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Old 19th February 2007, 09:21 PM   #51
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Default Re: Re: So:

Hi,
Quote:
Originally posted by lineup


bogdan, what do YOU think?

at least you may have an idea, by study schematic a bit



My own idea:
- Excellent matched input pairs. Expensive transistors? YEEEES!
- Full Class A output stage. Does Op-Amps have this? NO!
.... 98% of them OP have a Current idle supply TOTALLY of <10mA
.... This amplifier has got 40mA idle, only in output stage
.... Which means it will put out close to 80mA in True Class A


lineup
witch schematic?
the one you postet last?
it has an idle current in output stage of 15mA. So this amplifier is only capable of delivering 10mA eff. in "True Class A"
Regards
Jürgen
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Old 19th February 2007, 09:26 PM   #52
Electrons are yellow and more is better!
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Default Re: So:

Quote:
Originally posted by bogdan_borko
What makes this preamp THE "HI END" ???
High End is a bit vague. My take to this is a well done design, using good parts, good pcb and a nice looking enclosure.
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Old 20th February 2007, 01:50 AM   #53
lineup is offline lineup  Sweden
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Quote:
Originally posted by bogdan_borko
1."Expensive transistors?" - NOt a high end argument!

2.It didn`t ment to copare it with op amps...

3."This amplifier has got 40mA idle -" NOt a high end argument!

4."Which means it will put out close to 80mA in True Class A" - all discrete preams work in TRUE class A.


so?

So?
Right, I was wrong all the way
... in your book

You read posts and opinions of me, with dark coloured eye, it seems.

We have a saying in my country:
Look at me with you good and friendly eye, please.

As people can be both good and bad .. no one is 100% of any,
This is a way to tell that our attitude towards others
can be positive or negative.
We have two (2) symbolic eyes .. one good and one bad eye.

And this is a choice we HAVE ... to BE Positive or to BE Negative.
As long as you automatically lets your mode select
you often end up to be EGOistic and Negative to others.

A way to counter this tendens, is to Actively make a positive choice:
Treat others like you want to treated and looked upon.

It is also said: you SHALL love your fellow man.
It is a command .. TO LOVE.

If we were not responsable for love and hate, means we can not make a choice.

But as humans.. we have a will and can make decision TO LOVE or NOT TO LOVE
and TO HATE and NOT TO HATE and Despice some body.

This is why we are the ones that also are to blame for all hate and killings.
And also those that are, hopefully, the ones creating love
by saw a seed, that can become a Rose in the end.

--------------------------


Bogdan, my enemy

you still haven't given your own opinion on this great amplifier design
maybe you do not want to risk somebody else will express another opinion
and argue with you
Don't be afraid, do like me, state your opinion!



well, you asked - I answered
If you are not satified with my opinion
maybe you can tell us all what is bad with this amplifier
Surely I have seen many preamplifer I like less
and which most probably would not match the performance of this on.


lineup
Lineup Audio Lab Amplifiers
http://lineup.awardspace.com/
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Old 20th February 2007, 01:59 AM   #54
lineup is offline lineup  Sweden
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Default Re: Re: Re: So:

Quote:
Originally posted by juergenk

it has an idle current in output stage of 15mA.
So this amplifier is only capable of delivering 10mA eff. in "True Class A"

Regards
Jürgen

What I know it has got and can be made, at least, to have 40mA.
But if you do not like this amplifier,
nobody is going to force you to try it.
So, I guess, you will never know, for sure .. if it is bad or good.

maybe you will miss something, maybe not
but you will never know
what others previously in this topic know:
That this is a good amplifier.


Regards to germany
lineup - wont change his opinion on what is good ( better than most op-amps )
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Old 20th February 2007, 05:11 AM   #55
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Default Re: Re: Re: Re: So:

Hi,
Quote:
Originally posted by lineup

What I know it has got and can be made, at least, to have 40mA.
so you are running the transistors with 600mW?
Not bad!
Regards
Jürgen
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Old 20th February 2007, 12:22 PM   #56
Pasul is offline Pasul  Czech Republic
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Hello all,
is here anybody who built this preamp and everythink OK?I look on this schematic and see eror in DC servo.This circuit must have problem with DC on output.
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Old 20th February 2007, 01:18 PM   #57
Electrons are yellow and more is better!
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My QRV-01 headphone amp looks similar. The Elektor design is OK according to me, with pretty high performance if the power supply is good.

The offset will probably be no problem with since the SSM2210/MAT02 // SSM2220/MAT03 has rather low offset and on top of the that you have bias current compensation (T12).

BTW: I have SSM2210/20 for sale.
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Old 20th February 2007, 06:14 PM   #58
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Come on man (Lineup) I`m not your enemy I AM A FRIEND! You`re contribution to the forum is big and I have nothing against you.

I wanted to say that elektor likes to put stickers "HI END" on everything and I`m curious what makes this design to be HiEnd?

Complementary, high price transistors, output in class A... that are not arguments for HiEnd.

Wath abut OLG and OLB.

Cheers!
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Old 31st July 2007, 08:55 AM   #59
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Hi

I have just built a headwize kumiza III headphone amplifier and was thinking this design is similar for a matching phono amp.

Did many people make the design with the servo, i have a few BC560/550 of the head amp and it uses a servo like the head amp so hopefully will be of similar SQ.

http://www.amb.org/audio/ck2/

http://headwize.com/ubb/showpost.php...=55301&fpage=5

John
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Old 4th October 2008, 02:47 PM   #60
muflon is offline muflon  Czech Republic
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Default sample

functional sample...
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