Aleph-X builder's thread.

[labjr]

I have some un-built boards. PM me if you're interested.

[homme_de_terre]

Hi labjr,

actually I am in the need of two boards. It seems that I am a little late for group orders and I also could not find any Gerber files so far.
I have even considered point-to-point wiring.
Anyway, I would happily buy the boards for two mono blocks.
Drop me an email, in case you cold help me out. This is my first post, so I can't email.

Manfred

[EUVL]

http://www.diyaudio.com/forums/showt...13#post1857313

Patrick

[Jason Hubbard]

I had my AX up & running OK using a variac to bring the voltage rails upto +/- 15v (this is the "standard" AX, 15v & 4.5A total quiescent current).

I switched to regulators - in order to drop the voltage from the 18v transformer windings, so after the dual bridge rectifiers i now have 100,000uf, followed by an LT1083 regulator followed by a further 100,000uf. The ouputs are then connected to give me split rails & it all works OK.

I have the following questions;

Does the current draw of the AX vary much - I.e. "most" class A amps are considered to have a constant current draw, but in reality the current varies between 0 and 2Iq - with the AX being symmetrical does this rule also apply or is the current draw pretty well constant?

Should i consider parallelling LT1083 regulators to provide more current capability - i am pulling 4.5 amps and the device is capable of supplying 7.5 amps - would an additional device on each rail be beneficial?

I currently have the reservoir capacitors either side of the regulator - should i revise the arrangement to perhaps have say only 20,000uf before the regulator and put the 200,000uf after the regulator?

[Luke]

Hi Jason, you should look at the datasheet. P=VI so work out how much they are dissipating, your well under the max current rating, but thats only half the story. I ssupect from what youve said one should suffice if its properly heatsinked.

[Jason Hubbard]

The power supply works just fine as it is and the device is operating well within manufacturers specs.

What i wanted to know was would an additional regulator give sonic benefits in that it would provide additional peak current capability if it were ever required? More to the point, will it ever be required? (i.e. will there be varying current requirements or does the symetrical nature of the amplifier pull a constant current?)

Are the capacitors best placed or would a different configuration yield better results?

[Luke]

The Aleph-x draws a constant current, so if its stable now its good to go.
Two regs will half the output impeadance of the psu so it may make an improvement, but I expect you would need to try it and see.

[commandercam]

Can anyone help me understand the difference between the Aleph X and Aleph J-X? I want to build a pair of mono-blocks based on the Aleph design. Also, it seems I am a few months late (at least) for getting in on a group buy. Are any group buys planed for the future or does anyone have unbuilt boards they would sell?

Thanks!
Cam

[Nelson Pass]

I believe the J-X basically replaces the input Mosfets with JFETs.

[scatterbrain001]

Hi, I am interested at this time in building an amplifier, I like yours , could you please tell me if there is any Printed Circuit Boards made, or if there has ever been an amplifier prototype made in your design, and what were the results

Thank You

scatterbrain001