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Old 8th April 2009, 02:39 AM   #11
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Join Date: May 2008
Thanks Graeme!


here is a photo showing layout. Im sure its causing the problems with offset as the back heatsink heats up more than the rest.

Well with these comments of the changes of the X100 to XJ100 im surprised more people have not done the conversion!
now to get some 2sj74 or 27j109

Cheers
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Old 8th April 2009, 08:46 PM   #12
gl is offline gl  United States
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Hi Dan,

A very nice job indeed.

Graeme
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Old 9th April 2009, 08:50 AM   #13
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Well here are the changes.

changes to R46, R47 from 2.2k to 22.2k
changes to R16, R30 from 221 to 221k

removing the 10pf caps

and of course included Jfets

How does it all look to you folks?

Cheers
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Old 9th April 2009, 06:57 PM   #14
gl is offline gl  United States
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Hi Dan,

Your schematic appears to be based on one from KK's website. I have never seen any evidence that KK actually built and/or tested any of the circuitry that he puts up on his site.

The Aleph-X is a minimalist circuit. Changing almost any component in the signal path will have some effect on the sound. I would really really strongly recommend that you start with a proven implementation, get that running as published, THEN start to modify things to your own taste or requirements.

The GRollins/Hifizen version is the default standard. The AX100/AX100J has been successfully built by macka and daly41k as well as by me. If I was the only one who had built it I wouldn't have the courage to recommend it. There are also several other experienced, long-time members who have built versions of the original and published their results.

As a practical matter, by the way, it is very difficult to comment on a schematic that has no part designators (such as R1, R2, etc).

Cheers,
Graeme
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Old 9th April 2009, 08:33 PM   #15
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Hello Graeme

I modified kks to be a copy of the one Macka posted or was it yourself. The only real difference is the output stage, having 3 output parallel Fets instead of the 5 which was shown on the schmatic. As far as KKs design all I can say he has expensive boards.

Thanks for your comments
Cheers
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Old 17th April 2009, 10:14 AM   #16
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Join Date: Jul 2005
Location: East Sussex
Hi.
Just to say, I have a pair of KK’s AX boards (the only higher power AX types I could find) and will probably try to modify these to ‘J’ type (are these among the mods required to take an AX to .5 status ?) . I have built an Aleph 5 using his boards which has worked out well, and if people look at the PassLabs Diy site under gallery, misc amps, and others you will see many examples (not mine yet!) of his boards being used. People seem happy with the results. I would say that, though not the cheapest boards, they are readily available, well documented and his assistance with questions has been very good. They have allowed a novice to upgrade from Denon POA 4400 and learn a lot while doing it. Without his boards I would not have had a ‘Doorway to Pass Heaven’.
Next on the list is a Pass F5 using CViller’s boards. (see below)
Regards.
(When I learn how to post images!!)
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Old 23rd April 2009, 08:36 AM   #17
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Hello jotom750
Just wondering if ya tried those Jfets yet.

Im still in the stage of finding some fets
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Old 23rd April 2009, 05:09 PM   #18
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Location: East Sussex
Hi Dan.
Sorry to say I haven’t, next on my list is an F5, then Aleph P1.7. I have AX high power boards (KK’s) but wanted to see what was required to mod them (hopefully to .5 status).
I find most of my parts on EBay. Had good luck so far, some very good U.S. (shipping never a problem) and U.K. suppliers. What are you short of ?
All the best.
Jotom750
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Old 23rd April 2009, 05:59 PM   #19
Jozua is offline Jozua  South Africa
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Location: Cape Town
Default Looking for the latest version PCB

Hi

I am looking for the latest set of PCB's for the Aleph X amp.

Please contact me if any f you guys have a set to sell. I have the version 1 boards (green) and I am looking for the "red" version.


Jozua
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Old 5th May 2009, 09:06 AM   #20
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Hello jotom

still trying to source the 2SJ74's, although Mr Pass has recommended another jfet, which I understand is about to be released.

Cheers
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