops across the original 20 K resistors, figured out the current, and got in the ballpark of what I figured I would need to put in there to drop the voltage sufficiently. I ended up with R1 and R3 at 110 K . I have 105 V at the B+ output, and my mic works great. I'm not sure why these are so radically different from Dany's circuit values, but it's what I had to do to make this work. I have read that it is better to keep the supply unregulated (i.e. no zeners). I would appreciate comment from anyone else on why this may be.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: HarmonyUnited on December 13, 2017, 06:48:38 PM
Hey all,

I'm experiencing the strangest behavior in my microphone. All of the voltages are perfect and the mic sounds great.... as long as it's plugged directly into my apollo or apogee audio interface. As soon as I try to use any outboard preamps there is buzz and low audio levels even with a cranked pre gain and Little low end too. It doesn't matter which pre I choose in my system.  To be sure it wasn't just the mic pre, I used a different tube mic in the same input of my snake and it sounded perfect... plug in the 47 and no good. 

It just boggles me because when I plug it directly to my apollo it sounds AMAZING! Loud levels and no noise or buzz.

Anyone have any ideas?

I have the 3 pin xlr pin 1 (ground pin) tied to the xlr connector housing, the chassis and pin 1 of the pcb xlr section. Pin 2 and 3 are tied directly to the multi pin audio hot and cold.

Multi pin connector center pin is ground and goes to the pin 7 on the pcb.

Any ideas would  be very appreciated.

CHEERS! :)

Eric

UPDATE EDIT: Sooooo, its embarassing but apparently this is the behavior of a microphone with two of the transformer leads swapped on the mic PCB.  So the Capacitor and audio - leads of the traffo were in the right spot but ground and A+ were switched. It sounded pretty close to normal (save a bit of hum) through mic pre amps that were electronically balanced. But the transformer balanced mic pre inputs were quiet and super noisy...  Discovered this on the phone with AMI today. THANKS DENNIS!!!

If anyone out there experiences this sort of behavior: Check your transformer wiring  :o ??? :P

Mic is all wired up properly and sounds INCREDIBLE! Wow yay. Thanks for all the help along the way.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: hugo on December 18, 2017, 11:43:38 AM
yes, absolutely top notch project..compared to an authentic U87 AI...the DEF47 sounds much better on most of vocals.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Murdock on December 27, 2017, 09:20:52 AM
Hey,

I maybe want to use the relay switching system in my M49 build. But don't really know how to chose the right resistor values.
I don't exactly understand R9 in the EF47 PSU schematic. R5 is the dropping resistor to drop the 105V to about 52V for the relay operation, right?
What is R9 for? When the pattern switch is in Cardioid mode, the relay voltage goes via the R9 resistor to ground. When the switch is in Omni mode, the relay voltage goes to the relay and closes it. So R9 is not in the circuit in Omni.
Am I right so far?
But why does one have to change R9 when choosing between a 24V or 48V relay?
Sorry when this is trivial, but I'm a bit confused.

Edit: Am I right, that R5 should be around 18k for 116V B+?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jcdignan on December 29, 2017, 03:20:18 PM
Hey guys,
where can I find the complete schematics of the PSU plz (If there is no, i will make it)  and a calibration procedure

I have a problem with some resistors. Due to the change of values 3W don't fit on the pcb at the 1W and 2W places :(

Thank you for help

Regards,

J-C
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on January 01, 2018, 07:05:40 PM
Schematics for this project are in the first post as links. Here's the power supply:
https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0714e.pdf
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on January 01, 2018, 07:53:08 PM
Has anyone built this with variable pattern select, using the relay as a cardioid only select? Only issue I see is the backplate at 52.5V instead of 63v. Not sure how much effect that would have on the sound of the mic.

The U47 project linked below did the very same thing but in the end claims the mic is equal to or superior to the Neumann U47 they had on hand.  Makes me thing they were a little being a little biased after all the work they did (I do the same thing when first hearing a build).

http://www.moxtone.com/mU47_U47.html
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jpsexton on February 05, 2018, 07:48:15 AM
After a few years of this project being packed away in storage I'm finally getting back to working on it. I really hope to finish it soon. The Mic has been done for a long while but I still needed to build the PSU.

I made some progress this weekend.  :D
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 05, 2018, 11:09:01 AM
I can't say it makes a difference because I haven't tried it, but I personally wouldn't do a layout where the transformers are near the audio jacks.

I have the same Collective Cases box for my M49. I could snap a picture of the layout if you'd like. I worry that your heater transformer and choke may induce noise onto your audio path.

If you want to keep your layout the same, don't run your audio pair to the PCB. Run it directly from the 7 pin to the 3 pin. Twist a pair of wires tightly together (drill technique work but leave extra to cut off) and run them against the chassis and keep them short.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jpsexton on February 05, 2018, 12:01:08 PM
I can't say it makes a difference because I haven't tried it, but I personally wouldn't do a layout where the transformers are near the audio jacks.

I have the same Collective Cases box for my M49. I could snap a picture of the layout if you'd like. I worry that your heater transformer and choke may induce noise onto your audio path.


