I also found Mike to be very nice to deal with.
I would like to know where to get those drop in bases for the SemiSouth pieces I bought years ago. It would be fun to try them in my Magnavox 6V6 amp! ⚡ ⚡⚡
I just received a batch from the last revision of the board from Rainfallsky V1.21. I have four sets to spare if you are interested. They look great. Classic Aleph J schematic but with one pair of output transistors only. I’m building it with the sjep jfet just like you want to do. Pm me if you want a pair, I will sell those at my cost plus shipping.
Hubert
Hubert
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@TA, these pcb's were done by member RainfallSky and I think they are in the long FirstWatt J2 thread. He did about 3 versions and from memory he posted the gerbers.
Board gerbers here-
https://www.diyaudio.com/community/threads/semisouth-aleph-j.176857/post-6621026
https://www.diyaudio.com/community/threads/semisouth-aleph-j.176857/post-6621026
This is not the last revision. I have reach out to Rainfallsky to know if he want to share the last revision of his board with everyone.
Yeh, the Aleph J with Semisouth thread - the latest Rev2 gerbers are in post #291 and his BOM is in post #360 of that thread in 2021. The schematic is in post #349.
The board shown here above in post #23 might be a later version, seeing it has 2024 silkscreened on it.
The board shown here above in post #23 might be a later version, seeing it has 2024 silkscreened on it.
The rev 2 from Rainfallsky is not the classic Aleph J but a kinda Aleph J output with a J2 input. Rev 1.xx is the aleph J with one pair of output.
Yes the 1.21 is the last iteration from 2024 of the Aleph J topology
Yes the 1.21 is the last iteration from 2024 of the Aleph J topology
If someone want a set of the board design from Rainfallsky I’ve just put up an ad in the swap meet section.
https://www.diyaudio.com/community/threads/aleph-j-pcb-sets.408196/
Hubert
https://www.diyaudio.com/community/threads/aleph-j-pcb-sets.408196/
Hubert
Hi Everyone!
Here is the latest revision of V1. It's an open project. 🙂
R0 is a jumper. Use neat looking zero Ohm resistor or a wire. But not a bare wire, or at least it need some spacing. That Greek pattern is conductive.
Here is the latest revision of V1. It's an open project. 🙂
R0 is a jumper. Use neat looking zero Ohm resistor or a wire. But not a bare wire, or at least it need some spacing. That Greek pattern is conductive.
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I will add..
R24 on schematic and HBR on the boards is the only place where Power GND is connected with Input GND.
It should be either jumpered for Balanced input or used as Hum Breaking Resistor (10 Ohm) for Unbalanced input.
I should have left it as R24 on the board but hum breaking resistor was on my mind at that moment.
Well V1.22 it would be if you find it important.
JP on the board should be jumpered for Unbalanced input too. And not jumpered for Balanced input.
I hope it doesn't sound too complicated..
R24 on schematic and HBR on the boards is the only place where Power GND is connected with Input GND.
It should be either jumpered for Balanced input or used as Hum Breaking Resistor (10 Ohm) for Unbalanced input.
I should have left it as R24 on the board but hum breaking resistor was on my mind at that moment.
Well V1.22 it would be if you find it important.
JP on the board should be jumpered for Unbalanced input too. And not jumpered for Balanced input.
I hope it doesn't sound too complicated..
Thank you for the explanation. This clears any confusion we might have had.
The Aleph J PCBs from the store required an external wire to connect -IN to GND for unbalanced input. This way is cleaner.
The Aleph J PCBs from the store required an external wire to connect -IN to GND for unbalanced input. This way is cleaner.
Maybe someone can explain.
How is AlephJ SS superior to the J2 ?
Both have modulated current source.
Patrick
How is AlephJ SS superior to the J2 ?
Both have modulated current source.
Patrick