Aleph 3 , Alehp-X

[Angel Puerto]

Hello,

I have a DIY Aleph 3 and I am happy. A friend doubts among building an Aleph 3 or an Aleph-X, me known not to respond him.



That you differ do they exist in listens to it?
That power gives this circuit?

http://web.vip.hr/pcb-design.vip/alephx.html

Ángel

 

[ctong]

Angel,

How much of a DC offset do you have at the speaker terminals? Thanks.

 

[cowanrg]

i think he's asking which amp should his friend build, and aleph3 or an alephx...

i think.

 

[wuffwaff]

Angel,

building the X is a bit more difficult tham building the aleph 3 but I think it is worth it.
There are a few descriptions of the difference in sound between X and Alephon the forum. Here are two I found but there must be more:

http://www.diyaudio.com/forums/showthread.php?postid=591051#post591051

http://www.diyaudio.com/forums/showthread.php?postid=645248#post645248

William

 

[cowanrg]

keep in mind that an aleph x is more speaker dependant, right?

i was going to build one, until i learned that its not really good to pair it with 4 ohm lower efficiency speakers. so, it depends on how you plan to use it as well.

 

[kilowattski]

Robert,

Thats not true, the Aleph X with some component mods can handle 4 ohms nicely although not with alot of headroom.

 

[metalman]

I agree with kilowattski. The Aleph-X can be customized to suit almost any impedance load. It depends mostly on the number of ouput devices used and the bias current level, although most of us have chosen to optimize our Aleph-X's for operation into 4-8 ohm loads.

 

[wuffwaff]

in fact all of the things that must be watched (concerning power into different loads) when building an Aleph also have to be watched when building an X.

In both you can set 3 things:

1. Power Supply Voltage
2. Bias
3. Ac-Current-Gain

With these you can make everything you want (as long as your heatsinks are big enough). For the same power output even the dissipation will be equal between X and Aleph.

William

 

[Angel Puerto]

Hello,

We have proven the Aleph 3, the one has some speakers complicated DIY for this stage.

About 60 W would be needed in class A, and maybe a more universal amplifier.

Thank you for their comments.


Angel.

 

[JC Fardo]

Hello Angel

60W class A => Aleph 5

Universal class => AKSA or Elektor Milenium SE

Saludos

JC

 

[Angel Puerto]

Hello,

For an universal amplifier of about 60w - 70 w in class TO my the suggestion that I gave him was:

I built a friend and it manages any speaker very well. You go on sure.

http://www.borbelyaudio.com/eb2000342.asp

Ángel

 

[GRollins]

I'm always amused and amazed by how these rumors get started. Either the Aleph or the Aleph-X will do just fine with low-Z loads, assuming sufficient bias.
When I first started the original thread on the Mini-A, just about the first thing people asked was whether it would handle a 4 ohm load. In that case, no, I had not provided enough bias for 4 ohms, although increasing the bias is a pretty simple operation. So when I did the Aleph-X I made sure to boost the current so that it would (almost) handle 4 ohms. If you want more bias still, have at it. Just make sure that you have a robust power supply.

Grey

 

[cowanrg]

i was just speculating, thats all...

as i recall (which could be incorrect), you can make an alephx that can be well suited for 4 ohm loads, but it would be HIGHLY inefficient and produce massive amounts of heat and have a very robust power supply. i just remember its better suited with 8 ohm loads.

just about any amp can be customized to work at different load ratings, some are just more suited for different applications.

im glad you are amused.

 

[GRollins]

Any amp biased heavily enough for a low-Z load is going to be less efficient, regardless of topology, gain devices, etc. The lower the load impedance, the higher the bias required, and the greater the heat generated at idle. If it's not used to produce sound, it goes up as heat, making the amp inefficient. You can't beat physics. All you can do is back off and go class AB or D or something, but then you're changing the rules of the game.

Grey

 

[ctong]

An amp becomes inefficient if you want to be able to drive both low and high impedence loads. The efficiencies for low impedence loads can be improved by reducing the rail voltage, but the amp will not be have enough voltage to drive high impedence loads.