That would be great to see your layout. I'm not attached to this layout at all. My only thought process was trying to fit it all in there.  ;D
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 05, 2018, 12:19:07 PM
It'll have have to wait until this evening but for now check out Dany's PSU layout at the beginning of the thread or this one from his M49 build:

(https://io.groupdiy.com/file/gdiy-2017/u/39511/58d1402a0582e.jpg)

To cram it all in there has to be some overlap. Dany placed his board low to the chassis and the XLR connections protrude above the board and the pot is sticking above as well. For mine I used double standoffs to raise the board above the XLRs and heater pot.

The main idea is to have the transformers mounted by the IEC inlet (square hole). It's also nice to have the lamp there as well but if you have to have it near the audio twist your pair tightly and run against the chassis like heater wiring in an amp.

I also recommend not terminating the 0V on the PCB to the chassis. Your IEC groung must be terminated, the 0v must be bonded to the shield inside the mic and the shield must be bonded to the chassis inside the PSU. You can then run the pin 3 of 7 connection from the PCB to a switch which opens and closes the PCB ground connection.

See the following post for details:
https://groupdiy.com/index.php?topic=50021.msg796487#msg796487 (https://groupdiy.com/index.php?topic=50021.msg796487#msg796487)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jumpstart on February 05, 2018, 05:26:07 PM
Hello all,
After building my U47, I found that the capsule was not centered in the headbasket grille, rather it was offset towards the top of the headbasket. Is this right, or should it be centered? Will this affect the sound at all? I purchased the microphone body from Studio 939 (the Alctron MK47)
I have included a photo.
Thanks

PS The mic sounds amazing



Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 05, 2018, 06:35:16 PM
One shot of my M49 PSU layout
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 05, 2018, 06:36:08 PM
Another angle
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: useme2305 on February 05, 2018, 06:45:53 PM
Hello all,
After building my U47, I found that the capsule was not centered in the headbasket grille, rather it was offset towards the top of the headbasket. Is this right, or should it be centered? Will this affect the sound at all? I purchased the microphone body from Studio 939 (the Alctron MK47)
I have included a photo.
Thanks

PS The mic sounds amazing

it's correct that way if you want it to be more like a vintage u47. up top that is.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: jpsexton on February 05, 2018, 10:16:57 PM
Thank you for the PSU layout pics. I really like the elevated PCB.

What you say makes allot of sense and is very logical when you think about it.

I'm taking it apart now to do a new layout.

Thanks again.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: uffetuff on February 06, 2018, 08:26:26 AM
Hi!

I've read through the thread but I didn't find exactly the problem I have. I actually took over this projekt from a friend, so it was finished when I got it but it didn't sound right. So I checked through the psu to make sure that the B+ and H+ values were correct.

Now to the stupid question. Should the mic be connected when doing the measuring? Without the mic connected the H+ run at 26v and nothing is happening when turning the pot.

I've also changed the tube in the mic, to see if that was the problem, but now I'm afraid to plug it in if the voltages are not correct. Don't want to damage it.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 06, 2018, 01:10:44 PM
The power supply needs a load to be adjusted and measured. Best option is to make a dummy load to get close then plug in your mic and adjust closer.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: uffetuff on February 07, 2018, 06:50:46 AM
The power supply needs a load to be adjusted and measured. Best option is to make a dummy load to get close then plug in your mic and adjust closer.

Ok, so i searched through the thread again and i f I got it right that means adding a resistor between B+ and 0v, and H+ and 0v?
I also found someone recommending 150ohm for the B+ and someone calculates 12ohm 2w for the H+. Can I use those values or do I need to calculate my own?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 07, 2018, 01:52:57 PM
150 is way to big of a load (lower resistance=bigger load), they probably meant 150k (150,000).

105V with a load of 150k gives you a draw of 0.7mA. Dany's schematic shows a current draw somewhere around 0.5mA which would give you a load of 210k (210,000). Use anything between 150k and 210k. You don't have to be precise, you'll be readjusting once your mic is connected. This helps to make sure your power supply doesn't have any major issues without damaging your mic. You may even have trouble hitting 105V on the button if you select the wrong value resistor but then get it when you connect your mic. If your voltage is way out (something like 50V or 150V) don't connect your mic.

For the heater supply, your draw will be around 275mA plus 30mA for your relay. At 6.3V your load would be 20.5ohms. At 5.2V your load would be around 17ohms. i burn in my tubes at their rated value (6.3) then adjust afterward to a more mic friendly voltage.

While the value of your heater dummy load isn't critical the power rating is. The power is around 2W so use a 2W resistor and don't keep it powered long. Use a 5W if you want to keep in on there a while.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Olegarich on February 10, 2018, 03:56:30 PM
Hi Diy family, I did cehck schematics but i can't find what power transformes exactly needed for this project??

What priamries and secondories should be and how much VA??

