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 !!
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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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
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!!!
***Sorry, PCB files are not available exactlly because of people like RADIO and alike!!!
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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
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
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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Between our illustrious family and those no longer with us we have built a few and posted all the details of a few on here.
I'll have a search and see if I can find the links but they are the Borbelly and the Impasse.
This was Andy's thread on the Borbelly build when he was alive and building the Aleph 4 which I've now got.
You need to dig quite deep into his obsession. http://www.diyaudio.com/forums/pass-labs/172276-aleph-4-strickly-diy-project-build.html
Sadly he sold the Borbelly.
Here is the Impasse, I built one of these.
http://www.diyaudio.com/forums/pass-labs/136835-impasse-preamplifier-85.html
You need to dig quite deep into his obsession. http://www.diyaudio.com/forums/pass-labs/172276-aleph-4-strickly-diy-project-build.html
Sadly he sold the Borbelly.
Here is the Impasse, I built one of these.
http://www.diyaudio.com/forums/pass-labs/136835-impasse-preamplifier-85.html
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Can you please tell me what is the gain of the amplifier and how much feedback does it use?
Thanks
Indeed it's a pity that the boards are not/cannot be available. A hybrid 80W would be nice to build. Anyway. 😎
For preamps tube preamps, I saw a diyAudio member that has his own site showing very nice projects, like this:
DIY 6922 / E88CC Tube preamp
Nice! 🙂
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Forgive me my amateur questions. MJE350 is VAS or IRF530 is single-ended VAS fed by IRF9530 CCS?
Thanks.
Thanks.
Bumping because i'm curious as well.
IMO, MJE350 is only (close to) unity gain common emittor, notice that emittor and collector resistor values are nearly the same. I agree the voltage gain is done by the n-channel MOSFET with CCS load.
IMO, MJE350 is only (close to) unity gain common emittor, notice that emittor and collector resistor values are nearly the same. I agree the voltage gain is done by the n-channel MOSFET with CCS load.
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If you are looking at post 5...
I also interpret the schematic as you do, the LTP drives the BJT MJ350 who's sole purpose is to voltage shift the signal from the high voltage front end to the lower voltage output stage. The IRF530 is the VAS and operates with a CCS load to provide a Class A amplifier driving the load through a small 47R resistor. Then the power BJTs provide a Class B/C stage driving the load through the output inductor. The inherent distortion of the BJT power stage is compensated for by the Class A stage using feedforward. Pretty neat altogether.
I also interpret the schematic as you do, the LTP drives the BJT MJ350 who's sole purpose is to voltage shift the signal from the high voltage front end to the lower voltage output stage. The IRF530 is the VAS and operates with a CCS load to provide a Class A amplifier driving the load through a small 47R resistor. Then the power BJTs provide a Class B/C stage driving the load through the output inductor. The inherent distortion of the BJT power stage is compensated for by the Class A stage using feedforward. Pretty neat altogether.
Hi, Valery
I've been following your thread.
As soon as Terry gets boards I'll contact him to see if he is willing to sell me a set of boards.
I'm to eager to follow his build a well.
I have new old stock of those tubes and tube sockets for them,
I'll have a closer look to see what power transformers will be needed
Regards
I've been following your thread.
As soon as Terry gets boards I'll contact him to see if he is willing to sell me a set of boards.
I'm to eager to follow his build a well.
I have new old stock of those tubes and tube sockets for them,
I'll have a closer look to see what power transformers will be needed
Regards
Would it be possible to implement modulated CCS like in Pass´s Aleph amplifier for the IRF530 VAS?
Why MJE350 is not emitter follower? Wouldn´t it be better to have lower impedance drive for the IRF530?
Why MJE350 is not emitter follower? Wouldn´t it be better to have lower impedance drive for the IRF530?
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