Aleph J is a smaller amp than A75 and you don't need 8 x 56k caps (half of that is more than enough). Also, find the caps that are rated 35V, they will be cheaper. As for all small resistors, use Dale CMF50, available from DigiKey, as their smaler footprint fits nicely on my boards: http://dkc3.digikey.com/PDF/C091/P1890.pdf
Good point Peter. I obviously haven't thought this through yet. With lower rail voltages I don't need caps rated at 50V, which would be cheaper. BTW is there an official schematic that coincides with your latest JX boards? I came across a couple on one of the threads here. Can't remember which one. With all the different discussions on design changes with each new GB wanna make sure I'm referring to the right one.
Dan
Dan
You will find the info on a working amp here: http://www.diyaudio.com/forums/pass-labs/145387-aleph-j-x-amp-project-27.html#post2012118
X front end schematic attached
X front end schematic attached
Attachments
No, Ian.
You need type 0 for Aleph-JX, type 1 or type 2 for B1.
http://www.diyaudio.com/forums/group-buys/135359-toshiba-dual-jfet-heatsink-5.html#post2121216
http://www.diyaudio.com/forums/pass-labs/145387-aleph-j-x-amp-project.html#post1851921
Patrick
.
You need type 0 for Aleph-JX, type 1 or type 2 for B1.
http://www.diyaudio.com/forums/group-buys/135359-toshiba-dual-jfet-heatsink-5.html#post2121216
http://www.diyaudio.com/forums/pass-labs/145387-aleph-j-x-amp-project.html#post1851921
Patrick
.
Last edited:
I've read through this thread from beginning to end looking for builder listening impressions comparing the standard J to the JX. The question was asked several times somewhere in the middle of this thread but noone answered. I'm in the planning stages of this build and am trying to decide whether to just do the standard J or the X version. If the X-ed version is worth the extra effort I'm leaning toward starting there. Things seemed to have quieted down but am hoping someone can offer up their impressions.
Dan
Dan
I originally started off to build a Aleph JX, but soon understood that it is way more complex to build than a Aleph J. I had then changed my mind and built a stock Aleph J and I am very happy with the outcome.
Compared to F5, Aleph J is difficult to build in my opinion, and then Aleph JX is more complex than J. If someone is attempting a Pass amp for the first time, then F5 is probably the right place to start.
My two cents.
Cheers.
Compared to F5, Aleph J is difficult to build in my opinion, and then Aleph JX is more complex than J. If someone is attempting a Pass amp for the first time, then F5 is probably the right place to start.
My two cents.
Cheers.
After rereading the last 20-30 posts on this thread I don't think I'm up to dedicating the time and effort to build the X version, regardless of performance. I've built plenty of gear before but only 1 amp...the A75...and that appears to have been a cakewalk compared to what others have experienced trying to do an X. Figure if I start with an X and it goes bad that'll be less time for listening and other projects. And the F5 looks like a great project also (anyone have any F5 boards for sale?). Too many projects and not enough time. I'll never run out of things to do when I retire.
Dan
Dan
I have no intentions of doing a JX. I find the X part too complex for me. Fundamentally there is no schematic for JX, other than the X frontend hand drawn by Peter Daniel and which also has some component values listed very subjectively and require some experimentation. My knowledge is not that deep to understand the circuit well enough and make the required changes.
Hi Everyone
I got all the main parts together for the ajx (exept for the 2sj109 or its equivalent) and worked out an easy prototype setup Richt now there are 1156 contributions to this forum but no report of a completely finished ajx or how this amp sounds.
Could someone report on this. I'm so curious ...
Regards René
I got all the main parts together for the ajx (exept for the 2sj109 or its equivalent) and worked out an easy prototype setup Richt now there are 1156 contributions to this forum but no report of a completely finished ajx or how this amp sounds.
Could someone report on this. I'm so curious ...
Regards René
I built 1 channel quite early on. Pretty straight forward I seem to remember and I'm not that skilled at all. Need to build the other channel sometime. Its always the case that takes the time for me. Ide get going and ask questions when you reach a problem.... I didnt listen to the 1 channel much as mono isnt my bag...
Dave
Dave
Patrick is the consummate experimenter, I'm just an experienced hacker.
If you like to tinker and have the test equipment and knowledge concerning how the Aleph circuitry works, I would say go for it!
Get the board set and build a SE Aleph first if you haven't done one previously, and dig in to it's workings. A few aspects of the Aleph amps are greatly compromised when you X two together.
I would not recommend it to someone merely trying to cobble something together as a first time or even second time project.
But that is just my opinion.
If you like to tinker and have the test equipment and knowledge concerning how the Aleph circuitry works, I would say go for it!
Get the board set and build a SE Aleph first if you haven't done one previously, and dig in to it's workings. A few aspects of the Aleph amps are greatly compromised when you X two together.
I would not recommend it to someone merely trying to cobble something together as a first time or even second time project.
But that is just my opinion.