Thanks
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TillM on February 10, 2018, 07:41:50 PM
the BOM tells this one.
https://www.mouser.de/ProductDetail/553-VPT230-110

25VA
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Olegarich on February 11, 2018, 04:11:04 AM
Still i can't understand a bit with those transformers. I'm in europe so my primary should be 220V

Bom says there is 3 power transformers, why 3?


Power Transformers DualPrimary 115/230V 12VA, 20V CT @0.6A

Power Transformers Single Primary 115V 12VA, 20V CT @0.6A

Power Transformers Toroidal Mount/25VA 115/230Vo Secondary

Can someone explain which  goes where?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: wlinart on February 11, 2018, 04:41:51 PM
Still i can't understand a bit with those transformers. I'm in europe so my primary should be 220V

Bom says there is 3 power transformers, why 3?


Power Transformers DualPrimary 115/230V 12VA, 20V CT @0.6A

Power Transformers Single Primary 115V 12VA, 20V CT @0.6A

Power Transformers Toroidal Mount/25VA 115/230Vo Secondary

Can someone explain which  goes where?


Looks like the first transformer (Power Transformers DualPrimary 115/230V 12VA, 20V CT @0.6A) is for 220V countries
the second one for (Power Transformers Single Primary 115V 12VA, 20V CT @0.6A) 110V countries.
Those are the ones for the heater voltage.
Just choose the one you need based on the voltage in your country. (So you, Olegarich, would need the first one)

The third one is the one used for the B+ voltage. (thanks to the 115V/230V secondaries). You need one of those as well.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TillM on February 11, 2018, 06:12:32 PM
as Wlinart already said, you need two.
You said that you are in a 220v Country.
So you need this two.

https://www.mouser.de/ProductDetail/553-VPT230-110

and

https://www.mouser.de/ProductDetail/546-186C20
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Olegarich on February 13, 2018, 01:48:01 AM
Allrighty, so now it's clear, thank you guys!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Olegarich on February 18, 2018, 03:29:05 AM
Hi guys! I'm waiting for the last parts to start building mic. Can't wait
I've read this thread couple times and I found that some people having buzz issue, when microphone is in cardioid mode.

Glacier wrote a nice post how to solve that problem. Basic idea:

The goal here is to send ~48v to the mic on the "PAT" wire when the switch is in the Omni position, while sending a solid 0v when the switch is in the Cardioid position.


By saying "Solid 0v" does it means ground?  Do I understood it correctly, that when switch turned to cardioid mode you want that omni connection would be connected to the ground instead of floating free?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Olegarich on February 20, 2018, 04:23:13 PM
can anyone confirm if I'm on the right track?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Delta Sigma on February 20, 2018, 11:24:21 PM
Ignore the work "solid". 0V in this case is referenced to ground. It is the common return for the heater, B+ and bias supplies.

The relay, when energized, closes the contact that provides the Omni pattern. When de-energized, the contact opens creating a cardioid pattern.  To energize the relay, voltage is placed across the coil. If that voltage is removed the relay and floating leads can cause noise. Short the relay supply voltage to ground (as shown in Dany's schematic) when the relay is de-energized (cardioid).

Other sources of a "buzz" (100Hz in Europe, 120Hz in N.A.) are ground loops and under rated heater transformer.

See this for grounding:
https://groupdiy.com/index.php?topic=50021.msg796487#msg796487 (https://groupdiy.com/index.php?topic=50021.msg796487#msg796487)
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Olegarich on February 21, 2018, 05:41:06 AM
Thanks man for the answer!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: r2d2 on March 03, 2018, 06:01:18 AM
HI  , any sound sample like acoustic guitar ,voice,etc..  recorded with a flat preamp (as well) ?
And also some sound comparison with the original mic (as well 2) ,
with links to sound samples in page 1.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bakahed on March 10, 2018, 06:55:45 PM
Hey,
I don't have the right resistor to adjust the H+ voltage so I cranked the pot all the way up and plugged in the mic.
The voltage was at 2 when it first powered up but kept rising up to 9v after 30 minutes of use. Turning the dial counterclockwise only increased the voltage so I didn't move it.
The pot gets so hot that I cannot keep my fingers on it after a while.
Is it safe to have the tube running at 9v? It didn't affect the sound or anything at all. The microphone has a very nice frequency response and there's barely any audible buzz.
What could be the reason for increased H+ voltage?
Thanks,

baka
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Murdock on March 11, 2018, 04:21:53 AM
No, 9v is way to high. About 6.3v is normally used but olli (rip) underheated the tube in his design (about 5,2v). This should increase heater life and reduce noise. The original vf14 was also underheated.
What pot/resistor do you use?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bakahed on March 12, 2018, 12:09:59 AM
No, 9v is way to high. About 6.3v is normally used but olli (rip) underheated the tube in his design (about 5,2v). This should increase heater life and reduce noise. The original vf14 was also underheated.
What pot/resistor do you use?
Never mind, I figured it out. I had the multi meter on AC.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: [email protected] on March 17, 2018, 01:36:57 PM
Hi All,

I'm somewhat stuck. I'm wondering if there is anyone (preferably in the states) who has successfully completed Dany's D-EF47 build with PSU, who would also be interested in finishing what I can not?

