The Very Best Amplifier I Have Ever Heard!!!!

NagysAudio · 29th September 2010, 12:40 AM

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.

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

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

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

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

Regards Alex .

29th September 2010, 12:40 AM	#1
NagysAudio Banned Join Date: Sep 2006	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.

29th September 2010, 01:11 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	What are the missing values at the top of scan3? dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

29th September 2010, 01:20 AM	#4
lineup diyAudio Member Join Date: Dec 2005 Location: the north	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. __________________ lineup

29th September 2010, 04:42 PM	#7
Voegelchen diyAudio Member Join Date: Jun 2010 Location: Germany and www.aca-vogel.de	The grounding seems to be discussed...... You have mixed Signal, Feedback and Power GND..... __________________ Designing audio electronics isn't a job, it's a mission

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29th September 2010, 01:12 AM	#3
NagysAudio Banned Join Date: Sep 2006	They are the same as the ones on the bottom.

29th September 2010, 03:46 PM	#5
NagysAudio Banned Join Date: Sep 2006	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?

29th September 2010, 05:01 PM	#8
masag1 diyAudio Member Join Date: Dec 2008	Wish I could do so nice pcb's. Good job, Alex Regards Sam

29th September 2010, 05:01 PM	#9
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	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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