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Old 26th August 2011, 07:45 AM   #1
radio is offline radio  Macedonia
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Thumbs up 80W Hybrid Audio Amplifier!

Hi all !
I have this hybrid amplifier schematic with the ECC88.
So look for help with this amplifier.
Comments about this seed and the hybrid amplifiers?
Please anyone who can help with design saves PCB for schematic (Mr Alex mm help designed around the PCB, of course, if you are able-to then people enjoy your art?)!?).
Thank you all and cheers !!
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Last edited by radio; 26th August 2011 at 07:53 AM.
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Old 26th August 2011, 03:19 PM   #2
alex mm is offline alex mm  Europe
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Hi radio ,
Quote:
I have this hybrid amplifier schematic with the ECC88.
So look for help with this amplifier.
Please anyone who can help with design saves PCB for schematic.
Why not ask first designer Dr. Bora ? maybe can help you somehow , I'm to bussy these days .
Thank you Alex.
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File Type: gif iota-cd.gif (12.4 KB, 1031 views)
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Old 26th August 2011, 03:37 PM   #3
juma is offline juma  Serbia
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Originally Posted by radio View Post
Hi all !
I have this hybrid amplifier schematic....
Great! Where did you get it ?
And why is the amp's name changed and author's name deleted ?
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Old 26th August 2011, 04:10 PM   #4
radio is offline radio  Macedonia
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Originally Posted by juma View Post
Great! Where did you get it ?
And why is the amp's name changed and author's name deleted ?
The author of this hybrid is a D-r Jagodić Bora!
I need a PCB for this schematic, anywhere because they can not be found.
If someone has done this hybrid please tell what are the experiences?!
thanks and cheers
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Old 2nd July 2014, 07:46 PM   #5
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Anyone build the IOTA-CD amplifier? What about changing bjt vas to jfet or mosfet vas?

I have attached the updated schematics with DC servo.
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File Type: pdf IOTA-CD PSU sema.pdf (59.7 KB, 79 views)
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Old 2nd July 2014, 09:41 PM   #6
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Pity no further development of this project...

80W/8Ω seems reasonable and good challenge...
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Old 2nd July 2014, 10:23 PM   #7
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There is nothing to be further developed regarding this one! Design is fully functional, built and presented before 50+ audiences on last audiophile-meeting in Kragujevac on 03 of May 2014. Amp attracted significant attention for beautiful, transparent, precise and natural sound.

***Sorry, PCB files are not available exactlly because of people like RADIO and alike!!!
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Last edited by boraomega; 2nd July 2014 at 10:44 PM.
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Old 3rd July 2014, 05:52 AM   #8
Vostro is offline Vostro  South Africa
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Quote:
Originally Posted by boraomega View Post
There is nothing to be further developed regarding this one! Design is fully functional, built and presented before 50+ audiences on last audiophile-meeting in Kragujevac on 03 of May 2014. Amp attracted significant attention for beautiful, transparent, precise and natural sound.

***Sorry, PCB files are not available exactlly because of people like RADIO and alike!!!
Pity boards are not available, I've been wanting to build a amplifier with tubes for quite some time now, Hybrids seem nice since I don't have output transformers.

Maybe I should look for a tube preamp instead.
Anyone have info on a nice tube preamp?

regards
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Old 3rd July 2014, 06:05 AM   #9
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Quote:
Originally Posted by Vostro View Post
Maybe I should look for a tube preamp instead.
Anyone have info on a nice tube preamp?
Guys on the valve forums can help you out.
I've built Aikido tube preamp and it sounds great, hum free since it intrinsically cancels out PS ripples.
PCBs are available at John Broskie's website at tubecad.com
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Old 3rd July 2014, 06:14 AM   #10
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Quote:
Originally Posted by Vostro View Post
Pity boards are not available, I've been wanting to build a amplifier with tubes for quite some time now, Hybrids seem nice since I don't have output transformers.

Maybe I should look for a tube preamp instead.
Anyone have info on a nice tube preamp?

regards
Hi Vostro, see my hybrid front-end project here - Low TIM, low distortion hybrid front-end - maybe this is something you are looking for. It is fully prototyped, tested and documented.
It may be successfully used with a number of power sections, one of then is shown there in my thread, the other good option is Ostripper's Slewmonster.

More detailed measurements are available here - Measurements - Hybrid with tube

Listening impressions will be available over the weekend, though - no doubts - they don't promise to be bad

Terry (still4given) will have some spare PCBs for this design.

Cheers,
Valery
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File Type: jpg @Tube-!Sch-02.jpg (284.8 KB, 578 views)
File Type: jpg DSC03216.JPG (280.9 KB, 524 views)
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