I got into this (these) builds with a more experienced tech who had planned to build a pair. He decided to go a different route and I am left at a stand still.

I actually delivered the pair of mics I have to a tech shop in Chicago  towards the end of 2016 and requested they try to finish them while I had been moving and had no access to my little work bench.

After all this time, I just picked them up unfinished and am not sure how to proceed. At this point, Id just like to have finished working mics and am Im willing to hire someone to finish these.

I can send any info and pics needed to get a sense of the status of these mics. Most of the Im local to the Chicagoland area. Referrals are welcome!

Most of what is left is:

-wiring the second mics Transformer to PCB and output conector
-wiring the Dany PSU (double check PCB)
-wiring the appropriate pin configuration for the Tab PSU
-wiring the mic cable for the Tab PSU
-mounting capsules
-testing

One mic is the following:
Theirsch M7 blue and capsule mount (not mounted)
Tab BV08 classic
EF800
Dany PCB (assembled)
Dany PSU build (assembled, but not wired)
Aputis Body
9 conductor Gotham cable

Other mic is:
Theirsch M7 Blue and capsule mount (not mounted)
Tab BV08 classic
Tab - EF800
Dany mic PCB (assembled)
Tab - PSU (built but not wired to mic input)
9 conductor Gotham cable
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dmp on March 27, 2018, 12:39:53 PM
Is this how to the pattern switch?

Sorry if I missed it but I don't see this anywhere in the docs on the first post.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: iturnknobs on March 30, 2018, 11:09:25 AM
DMP-

I'm having similar questions/issues. My back capsule is not heating up when switched to omni.  Your drawing appears to make sense and I have come up with a similar idea.  How/where do you propose connecting "crd" and "com" together? Maybe here at the switch? My switch appears to have a common center lug and selects either position 1 or 2.  I believe my drawing matches your schematic of the switch connection. This should satisfy the ground for the relay when in cardioid and energizes the relay to make contact for backplate voltage in the omni position.

-Brian
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: iturnknobs on April 01, 2018, 09:28:05 AM
DMP-

Your drawing/this wiring works for pattern switching. I have tested it. My only complaint would be the "pop" when switching between patterns. Anyone know if a(and what value) capacitor might reduce this problem. I'm guessing it would go in between the "CRD" and "COM"(tied together) and switch lug. Any ideas?

-Brian
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dmp on April 02, 2018, 12:22:20 PM
DMP-

I'm having similar questions/issues. My back capsule is not heating up when switched to omni.  Your drawing appears to make sense and I have come up with a similar idea.  How/where do you propose connecting "crd" and "com" together? Maybe here at the switch? My switch appears to have a common center lug and selects either position 1 or 2.  I believe my drawing matches your schematic of the switch connection. This should satisfy the ground for the relay when in cardioid and energizes the relay to make contact for backplate voltage in the omni position.

-Brian

I was going to connect them right on the power supply PCB and run a single wire to the switch.  They are forming the voltage divider to create the relay voltage so it would not make sense to run two wires. 
Your drawing looks fine.


DMP-

Your drawing/this wiring works for pattern switching. I have tested it. My only complaint would be the "pop" when switching between patterns. Anyone know if a(and what value) capacitor might reduce this problem. I'm guessing it would go in between the "CRD" and "COM"(tied together) and switch lug. Any ideas?

-Brian

Good to know. I wired it up but have not tested yet.

Unfortunately, I don't think you'll be able to get rid of the pop. The relay is switching the connection of the back to the front.  Adding a capacitor to the power supply to the relay won't make this gradual. And having a capacitor between the front and the back of the capsule will allow signal to go across, messing up the cardiod setting.
Best to just get in the habit of muting the mic while changing patterns.
Any mic that uses a switch or relay to change patterns will pop. Using a pot to switch patterns by adjusting the back polarization voltage is quiet, but is a different design than this. 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: iturnknobs on April 15, 2018, 02:30:11 PM
So...

I have assembled a mic which seems to work correctly in cardioid and omni and appears to have a low noise floor. The problem I am encountering is with the B+ voltage.  Turning the potentiometer/trimmer resistor in the psu, I can only get a maximum of 101.8 vdc.  Unloaded, the PSU shows 138vdc.  I'm guessing that swapping resistors R1 and R3 in the psu for a lower value might be the trick(any suggestions?)

Also, I have spoken with Dennis over at AMI/Tab Funkenwerk about a similar point to point build and he has told me that the B+ 105V should have always been 120vdc (not 105). Can anyone comment or clarify?

-Brian



Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Bonnie1 on April 20, 2018, 03:51:45 PM
Also, I have spoken with Dennis over at AMI/Tab Funkenwerk about a similar point to point build and he has told me that the B+ 105V should have always been 120vdc (not 105). Can anyone comment or clarify?

