Death of Gain Clone

[carlosfm]

Originally posted by widowmaker
Chip Amp (doesn't matter wich one) and High-Fidelity are quite different concepts
If you're not able to sense the differencies....

The differences are clear as water, don't worry.
This amp was a huge downgrade to my system, when I tested it some time ago.
It's like throwing a blanket over my speakers.
LM3886 power amp back in, REAL music is back.

[lineup]

Amazing carlosfm
What a little chip amp can do!

[widowmaker]

Originally posted by carlosfm

The differences are clear as water, don't worry.
This amp was a huge downgrade to my system, when I tested it some time ago.
It's like throwing a blanket over my speakers.
LM3886 power amp back in, REAL music is back.

This is a factory made, conventional, not DIY amp...
I want to add some comments about High End and High Fidelity:

Really High End amplifiers are not made by some stupid engineers from known "great" manifacturers...even they have label "high-end".

Hiroyasu Kondo... and many other are the men who can make the real sound...

[tiltedhalo]

Have all you solid state guys forgot that current dumping feed forward NFB can easily be applied to a chip amp??? Hmmmmm....... Then you have a common substrate current class A up to out puts and matched Qausi out-puts and feedfoward current dump for the outs. oh yea and you onlu have to add 2 resistors an inductor and 2 caps.

[tschrama]

That sound interesting... can you show?

How about traditional ZEN amplifier with some addition CurrentDumping output stage, would that be possible?

Or didI understand correctly, that for proper CurrrentDumping to work you need nearly infinite openlop gain (opamp like..)?

[tiltedhalo]

Yes I believe you will need a stable unity gain chip, but the lm38-- series could work useing a lm318 buffer useing a global feed forward
network. basicaly you should get the best of all worlds.

[widowmaker]

In this cause (chip amp) you have more components (inside in chip) than I have in my schematic...
More components=poorer sound quality...it is a fact...
QUAD 405 has a lot of components and this is the reason for his oblivion...
More open loop gain...yes, but not much more, just enough...

[tiltedhalo]

Dont get me wrong widowmaker you design looks to be very good and I will probably try it, but from the gain clone stand point everybodys looking for the next great breakthrough and when people get excited about adding a snubber to there clones power supply, well you get the idea.... I would love to see some more information possible some pics of your amp????

[widowmaker]

Originally posted by tiltedhalo
I would love to see some more information possible some pics of your amp???? [/B]

What exactly you want to see?
Inside? Power supply?
Power supply is separately for class A and current dumpers
I have CLC filters on PS for class A.
2SK301R working @ Id=7mA (each). They are matched pairs - Id=10-11mA @ Ugs=0V.
More Id = more open loop gain.
Current mirror helps for increasing the open loop gain too.
As you see I don't put the source resistor on IRF9610.
The reason is the same...

[carlosfm]

widowmaker, you started an unnecessary discussion because of the name you gave to your discrete amp.
It beats your 'GC', so what?
I have beaten my 'GC' several times, even using the same chip, the LM3886.
In the same way you can give the same bunch of transistors to several people and they will make different amps with them, some good, some not so good.
And even more, following the same schematic, results can be different from implementation to implementation.

Btw I know the Krell is a commercial amp, and as most of them it has stupidity all around inside it.
The 750VA toroid is not bad, and the heatsinks would be salvageable too.