View Full Version : Tube preamplifier ton corection Dr.Bora Jagodic design

alex mm
07-24-2010, 06:38 PM
Hi all ,
My first tube preamplifier , was build few months ago and I'm very pleased how it sound .
Schematic diagram and PCB designed by Dr.Bora Jagodic .;)


07-25-2010, 09:15 AM
Very nice project, I wish I could make one like this, But I knew its costy.

is it?

alex mm
07-25-2010, 02:45 PM
........the price it's almost 100 euro and more pictures

11-22-2010, 10:18 PM

If you don;t mind. can you share the pcb and laout and schematics?
Do you have the files in pdf form?

thank you

02-01-2011, 02:43 PM
Do you have any amp in stock to sell me one?

alex mm
02-02-2011, 11:08 AM
Sorry it was build for home not for sale .I can give you this link http://bas.elitesecurity.org/indexV.html

04-23-2011, 05:53 AM
Is someone measured the preamplifier, as soy second and third harmonic?
Of them can be seen eating this Tube preamplifier has the right Tube (Valve) sound!

Where you can find the project Tube preamplfier: IOTA-CD of D-r Bora?:w)

alex mm
04-23-2011, 07:25 PM
875876Hi radio ,
No I have not make any mesurements regarding preamplifier but the sound it's what i like to hear ! yes you right it's an valve sound , warm , dinamic .......
I dont know any link to IOTA -CD of Dr. BORA J. but I have something saved in my computer .

04-24-2011, 07:55 AM
Hello Mr. Alex !
Is this you have the PCB for a complete project (IOTA-CD) !
Since I do I create this Hibrid Audio Amplifier!!
thank you
Best Regards

07-24-2012, 06:21 PM
Hi Alex,
Pcb layout for this preamp is not available at website, can you post it.

alex mm
07-25-2012, 12:26 PM
Hi TY,
Sorry for delay ....... if you need something else please ask ......;)

07-26-2012, 07:10 PM
I will be starting to collect parts soon.
do you have a better copy of component lay out.

alex mm
07-27-2012, 12:50 PM
and component side , top side .......

07-29-2012, 09:57 AM
and component side , top side .......

Thank You, Will start with pcb etching.

08-03-2012, 08:45 PM
any guidance how to get this Pre amp working,
at couple of places its written bypass what is it for and what to do with balance.

I am Readying the BOM,
there is trim pot on Psu Pcb, How much to adjust it for what current.
And specification about brand of parts to be used or I can use as per availability.

09-30-2015, 06:03 AM
Mr Alex Best regardS!
One question: Do you have a PCB board this hybrid amplifier (IOTA)?
If you have to buy it in Macedonia-Skopje?
Thank you!

01-28-2017, 01:51 PM
Very nice project!

12-10-2017, 05:39 AM
Hi TY,
Sorry for delay ....... if you need something else please ask ......;)

Hi Alex
thank you for sharing this project
very nice
can you please share schematic in PDF file and good quality?
i want crate new PCB for this project and share it here
do not need wire more in new PCB
thank you
my email address is Hadi.ghr.e.61@gmail.com
you happy me if share more project by tube lamp with me
thank you so much dear and have a good time.

alex mm
12-11-2017, 03:36 AM
Thank you for comments, schematic attached !
Regards,Alex 6475

alex mm
02-10-2019, 07:35 PM
Hi all,
New year, new build ,since this nice preamplifier with tone correction it's working from 2010, I decided to rebuild in new revisited PCB . Here are the pictures

02-10-2019, 08:24 PM
Nice work Alex congratulations well done

05-17-2019, 01:08 PM
Very nice work and PCB. Do you have the Gerber files for the PCB?


alex mm
05-18-2019, 10:49 AM
Yes I have gerbers but are not available . Final product ....

05-19-2019, 02:52 PM
Nicely done. Can you share revised Pcb and schematics.

05-24-2019, 06:16 AM
Just let him enjoy it! Maybe after he gets bored he'll then share it.x-(