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steenoe 31st December 2006 02:23 PM

Aleph-X monoblocks finished.
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Finally I finished my Aleph-X’s. I couldnt stop listening to them, so I sat up half the night.
Man, the hours that went into those amps are countless. But I am happy with the end result, indeed.
Having built a few Zen’s and Aleph’s, I think the A-X has the most firm, tight and extended bottomend.
My speakers are 86db sensitivity so I guess they like the power reserve these monoblocks offers.
They can play loud with the A-X’s, really loud without whining at all.
I have been struggling with the adjustment of the amps like everyone else and luckily my mate Magura came to my resque, thanks a lot for that. In the same breath I also want to thank him for
much of the hardware that went into these amps; heatsinks, faceplate’s and the very nice handwound inductors. That guy is a Craftsman par excellence.
A big thanks to Mr. Nelson Pass ofcourse without him no Aleph’s, and thanks to Grey Rollins
for putting the schematic together for us. Not the badest idea a guy could have.
A big thanks to wuffwaff and Netlist for their ungoing support for all the Aleph-X builders.
Okay thats enough, I better stop before someone gets wet eyes.
Specs: 2x18V, 1000VA trafo, Bigparsnips rectifier boards with MUR3020 soft/fast’s, 4x 68000uF Rifa’s and 2 pcs. 2mH aircore inductors per monoblock
12 IRFP240 per channel. The supply voltage is +/- 22,7V under load. DC offset at the output is 12mV and 18mV. They weigh in at 33 kg each. Other than music, they are dead silent.
I think the Aleph-X approaches the full package; they comes very close to the desired sound.
With a topend thats better than the Aleph’s (probably a result of the X?) and a bottom that really kick’s *** this is it for me. The Babbelfish still has a tad silky’er topend but the bottom is not near the Aleph-X. Not surprising though, since the A-X is about 100 watt’s and so not wimpy in any way. Its fitting that they are finished right now, since they can throw a party like nothing else.
What else do you need on New Years evening:-) I will post a few pic’s.

Happy New Year guy’s


steenoe 31st December 2006 02:24 PM

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As you can see, I made them symmetrical.

steenoe 31st December 2006 02:26 PM

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I had the bolts holding the heatsinks machined.

steenoe 31st December 2006 02:27 PM

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Inside. They are fairly packed.


DocLorren 31st December 2006 02:29 PM

Excellent! Very nice work. No, make that very very nice work.

Babowana 31st December 2006 02:29 PM

Ahh . . . gly

Enjoy, man

Happy New Year!

steenoe 31st December 2006 02:37 PM

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Thanks guy's:) The project started out like this:D

Jan Dupont 31st December 2006 03:16 PM

You did an exelent job :nod: :nod:

moe29 31st December 2006 03:19 PM

those are sweet! :) well done!!

send pics to PassDIY... they need some new blood in the Gallery!

P.S. forgot the most important spec, how much do they weigh?

(they look about as much fun to move around as my Aleph 2s)


ElectroNick 31st December 2006 04:05 PM


Originally posted by steenoe
They weigh in at 33 kg each. Other than music, they are dead silent
Better reading.... (or allready on the champagne ??) ;)

Nevertheless, another nice piece of work! :up:


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