D-EF47 Tribute To Oliver Archut U47 Build Thread.

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





PCBS


Mic


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.




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://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a070fa.pdf
https://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a0710a.pdf
https://cdn.groupbuilder.com/groupdiy/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://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a0712b.zip

could not be happier with this Toy,
Thanks Oliver.

Hope you will enjoy,
Best,
Dan,

Schemo Mic
https://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a0713c.pdf


Schemo PSU
https://cdn.groupbuilder.com/groupdiy/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://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a0715f.pdf



This is Hoe it happened,
Best,
DAn,

Pictorial.






























































































Shown is the D47 dual tube  but the principle and connection are the same just forget about the other tube










Best,
DAn,

Reserved.....

Reserved........

...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...

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.

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!

Back view

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.

Hi,

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

Regards

Spence.

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

maq3396 said:

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

Click to expand...

Thanks Mac, Yes I will pass it on once it pass all the testing.
Best,
Dan,

Hi,

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

Regards

Spence.

Few more tweaks later.

Regards

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

poctop said:

Thanks Mac, Yes I will pass it on once it pass all the testing.
Best,
Dan,

Click to expand...

Very interested in pcbs for Olivers version of the U47. Thanks for doing this, Dan!
Bernd

This is awesome! What is the bottom bell part?

Thx,
jonathan

Spencerleehorton said:

Few more tweaks later.

Regards

Click to expand...

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,

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.

hi 0dbfs,

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

regards

Spence.

Some more pictures