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-   -   The Very Best Amplifier I Have Ever Heard!!!! (http://www.diyaudio.com/forums/solid-state/174468-very-best-amplifier-i-have-ever-heard.html)

NagysAudio 29th September 2010 12:40 AM

The Very Best Amplifier I Have Ever Heard!!!!
 
I've worked in the audio industry for more than 10 years, this is by far the very best amplifier I have ever heard and I've heard them all.

http://i189.photobucket.com/albums/z...s005/OPAmp.jpg

http://i189.photobucket.com/albums/z...5/scan0002.jpg

http://i189.photobucket.com/albums/z...5/scan0001.jpg

planet10 29th September 2010 01:11 AM

What are the missing values at the top of scan3?

dave

NagysAudio 29th September 2010 01:12 AM

They are the same as the ones on the bottom.

lineup 29th September 2010 01:20 AM

The topology is not unusual.
There are amplifiers which are almost like that.

There are 3 things I notice are a bit special.
- The use of a DUAL JFET in input.
- The triple paralleled 2SK134/2SJ49 lateral MOSFETs in output.
- The separate regulated input/VAS supply.

The last point, the separate regulated supply for Input/VAS
is something I have recommended many times.

Because it is just crazy to supply the sensitive first stages
from a heavy current un-clean output supply.

Still stupid designers, over and over, keep on putting all of one power amplifier
to use one and same suppply!
This shows a fundamental lack of understanding what happens
when we run an audio amplifier feeding loudspeakers.

NagysAudio 29th September 2010 03:46 PM

I completely agree with you regarding the regulated power supply for the input stage. I haven't seen this kind of topology in other amplifiers, per se. Which amps are almost identical?

alex mm 29th September 2010 04:28 PM

PCB layout today in.....few hours
 
2 Attachment(s)
Nice schematic , and my contribution to diyaudio forum :)
Regards Alex.

Voegelchen 29th September 2010 04:42 PM

The grounding seems to be discussed......
You have mixed Signal, Feedback and Power GND.....

masag1 29th September 2010 05:01 PM

Wish I could do so nice pcb's.

Good job, Alex :worship::worship::worship:

Regards

Sam

a.wayne 29th September 2010 05:01 PM

Hello,

Lineup, sometimes stupid designers need to meet marketing/cost/retail functions to make profit, it helps to sustain the medium ....... Profits!!!


Nice PCB layout Alex


regards,

alex mm 29th September 2010 05:14 PM

PCB revised .....
 
2 Attachment(s)
Thank you , I attached an new picture with separate ground layout for power and signal ....;)

Regards Alex .


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