-Brian
[/quote]

Hello Brian,
To clarify, 60v on the backplate and 120v on rear diaphram for Fig. 8.  If your psu B+ is 105v the resistor divider setup 2M/3M, however if your psu B+ is 120v then equal value resistors.
Cheers-
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Nollman on April 21, 2018, 10:25:49 AM
I am building a modified 3-pattern switching version of this circuit and would prefer 120v B+ but currently I am working with 105v in my schematic. The difference in voltage will affect the resistors supplying the bias voltage for the EF800 as well. I am having difficulty finding the mathematical solution to this as all formulas I have come across require the amperage of the circuit which is unknown to me. I am very curious find your resolution to this issue. I am attaching my schematic as it is now (105V).
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dougch on April 22, 2018, 09:39:11 AM
Nolman, in the thread "DIY AMI U47" which is back a page, there is some discussion that may help. They talk about the Lucas CS-4 mic. The Schematic I have seen for the CS-4 shows that 120v is used. In place of the 30K resistor is a 47K. On the cathode is a 110 ohm resistor instead of the 100 ohm. The voltage divider uses two 1M instead of the 3M in the U48. The tube is not specified but is either an EF800 or EF802 I think. Funny, in photos of the CS-4 mic, there are Lucas labels on the tube hiding the tube number. Really? The schematic was a Tab-funkenwerk drawing.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Nollman on April 22, 2018, 09:44:08 PM
Dougch,  I can't open the link to the Lucas CS-4 schematic. Can you post it here? Thanks for the help!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dougch on April 23, 2018, 12:32:02 AM
Let's see if this works. I hope it is okay to post this. It was public when I downloaded it.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Nollman on April 23, 2018, 09:19:18 AM
Thanks Dougch! That is the schematic with the values I needed. Could someone more learned than myself explain why resistors R1, R5 and R10 are 1G and how lower values would affect the behavior of the mic. It was recommended to me to use 100M in these positions.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dougch on April 24, 2018, 12:37:33 PM
Nollman. I have been reading about this for the last couple of days and I have found some info in other forums. I just googled "1G resistors on mic capsule." I found there was science, experience and opinion involved. The trend has been toward higher values over the years. Oliver sure used 1G on his circuits. In short, there are some differences in frequency response and distortion figures, but it's up to you. The U48 had 150M on the rear capsule. See also Miktek CV4:
https://groupdiy.com/index.php?topic=61684.20 (https://groupdiy.com/index.php?topic=61684.20)






Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: la-2a on June 01, 2018, 11:26:40 PM
Hi Folks, i was wondering if it is possible to replace the two A408 Tubes. I have some 5654 Telefunkens  here.  In my opinion it should work......any Suggestion..
Thanks in advance....
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on June 03, 2018, 08:55:21 AM
Hi Folks, i was wondering if it is possible to replace the two A408 Tubes. I have some 5654 Telefunkens  here.  In my opinion it should work......any Suggestion..
Thanks in advance....

Perhaps you're thinking of a different U47 style mic?  This one is a single tube design (EF800, etc.).
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: la-2a on June 03, 2018, 08:58:08 AM
I dont think so. There are 2 Versions. Single Tube and dual Tube . ...
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Mjwever on September 28, 2018, 09:38:33 AM
Hey guys, mouser don’t have the 1/2w 14k ohm metal film resistor for the PSU,  until next year & im finding it difficult to source one elsewhere. Any suggestions?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: 59flame on October 05, 2018, 06:07:59 AM
finished the psu all voltages are correct with load.  How is the pattern switch to be  wired  that comes with danys  pcb kit?
seems i have it wired wrong. Anyone help with correct wiring of the pins on the switch?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Colorblind on October 05, 2018, 09:03:49 AM
finished the psu all voltages are correct with load.  How is the pattern switch to be  wired  that comes with danys  pcb kit?
seems i have it wired wrong. Anyone help with correct wiring of the pins on the switch?

I can't recall the pin numbers, but I found this pic of my PSU.   The multicoloured goes to CRD, red goes to COM, and grey goes to OM.  Hope that helps!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: 59flame on October 06, 2018, 09:18:29 AM
 Need to wire mic transformer it is a Moby bv08. Anyone know how this is wired to poctop pcb. I am sure I am overthinking this. But I for the life of me cannot be for sure I have this correct by  the schematic. Would like to just make sure from one of you experts. Thanks for any help you can offer
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: 59flame on October 10, 2018, 07:05:10 AM
finally finished this mic. sounds great with mobys  bv8 and danys capsule!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on November 08, 2018, 05:20:45 PM
Hey guys, mouser don’t have the 1/2w 14k ohm metal film resistor for the PSU,  until next year & im finding it difficult to source one elsewhere. Any suggestions?

