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Old 15th August 2003, 04:27 AM   #1
diyAudio Member
Join Date: Aug 2003
Location: Taipei
Default What's the difference between original aleph2 and DIY aleph2?

Hi, I am a new one here. There are some questions in my mind.

What's the difference between original aleph2(from Pass Lab ) and DIY aleph2?

For example, as I know,there are 24 mos in aleph 0 of Pass Lab,and we only use 12(half of the number) in DIY works. Would that be dangerous after a long time of using?Maybe unlike original machines,our DIY work will be out of order after 3 or 4 years.

I've finished my DIY aleph2(You can see as below)


My speaker system is B&W M801s3,and aleph 2 seems not to be able to controll the speaker well. I am wondering whether aleph 0 would be better.
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Old 15th August 2003, 09:48 AM   #2
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Join Date: Aug 2001
Location: Ingolstadt Germany
Hi Chris,

if youŽve build your Aleph2 like the original there shouldnŽt be any difference except for the parts youŽve used. (most DIYers tend to choose "better" parts than were in the original amp).

The expected lifespan depends on your personal choise how hot youŽll let it run and can be longer or shorter than the original.....

Did you use 12fets per channel and what bias are you running? For a bit more "control" you could up the ac-current-gain to 60% or so.

een ooievaar is geen konijn want zijn oren zijn te klein!
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Old 16th August 2003, 11:40 AM   #3
diyAudio Member
Join Date: Aug 2003
Location: Taipei
Dear William

I use 12 FETs(per channel)in my Aleph 2.

I'm wondering the difference because I've a friend who ever exanined the original Aleph2. And he told me about the differences. Because I can't prove if it is true, I hope maybe someone here can tell me more about this, and give some advice to improve my DIY aleph2.

Anyway,much appreciated of your opinions.


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Old 17th August 2003, 09:03 PM   #4
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
As far as I know, the DIY Aleph 2 is based solely on the
schematic of the original, which did not change over the
product life. It has a total of 12 TO-3 output devices.
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