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Old 10th May 2003, 01:46 PM   #1
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Default Industrial AlephX High Power version

Inspired by many people here and after reading an endless amount of posts in different AlephX threads I decided to brew something for my own.
And finally, here are the results:
From the start the idea was to give the amp a solid and industrial look.
With the black anodised heatsinks and the alu this was not a very difficult task. However, I tried to use the Ďmetalí colours as much as possible. I cut off the plastic from the small caps on the driver board, and maybe in time Iíll dismantle the big caps in the PSU also. Just for the look. Iím not sure if I can hear difference in sound, if any.
The cap-bank is placed on an alu plate, which is held in place with alu pipes and shiny bolts. The biggest nuts and bolts I could get at the local store were used for the feet.
The front and top have no cover, and I still canít decide if Iíll ever make them. No children around, only the cat. Big problem for the blue LED.
There are still some resistor values to play with as you can see on the point to point board.
That board is entirely made p-to-p, with the wires as much as possible on the backside.
Itsí quite small, 10 X 8 cm (3,94 X 3,15 inch) and carries all of the components except the power transistors and surrounding components. No fancy stuff was used in the whole amp.
Guess I would have to order the black gates at Jean-Paulís and the Vishay-Dales at Peter Danielís)
The output resistors (2 x 8 x 0.47ohm in parallel) are well tied together, and some people already asked me where the ignition is mounted.
I had (and still have) a problem with the power supply. The caps I bought are rated 25V. The power transformer is 22-0-22 and after the bridge and caps I get 28V under load. Thatís why I had to mount two series resistors after the rectifier. They spoil a huge amount of heat and mounted together with the rectifier on the alu plate, it gets too hot.
Thanks to Grey and Nelson, Peter Daniel (inspired me the most with the mechanical building), and others, from which I learned a lot.
They will drive two B&W800Matrix, who are located in the huge living room of the old factory where we live. (Always liked old factories and industrial stuff).

/Hugo - Up to the bench for the making of BOAXÖ (Brother_Of_AlephX)
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Old 10th May 2003, 01:49 PM   #2
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Old 10th May 2003, 01:51 PM   #3
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Old 10th May 2003, 01:52 PM   #4
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Old 10th May 2003, 01:53 PM   #5
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Old 10th May 2003, 02:02 PM   #6
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Default Next to the speaker

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Old 10th May 2003, 02:20 PM   #7
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Thanks for posting! Excellent PtoP wiring.
I was wondering if those were B&W 800's! Very nice
setup : ) The 800's don't have to be bi-amped?

sorry to hear about your power supply problem. I guess the only
thing you can do in the end is get a new transformer...

thanks for sharing!
it's nice ot see some AX's start to show up.



moe29
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Old 10th May 2003, 02:24 PM   #8
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Hugo,
looks very good. what was the story in the end with the measurements? Do you still hear the distortion? What do the rail end up to be after the resistors? What bias do they run? What mosfet did you use?

The only thing I would change is the placement of the voltage drop resistors from where they are to the base plate. That should increase the life span of the caps.
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Old 10th May 2003, 02:28 PM   #9
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I new you would reply as first!!

Those B&W's can even be tri-wired, altough they play very good with a single wire. I bi-wired them till now.

Yes, that power supply...maybe I sell those transformers, and bye other ones. The trouble is that these ones are 1000VA and the 18-0-18 I can bye are only 750VA.
Or I change the caps. Or find something else. Still don't know.

/Hugo
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Old 10th May 2003, 02:35 PM   #10
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Now, you inspired me Very nice.

If you decide not to use front and top covers, you might install 2 square bars on top between heatsinks for more complete look and rigidity.
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