Maybe this one could work?

https://uk.farnell.com/vishay/mrs25000c1402fct00/res-14k-1-600mw-axial-metal-film/dp/9464565

BR,
Mats
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: volker on November 08, 2018, 06:09:30 PM
https://www.mouser.de/ProductDetail/KOA-Speer/MF1-2CC1402F?qs=sGAEpiMZZMsPqMdJzcrNwutZF3%252bdQ0PQbLPVjdugnMM%3d

https://www.mouser.de/ProductDetail/Vishay-BC-Components/SFR16S0001402FR500?qs=sGAEpiMZZMsPqMdJzcrNwl5vxkMOsrq%2fhxTZZR6JM9g%3d

https://www.mouser.de/ProductDetail/Vishay-Dale/CCF6014K0FKR36?qs=sGAEpiMZZMsPqMdJzcrNwh7Mtt2oBqGj1%2fCa3nmfllk%3d

https://www.mouser.de/ProductDetail/Vishay-Dale/CMF5514K000DHR6?qs=sGAEpiMZZMsPqMdJzcrNwrWeLsWOg9zoPBS%2fiCgP6O4%3d

https://www.mouser.de/ProductDetail/Vishay-Dale/CMF5514K000BHR6?qs=sGAEpiMZZMsPqMdJzcrNwh7Mtt2oBqGjK0DP9f35gRk%3d

Learn to use the parametric search.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on November 09, 2018, 04:15:56 AM
I pulled the trigger yesterday and made an order of almost everything to complete this build. This will be soo much fun!!  At first it seemed a daunting task but after reading up and studying the schematics it actually seem pretty easy to build. It’s just a matter of not killing myself in the process  ;D Thanks Dan for providing the kits! 

Can anyone recommend a high quality microphone cable to use for this build?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Mjwever on November 16, 2018, 06:50:27 PM
Can anyone clarify the power wiring  for an Australian PSU? Do I need the 230v Toroidal at all or can I just connect direct to the PCB, bearing in mind our voltage is actually 240v?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on November 17, 2018, 11:25:58 AM
Can anyone clarify the power wiring  for an Australian PSU? Do I need the 230v Toroidal at all or can I just connect direct to the PCB, bearing in mind our voltage is actually 240v?

Well you could but for safety reasons a transformer between the circuit and mains power is a good idea. I´m actually wiring up the 230V toroidal as i´m writing this and i´m in a 230V country myself. I believe it should be connected in series on both input and output.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: rmburrow on November 19, 2018, 02:49:04 PM
A transformer isolated AC power supply is a REQUIREMENT, not an option, especially for a microphone or other low signal device.  In the old days, "AC-DC" equipment (especially radios) were built with the chassis "grounded" to one side of AC.   Many people were electrocuted on contact.  You probably read about musicians being electrocuted from guitar amplifiers, etc. that were at AC rather than ground potential. Later, the polarized line cords helped but wasn't the real solution.

Contact with 230 volts off your wall will be an uncomfortable or potentially fatal situation.  Assuming the average human has a body resistance of 150 ohms,  contact with 230 volts off your wall could allow as much as 1.5 amps to flow.  Since 100 mA can be fatal, 15 times that can be bad news.  Don't be cheap with powering your equipment.  You also need to fuse the primary of that transformer to protect against fire or injury in case a component fails.

AC line power in some ways is like a sewer.  Transients, RF, "hash" from fluorescent and other lights, digitial devices, etc.  get the "free ride" on the AC power system.  A power transformer is the first "line of defense" for keeping noise out and for safety reasons.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Hank Dussen on November 27, 2018, 03:57:56 AM
What would be the consequence of lowering C2 from 1uF to 0,47uF as in the original  U47 schematic?
Does this resolve in a higher bass roll off?
I'm asking this since I have some 0,47uF PIO caps.

And what about C3? Can this be lower as well?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: dmp on November 27, 2018, 10:09:37 AM
What would be the consequence of lowering C2 from 1uF to 0,47uF as in the original  U47 schematic?
Does this resolve in a higher bass roll off?
I'm asking this since I have some 0,47uF PIO caps.

And what about C3? Can this be lower as well?

I would try different caps and see what you like. I have done this in mic builds to pick a value. I've found it is much easier to hear the differences with the mic picking up music versus your voice.  A smaller cap might give a a better voicing for what you want out of the mic. 0.47uf is within the common range you'd want to use.
C2 interacts with the output transformer so it isn't a simple HPF but generally the larger the cap the lower the rolloff freq.
If you lower C3 too much you might have a little more noise, since C3 filters B+ in the mic
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: ln76d on November 27, 2018, 11:56:35 AM
What would be the consequence of lowering C2 from 1uF to 0,47uF as in the original  U47 schematic?
Does this resolve in a higher bass roll off?
I'm asking this since I have some 0,47uF PIO caps.

And what about C3? Can this be lower as well?

C3 - rather i would suggest to try go higher - for example 2.2uF
C2 - try - you can use the switch and two 470nF caps in parallel. Connect to switch out one from the circuit and you can hear A/B what's the difference. 
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Hank Dussen on November 28, 2018, 02:16:00 PM
Thanks, I'll try some different caps and let you know.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on December 02, 2018, 09:32:23 AM
Completed the PSU today. Everything seems fine   :) I hooked up a ~17 ohm load from H+ to GND and adjusted to 5.05V. With the switch in Cardioid I used a 150K load on B+ -> GND and adjusted to 105.5V. When set to omni I hooked up a 220 ohm resistor between PTRN and GND to simulate the reed switch. Voltage on B+ dropped to somewhere around 75V.

