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First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions
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Old 12th August 2009, 06:51 AM   #11
tiefbassuebertr is offline tiefbassuebertr  Germany
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You are right. But I don't know the reason, why the forum destroy both addresses.

Please try follow:
1) copy one the follow addresses in your web address field


vidar.hallais.no/media/download_gallery/Aleph%200%20(75w).pdf
vidar.hallais.no/media/download_gallery/Aleph%200s%20(40w).pdf

2) add " http:// "

Sorry - I am not a expert for computer and web requirements - so I don't find a better way
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Old 27th August 2009, 02:42 PM   #12
tiefbassuebertr is offline tiefbassuebertr  Germany
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After finished update of "DIYAUDIO" server I will see, what now happen about the "Aleph 0" weblinks for pdf service manual:

http://vidar.hallais.no/media/downlo...00%20(75w).pdf
http://vidar.hallais.no/media/downlo...0s%20(40w).pdf
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Old 26th April 2012, 02:11 PM   #13
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by tiefbassuebertr View Post
After finished update of "DIYAUDIO" server I will see, what now happen about the "Aleph 0" weblinks for pdf service manual:

http://vidar.hallais.no/media/downlo...00%20(75w).pdf
http://vidar.hallais.no/media/downlo...0s%20(40w).pdf
Links are all death.
about
PassLabs Aleph0 rev4.6 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics
is to download the schema
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Old 27th April 2012, 02:13 AM   #14
PKI is offline PKI  United States
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First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions
After reading about Aleph's 0 i have a question: is it possible to find a pcb set for it? :-)
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Old 25th July 2015, 12:03 PM   #15
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by Nelson Pass View Post
There are a number of practical differences.

The Aleph 0 will drive low impedance loads without a grunt. You
can overlay the distortion vs power curves for 8, 4, and 2 ohms
and they are the same curve.

It also measures lower distortion vs power, distortion vs frequency
and has a higher damping factor.

The later Alephs have only two stages, and lower feedback. The
measured performance is not as good, but they have a charming
characteristic into many of the more efficient loudspeakers.
They
also have no adjustments, and cannot be blown up.

The Aleph 0 is not easy to damage, either, but we did lose a couple
of Aleph 0s units into dead shorts over the history of that amp.

in listening tests it became repeatedly confirmed, that additional output power buffer stages (emitter/source follower) sounds more clean and tight, particularly in the lower frequency range (below approximately 300 Hz), but without buffer stage (i.e. VAS-stage designed as power stage) the amp device provides a more charming sound characteristic into most of the speakers, not only the higher efficient loudspeakers.

This is even to observe by compare the single ended Power Follower from Andrea Ciuffoli against the ZEN from your development, although not as significantly as in a complementary power follower stage (was checked without additional active line stages/gain stages, which produce always more or less additional THD components).

Are there concepts in the meantime, where it is possible to select both sonic characters by use of a switch or reposition of a coding plug (both diy projects and commercial amp devices) ?
Thank you for your information.

Last edited by tiefbassuebertr; 25th July 2015 at 12:12 PM.
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Old 27th July 2015, 04:25 PM   #16
norb is offline norb  Germany
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The F5 allows adjustment of distortion characteristics by means of pot P3 (see article F5Turbo), this could be changed to a resistors + switch arrangement.

The A75 has two means of changing sonic characterics, which could also be modified to resistors + switch:
- setpoint of folded cascode operation of the front end
- amount and ratio of feedback from front end and/or amplifier (power) output

I fiddled with these after completing my A75, and the sonic impression could be changed quite a bit, i especially remember getting very mellow and warm reproduction of vocals / classical music with one configuration, but can´t recall the exact setup.

Greetings / schönen Tag noch
Norb
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Old 7th April 2017, 10:33 PM   #17
pdyn is offline pdyn  Poland
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some questions
- who have old stereophile article about Aleph 0 ?
- what kind of loudspeakers/models are good/you prefer for this amp ?
- when I turn off my Aleph 0s i hear short but loud "pop" is this normal ?
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Old 2nd May 2017, 10:19 AM   #18
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by pdyn View Post
some questions
- who have old stereophile article about Aleph 0 ?
From one of the later Aleph versions I have discover this review:
Pass Aleph 1.2 monoblock power amplifier | Stereophile.com
This I also want to have from the Aleph 0.
Thanks for advices.
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Old 2nd May 2017, 01:44 PM   #19
Darry is offline Darry  France
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There, old stereophile article about Aleph 0
Attached Files
File Type: pdf A0 review stereophile.pdf (510.2 KB, 192 views)
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Old 2nd May 2017, 05:24 PM   #20
Zen Mod is offline Zen Mod  Serbia
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First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions
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File Type: jpg amp of the decade.jpg (56.7 KB, 366 views)
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