Class A monster: Aleph-X by Horst Wolf

Class A power amplifier Aleph-X by Horst Wolf

I have made nearly 400 pictures of my amp since the beginning of the build to see all build steps.
My name is Horst Wolf and I live in Germany / Bayern.
I tried to show you pictures where you can see some of the parts inside you normally can’t see.
I needed a whole year to think out the many difficult details and build the amplifier completely.
Build time from November 2009 to October 2010

Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf

The sound is really beautiful and amazing. I never need another power amplifier. I am hearing music with my Martin Logan Request electrostatic speakers.
This amp is specially tuned for my electrostatic speakers. For a normal Aleph-X it is difficult to drive the Martin Logan Request. I use very much current and less voltage.

The Magic Eye in the front shows the temperature of the heat sinks.

“The complete weight of this monster is mere 52 kg!”

The wiring part inside which is important for the sound quality was made with high quality cables from Van den Hul and from Kimber, partially wrapped specially. Inside you find eight pcs. big ultra longlife capacitors with each 100.000µF, four big with heat sinks cooled torobar coils and two big 600VA transformers. There is only a very little voltage ripple on the FETs rails because of the effective CLC filtering.
The two rectifiers are made with 8 single HexFred soft revorery and ultra fast recovery type high power diodes. This is good for less high frequency noise on the voltage rails.


Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf
Class A power amplifier Aleph-X by Horst Wolf

Additionally I use two speaker protection boards to supervise the offset of each output against ground. There are four hot outputs to supervise, because it is a Single Ended Class A Bridge amplifier.
If there is a high DC-Offset because of a defective on one of the outputs, the protection boards immediately are switching the amp completely off. The amp uses no relay in series of the signal path,
because this often reduces sound quality, especially when it becomes older.
The cold Aleph-X is starting with only 0,6V DC-Offset from each output to ground. Normally the offset of a cold Aleph-X amp is 10 times higher. Half an hour later you can measure less than 100mV.
This is only possible with a special thermal offset correction.

I think it is really one of the best sounding amps in the world.

 

About author of article:

Horst Wolf is coming from Germany / Bayern and he build this amazing amp.
Please visit his webpage at HorstWolf.de alternatively, you can send him a private message: Salomon of DiyAudio.com (you might need to register)
 


 
 

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