A question about the cable shield (Pin 3) on the mic side: Do you guys connect this to GND pad as well or tie it separately to the body? The GND pad on the mic PCB grounds the body as well.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on January 06, 2019, 12:34:12 PM
I finished the mic a couple of days ago and man this thing sounds great  8) Incredibly silent and with a huge but smooth bottom and detailed top end. I used a beesneez K7 and beesneez b-bv08. The transformer had to be mounted to the backside of the PCB with plastic spacers to fit inside the body. The body was unfortunately bought from micandmod. Expensive for it’s bad Chinese build quality. Get your stuff from this forum is my conclusion. The head grille is nice though.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Ricardus on January 16, 2019, 06:14:28 PM
This is the mic I want to build next. I've read this entire thread but didn't see a complete and concise explanation of calibrating the PSU using resistors as temporary loads. Or did I miss it?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on January 17, 2019, 04:18:27 AM
Or did I miss it?

Here is an answer From Delta Sigma, page 15:

"150 is way to big of a load (lower resistance=bigger load), they probably meant 150k (150,000).

105V with a load of 150k gives you a draw of 0.7mA. Dany's schematic shows a current draw somewhere around 0.5mA which would give you a load of 210k (210,000). Use anything between 150k and 210k. You don't have to be precise, you'll be readjusting once your mic is connected. This helps to make sure your power supply doesn't have any major issues without damaging your mic. You may even have trouble hitting 105V on the button if you select the wrong value resistor but then get it when you connect your mic. If your voltage is way out (something like 50V or 150V) don't connect your mic.

For the heater supply, your draw will be around 275mA plus 30mA for your relay. At 6.3V your load would be 20.5ohms. At 5.2V your load would be around 17ohms. i burn in my tubes at their rated value (6.3) then adjust afterward to a more mic friendly voltage.

While the value of your heater dummy load isn't critical the power rating is. The power is around 2W so use a 2W resistor and don't keep it powered long. Use a 5W if you want to keep in on there a while."
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Ricardus on January 17, 2019, 02:26:47 PM
I did see that, but it sounded like it might have been from earlier in the development of this project, with the PSU circuit possible changing, but if that's it, that's it. The thread for this mic isn't as complete as the one for the D87, which I built two of a few weeks ago. My first venture into building my own mics. More to come!

How many watts should the 150k-210k resistor be?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on January 18, 2019, 01:07:54 PM
I did see that, but it sounded like it might have been from earlier in the development of this project, with the PSU circuit possible changing, but if that's it, that's it. The thread for this mic isn't as complete as the one for the D87, which I built two of a few weeks ago. My first venture into building my own mics. More to come!

How many watts should the 150k-210k resistor be?

Worked fine for me =). P = I*U which gives you approximately 0.0007*105 = 0.0735W.  A standard 0.25w resistor works fine.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Ricardus on January 18, 2019, 01:11:18 PM
Worked fine for me =). P = I*U which gives you approximately 0.0007*105 = 0.0735W.  A standard 0.25w resistor works fine.

Thanks!

This is my next build. After a coupla Hairball 1176s, and some CAPI 312s.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: mosvelit on January 22, 2019, 05:52:01 PM
Hello there,

I'm new to this group and this is my first ever build  :P

Hope some of you could lend me a hand on some doubts I have:

1st: I bought a Haufe BV08 transformer for this mic but it has 6 wires instead of 4. I understand the two brown wires are some kind of shielding for the core.

I’d need to know where exactly each colour should be connected to. I looked at the schematic provided by Haufe but can’t make too much sense about which is the primary and secondary winding. Here it is:

https://www.don-audio.com/bilder/HAUFE-BV-08_T-7853.jpg

2nd: where each pin from the 7 pin xlr connector should be connected to the board.

Thank you for your help in advance!

Cheers,
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: Larsson on January 29, 2019, 02:49:23 PM
Hello there,

I'm new to this group and this is my first ever build  :P

Hope some of you could lend me a hand on some doubts I have:

1st: I bought a Haufe BV08 transformer for this mic but it has 6 wires instead of 4. I understand the two brown wires are some kind of shielding for the core.

I’d need to know where exactly each colour should be connected to. I looked at the schematic provided by Haufe but can’t make too much sense about which is the primary and secondary winding. Here it is:

https://www.don-audio.com/bilder/HAUFE-BV-08_T-7853.jpg

2nd: where each pin from the 7 pin xlr connector should be connected to the board.

Thank you for your help in advance!

Cheers,

Good luck with the build. Google "U47 schematic" to see how to set up the transformer. As the BV8 has dual windings on both primary and secondary you need to tie these together. So.. GN and GN should be tied together. The same for BL and WS. RT goes to P+, SW to P- which goes to ground.  BL goes to A+, WS to A-. Read through the thread to find info on how to connect the XLR.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: mosvelit on January 30, 2019, 12:42:07 PM
Good luck with the build. Google "U47 schematic" to see how to set up the transformer. As the BV8 has dual windings on both primary and secondary you need to tie these together. So.. GN and GN should be tied together. The same for BL and WS. RT goes to P+, SW to P- which goes to ground.  BL goes to A+, WS to A-. Read through the thread to find info on how to connect the XLR.

