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Old 23rd October 2005, 09:35 AM   #1
rmgvs is offline rmgvs  Netherlands
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Default mini-aleph versus aleph-3

Has someone experimented with the mini-aleph side-to-side with a pass aleph-3?

I wonder how the differences in sound quality can be described between these 2 same designs using one pair instead of two pairs of output transistors.

I guess there will be some extra smearing in the sound when using pairs parallel. But otherwise: why should super amps using 24 pairs or more in parallel sound so good?

Best is:
* using same components quality.
* using same idle current and voltages.
* judge within same power envelope (say first 10 watts)

Or in other words: when no more power than 10 Watts per channel is required (easy 8 ohm load with high sensitivity) would the mini-aleph always be a better option, not only theoretically but also tested in practice?
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Old 23rd October 2005, 10:56 AM   #2
joensd is offline joensd  Germany
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To say in terms of mr.layman : it depends.
For an 8ohm high-sensitive load IŽd personally go with higher voltage rails than that of the mini-a ->more power into 8ohms.
If that is too much power (dissipation) for your taste/needs you can always lower the bias (but you always have the option "pumping the jam" up)

greets
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Old 23rd October 2005, 12:08 PM   #3
Berry is offline Berry  Netherlands
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I build an aleph 5 (34V) and an aleph X (15v). The sound of the aleph 5 is more clear(voice), then the Aleph X. The Aleph X produce more depth (30 -50 HZ).

I like the Aleph 5 more

Berry
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Old 23rd October 2005, 12:27 PM   #4
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I have done just that!,

my amps are both an mini with a a30 front end <and> an a30 with an a3 output section. The Mini uses IRF150 +-17v and the a3 with irfp140+-23v, both with BrianGT boards (thanks Brian..very nice). They sound about the same to me in almost all respects. I will have to say that I like the mini better, for normal listening it sounds just a wee bit nicer on the Infinity Emits I'm using right now...smoother maybe? The a3 gives more level so its a toss up for me. If you had really efficient speakers I'd build a over-sinked mini with room to grow. Or build 'em both!

Marc

edit: i just reread your post. Sorry, my voltages are different and parts similar quality. I see no reason to use more devices on mini voltages and every reason to use more devices on a3 voltages, unless you want to run risk and can get rid of the heat.
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Old 23rd October 2005, 12:40 PM   #5
MikeW is offline MikeW  United States
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At lower levels they sound very much alike. It is the same circuit. The MOSFETs make only a very little difference (from irfp 244 to some fairchid HUF 515 watt monsters). I built 8 mini-A's and 3 A-3, A30 varients. I ran voltages from +/-12 to +/- 28 and 5 places in between. I changed the bias from 1 to 3.5 amps. I also played with the current source. That is what is nice about the Aleph, you can build it to suit your taste.

Afer all the testing I said to myself, Why am I doing this? Mr. Pass has done it before.
If you are going to build a mini-A let me know. I have some caps for the power suppy that came from Dale's moving sale.
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Old 23rd October 2005, 11:12 PM   #6
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Quote:
Originally posted by MikeW
I have some caps for the power suppy that came from Dale's moving sale.

Ouch Mike! That hurt!! ... well..not really.
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Old 24th October 2005, 12:14 AM   #7
MikeW is offline MikeW  United States
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Marc, do you want a couple?
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Old 4th February 2010, 03:18 PM   #8
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Default Mini_A VS A30

I've build both the mini A as well as the A30. The Mini_A has a great performance especially when you run the mosfets between 30 and 40W dissipation.

The A30 simply has a bit more punch and with my SEAS Thor speakers it display's more stability and ease.
I was planning to build the X600 for the Thor's, but the A30 sound so damn good that I never finnished the X600.

This is my A30:
A new A30 has started to sing!

I hope this helps
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