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Old 30th October 2007, 10:33 PM   #1
velicko is offline velicko  Serbia
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Default High End AB Class Amp - Need recomendation

Dear All,

Would someone be so kind to recommend "building guide" or at least schematics for the 50 to 80 W high end AB Class amplifier.

Why not straight A class?
I would not like to invest into 3 or 4 KW power supply for straight A class amp. in order to achieve high quality 50 W amp.

So, the best possible but I would stick to AB class, bipolar or FET.

AMP would be used with modified CD player, sometimes with high end tube preamp sometimes with OPAMP premplifier...

I do prefer Jazz music, room is small, speakers are Wharfedale mid class, but will be exchanged for something better soon...

And... Amp will be built by high experienced friend... not by me.
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Old 31st October 2007, 03:17 AM   #2
RSK is offline RSK  Malaysia
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Default 50W High End

Try this link(http://www.geocities.com/d_zeman/audio.html)

They sound pretty good.

Cheers.
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Old 31st October 2007, 07:16 AM   #3
djk is online now djk
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The Zeman amp is basically a Leach.

Why not build the real thing?

Original, simplest version:

http://users.ece.gatech.edu/~mleach/...77articles.pdf

Improved, current version (only one pair of outputs needed for 80W):

http://users.ece.gatech.edu/~mleach/lowtim/
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Old 31st October 2007, 03:06 PM   #4
taj is offline taj
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Lots of good ones to choose from (beside Leach, already mentioned):

AKSA/Soraya http://www.aksaonline.com/products_2.html (kit)


Quasi http://www.adam.com.au/cgpap/QuasiWeb/index.htm


SymAsym http://www.lf-pro.net/mbittner/Sym5_...ymasym5_3.html


Graham Maynard's GEM http://www.gmweb2.net./


ESP/P3A http://sound.westhost.com/project3a.htm


probably many others.

..Todd
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Old 3rd November 2007, 07:50 PM   #5
velicko is offline velicko  Serbia
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Dear friends,

Thank you for all answers.

Much to think about before starting..

Thanks.
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Old 3rd November 2007, 08:28 PM   #6
Nordic is offline Nordic  South Africa
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Destroyer X's HRII amp.
Complete construction files can be found here.

http://www.dxamp.com/construction/
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Old 4th November 2007, 07:18 AM   #7
KLe is offline KLe  Australia
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Hi velicko

Yes, also have a good look at the SKA GB300D ... http://www.ska-audio.com/diy/003.html

This is the one I use and I like it very much ...
ciao
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Old 4th November 2007, 07:28 AM   #8
Magura is offline Magura  Denmark
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How much power are you willing to spend for 50W ?

Magura
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Old 4th November 2007, 08:35 AM   #9
velicko is offline velicko  Serbia
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Quote:
Originally posted by Magura
How much power are you willing to spend for 50W ?
500W sounded "normal" to me... Even 700...

While I was considering pure class A, a friend of mine, that will help me build any amp I choose, was stating that if I do want no compromise high end class A amp for 50 to 80 W power I should invest in minimum 2KW PS, up to 4 KW...

With constant power, and heating even more when there is no sound... I would not like it... spending energy.. heating room... too large...

That is why I would build something out of A class...

Thanx
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Old 4th November 2007, 01:34 PM   #10
Magura is offline Magura  Denmark
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Quote:
Originally posted by velicko


500W sounded "normal" to me... Even 700...

While I was considering pure class A, a friend of mine, that will help me build any amp I choose, was stating that if I do want no compromise high end class A amp for 50 to 80 W power I should invest in minimum 2KW PS, up to 4 KW...

With constant power, and heating even more when there is no sound... I would not like it... spending energy.. heating room... too large...

That is why I would build something out of A class...

Thanx
For 500W per channel, you can get real class A. If you want to make things run off of less than 500W, you can go for pseudo class A. There are a number of solutions to that, one of the most elegant solutions to get "almost class A" without spending a lot of power (relatively speaking), is the Aleph series from Passlabs, or the AX series from the same house. When all is said and done, you get at least 30% efficiency from those amps, and can get higher if willing to do further tradeoff.

Aleph-X builder's thread.

If you decide to build such, get in touch with Steenoe, as we made an updated BOM for this thing that is somewhat less prone to get people into difficulties than the original BOM.

Magura
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