Thank you so much for your answer! Yes I already looked at the scheme but the wire colours on the secondary were flipped in the one I looked at and I was a bit confused.

I'll manage with the rest of the wires but the ones that I still don't understand where they should go are the brown ones on the Haufe (see the attached pic). I assume maybe they should both go to ground? Or maybe not even connect them.

Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TillM on January 30, 2019, 02:57:49 PM
both brown wires are ground.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: prophei on February 10, 2019, 10:13:31 PM
Hi All,

Thanks in advance for any help you give me, as I am just about to start my first build.

Some background... I bought the current kit D47 body kit from Danny, and got the power supply housing/pcb. As there are not instructions for the power supply, just a schematic, this is the part I am the most concerned with. I have done a lot of DIY, but not at such high voltages (I usually build stuff thats 9v to 15v).

The pcb board for the power supply is the D-EF47.
Transformer is the BV8 Classic
Capsule is the K7 (beez)
Tube is the Tele EF800

With his current body kit, there is an included polarity switch on the mic, and I am not sure how that does or does not relate to the power supply discussed in this thread, which seems to be based on the older mic pcb design. Am I in the right place, or is there a thread specific to this power supply that might be a better starting point for me given the above?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TillM on February 11, 2019, 03:43:19 AM
Look at the psu schematic.
I think you must omit R5 and R9 and of course don’t connect OM/CRD/COM.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: prophei on February 11, 2019, 10:14:18 PM
Look at the psu schematic.
I think you must omit R5 and R9 and of course don’t connect OM/CRD/COM.

Good call out, that removes the pattern switching circuitry?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: rockinrob86 on February 21, 2019, 12:43:46 PM
My mic has started having an intermittent issue.

It will work great and sound normal as it has since I built it, and then make a tube noise/scratching sound like a bad pot or something and lose about 15db.  I've tried a different XLR to my preamp with no change and manipulating the mic cable with no change.  After a bit, it came back to normal volume, but eventually faded again.

One thing I can think of is a couple weeks back, I was using the mic with a friend and had terrible distorted sounds in my DAW, so I jumped up, opened the mic and switched the tube out.  Only to realize that my interface had just gotten "off" and I needed to shutdown and restart.  The mic worked perfectly before this and afterwards for a while, but when I first heard this problem I switched back to the original tube and reconfirmed the voltage going to the amp.  Everything was good but now I heard the mic do this last night.

The only other thing is that months ago, the back diaphragm on my capsule was punctured (long story, a mounting screw came loose and banged into it in the headbasket.  there is a visible "ding" on the back mylar of the capsule now and omni has noise.
Cardioid was unaffected, but maybe the now open back is causing an issue?
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: iturnknobs on February 21, 2019, 02:44:33 PM
Rockinrob86-

You could firstly open the mic and disconnect the rear capsule. I would probably recalibrate the B+ voltage in that case. Secondly, if the diaphragm is shorting to the backplate, this might not "correct" the problem. I am guessing that an "open" is not your issue. Without being an electronics engineer, I would probably purchase the cheapest capsule possible that works in this circuit to begin the good old "guess and check" process, if all else fails.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: rockinrob86 on February 21, 2019, 03:05:49 PM
yea, this is what I was thinking too.  It is going to be frustrating to track this one down I'm afraid
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: geebeeVIE on February 21, 2019, 04:33:48 PM
Check the connection in the PSU that powers the relais that switches cardioid/omni.... had some nasty stuff happening when the mic was set to omni but the reed relais switched back to caridoid mode - including lots of distortion and a collapsed membrane because of the rising voltages caused by an off-thrown system.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: rockinrob86 on February 23, 2019, 08:59:02 PM
It appears my issues in this mic may have been cable related.  I took a good look at the entire path from the mic to the PSU, and resoldered a few joints here and there.  There was one connection on the cable that looked dodgy, but the rest looked ok.  Finished it up and used it for a couple hours with no hiccups, so knock on wood, I think everything is back to normal!
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bigbeaty on March 06, 2019, 03:46:43 AM
Hi guys,
I was very excited to receive my boards from Dany yesterday, and I'm looking forward to getting going with this super project.
Quick question on the mechanical, has anyone successfully built this into a thomann sct-800? It looks like a likely donor, and there's connectors etc to cannabalize. I just fear it's a bit too narrow!
Cheers,
Rich
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: TillM on March 06, 2019, 04:25:17 AM
No, the sct-800 body is too short for the pcb.
Title: Re: D-EF47 Tribute To Oliver Archut U47 Build Thread.
Post by: bigbeaty on March 06, 2019, 05:16:42 AM
Thanks TillM, Phew.. you just saved me blowing 175 Euro  ;)

Think I'll try and get hold of an Alctron long U47.

Cheers,
Rich