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Old 29th September 2010, 12:40 AM   #1
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Default 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.

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Old 29th September 2010, 01:11 AM   #2
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What are the missing values at the top of scan3?

dave
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Old 29th September 2010, 01:12 AM   #3
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They are the same as the ones on the bottom.
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Old 29th September 2010, 01:20 AM   #4
lineup is offline lineup  Sweden
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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.
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Old 29th September 2010, 03:46 PM   #5
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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?
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Old 29th September 2010, 04:28 PM   #6
alex mm is offline alex mm  Europe
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Default PCB layout today in.....few hours

Nice schematic , and my contribution to diyaudio forum
Regards Alex.
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File Type: jpg MOSFET AMPL.JPG (807.5 KB, 27641 views)
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File Type: pdf MOSFET PDF.pdf (156.6 KB, 5990 views)
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Old 29th September 2010, 04:42 PM   #7
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The grounding seems to be discussed......
You have mixed Signal, Feedback and Power GND.....
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Old 29th September 2010, 05:01 PM   #8
masag1 is offline masag1  Germany
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Wish I could do so nice pcb's.

Good job, Alex

Regards

Sam
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Old 29th September 2010, 05:01 PM   #9
a.wayne is offline a.wayne  United States
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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,
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Old 29th September 2010, 05:14 PM   #10
alex mm is offline alex mm  Europe
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Default PCB revised .....

Thank you , I attached an new picture with separate ground layout for power and signal ....

Regards Alex .
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