damn!
Fugly!
even these two redundant holes at back
Thanks, it's great honour to receive ZM's Fugly comment.
The LuminAria actually have 2 inputs and 1 output and it's also on the PCB, that would use the remaining holes, but I'm too lazy to wire them up and just jumpered the connection 😛.
Dear Michael,
I tried 2SK60 for Luminaria circuit and it works, with doubled anode resistor and source resistor. I simply assumed that two 2SK60s work like one 2SK82, targeting at same Vds and Vgs and flowing around 30mA.
Compared to 2SK82 I built, I think with careful search on the operating point 2SK60 could be the good substitue. I do not have the ability to do so. I just feel sorry that Liminaria is not available any more due to shortage of 2SK82... 🙁
Maybe you tried this already?
Chul
I've tried the 2SK60 in a slightly different circuit. It has the advantage of lower capacitance. 🙂
That's what thought..
You already did. 🙂 Can you tell us about the circuit and the operating point you liked?
You already did. 🙂 Can you tell us about the circuit and the operating point you liked?
Just a preliminary bench test. I haven't spent enough time with it yet. Later this year, I think. 🙂
There are only 2 months left this year, maybe I should stock up some 2SK60 before you publish the circuit, cause demand for this SIT will definitely surge 🙂
nothing at all, o s...t!
I trying to finish my ongaku clone but
I am starting the CSX with two pairs of 82/28 in the version original that the master show at the beginning of the article of sony in common Source. I got four pairs matched of them. I will try, if not work I will make two stereo CSX1, with two SPMS. But now listening Bruckner the 4th with my old Yamaha with the old Mauhorns and Lowther EX4.
Now I am getting the real way...Jama friend is a developer and he found between the THF51 and the 180s recently got in Japan under the "D" sufix, the better in sound at all.
Anyway at the moment we not have the curves of the last JA and the 2SJ20/2SK70 you sent. A soon we got they I will communicate to you my friend
I trying to finish my ongaku clone but
I am starting the CSX with two pairs of 82/28 in the version original that the master show at the beginning of the article of sony in common Source. I got four pairs matched of them. I will try, if not work I will make two stereo CSX1, with two SPMS. But now listening Bruckner the 4th with my old Yamaha with the old Mauhorns and Lowther EX4.
Now I am getting the real way...Jama friend is a developer and he found between the THF51 and the 180s recently got in Japan under the "D" sufix, the better in sound at all.
Anyway at the moment we not have the curves of the last JA and the 2SJ20/2SK70 you sent. A soon we got they I will communicate to you my friend
Thanks Walter for your kind words, I just stuffed the boards into a USD60 factory made chassis from TB, I hope I can build something close to the quality of your CSX-1 monoblock one day 🙂
Good luck in your search for matched 2SK82s.
Good luck in your search for matched 2SK82s.
Thanks!
The 2SK82 has become a real unobtanium, just like the 2SK77.
In the swap section I tried to swap my precious Toshiba 2SJ74BL's for 2SK82, but not one single reaction.
The 2SK82 has become a real unobtanium, just like the 2SK77.
In the swap section I tried to swap my precious Toshiba 2SJ74BL's for 2SK82, but not one single reaction.
... I will do a PCB for 2SK60. Starts could be next week...
I´ve the ax article from Mr. Rothacher.
Jean-Paul
I´ve the ax article from Mr. Rothacher.
Jean-Paul
You can definitely do a common source amp with P-channel SITs, after that whether the 2SJ28 will give similar gain or linearity as the 2SK82 remains to be seen. LuminAria exploits a characteristic of the 2SK82 in an unconventional way.
Maybe Michael has tested that already, but you can also follow the method described in the article to measure the curves yourself (well, reverse the polarity ... etc)
Maybe Michael has tested that already, but you can also follow the method described in the article to measure the curves yourself (well, reverse the polarity ... etc)
... then I would ask officially Mr. Rothacher?
Even if it´s only a sketch. 2SJ28 is still available...
Even if it´s only a sketch. 2SJ28 is still available...
I'm sure the J28 would work. Conceptually, you'd just change all the pluses to minuses and vice versa. Practically, a little experimentation would be needed to find the sweet spot. Fixed bias would make that easier.
Hi,
For those forum members who received my gerbers and schematic for the LuminAria, I just noticed that I made a mistake in the schematic.
The MOSFET for the DC supply should be an IRF610 (instead of IRF510), the IRF610 is rated for 200V and shown in the original AudioXpress article, IRF510 is rated for 100V only (I'm using 610 in my build, just somehow I made a typo in the Kicad schematic) and not appropriate.
Sorry to those who're troubled by this 😱
For those forum members who received my gerbers and schematic for the LuminAria, I just noticed that I made a mistake in the schematic.
The MOSFET for the DC supply should be an IRF610 (instead of IRF510), the IRF610 is rated for 200V and shown in the original AudioXpress article, IRF510 is rated for 100V only (I'm using 610 in my build, just somehow I made a typo in the Kicad schematic) and not appropriate.
Sorry to those who're troubled by this 😱